Table of Contents
195 relations: AB magnitude, Absolute magnitude, Air mass (astronomy), Airglow, Almagest, Alpha Centauri, Amateur astronomy, Andromeda Galaxy, Angular diameter, Apollo 8, Apollo command and service module, Apsis, Arcturus, Aristotle, Asteroid Terrestrial-impact Last Alert System, Astronomical object, Astronomical survey, Astronomical unit, Astrophysics, Atmosphere of Earth, Betelgeuse, Binoculars, Bortle scale, Bright Star Catalogue, Brown dwarf, Calibrator star, Callirrhoe (moon), Canopus, Catalina Sky Survey, Celestial sphere, Centaur (small Solar System body), Ceres (dwarf planet), Charge-coupled device, Charon (moon), Color index, Comet Ikeya–Seki, Common logarithm, Conjunction (astronomy), Cosmic dust, Cygnus OB2-12, Deimos (moon), Distance modulus, Double star, Earth, Earthlight (astronomy), Epsilon Canis Majoris, Eris (dwarf planet), Eta Carinae, European Southern Observatory, Extinction (astronomy), ... Expand index (145 more) »
- Logarithmic scales of measurement
AB magnitude
The AB magnitude system is an astronomical magnitude system. Apparent magnitude and aB magnitude are observational astronomy.
See Apparent magnitude and AB magnitude
Absolute magnitude
In astronomy, absolute magnitude is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. Apparent magnitude and absolute magnitude are observational astronomy.
See Apparent magnitude and Absolute magnitude
Air mass (astronomy)
In astronomy, air mass or airmass is a measure of the amount of air along the line of sight when observing a star or other celestial source from below Earth's atmosphere. Apparent magnitude and air mass (astronomy) are observational astronomy.
See Apparent magnitude and Air mass (astronomy)
Airglow
Airglow (also called nightglow) is a faint emission of light by a planetary atmosphere. Apparent magnitude and Airglow are observational astronomy.
See Apparent magnitude and Airglow
Almagest
The Almagest is a 2nd-century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths, written by Claudius Ptolemy in Koine Greek.
See Apparent magnitude and Almagest
Alpha Centauri
Alpha Centauri (α Cen, or Alpha Cen) is a triple star system in the southern constellation of Centaurus.
See Apparent magnitude and Alpha Centauri
Amateur astronomy
Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes. Apparent magnitude and Amateur astronomy are observational astronomy.
See Apparent magnitude and Amateur astronomy
Andromeda Galaxy
The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way.
See Apparent magnitude and Andromeda Galaxy
Angular diameter
The angular diameter, angular size, apparent diameter, or apparent size is an angular distance describing how large a sphere or circle appears from a given point of view.
See Apparent magnitude and Angular diameter
Apollo 8
Apollo 8 (December 21–27, 1968) was the first crewed spacecraft to leave Earth's gravitational sphere of influence, and the first human spaceflight to reach the Moon.
See Apparent magnitude and Apollo 8
Apollo command and service module
The Apollo command and service module (CSM) was one of two principal components of the United States Apollo spacecraft, used for the Apollo program, which landed astronauts on the Moon between 1969 and 1972.
See Apparent magnitude and Apollo command and service module
Apsis
An apsis is the farthest or nearest point in the orbit of a planetary body about its primary body.
See Apparent magnitude and Apsis
Arcturus
|- bgcolor.
See Apparent magnitude and Arcturus
Aristotle
Aristotle (Ἀριστοτέλης Aristotélēs; 384–322 BC) was an Ancient Greek philosopher and polymath.
See Apparent magnitude and Aristotle
Asteroid Terrestrial-impact Last Alert System
The Asteroid Terrestrial-impact Last Alert System (ATLAS) is a robotic astronomical survey and early warning system optimized for detecting smaller near-Earth objects a few weeks to days before they impact Earth.
See Apparent magnitude and Asteroid Terrestrial-impact Last Alert System
Astronomical object
An astronomical object, celestial object, stellar object or heavenly body is a naturally occurring physical entity, association, or structure that exists within the observable universe.
See Apparent magnitude and Astronomical object
Astronomical survey
An astronomical survey is a general map or image of a region of the sky (or of the whole sky) that lacks a specific observational target. Apparent magnitude and astronomical survey are observational astronomy.
