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Documents for "Astronomy: Stars":
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Achernar
brightest star in the constellation Eridanus ; Bayer designation α Eridani; 1992 position R.A. 1 h 37.4 m , Dec. -57°16′....
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Acrux
[from the Bayer designation α Crucis], brightest star in the constellation Crux (Southern Cross); 1992 position R.A. 12 h 26.2 m...
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Adhara
bright star in the constellation Canis Major ; Bayer designation Canis Majoris; 1992 position R.A. 6 h 58.3 m , Dec. -31°54′....
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Aldebaran
brightest star in the constellation Taurus ; Bayer designation α Tauri; 1992 position R.A. 4 h 35.5 m , Dec. +16°30′....
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Algol
famous variable star in the constellation Perseus ; Bayer designation β Persei; 1992 position R.A. 3 h 07.7 m , Dec. +40°55′. Algol's variation in apparent magnitude , from 2.06 to 3.28, is due to the fact that it is an eclipsing binary star , with one component revolving about the other with a period of 2 days, 20 hr, 49 min. Because the plane of revolution is almost parallel to the line of sight, the star dims noticeably when the...
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Alpha Centauri
brightest star in the constellation Centaurus and 3d-brightest star in the sky; also known as Rigil Kent or Rigil Kentaurus; 1992 position R.A. 14 h 39.1 m , Dec. -60°49′. It is a yellow main-sequence star of the same spectral class (G2 V) as the sun and of about the same size and mass; its apparent magnitude is -0.26. Actually, Alpha Centauri is a triple-star system, the components being designated A, B, and C. Alpha Centauri C is also called Proxima Centauri because it is the closest star to the earth (other than the sun), at a distance of 4.28 light-years, components A and B are currently 4.34 light-years away. Proxima Centauri orbits about the common...
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Altair
brightest star in the constellation Aquila (Eagle); Bayer designation α Aquilae; 1992 position R.A. 19 h 50.5 m , Dec. +8°51′....
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Antares
brightest star in the constellation Scorpius ; Bayer designation Alpha Scorpii; 1992 position R.A. 16 h 27.6 m , Dec. -26°22′....
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Arcturus
brightest star in the constellation Boötes and 4th-brightest star in the entire sky; Bayer designation Alpha Boötis; 1992 position R.A. 14 h 15.3 m , Dec. +19°13′. An orange giant of spectral class K2 III, it has an apparent magnitude of -0.06; its diameter is about 10 times that of the sun and its luminosity about 100 times that of the sun. Arcturus is one of the nearest giant stars, at a distance of about 36 light-years, and...
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Barnard's star
star with the largest observed proper motion (rate of motion across the sky with respect to other stars); located in the constellation Ophiuchus. The star's large proper motion, 10.28′′ per year (or half the moon's apparent diameter in a...
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Bellatrix
bright star in the constellation Orion ; Bayer designation Gamma Orionis; 1992 position R.A. 5 h 24.7 m , Dec. +6°21′....
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Betelgeuse
bright star in the constellation Orion ; Bayer designation α Orionis; 1992 position R.A. 5 h 54.8 m , Dec. +7°24′....
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Canopus
in astronomy, 2d brightest star in the sky, located in the constellation Carina, which is part of the ancient constellation Argo Navis; Bayer designation α Carinae; 1992 position R.A. 6 h...
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Capella
brightest star in the constellation Auriga ; Bayer designation α Aurigae; 1992 position R.A. 5 h 16.1 m , Dec. +45°59′....
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Castor
bright star in the constellation Gemini ; Bayer designation α Geminorum; 1992 position R.A. 7 h 34.1 m , Dec. +31°54′....
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Deneb
brightest star in the constellation Cygnus ; Bayer designation Alpha Cygni; 1992 position R.A. 20 h 41.2 m , Dec. +45°15′. It is a white supergiant of spectral class A2 Ia; its intrinsic brightness (about 60,000 times as luminous as the sun) is the greatest of all the bright stars. Thus, even though it is also one of the most distant bright stars, being about...
