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228 relations: A-type main-sequence star, Accretion disk, Active galactic nucleus, Albert Einstein, Algol variable, Alpha Serpentis, Alpha2 Canum Venaticorum variable, Am star, American Association of Variable Star Observers, Ancient Greek, Angular distance, Ap and Bp stars, Apparent magnitude, Aquila (constellation), Arp 220, Asclepius, Asterism (astronomy), Axion, Babylonian astronomy, Barium star, Barred spiral galaxy, Bayer designation, Be star, Beta Cephei variable, Beta Lyrae variable, Beta Serpentis, Binary star, BL Lacertae object, Blazar, Blue giant, Blue straggler, Blue supergiant star, Boötes, Bok globule, Brown dwarf, Brown-dwarf desert, Carbon, Chi Serpentis, Chinese astronomy, Chinese constellations, Circumstellar disc, Common envelope, Constellation, Constellation family, Corona Borealis, Crown prince, Dark nebula, Declination, Deep-sky object, Degenerate matter, ..., Delta Scuti variable, Delta Serpentis, Double periodic variable, Dust lane, Eagle Nebula, Eddington luminosity, Electronvolt, Elliptical galaxy, Epsilon Serpentis, Equation of state, Equatorial coordinate system, Eta Serpentis, Eudoxus of Cnidus, Eugène Joseph Delporte, Evaporating gaseous globule, Exoplanet, FH Serpentis, Forbidden mechanism, FS Canis Majoris variable, Galactic Disc, Galactic halo, Galactic plane, Galaxy cluster, Galaxy group, Galaxy merger, Gamma ray, Gamma Serpentis, Gamma-ray burst, General relativity, Giant star, Globular cluster, Gravitational lens, Greek mythology, H II region, Herbig Ae/Be star, Hercules, Hercules (constellation), Hoag's Object, Horned Serpent, Hubble Space Telescope, Hydra (constellation), Hydrogen, IC 4756, Interacting galaxy, International Astronomical Union, Iota Serpentis, Iron peak, Irregular variable, Johann Bayer, Jupiter, Kappa Serpentis, Kelvin, Kerr metric, L183, Lambda Boötis star, Lambda Serpentis, Libra (constellation), Light-year, List of stars in Serpens, Lists of constellations, Lithium, Low-ionization nuclear emission-line region, Luminous infrared galaxy, Magnetic moment, Manganese, Mercury (element), Messier 5, Meteor shower, Millisecond pulsar, Minute and second of arc, Mira variable, Molecular cloud, Mu Serpentis, NASA/IPAC Extragalactic Database, Nebula, Neutron star, NGC 5921, NGC 5962, NGC 5964, NGC 6118, NGC 6535, NGC 6604, Ningishzida, Nitrogen, NN Serpentis, Northern Hemisphere, Nu Serpentis, O-type star, OB star, Omega Serpentis, Omicron Serpentis, Ophiuchus, Orion variable, Oxygen, P Cygni, Palomar 5, Photoevaporation, Pi Serpentis, Pillars of Creation, Planetary nebula, Popular Astronomy (US magazine), Proper motion, Protostar, Psi Serpentis, Ptolemy, Pulsar, Pulsar wind nebula, R Serpentis, Radiant (meteor shower), Radio galaxy, Radio wave, Rain, Red dwarf, Red giant, Red Rectangle Nebula, Red Square Nebula, Redshift, Right ascension, Ring galaxy, RR Lyrae variable, Sagittarius (constellation), Scutum (constellation), Serpens South, Seyfert galaxy, Seyfert's Sextet, Sh2-54, Shilou County, Silicon, SIMBAD, Slowly pulsating B-type star, SN 1987A, Snake, Solar analog, Solar-like oscillations, Spectral line, Spiral galaxy, Spitzer Space Telescope, Square degree, Star formation, Stellar classification, Stellar kinematics, Stellar wind, Stellar-wind bubble, Strontium, Students for the Exploration and Development of Space, Subgiant, Supermassive black hole, Supernova, Symbiotic nova, Synchrotron radiation, Tau4 Serpentis, Theta Serpentis, Tidal tail, Type II supernova, Type-cD galaxy, Ultraviolet, Variable nebula, Variable star, Virgo (constellation), W Serpentis, Way of the Celestial Masters, Westerhout 40, White dwarf, Wolf–Rayet star, X-ray, X-ray binary, X-ray spectroscopy, Xi Serpentis, Zeta Serpentis, 16 Serpentis, 25 Serpentis, 36 Serpentis, 3C 321, 5 Serpentis, 59 Serpentis, 80th parallel north, 80th parallel south, 88 modern constellations. Expand index (178 more) »
A-type main-sequence star
An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen-burning) star of spectral type A and luminosity class V. These stars have spectra which are defined by strong hydrogen Balmer absorption lines.