See Apparent magnitude and Astronomical survey
Astronomical unit
The astronomical unit (symbol: au, or AU) is a unit of length defined to be exactly equal to.
See Apparent magnitude and Astronomical unit
Astrophysics
Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena.
See Apparent magnitude and Astrophysics
Atmosphere of Earth
The atmosphere of Earth is composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes), all retained by Earth's gravity.
See Apparent magnitude and Atmosphere of Earth
Betelgeuse
Betelgeuse is a red supergiant star in the constellation of Orion.
See Apparent magnitude and Betelgeuse
Binoculars
Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
See Apparent magnitude and Binoculars
Bortle scale
The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location.
See Apparent magnitude and Bortle scale
Bright Star Catalogue
The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars, Yale Bright Star Catalogue, or just YBS, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.
See Apparent magnitude and Bright Star Catalogue
Brown dwarf
Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars.
See Apparent magnitude and Brown dwarf
Calibrator star
A calibrator star is a star that is typically used tor calibration purposes on high-sensitized sensors located on space telescopes.
See Apparent magnitude and Calibrator star
Callirrhoe (moon)
Callirrhoe (Greek: Καλλιρρόη), also known as, is one of Jupiter's outer natural satellites.
See Apparent magnitude and Callirrhoe (moon)
Canopus
Canopus is the brightest star in the southern constellation of Carina and the second-brightest star in the night sky.
See Apparent magnitude and Canopus
Catalina Sky Survey
Catalina Sky Survey (CSS; obs. code: 703) is an astronomical survey to discover comets and asteroids.
See Apparent magnitude and Catalina Sky Survey
Celestial sphere
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth.
See Apparent magnitude and Celestial sphere
Centaur (small Solar System body)
In planetary astronomy, a centaur is a small Solar System body that orbits the Sun between Jupiter and Neptune and crosses the orbits of one or more of the giant planets.
See Apparent magnitude and Centaur (small Solar System body)
Ceres (dwarf planet)
Ceres (minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter.
See Apparent magnitude and Ceres (dwarf planet)
Charge-coupled device
A charge-coupled device (CCD) is an integrated circuit containing an array of linked, or coupled, capacitors.
See Apparent magnitude and Charge-coupled device
Charon (moon)
Charon, or (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto.
See Apparent magnitude and Charon (moon)
Color index
In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature.
See Apparent magnitude and Color index
Comet Ikeya–Seki
Comet Ikeya–Seki, formally designated C/1965 S1, 1965 VIII, and 1965f, was a long-period comet discovered independently by Kaoru Ikeya and Tsutomu Seki.
See Apparent magnitude and Comet Ikeya–Seki
Common logarithm
In mathematics, the common logarithm is the logarithm with base 10.
See Apparent magnitude and Common logarithm
Conjunction (astronomy)
In astronomy, a conjunction occurs when two astronomical objects or spacecraft appear to be close to each other in the sky.
See Apparent magnitude and Conjunction (astronomy)
Cosmic dust
Cosmic dustalso called extraterrestrial dust, space dust, or star dustis dust that occurs in outer space or has fallen onto Earth.
See Apparent magnitude and Cosmic dust
Cygnus OB2-12
Cygnus OB2 #12 is an extremely luminous blue hypergiant with an absolute bolometric magnitude (all electromagnetic radiation) of −10.9, among the most luminous stars known in the galaxy.
See Apparent magnitude and Cygnus OB2-12
Deimos (moon)
Deimos (systematic designation: Mars II) is the smaller and outer of the two natural satellites of Mars, the other being Phobos.
See Apparent magnitude and Deimos (moon)
Distance modulus
The distance modulus is a way of expressing distances that is often used in astronomy.
See Apparent magnitude and Distance modulus
Double star
In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes.
See Apparent magnitude and Double star
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
See Apparent magnitude and Earth
Earthlight (astronomy)
Earthlight is the diffuse reflection of sunlight reflected from Earth's surface and clouds.
See Apparent magnitude and Earthlight (astronomy)
Epsilon Canis Majoris
Epsilon Canis Majoris is a binary star system and the second-brightest star in the constellation of Canis Major.