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Fomalhaut
brightest star in the constellation Piscis Austrinus (southern fish); Bayer designation Alpha Piscis Austrini; 1992 position R.A. 22 h 57.3 m...
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Hadar
or Beta Centauri , bright star in the constellation Centaurus ; 1992 position R.A. 14 h 01.7 m , dec. -60°13′. A bluish-white...
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Mimosa
or Beta Crucis , bright star in the constellation Crux (Southern Cross); 1992 position R.A. 12 h 47.3 m , Dec. -59°39′....
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Mira
[Lat.,=marvelous], variable star in the constellation Cetus; Bayer designation Omicron Ceti; 1992 position R.A. 2 h 19.0 m , Dec. -3°05′. The most famous long-period variable, Mira ranges in apparent magnitude from a maximum of about 2.0 to a minimum of about 10.1 with a period of a little less than a year (332 days). Thus, it is visible to the naked eye for about half a year and can be seen only through...
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Polaris
or North Star, star nearest the north celestial pole (see equatorial coordinate system ). It is in the constellation Ursa Minor (see Ursa Major and Ursa Minor ; Bayer designation Alpha Ursae Minoris) and marks the end of the handle of the Little Dipper. Polaris's location less than 1° from the pole (1992 position R.A. 2 h 23.3 m , Dec. +89°14′) makes it a very important navigational star even though it is only of second magnitude; it always marks due north from an observer. Polaris can be located by following the line...
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Pollux
brightest star in the constellation Gemini ; Bayer designation Beta Geminorum; 1992 position R.A. 7 h 44.8 m , Dec. +28°03′....
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Procyon
brightest star in the constellation Canis Minor ; Bayer designation α Canis Minoris; 1992 position R.A. 7 h 38.9 m , Dec.+5°15′....
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Regulus
brightest star in the constellation Leo ; Bayer designation Alpha Leonis; 1992 position R.A. 10 h 08 m , Dec. +12°00′....
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Rigel
bright star in the constellation Orion ; Bayer designation Beta Orionis; 1992 position R.A. 5 h 14.2 m , Dec. -8°13′. A huge, blue supergiant of spectral class B8 Ia, Rigel has an intrinsic brightness about 40,000 times as luminous as that of the sun. It is an irregular variable star , with apparent magnitude ranging from 0.08 to 0.20, making it normally the seventh-brightest star in the sky. Its distance from the earth is nearly 1,000 light-years. Rigel is actually a four-star system consisting of a...
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Shaula
bright star in the constellation Scorpius ; Bayer designation Lambda Scorpii; 1992 position R.A. 17 h 33.7 m , Dec. -37°06′....
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Sirius
or Dog Star, brightest star in the sky. It is located in the constellation Canis Major (1992 position R.A. 6 h 44.8 m , Dec. -16°42′); its Bayer designation is Alpha Canis Majoris. Sirius [Gr.,=scorching], having an apparent magnitude of -1.45, is exceeded in brightness only by the sun, the moon, and Venus and by Mars and Jupiter at their maximum brightness. A white, main-sequence star of spectral class A1 V, Sirius is about twice the size of the sun and about 20 times as luminous. It is also one of the nearest stars, lying at a distance of 8.7 light-years, so that it has been studied extensively...
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Spica
brightest star in the constellation Virgo ; Bayer designation Alpha Virginis; 1992 position R.A. 13 h 24.8 m , Dec. -11°07′....
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Vega
brightest star in the constellation Lyra ; Bayer designation Alpha Lyrae; 1992 position R.A. 18 h 36.7 m , Dec. +38°47′. A white main-sequence star of spectral class A0 V, its apparent magnitude is 0.1, making it the fifth brightest star in the sky. Vega is about three times the size of the sun and 50 times as luminous. Its distance from the earth is 26 light-years. Its name is from the...
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