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Accretion disk
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
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Active galactic nucleus
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion—and possibly all—of the electromagnetic spectrum, with characteristics indicating that the excess luminosity is not produced by stars.
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Albert Einstein
Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).
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Algol variable
Algol variables or Algol-type binaries are a class of eclipsing binary stars that are related to the prototype member of this class, β Persei (Beta Persei, Algol) from an evolutionary point of view.
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Alpha Serpentis
Alpha Serpentis (α Serpentis, abbreviated Alpha Ser, α Ser), also named Unukalhai, is a double star in the head (Serpens Caput) of the equatorial constellation of Serpens.
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Alpha2 Canum Venaticorum variable
An Alpha2 Canum Venaticorum variable (or α2 CVn variable) is a type of variable star.
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Am star
An Am star or metallic-line star is a type of chemically peculiar star of spectral type A whose spectrum has strong and often variable absorption lines of metals such as zinc, strontium, zirconium, and barium, and deficiencies of others, such as calcium and scandium.
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American Association of Variable Star Observers
Since its founding in 1911, the American Association of Variable Star Observers (AAVSO) has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and educators.
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Ancient Greek
The Ancient Greek language includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD.
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Angular distance
In mathematics (in particular geometry and trigonometry) and all natural sciences (e.g. astronomy and geophysics), the angular distance (angular separation, apparent distance, or apparent separation) between two point objects, as viewed from a location different from either of these objects, is the angle of length between the two directions originating from the observer and pointing toward these two objects.
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Ap and Bp stars
Ap and Bp stars are chemically peculiar stars (hence the "p") of types A and B which show overabundances of some metals, such as strontium, chromium and europium.
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Apparent magnitude
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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Aquila (constellation)
Aquila is a constellation on the celestial equator.
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Arp 220
Arp 220 is the result of a collision between two galaxies which are now in the process of merging.
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Asclepius
Asclepius (Ἀσκληπιός, Asklēpiós; Aesculapius) was a hero and god of medicine in ancient Greek religion and mythology.
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Asterism (astronomy)
In observational astronomy, an asterism is a popular known pattern or group of stars that are recognised in the night sky.
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Axion
The axion is a hypothetical elementary particle postulated by the Peccei–Quinn theory in 1977 to resolve the strong CP problem in quantum chromodynamics (QCD).
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Babylonian astronomy
The history of astronomy in Mesopotamia, and the world, begins with the Sumerians who developed the earliest writing system—known as cuneiform—around 3500–3200 BC.
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Barium star
Barium stars are spectral class G to K giants, whose spectra indicate an overabundance of s-process elements by the presence of singly ionized barium, Ba II, at λ 455.4 nm.
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Barred spiral galaxy
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars.
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Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
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Be star
Be Stars are a heterogeneous set of stars with B spectral types and emission lines.
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Beta Cephei variable
Beta Cephei variables, also known as Beta Canis Majoris stars, are variable stars that exhibit small rapid variations in their brightness due to pulsations of the stars' surfaces, thought due to the unusual properties of iron at temperatures of 200,000 K in their interiors.
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Beta Lyrae variable
Beta Lyrae variables are a class of close binary stars.
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Beta Serpentis
Beta Serpentis, Latinized from β Serpentis, is a binary star system in the constellation Serpens, in its head (Serpens Caput).
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Binary star
A binary star is a star system consisting of two stars orbiting around their common barycenter.
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BL Lacertae object
A BL Lacertae object or BL Lac object is a type of galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae.
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Blazar
A blazar is a very compact quasar (quasi-stellar radio source) associated with a presumed supermassive black hole at the center of an active, giant elliptical galaxy.
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Blue giant
In astronomy, a blue giant is a hot star with a luminosity class of III (giant) or II (bright giant).
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Blue straggler
A blue straggler is a main-sequence star in an open or globular cluster that is more luminous and bluer than stars at the main-sequence turn-off point for the cluster.