See Apparent magnitude and Epsilon Canis Majoris
Eris (dwarf planet)
Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System.
See Apparent magnitude and Eris (dwarf planet)
Eta Carinae
Eta Carinae (η Carinae, abbreviated to η Car), formerly known as Eta Argus, is a stellar system containing at least two stars with a combined luminosity greater than five million times that of the Sun, located around distant in the constellation Carina.
See Apparent magnitude and Eta Carinae
European Southern Observatory
The European Organisation for Astronomical Research in the Southern Hemisphere, commonly referred to as the European Southern Observatory (ESO), is an intergovernmental research organisation made up of 16 member states for ground-based astronomy.
See Apparent magnitude and European Southern Observatory
Extinction (astronomy)
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer. Apparent magnitude and extinction (astronomy) are observational astronomy.
See Apparent magnitude and Extinction (astronomy)
Fenrir (moon)
Fenrir, or Saturn XLI (provisional designation S/2004 S 16), is a natural satellite of Saturn.
See Apparent magnitude and Fenrir (moon)
First-magnitude star
First-magnitude stars are the brightest stars in the night sky, with apparent magnitudes lower (i.e. brighter) than +1.50. Apparent magnitude and First-magnitude star are observational astronomy.
See Apparent magnitude and First-magnitude star
Full moon
The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective. Apparent magnitude and full moon are observational astronomy.
See Apparent magnitude and Full moon
Full width at half maximum
In a distribution, full width at half maximum (FWHM) is the difference between the two values of the independent variable at which the dependent variable is equal to half of its maximum value.
See Apparent magnitude and Full width at half maximum
Gaia (spacecraft)
Gaia is a space observatory of the European Space Agency (ESA), launched in 2013 and expected to operate until 2025.
See Apparent magnitude and Gaia (spacecraft)
Gamma-ray burst
In gamma-ray astronomy, gamma-ray bursts (GRBs) are immensely energetic explosions that have been observed in distant galaxies, being the brightest and most extreme explosive events in the entire universe, as NASA describes the bursts as the "most powerful class of explosions in the universe".
See Apparent magnitude and Gamma-ray burst
Ganymede (moon)
Ganymede, or Jupiter III, is the largest and most massive natural satellite of Jupiter and in the Solar System.
See Apparent magnitude and Ganymede (moon)
General relativity
General relativity, also known as the general theory of relativity and Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics.
See Apparent magnitude and General relativity
GRB 080319B
GRB 080319B was a gamma-ray burst (GRB) detected by the Swift satellite at 6:12 UTC on March 19, 2008.
See Apparent magnitude and GRB 080319B
Halley's Comet
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years.
See Apparent magnitude and Halley's Comet
Haumea
Haumea (minor-planet designation: 136108 Haumea) is a dwarf planet located beyond Neptune's orbit.
See Apparent magnitude and Haumea
Hellenistic Greece
Hellenistic Greece is the historical period of the country following Classical Greece, between the death of Alexander the Great in 323 BC and the annexation of the classical Greek Achaean League heartlands by the Roman Republic.
See Apparent magnitude and Hellenistic Greece
Hipparchus
Hipparchus (Ἵππαρχος, Hipparkhos; BC) was a Greek astronomer, geographer, and mathematician.
See Apparent magnitude and Hipparchus
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
See Apparent magnitude and Hipparcos
Historical brightest stars
The Solar System and all of the visible stars are in different orbits about the core of the Milky Way galaxy.
See Apparent magnitude and Historical brightest stars
Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and azimuth.
See Apparent magnitude and Horizontal coordinate system
Hubble Space Telescope
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
See Apparent magnitude and Hubble Space Telescope
Hubble Ultra-Deep Field
The Hubble Ultra-Deep Field (HUDF) is a deep-field image of a small region of space in the constellation Fornax, containing an estimated 10,000 galaxies.
See Apparent magnitude and Hubble Ultra-Deep Field
Human
Humans (Homo sapiens, meaning "thinking man") or modern humans are the most common and widespread species of primate, and the last surviving species of the genus Homo.
See Apparent magnitude and Human
Human eye
The human eye is an organ of the sensory nervous system that reacts to visible light and allows the use of visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm.
