Achernar


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Achernar

(ā`kərnär'), brightest star in the constellation EridanusEridanus
, large southern constellation stretching SW from Orion for about 60°. Because of its long, winding shape it was identified with a river by many ancient civilizations; e.g., the Egyptians called it the Nile and the Babylonians called it the Euphrates.
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; Bayer designation α Eridani; 1992 position R.A. 1h37.4m, Dec. −57°16'. A bluish-white white star with apparent magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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 0.51, it is one of the 10 brightest stars in the entire sky. Its distance is about 120 light-years, and its luminosity about 600 times that of the sun. Achernar is of spectral classspectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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 B5 V. Its name is from the Arabic meaning "end of the river [Eridanus]."

Achernar

(ay -ker-nar) (α Eri) A conspicuous bluish-white star that is the brightest in the constellation Eridanus. mv : 0.5; Mv : –1.3; spectral type: B3 Vnp; distance: 22 pc.
References in periodicals archive ?
As a point of interest, the Southern star Achernar, has a tremendous oblateness which approaches 1.
That makes Achernar the flattest star known, report Pierre Kervella of the European Southern Observatory in Santiago, Chile, and his colleagues in an upcoming Astronomy & Astrophysics.
But such a star would fly apart long before it became as distorted as Achernar, says Marc H.
The long axis of the Southern Cross points towards a bright star called Achernar.
The most significant of these, at present, appears to be the southern star Achernar, a hot B-type star with a mass currently estimated at six times the mass of the Sun.
The south celestial pole is located midway between Crux and Achernar, the star marking the southern end of Eridanus (the River).
5) Dec [alpha] Eri, Achernar 01h38m17s -57[degrees]09' 29' [alpha] Tau, Aldebaran 04 36 49 +16 32 24 [beta] Ori, Rigel 05 15 17 -08 11 05 [gamma] Ori, Bellatrix 05 25 58 +06 21 46 [beta] Tau, Al Nath 05 27 17 +28 37 12 [epsilon] Ori, Alnilam 05 37 00 -01 11 35 [alpha] Ori, Betelgeuse 05 56 01 +07 24 31 [beta] CMa, Mirzam 06 23 23 -17 57 52 [alpha] Car, Canopus 06 24 18 -52 42 18 [gamma] Gem, Alhena 06 38 36 +16 23 06 [alpha] CMa, Sirius 06 45 50 -16 43 59 [epsilon] CMa, Adhara 06 59 14 -28 59 39 [delta] CMa, Wezen 07 09 01 -26 25 08 [alpha] Gem, Castor 07 35 35 +31 51 13 [alpha] CMi, Procyon 07 40 07 +05 11 19 [beta] Gem, Pollux 07 46 16 +27 59 16 [[gamma].
5) Dec [alpha] Eri, Achernar 01h 38m 15s -57[degrees]09' 48" [alpha] Tau, Aldebaran 04 36 45 +16 32 17 [beta] Ori, Rigel 05 15 14 -08 11 09 [gamma] Ori, Bellatrix 05 25 55 +06 21 43 [beta] Tau, Al Nath 05 27 13 +28 37 09 [epsilon] Ori, Alnilam 05 36 57 -01 11 37 [alpha] Ori, Betelgeuse 05 55 57 +07 24 31 [beta] CMa, Mirzam 06 23 20 -17 57 50 [alpha] Car, Canopus 06 24 16 -52 42 16 [gamma] Gem, Alhena 06 38 33 +16 23 09 [alpha] CMa, Sirius 06 45 48 -16 43 55 [epsilon] CMa, Adhara 06 59 12 -28 59 34 [delta] CMa, Wezen 07 08 59 -26 25 02 [alpha] Gem, Castor 07 35 32 +31 51 21 [alpha] CMi, Procyon 07 40 04 +05 11 28 [beta] Gem, Pollux 07 46 13 +27 59 25 [[gamma].
night, look for the Small Magellanic Cloud (SMC) between Achernar and
5) [alpha] Eri Achernar 01h -57[degrees] 11' 56" 37m 59.
The long arm of Crux points to Achernar, 60[degrees] away.