59 relations: Absolute magnitude, Absorption spectroscopy, American Association of Variable Star Observers, Apparent magnitude, Astronomical spectroscopy, Astronomical unit, Astronomische Gesellschaft Katalog, Bayer designation, Boss General Catalogue, Bright Star Catalogue, Calcium, Carbon, Chromosphere, Color index, Condensation, Corona Borealis, Cyanogen, Durchmusterung, Edward Pigott, Extreme helium star, Friedrich Wilhelm Argelander, Gaia (spacecraft), General Catalogue of Stellar Radial Velocities, Guide Star Catalog, Helium, Helium flash, Henry Draper Catalogue, Hipparcos, Hydrogen, IRAS, Johann Bayer, John Flamsteed, Large Magellanic Cloud, Lithium, Metal, Naked eye, P Cygni, Photosphere, Planetary nebula, PPM Star Catalogue, R Coronae Borealis variable, Radiation pressure, RAFGL, RY Sagittarii, Shock wave, Smithsonian Astrophysical Observatory Star Catalog, Soot, Spectral line, Spectroscopy, Star catalogue, ..., Stellar atmosphere, Stellar wind, Supergiant star, Temperature, Variable star, Variable star designation, Wavelength, White dwarf, 2MASS. Expand index (9 more) » « Shrink index
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of radiation, as a function of frequency or wavelength, due to its interaction with a sample.
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.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light and radio, which radiates from stars and other celestial objects.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
The Astronomische Gesellschaft Katalog (AGK) is an astrometric star catalogue.
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.
Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.
The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, 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.
Calcium is a chemical element with symbol Ca and atomic number 20.
Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
The chromosphere (literally, "sphere of color") is the second of the three main layers in the Sun's atmosphere and is roughly 3,000 to 5,000 kilometers deep.
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.
Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of vapourisation.
Corona Borealis is a small constellation in the Northern Celestial Hemisphere.
Cyanogen is the chemical compound with the formula (CN)2.
In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
Edward Pigott (1753–1825) was an English astronomer.
An extreme helium star (abbreviated EHe) is a low-mass supergiant that is almost devoid of hydrogen, the most common chemical element of the Universe.
Friedrich Wilhelm August Argelander (22 March 1799 – 17 February 1875) was a German astronomer.
Gaia is a space observatory of the European Space Agency (ESA) designed for astrometry: measuring the positions and distances of stars with unprecedented precision.
The General Catalogue of Stellar Radial Velocities is a star catalogue which lists radial velocities for 15,107 stars.
The Guide Star Catalog (GSC), also known as the Hubble Space Telescope, Guide Catalog (HSTGC), is a star catalog compiled to support the Hubble Space Telescope with targeting off-axis stars.
Helium (from lit) is a chemical element with symbol He and atomic number 2.
A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of low mass stars (between 0.8 solar masses and 2.0) during their red giant phase (the Sun is predicted to experience a flash 1.2 billion years after it leaves the main sequence).
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
Hydrogen is a chemical element with symbol H and atomic number 1.
The Infrared Astronomical Satellite (IRAS) was the first-ever space telescope to perform a survey of the entire night sky at infrared wavelengths.
Johann Bayer (1572 – 7 March 1625) was a German lawyer and uranographer (celestial cartographer).
John Flamsteed FRS (19 August 1646 – 31 December 1719) was an English astronomer and the first Astronomer Royal.
The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way.
Lithium (from lit) is a chemical element with symbol Li and atomic number 3.
A metal (from Greek μέταλλον métallon, "mine, quarry, metal") is a material (an element, compound, or alloy) that is typically hard when in solid state, opaque, shiny, and has good electrical and thermal conductivity.
Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying or light-collecting optical instrument, such as a telescope or microscope.
P Cygni (34 Cyg) is a variable star in the constellation Cygnus.
The photosphere is a star's outer shell from which light is radiated.
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.
The PPM Star Catalogue (Positions and Proper Motions Star Catalogue) is the successor of the SAO Catalogue.
An R Coronae Borealis variable (abbreviated RCB, R CrB) is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation (a few tenths of a magnitude), and one irregular, unpredictably-sudden fading by 1 to 9 magnitudes.
Radiation pressure is the pressure exerted upon any surface due to the exchange of momentum between the object and the electromagnetic field.
RAFGL, the "Revised Air Force Geophysical Laboratory" (S.D. Price and T.L. Murdock, 1983), is a four-color infrared sky survey catalog.
RY Sagittarii is an yellow supergiant and an R Coronae Borealis type variable star in the constellation Sagittarius.
In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance.
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
Soot is a mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons.
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.
Spectroscopy is the study of the interaction between matter and electromagnetic radiation.
A star catalogue (Commonwealth English) or star catalog (American English), is an astronomical catalogue that lists stars.
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
A stellar wind is a flow of gas ejected from the upper atmosphere of a star.
Supergiants are among the most massive and most luminous stars.
Temperature is a physical quantity expressing hot and cold.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.