See Apparent magnitude and Human eye
Hydra (moon)
Hydra is a natural satellite of Pluto, with a diameter of approximately across its longest dimension.
See Apparent magnitude and Hydra (moon)
Iapetus (moon)
Iapetus is the outermost of Saturn's large moons.
See Apparent magnitude and Iapetus (moon)
Illuminance
In photometry, illuminance is the total luminous flux incident on a surface, per unit area.
See Apparent magnitude and Illuminance
Infrared
Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves.
See Apparent magnitude and Infrared
International Space Station
The International Space Station (ISS) is a large space station assembled and maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United States), Roscosmos (Russia), ESA (Europe), JAXA (Japan), and CSA (Canada).
See Apparent magnitude and International Space Station
Inverse-square law
In science, an inverse-square law is any scientific law stating that the observed "intensity" of a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity.
See Apparent magnitude and Inverse-square law
Irradiance
In radiometry, irradiance is the radiant flux received by a surface per unit area.
See Apparent magnitude and Irradiance
JADES-GS-z13-0
JADES-GS-z13-0 is a high-redshift Lyman-break galaxy discovered by the James Webb Space Telescope (JWST) during NIRCam imaging for the JWST Advanced Deep Extragalactic Survey (JADES) on 29 September 2022.
See Apparent magnitude and JADES-GS-z13-0
James Webb Space Telescope
The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy.
See Apparent magnitude and James Webb Space Telescope
Jansky
The jansky (symbol Jy, plural janskys) is a non-SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy.
See Apparent magnitude and Jansky
Jet Propulsion Laboratory
Jet Propulsion Laboratory (JPL) is a Federally Funded Research and Development Center (FFRDC) in La Cañada Flintridge, California, Crescenta Valley, United States.
See Apparent magnitude and Jet Propulsion Laboratory
Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
See Apparent magnitude and Jupiter
K correction
K correction converts measurements of astronomical objects into their respective rest frames.
See Apparent magnitude and K correction
Kreutz sungrazer
The Kreutz sungrazers are a family of sungrazing comets, characterized by orbits taking them extremely close to the Sun at perihelion.
See Apparent magnitude and Kreutz sungrazer
Kuiper belt
The Kuiper belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units (AU) to approximately 50 AU from the Sun.
See Apparent magnitude and Kuiper belt
Large Magellanic Cloud
The Large Magellanic Cloud (LMC) is a dwarf galaxy and satellite galaxy of the Milky Way.
See Apparent magnitude and Large Magellanic Cloud
LBV 1806−20
LBV 1806−20 is a candidate luminous blue variable (LBV) and likely binary star located around from the Sun, towards the center of the Milky Way.
See Apparent magnitude and LBV 1806−20
Lick Observatory
The Lick Observatory is an astronomical observatory owned and operated by the University of California.
See Apparent magnitude and Lick Observatory
Light pollution
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. Apparent magnitude and light pollution are observational astronomy.
See Apparent magnitude and Light pollution
Light-year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.
See Apparent magnitude and Light-year
Limiting magnitude
In astronomy, limiting magnitude is the faintest apparent magnitude of a celestial body that is detectable or detected by a given instrument. Apparent magnitude and limiting magnitude are observational astronomy.
See Apparent magnitude and Limiting magnitude
Line of sight
The line of sight, also known as visual axis or sightline (also sight line), is an imaginary line between a viewer/observer/spectator's eye(s) and a subject of interest, or their relative direction.
See Apparent magnitude and Line of sight
List of brightest stars
This is a list of stars arranged by their apparent magnitude – their brightness as observed from Earth.
See Apparent magnitude and List of brightest stars
List of nearest bright stars
This list of nearest bright stars is a table of stars found within 15 parsecs (48.9 light-years) of the nearest star, the Sun, that have an absolute magnitude of +8.5 or brighter, which is approximately comparable to a listing of stars more luminous than a red dwarf.
See Apparent magnitude and List of nearest bright stars
List of nearest stars
This list covers all known stars, white dwarfs, brown dwarfs, and sub-brown dwarfs within of the Sun.
See Apparent magnitude and List of nearest stars
Logarithmic scale
A logarithmic scale (or log scale) is a method used to display numerical data that spans a broad range of values, especially when there are significant differences between the magnitudes of the numbers involved. Apparent magnitude and logarithmic scale are logarithmic scales of measurement.