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Blue supergiant star
Blue supergiant stars are hot luminous stars, referred to scientifically as OB supergiants.
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Boötes
Boötes is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere.
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Bok globule
In astronomy, Bok globules are isolated and relatively small dark nebulae, containing dense cosmic dust and gas from which star formation may take place.
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Brown dwarf
Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars, having masses between approximately 13 to 75–80 times that of Jupiter, or approximately to about.
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Brown-dwarf desert
The brown-dwarf desert is a theorized range of orbits around a star on which brown dwarfs cannot exist as a companion object.
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Carbon
Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
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Chi Serpentis
Chi Serpentis (χ Ser, χ Serpentis) is a solitary star in the Serpens Caput section of the equatorial constellation Serpens.
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Chinese astronomy
Astronomy in China has a long history, beginning from the Shang Dynasty (Chinese Bronze Age).
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Chinese constellations
Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese xīng guān).
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Circumstellar disc
A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accumulation of matter composed of gas, dust, planetesimals, asteroids or collision fragments in orbit around a star.
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Common envelope
In astronomy, a common envelope (CE) is gas that contains a binary star system.
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Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Constellation family
Constellation families are collections of constellations sharing some defining characteristic, such as proximity on the celestial sphere, common historical origin, or common mythological theme.
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Corona Borealis
Corona Borealis is a small constellation in the Northern Celestial Hemisphere.
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Crown prince
A crown prince is the male heir apparent to the throne in a royal or imperial monarchy.
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Dark nebula
A dark nebula or absorption nebula is a type of interstellar cloud that is so dense that it obscures the light from objects behind it, such as background stars and emission or reflection nebulae.
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Declination
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
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Deep-sky object
Deep-sky object (abbreviated as DSO) is a term designating any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc.). The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters, nebulae and galaxies.
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Degenerate matter
Degenerate matter is a highly dense state of matter in which particles must occupy high states of kinetic energy in order to satisfy the Pauli exclusion principle.
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Delta Scuti variable
A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface.
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Delta Serpentis
Delta Serpentis (δ Serpentis, δ Ser) is a star system in the constellation Serpens, in its head (Serpens Caput).
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Double periodic variable
A Double Periodic Variable (DPV) is a type of binary star.
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Dust lane
A dust lane is a relatively dense obscuring band of interstellar dust, observed as a dark swath against the background of a brighter object, especially a galaxy.
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Eagle Nebula
The Eagle Nebula (catalogued as Messier 16 or M16, and as NGC 6611, and also known as the Star Queen Nebula and The Spire) is a young open cluster of stars in the constellation Serpens, discovered by Jean-Philippe de Chéseaux in 1745–46.
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Eddington luminosity
The Eddington luminosity, also referred to as the Eddington limit, is the maximum luminosity a body (such as a star) can achieve when there is balance between the force of radiation acting outward and the gravitational force acting inward.
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Electronvolt
In physics, the electronvolt (symbol eV, also written electron-volt and electron volt) is a unit of energy equal to approximately joules (symbol J).
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Elliptical galaxy
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.
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Epsilon Serpentis
Epsilon Serpentis, Latinized from ε Serpentis, is a single, white-hued star in the constellation Serpens, in its head (Serpens Caput).
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Equation of state
In physics and thermodynamics, an equation of state is a thermodynamic equation relating state variables which describe the state of matter under a given set of physical conditions, such as pressure, volume, temperature (PVT), or internal energy.
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Equatorial coordinate system
The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects.
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Eta Serpentis
Eta Serpentis (η Ser, η Serpentis) is a star in the constellation Serpens.
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Eudoxus of Cnidus
Eudoxus of Cnidus (Εὔδοξος ὁ Κνίδιος, Eúdoxos ho Knídios) was an ancient Greek astronomer, mathematician, scholar, and student of Archytas and Plato.
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Eugène Joseph Delporte
Eugène Joseph Delporte (10 January 1882 – 19 October 1955) was a Belgian astronomer born in Genappe.
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Evaporating gaseous globule
An evaporating gas globule or EGG is a region of hydrogen gas in outer space approximately 100 astronomical units in size, such that gases shaded by it are shielded from ionizing UV rays.
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Exoplanet
An exoplanet or extrasolar planet is a planet outside our solar system.
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FH Serpentis
FH Serpentis (Nova Serpentis 1970) was a nova, which appeared in the constellation Serpens in 1970.
