Achernar

Achernar

Starbox begin
name=Achernar
Starbox image


caption=The position of Achernar.
Starbox observe
epoch=J2000
constell=Eridanus
ra=01h 37m 42.8s
dec=−57° 14' 12"
appmag_v=0.50
Starbox character
class=B3 Vpe
b-v=−0.20
u-b=−0.66
variable=Lambda Eridani
Starbox astrometry
radial_v=16
prop_mo_ra=88.02
prop_mo_dec=−40.08
gal_lat=−58.7920
gal_lon=290.8412
parallax=022.68
p_error=0.57
absmag_v=−2.77
Starbox detail
age=1–5 × 108
metal=
mass=6–8
radius=~10
rotation=225–300 km/s
luminosity=3,311(bolometric) | temperature=14,510
Starbox catalog
names=α Eri, HR 472, CD -57°334, HD 10144, SAO 232481, FK5 54, HIP 7588.

Achernar (α Eri / α Eridani / Alpha Eridani), sometimes spelled Achenar, is the brightest star in the constellation Eridanus and the eighth-brightest star in the nighttime sky. It lies at the southern tip of the constellation.

Achernar is a bright, blue B-type star of six to eight solar masses lying approximately convert|144|ly|pc|abbr=off|lk=on away. Although classified as a main-sequence (dwarf) star, it is about 3,000 times more luminous than the Sun. Achernar is in the deep southern sky and never rises above 33°N. Achernar is best seen from the southern hemisphere in November; it is circumpolar below 33°S.

Until about March 2000, Achernar and Fomalhaut were the two first-magnitude stars furthest in angular distance from any other first-magnitude star in the celestial sphere. Antares, in the constellation of Scorpius, is now the most isolated first-magnitude star.

It is the least spherical star in the Milky Way studied to date. Achernar spins so rapidly that its equatorial diameter is more than 50% greater than its polar diameter.

The name comes from the Arabic _ar. آخر النهر " _ar. ākhir an-nahr" "river's end".

It is known as _zh. 水委一 (" _zh. Shuǐwěiyī", the First Star of the Crooked Running Water) in Chinese.

Fiction

* Achernar in fiction

External links

* [http://www.solstation.com/x-objects/achernar.htm Achernar at solstation.com]
* [http://www.absoluteastronomy.com/stars/achernar.htm Achernar at absoluteastronomy.com]
* [http://arxiv.org/abs/astro-ph/0602084 Surface temperature and synthetic spectral energy distributions for rotationally deformed stars]


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Look at other dictionaries:

  • Achernar — α Eridani Données d observation (Époque J2000.0) Ascension droite 01h 37m 42.8466s Déclinaison …   Wikipédia en Français

  • Achernar — Posición de Achernar. Datos de observación (Época J2000) Constelación Eridanus …   Wikipedia Español

  • Achernar —   [arabisch »Ende des Flusses« (bezogen auf die Lage des Sterns am Ende des auch »Fluss Eridanus« genannten Sternbildes Eridanus)], der hellste Stern (α) im Sternbild Eridanus; ein Stern 1. Größe …   Universal-Lexikon

  • achernar — ou akarnar (entrée créée par le supplément) (a chèr nar ou akar nar) s. m. Étoile brillante à l extrémité de la constellation d Éridan ; elle ne se lève jamais sur l horizon de Paris. ÉTYMOLOGIE    Arabe, akhir an nahr ( a long pour akhir), l… …   Dictionnaire de la Langue Française d'Émile Littré

  • Achernar — [ā′kər när΄] n. [Ar ʾ akhīr nahr < ʾ akhīr, the end, final + nahr, river: the Ar name of the constellation itself is nahr ʾ urdunn, lit., river Jordan] the brightest star in the constellation Eridanus: magnitude, 0.5 …   English World dictionary

  • Achernar — Datenbanklinks zu Achernar / Alpha Eridani Stern Achernar (α Eridani) …   Deutsch Wikipedia

  • Achernar Island — (coord|66|58|S|57|12|E|) is an island 1.5 miles (2.4 km) long, lying 1 mile (1.6 km) west of Shaula Island in the Oygarden Group. Mapped by Norwegian cartographers from aerial photos taken by the Lars Christensen Expedition, 1936 37, and named… …   Wikipedia

  • Achernar — …   Википедия

  • Achernar — /ay keuhr nahr /, n. Astron. a star of the first magnitude in the constellation Eridanus. [ < Ar akhir al nahr end of the river] * * * …   Universalium

  • Achernar — ► ASTRONOMÍA Estrella de la constelación de Erídano …   Enciclopedia Universal

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