See Apparent magnitude and Logarithmic scale
Luhman 16
Luhman 16 (also designated WISE 1049−5319 or WISE J104915.57−531906.1) is a binary brown-dwarf system in the southern constellation Vela at a distance of from the Sun.
See Apparent magnitude and Luhman 16
Luminosity
Luminosity is an absolute measure of radiated electromagnetic energy (light) per unit time, and is synonymous with the radiant power emitted by a light-emitting object.
See Apparent magnitude and Luminosity
Luminosity distance
Luminosity distance DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object. Apparent magnitude and Luminosity distance are observational astronomy.
See Apparent magnitude and Luminosity distance
Lux
The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI).
See Apparent magnitude and Lux
M33-013406.63
M33-013406.63, also known as B416 or UIT301, is a O-type blue evolved supergiant star in the constellation of Triangulum.
See Apparent magnitude and M33-013406.63
Magnitude (astronomy)
In astronomy, magnitude is measure of the brightness of an object, usually in a defined passband. Apparent magnitude and magnitude (astronomy) are logarithmic scales of measurement and observational astronomy.
See Apparent magnitude and Magnitude (astronomy)
Makemake
Makemake (minor-planet designation: 136472 Makemake) is a dwarf planet and the second-largest of what is known as the classical population of Kuiper belt objects, with a diameter approximately that of Saturn's moon Iapetus, or 60% that of Pluto.
See Apparent magnitude and Makemake
Mars
Mars is the fourth planet from the Sun.
See Apparent magnitude and Mars
Mercury (planet)
Mercury is the first planet from the Sun and the smallest in the Solar System.
See Apparent magnitude and Mercury (planet)
Messier 41
Messier 41 (also known as M41 or NGC 2287) is an open cluster in the constellation Canis Major.
See Apparent magnitude and Messier 41
Messier 81
Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major.
See Apparent magnitude and Messier 81
Milky Way
The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.
See Apparent magnitude and Milky Way
Monochrome
A monochrome or monochromatic image, object or palette is composed of one color (or values of one color).
See Apparent magnitude and Monochrome
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal in astronomy, astrophysics and related fields.
See Apparent magnitude and Monthly Notices of the Royal Astronomical Society
Moon
The Moon is Earth's only natural satellite.
See Apparent magnitude and Moon
N. R. Pogson
Norman Robert Pogson, CIE (23 March 1829 – 23 June 1891) was an English astronomer who worked in India at the Madras observatory.
See Apparent magnitude and N. R. Pogson
Naked eye
Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection. Apparent magnitude and Naked eye are observational astronomy.
See Apparent magnitude and Naked eye
NASA
The National Aeronautics and Space Administration (NASA) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research.
See Apparent magnitude and NASA
Neptune
Neptune is the eighth and farthest known planet from the Sun.
See Apparent magnitude and Neptune
New moon
In astronomy, the new moon is the first lunar phase, when the Moon and Sun have the same ecliptic longitude.
See Apparent magnitude and New moon
Night sky
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Apparent magnitude and night sky are observational astronomy.
See Apparent magnitude and Night sky
Nix (moon)
Nix is a natural satellite of Pluto, with a diameter of across its longest dimension.
See Apparent magnitude and Nix (moon)
Non-Euclidean geometry
In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry.
See Apparent magnitude and Non-Euclidean geometry
Observational astronomy
Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, in contrast with theoretical astronomy, which is mainly concerned with calculating the measurable implications of physical models.
See Apparent magnitude and Observational astronomy
Occultation
An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. Apparent magnitude and occultation are observational astronomy.
See Apparent magnitude and Occultation
Opposition (astronomy)
In positional astronomy, two astronomical objects are said to be in opposition when they are on opposite sides of the celestial sphere, as observed from a given body (usually Earth). Apparent magnitude and opposition (astronomy) are observational astronomy.
See Apparent magnitude and Opposition (astronomy)
Opposition surge
The opposition surge (sometimes known as the opposition effect, opposition spike or Seeliger effect) is the brightening of a rough surface, or an object with many particles, when illuminated from directly behind the observer. Apparent magnitude and opposition surge are observational astronomy.