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Forbidden mechanism
In spectroscopy, a forbidden mechanism (forbidden transition or forbidden line) is a spectral line associated with absorption or emission of light by atomic nuclei, atoms, or molecules which undergo a transition that is not allowed by a particular selection rule but is allowed if the approximation associated with that rule is not made.
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FS Canis Majoris variable
An FS Canis Majoris variable is a type of eruptive variable star.
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Galactic Disc
The Galactic Disc is a component of disc galaxies, such as spiral galaxies and lenticular galaxies.
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Galactic halo
A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component.
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Galactic plane
The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies.
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Galaxy cluster
A galaxy cluster, or cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity with typical masses ranging from 1014–1015 solar masses.
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Galaxy group
A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 1010 times the luminosity of the Sun); collections of galaxies larger than groups that are first-order clustering are called galaxy clusters.
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Galaxy merger
Galaxy mergers can occur when two (or more) galaxies collide.
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Gamma ray
A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.
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Gamma Serpentis
Gamma Serpentis (γ Serpentis, γ Ser) is a star in the equatorial constellation Serpens, in the part of the constellation that represents the serpent's head (Serpens Caput).
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Gamma-ray burst
In gamma-ray astronomy, gamma-ray bursts (GRBs) are extremely energetic explosions that have been observed in distant galaxies.
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General relativity
General relativity (GR, also known as the general theory of relativity or GTR) is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics.
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Giant star
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
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Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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Gravitational lens
A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.
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Greek mythology
Greek mythology is the body of myths and teachings that belong to the ancient Greeks, concerning their gods and heroes, the nature of the world, and the origins and significance of their own cult and ritual practices.
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H II region
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized.
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Herbig Ae/Be star
A Herbig Ae/Be star (HAeBe) is a pre-main-sequence star – a young (V. Mannings & A. Sargent (2000) High-resolution studies of gas and dust around young intermediate-mass stars: II. observations of an additional sample of Herbig Ae/Be systems. Astrophysical Journal, vol. 529, p. 391 Hydrogen and calcium emission lines are observed in their spectra. They are 2-8 Solar mass objects, still existing in the star formation (gravitational contraction) stage and approaching the main sequence (i.e. they are not burning hydrogen in their center). In the Hertzsprung–Russell diagram these stars are located to the right of the main sequence. They are named after the American astronomer George Herbig, who first distinguished them from other stars in 1960. The original Herbig criteria were.
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Hercules
Hercules is a Roman hero and god.
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Hercules (constellation)
Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.
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Hoag's Object
Hoag's Object is a non-typical galaxy of the type known as a ring galaxy.
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Horned Serpent
The Horned Serpent appears in the mythologies of many Native Americans.
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Hubble Space Telescope
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
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Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees.
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Hydrogen
Hydrogen is a chemical element with symbol H and atomic number 1.
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IC 4756
IC 4756 is an open cluster in the Serpens constellation.
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Interacting galaxy
Interacting galaxies (colliding galaxies) are galaxies whose gravitational fields result in a disturbance of one another.
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International Astronomical Union
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
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Iota Serpentis
Iota Serpentis, Latinized from ι Serpentis, is a triple star system in the constellation Serpens, in its head (Serpens Caput).
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Iron peak
The iron peak is a local maximum in the vicinity of Fe (Cr, Mn, Fe, Co and Ni) on the graph of the abundances of the chemical elements, as seen below.
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Irregular variable
An irregular variable is a type of variable star in which variations in brightness show no regular periodicity.
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Johann Bayer
Johann Bayer (1572 – 7 March 1625) was a German lawyer and uranographer (celestial cartographer).
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Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
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Kappa Serpentis
Kappa Serpentis, Latinized from κ Serpentis, is a star in the constellation Serpens, in its head (Serpens Caput).
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Kelvin
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
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Kerr metric
The Kerr metric or Kerr geometry describes the geometry of empty spacetime around a rotating uncharged axially-symmetric black hole with a spherical event horizon.
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L183
L183 or L134N is a much-studied pre-stellar core in the constellation Serpens Cauda 360 light-years away.
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Lambda Boötis star
A Lambda Boötis star is a type of peculiar star which has an unusually low abundance of iron peak elements in its surface layers.
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Lambda Serpentis
Lambda Serpentis (λ Ser, λ Serpentis) is a star in the constellation Serpens, in its head (Serpens Caput).