See Apparent magnitude and Opposition surge
Orion Nebula
The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion, and is known as the middle "star" in the "sword" of Orion.
See Apparent magnitude and Orion Nebula
P Cygni
P Cygni (34 Cygni) is a variable star in the constellation Cygnus.
See Apparent magnitude and P Cygni
Pan-STARRS
The Panoramic Survey Telescope and Rapid Response System (Pan-STARRS1; obs. code: F51 and Pan-STARRS2 obs. code: F52) located at Haleakala Observatory, Hawaii, US, consists of astronomical cameras, telescopes and a computing facility that is surveying the sky for moving or variable objects on a continual basis, and also producing accurate astrometry and photometry of already-detected objects.
See Apparent magnitude and Pan-STARRS
Passband
A passband is the range of frequencies or wavelengths that can pass through a filter.
See Apparent magnitude and Passband
Phase curve (astronomy)
In astronomy, a phase curve describes the brightness of a reflecting body as a function of its phase angle (the arc subtended by the observer and the Sun as measured at the body). Apparent magnitude and phase curve (astronomy) are observational astronomy.
See Apparent magnitude and Phase curve (astronomy)
Phobos (moon)
Phobos (systematic designation) is the innermost and larger of the two natural satellites of Mars, the other being Deimos.
See Apparent magnitude and Phobos (moon)
Photodetector
Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation.
See Apparent magnitude and Photodetector
Photographic film
Photographic film is a strip or sheet of transparent film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals.
See Apparent magnitude and Photographic film
Photographic magnitude
Photographic magnitude is a measure of the relative brightness of a star or other astronomical object as imaged on a photographic film emulsion with a camera attached to a telescope.
See Apparent magnitude and Photographic magnitude
Photometric system
In astronomy, a photometric system is a set of well-defined passbands (or optical filters), with a known sensitivity to incident radiation.
See Apparent magnitude and Photometric system
Photometry (astronomy)
In astronomy, photometry, from Greek photo- ("light") and -metry ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. Apparent magnitude and photometry (astronomy) are observational astronomy.
See Apparent magnitude and Photometry (astronomy)
Pluto
Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.
See Apparent magnitude and Pluto
Polaris
Polaris is a star in the northern circumpolar constellation of Ursa Minor.
See Apparent magnitude and Polaris
Power law
In statistics, a power law is a functional relationship between two quantities, where a relative change in one quantity results in a relative change in the other quantity proportional to a power of the change, independent of the initial size of those quantities: one quantity varies as a power of another.
See Apparent magnitude and Power law
Proper motion
Proper motion is the astrometric 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.
See Apparent magnitude and Proper motion
Proxima Centauri
Proxima Centauri is a small, low-mass star located away from the Sun in the southern constellation of Centaurus.
See Apparent magnitude and Proxima Centauri
Proxima Centauri b
Proxima Centauri b (or Proxima b), also referred to as Alpha Centauri Cb, is an exoplanet orbiting within the habitable zone of the red dwarf star Proxima Centauri, which is the closest star to the Sun and part of the larger triple star system Alpha Centauri.
See Apparent magnitude and Proxima Centauri b
Ptolemy
Claudius Ptolemy (Πτολεμαῖος,; Claudius Ptolemaeus; AD) was an Alexandrian mathematician, astronomer, astrologer, geographer, and music theorist who wrote about a dozen scientific treatises, three of which were important to later Byzantine, Islamic, and Western European science.
See Apparent magnitude and Ptolemy
Quasar
A quasar is an extremely luminous active galactic nucleus (AGN).
See Apparent magnitude and Quasar
R136a1
R136a1 (short for RMC 136a1) is one of the most massive and luminous stars known, at nearly and nearly 4.7 million, and is also one of the hottest, at around.
See Apparent magnitude and R136a1
Rayleigh scattering
Rayleigh scattering, named after the 19th-century British physicist Lord Rayleigh (John William Strutt), is the predominantly elastic scattering of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.
See Apparent magnitude and Rayleigh scattering
Red dwarf
A red dwarf is the smallest kind of star on the main sequence.
See Apparent magnitude and Red dwarf
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.
See Apparent magnitude and Red giant
Rigel
Rigel is a blue supergiant star in the constellation of Orion.
See Apparent magnitude and Rigel
Ritchey–Chrétien telescope
A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors (coma).
See Apparent magnitude and Ritchey–Chrétien telescope
Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped satellite galaxy of the Milky Way.
See Apparent magnitude and Sagittarius Dwarf Spheroidal Galaxy
Satellite flare
Satellite flare, also known as satellite glint, is a satellite pass visible to the naked eye as a brief, bright "flare".
See Apparent magnitude and Satellite flare
Saturn
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
See Apparent magnitude and Saturn
Sedna (dwarf planet)
Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun beyond the orbit of Neptune.
See Apparent magnitude and Sedna (dwarf planet)
Sirius
Sirius is the brightest star in the night sky.
See Apparent magnitude and Sirius
SN 1006
SN 1006 was a supernova that is likely the brightest observed stellar event in recorded history, reaching an estimated −7.5 visual magnitude, and exceeding roughly sixteen times the brightness of Venus.
See Apparent magnitude and SN 1006
SN 1054
SN 1054 was a supernova that was first observed on, and remained visible until.
See Apparent magnitude and SN 1054
SN 1987A
SN 1987A was a type II supernova in the Large Magellanic Cloud, a dwarf satellite galaxy of the Milky Way.
See Apparent magnitude and SN 1987A
Spectral flux density
In spectroscopy, spectral flux density is the quantity that describes the rate at which energy is transferred by electromagnetic radiation through a real or virtual surface, per unit surface area and per unit wavelength (or, equivalently, per unit frequency).
See Apparent magnitude and Spectral flux density
Star
A star is a luminous spheroid of plasma held together by self-gravity.
See Apparent magnitude and Star
Star catalogue
A star catalogue is an astronomical catalogue that lists stars.
See Apparent magnitude and Star catalogue
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
See Apparent magnitude and Stellar classification
Stevens's power law
Stevens' power law is an empirical relationship in psychophysics between an increased intensity or strength in a physical stimulus and the perceived magnitude increase in the sensation created by the stimulus.
See Apparent magnitude and Stevens's power law
Strömgren photometric system
The Strömgren photometric system, abbreviated also as uvbyβ or simply uvby, and sometimes referred as Strömgren - Crawford photometric system, is a four-colour medium-passband photometric system plus Hβ (H-beta) filters for determining magnitudes and obtaining spectral classification of stars.
See Apparent magnitude and Strömgren photometric system
Subaru Telescope
is the telescope of the National Astronomical Observatory of Japan, located at the Mauna Kea Observatory on Hawaii.
See Apparent magnitude and Subaru Telescope
Sun
The Sun is the star at the center of the Solar System.
See Apparent magnitude and Sun
Supergiant
Supergiants are among the most massive and most luminous stars.
See Apparent magnitude and Supergiant
Supernova impostor
Supernova impostors are stellar explosions that appear at first to be a supernova but do not destroy their progenitor stars.
See Apparent magnitude and Supernova impostor
Surface brightness
In astronomy, surface brightness (SB) quantifies the apparent brightness or flux density per unit angular area of a spatially extended object such as a galaxy or nebula, or of the night sky background. Apparent magnitude and surface brightness are observational astronomy.
See Apparent magnitude and Surface brightness
Telescope
A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation.
See Apparent magnitude and Telescope
The Astrophysical Journal
The Astrophysical Journal (ApJ) is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.
See Apparent magnitude and The Astrophysical Journal
Titan (moon)
Titan is the largest moon of Saturn and the second-largest in the Solar System.
See Apparent magnitude and Titan (moon)
Triangulum Galaxy
The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum.
See Apparent magnitude and Triangulum Galaxy
Triton (moon)
Triton is the largest natural satellite of the planet Neptune.
See Apparent magnitude and Triton (moon)
Twilight
Twilight is light produced by sunlight scattering in the upper atmosphere, when the Sun is below the horizon, which illuminates the lower atmosphere and the Earth's surface.
See Apparent magnitude and Twilight
UBV photometric system
The UBV photometric system (from Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a photometric system usually employed for classifying stars according to their colors.
See Apparent magnitude and UBV photometric system
Ultraviolet
Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays.