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Libra (constellation)
Libra is a constellation of the zodiac.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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List of stars in Serpens
This is the list of notable stars in the constellation Serpens, sorted by decreasing brightness.
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Lists of constellations
The following lists of constellations are available.
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Lithium
Lithium (from lit) is a chemical element with symbol Li and atomic number 3.
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Low-ionization nuclear emission-line region
A low-ionization nuclear emission-line region (LINER) is a type of galactic nucleus that is defined by its spectral line emission.
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Luminous infrared galaxy
Luminous infrared galaxies or LIRGs are galaxies with luminosities, the measurement of brightness, above.
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Magnetic moment
The magnetic moment is a quantity that represents the magnetic strength and orientation of a magnet or other object that produces a magnetic field.
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Manganese
Manganese is a chemical element with symbol Mn and atomic number 25.
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Mercury (element)
Mercury is a chemical element with symbol Hg and atomic number 80.
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Messier 5
Messier 5 or M5 (also designated NGC 5904) is a globular cluster in the constellation Serpens.
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Meteor shower
A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.
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Millisecond pulsar
A millisecond pulsar (MSP) is a pulsar with a rotational period in the range of about 1–10 milliseconds.
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Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
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Mira variable
Mira variables ("Mira", Latin, adj. - feminine form of adjective "wonderful"), named for the prototype star Mira, are a class of pulsating variable stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
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Molecular cloud
A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit the formation of molecules, most commonly molecular hydrogen (H2).
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Mu Serpentis
Mu Serpentis, Latinized from μ Serpentis, is a binary star in the Serpens Caput (head) section of the equatorial constellation Serpens.
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NASA/IPAC Extragalactic Database
The NASA/IPAC Extragalactic Database (NED) is an on-line astronomical database for astronomers that collates and cross-correlates astronomical information on extragalactic objects (galaxies, quasars, radio, x-ray and infrared sources, etc.). NED was created in the late 1980s by two Pasadena astronomers, George Helou and Barry F. Madore.
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Nebula
A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.
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Neutron star
A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.
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NGC 5921
NGC 5921 is a barred spiral galaxy located approximately 65 million light-years from the Solar System in the constellation Serpens Caput.
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NGC 5962
NGC 5962 is a spiral galaxy in the constellation Serpens Caput and is the brightest member of the Serpens galaxy cluster.
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NGC 5964
NGC 5964 is a barred spiral galaxy in the constellation Serpens Caput.
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NGC 6118
NGC 6118 is a grand design spiral galaxy located 83 million light-years away in the constellation Serpens (the Snake).
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NGC 6535
NGC 6535 is a globular cluster 22,200 light years from Earth in the Constellation Serpens, and is listed in the New General Catalogue.
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NGC 6604
NGC 6604 is an open star cluster located 5500 light years away in the constellation of Serpens and is located about two degrees north of the Eagle Nebula.
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Ningishzida
Ningishzida (sum: dnin-g̃iš-zid-da) is a Mesopotamian deity of vegetation and the underworld.
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Nitrogen
Nitrogen is a chemical element with symbol N and atomic number 7.
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NN Serpentis
NN Serpentis (abbreviated NN Ser) is an eclipsing post-common envelope binary system approximately 1670 light-years away.
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Northern Hemisphere
The Northern Hemisphere is the half of Earth that is north of the Equator.
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Nu Serpentis
Nu Serpentis (ν Ser, ν Serpentis) is a solitary star in the constellation Serpens.
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O-type star
An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers.
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OB star
OB stars are hot, massive stars of spectral types O or early-type B that form in loosely organized groups called OB associations.
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Omega Serpentis
Omega Serpentis (ω Ser, ω Serpentis) is a solitary star within the Serpens Caput part of the equatorial constellation of Serpens.
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Omicron Serpentis
Omicron Serpentis (ο Ser, ο Serpentis) is a solitary star in the Serpens Cauda (tail) section of the equatorial constellation Serpens.
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Ophiuchus
Ophiuchus is a large constellation straddling the celestial equator.
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Orion variable
An Orion variable is a variable star which exhibits irregular and eruptive variations in its luminosity and is typically associated with diffuse nebulae.
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Oxygen
Oxygen is a chemical element with symbol O and atomic number 8.
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P Cygni
P Cygni (34 Cyg) is a variable star in the constellation Cygnus.
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Palomar 5
Palomar 5 is a globular cluster discovered by Walter Baade in 1950.