See Apparent magnitude and Ultraviolet
University of California
The University of California (UC) is a public land-grant research university system in the U.S. state of California.
See Apparent magnitude and University of California
Uranus
Uranus is the seventh planet from the Sun.
See Apparent magnitude and Uranus
UY Scuti
UY Scuti (BD-12°5055) is a red supergiant star, located 5,900 light-years away in the constellation Scutum.
See Apparent magnitude and UY Scuti
Vega
Vega is the brightest star in the northern constellation of Lyra.
See Apparent magnitude and Vega
Venus
Venus is the second planet from the Sun.
See Apparent magnitude and Venus
Very Large Telescope
The Very Large Telescope (VLT) is an astronomical facility operated since 1998 by the European Southern Observatory, located on Cerro Paranal in the Atacama Desert of northern Chile.
See Apparent magnitude and Very Large Telescope
Visible spectrum
The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye.
See Apparent magnitude and Visible spectrum
Visual acuity
Visual acuity (VA) commonly refers to the clarity of vision, but technically rates an animal's ability to recognize small details with precision.
See Apparent magnitude and Visual acuity
Visual perception
Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflected by objects in the environment.
See Apparent magnitude and Visual perception
Watt
The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3.
See Apparent magnitude and Watt
Weber–Fechner law
The Weber–Fechner laws are two related scientific laws in the field of psychophysics, known as Weber's law and Fechner's law.
See Apparent magnitude and Weber–Fechner law
WR 102
WR 102 is a Wolf–Rayet star in the constellation Sagittarius, an extremely rare star on the WO oxygen sequence.
See Apparent magnitude and WR 102
Zenith
The zenith is an imaginary point directly "above" a particular location, on the celestial sphere.
See Apparent magnitude and Zenith
Zeta1 Scorpii
Zeta1 Scorpii (Zeta1 Sco, ζ1 Scorpii, ζ1 Sco) is a B-type hypergiant star in the constellation of Scorpius.
See Apparent magnitude and Zeta1 Scorpii
10 Hygiea
Hygiea (minor-planet designation: 10 Hygiea) is a major asteroid located in the main asteroid belt.
See Apparent magnitude and 10 Hygiea
2 Pallas
Pallas (minor-planet designation: 2 Pallas) is the third-largest asteroid in the Solar System by volume and mass.
See Apparent magnitude and 2 Pallas
2060 Chiron
2060 Chiron is a ringed small Solar System body in the outer Solar System, orbiting the Sun between Saturn and Uranus.
See Apparent magnitude and 2060 Chiron
3C 273
3C 273 is a quasar located at the center of a giant elliptical galaxy in the constellation of Virgo.
See Apparent magnitude and 3C 273
4 Vesta
Vesta (minor-planet designation: 4 Vesta) is one of the largest objects in the asteroid belt, with a mean diameter of.
See Apparent magnitude and 4 Vesta
7 Iris
Iris (minor planet designation: 7 Iris) is a large main-belt asteroid and possible remnant planetesimal orbiting the Sun between Mars and Jupiter.
See Apparent magnitude and 7 Iris
See also
Logarithmic scales of measurement
- Absorbance
- American wire gauge
- Apparent magnitude
- Convenient number
- DBFS
- DBZ (meteorology)
- DBc
- DBm
- DBrn
- Decibel watt
- E series of preferred numbers
- Effective radiated power
- Energy class
- F-number
- Level (logarithmic quantity)
- Log reduction
- Log–log plot
- Logarithmic scale
- Magnitude (astronomy)
- Moment magnitude scale
- Order of magnitude
- PH
- Palermo Technical Impact Hazard Scale
- Preferred number
- Renard series
- Richter scale
- Slide rule scale
- Units of level
References
Also known as 10^(2/5), Apparant magnitude, Apparent Visual Brightness, Apparent Visual Magnitude, Apparent bightness, Apparent bolometric magnitude, Apparent brightness, Apparent luminosity, Apparent magnitudes, Apparent visual magnitudes, Fifth magnitude star, Optical magnitude, Pogson's Ratio, Pogsons ratio, Relative magnitude, Second magnitude star, Sixth magnitude star, Stellar magnitude, V magnitude, Visible magnitude, Visual apparent magnitude, Visual magnitude.