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Photoevaporation
Photoevaporation denotes the process where energetic radiation ionises gas and causes it to disperse away from the ionising source.
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Pi Serpentis
Pi Serpentis, Latinized from π Serpentis, is a solitary white-hued star in the constellation Serpens, located in its head, Serpens Caput.
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Pillars of Creation
Pillars of Creation is a photograph taken by the Hubble Space Telescope of elephant trunks of interstellar gas and dust in the Eagle Nebula, specifically the Serpens constellation, some 6,500–7,000 light years from Earth.
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Planetary nebula
A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
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Popular Astronomy (US magazine)
Popular Astronomy is an American magazine published by John August Media, LLC and hosted at TechnicaCuriosa.com for amateur astronomers.
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Proper motion
Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.
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Protostar
A protostar is a very young star that is still gathering mass from its parent molecular cloud.
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Psi Serpentis
Psi Serpentis (ψ Ser, ψ Serpentis) is a triple star system within the Serpens Caput part of the equatorial constellation Serpens.
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Ptolemy
Claudius Ptolemy (Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos; Claudius Ptolemaeus) was a Greco-Roman mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.
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Pulsar
A pulsar (from pulse and -ar as in quasar) is a highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation.
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Pulsar wind nebula
A pulsar wind nebula (PWN, plural PWNe), sometimes called a plerion (derived from the Greek "πλήρης", pleres, meaning "full"), is a type of nebula found inside the shells of supernova remnants (SNRe) that is powered by pulsar winds generated by its central pulsar.
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R Serpentis
R Serpentis (R Ser) is a Mira variable type star in the constellation Serpens.
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Radiant (meteor shower)
The radiant or apparent radiant of a meteor shower is the point in the sky from which (to a planetary observer) meteors appear to originate.
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Radio galaxy
Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths, with luminosities up to 1039 W between 10 MHz and 100 GHz.
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Radio wave
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
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Rain
Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then becomes heavy enough to fall under gravity.
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Red dwarf
A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.
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Red giant
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
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Red Rectangle Nebula
The Red Rectangle Nebula, so called because of its red color and unique rectangular shape, is a protoplanetary nebula in the Monoceros constellation.
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Red Square Nebula
The Red Square Nebula is a celestial object located in the area of the sky occupied by star MWC 922 in the constellation Serpens.
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Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
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Right ascension
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
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Ring galaxy
A ring galaxy is a galaxy with a circle-like appearance.
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RR Lyrae variable
RR Lyrae variables are periodic variable stars, commonly found in globular clusters.
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Sagittarius (constellation)
Sagittarius is one of the constellations of the zodiac.
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Scutum (constellation)
Scutum is a small constellation introduced in the seventeenth century.
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Serpens South
The Serpens South star cluster is a relatively dense group of more than 600 young stars, dozens of which are protostars just beginning to form.
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Seyfert galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars.
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Seyfert's Sextet
Seyfert's Sextet is a group of galaxies about 190 million light-years away in the constellation Serpens.
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Sh2-54
Sh2-54 is an extended bright nebula in the constellation of Serpens.
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Shilou County
Shilou County is a county of Shanxi, China.
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Silicon
Silicon is a chemical element with symbol Si and atomic number 14.
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SIMBAD
SIMBAD (the Set of Identifications, Measurements, and Bibliography for Astronomical Data) is an astronomical database of objects beyond the Solar System.
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Slowly pulsating B-type star
A slowly pulsating B-type star (SPB), formerly known as a 53 Persei variable, is a type of pulsating variable star.
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SN 1987A
SN 1987A was a peculiar type II supernova in the Large Magellanic Cloud, a dwarf galaxy satellite of the Milky Way.
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Snake
Snakes are elongated, legless, carnivorous reptiles of the suborder Serpentes.
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Solar analog
Solar-type star, solar analogs (also analogues), and solar twins are stars that are particularly similar to the Sun.
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Solar-like oscillations
Solar-like oscillations are oscillations in distant stars that are excited in the same way as those in the Sun, namely by turbulent convection in its outer layers.
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Spectral line
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
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Spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
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Spitzer Space Telescope
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space telescope launched in 2003 and still operating as of 2018.
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Square degree
A square degree (deg2) is a non-SI-compliant unit measure of solid angle.
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Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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Stellar kinematics
In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
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Stellar wind
A stellar wind is a flow of gas ejected from the upper atmosphere of a star.
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Stellar-wind bubble
Stellar-wind bubble is a cavity light years across filled with hot gas blown into the interstellar medium by the high-velocity (several thousand km/s) stellar wind from a single massive star of type O or B. Weaker stellar winds also blow bubble structures, which are also called astrospheres.
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Strontium
Strontium is the chemical element with symbol Sr and atomic number 38.
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Students for the Exploration and Development of Space
Students for the Exploration and Development of Space (SEDS) is an international student organization whose purpose is to promote space exploration and development through educational and engineering projects.
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Subgiant
A subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as true giant stars.
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Supermassive black hole
A supermassive black hole (SMBH or SBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the centre of almost all currently known massive galaxies.
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Supernova
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
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Symbiotic nova
Symbiotic novae are slow irregular eruptive variable stars with very slow nova-like outbursts with an amplitude of between 9 and 11 magnitudes.
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Synchrotron radiation
Synchrotron radiation (also known as magnetobremsstrahlung radiation) is the electromagnetic radiation emitted when charged particles are accelerated radially, i.e., when they are subject to an acceleration perpendicular to their velocity.
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Tau4 Serpentis
Tau4 Serpentis, Latinized from τ4 Serpentis, is a M-type bright giant star in the constellation of Serpens, approximately 520 light-years from the Earth.
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Theta Serpentis
Theta Serpentis (θ Serpentis, abbreviated Theta Ser, θ Ser) is a triple star system in the constellation of Serpens.
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Tidal tail
A tidal tail is a thin, elongated region of stars and interstellar gas that extends into space from a galaxy.
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Type II supernova
A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star.
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Type-cD galaxy
The type-cD galaxy (also cD-type galaxy, cD galaxy) is a galaxy morphology classification, a subtype of type-D giant elliptical galaxy.
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Ultraviolet
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
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Variable nebula
Variable nebulae are reflection nebulae that change in brightness because of changes in their star.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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Virgo (constellation)
Virgo is one of the constellations of the zodiac.
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W Serpentis
W Serpentis is a multiple star in the constellation Serpens.
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Way of the Celestial Masters
The Way of the Celestial Masters is a Chinese Daoist movement that was founded by Zhang Daoling in 142 CE.
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Westerhout 40
Westerhout 40 or W40 (also designated Sharpless 64, Sh2-64, or RCW 174) is a star-forming region in our galaxy located in the constellation Serpens Cauda.
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White dwarf
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
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Wolf–Rayet star
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of highly ionised helium and nitrogen or carbon.
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X-ray
X-rays make up X-radiation, a form of electromagnetic radiation.
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X-ray binary
X-ray binaries are a class of binary stars that are luminous in X-rays.
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X-ray spectroscopy
X-ray spectroscopy is a gathering name for several spectroscopic techniques for characterization of materials by using x-ray excitation.
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Xi Serpentis
Xi Serpentis, Latinized from ξ Serpentis, is a triple star system in the Serpens Cauda (tail) section of the equatorial constellation Serpens.
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Zeta Serpentis
Zeta Serpentis, Latinized from ζ Serpentis, is the Bayer designation for a single, yellow-white hued star in the equatorial constellation of Serpens.
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16 Serpentis
16 Serpentis is a spectroscopic binary star in the constellation Serpens.
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25 Serpentis
25 Serpentis is a star system in the constellation of Serpens Caput.
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36 Serpentis
36 Serpentis, also known as b Serpentis, is a star in the constellation Serpens.
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3C 321
3C 321 is a system of two galaxies rotating around each other.
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5 Serpentis
5 Serpentis is a wide binary star system in Serpens Caput, the western section of the equatorial constellation of Serpens.
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59 Serpentis
59 Serpentis, also known as d Serpentis, is a multiple star in the constellation Serpens.
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80th parallel north
The 80th parallel north is a circle of latitude that is 80 degrees north of the Earth's equatorial plane, in the Arctic.
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80th parallel south
The 80th parallel south is a circle of latitude that is 80 degrees south of the Earth's equatorial plane.
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88 modern constellations
In modern astronomy, the sky (celestial sphere) is divided into 88 regions called constellations, generally based on the asterisms (which are also called "constellations") of Greek and Roman mythology.
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Redirects here:
Constellation Serpens, Serpens (constellation), Serpens Caput, Serpens Cauda, Serpens constellation, Serpentis.
References
[1] https://en.wikipedia.org/wiki/Serpens
