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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.5
Absolute: -2.8
Spectral ClassB3V Blue Dwarf
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star

A blue dwarf star with an unusual spectrum, Achernar has a magnitude of +0.5, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The River's End: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

HR Diagram
Miram
Minchir
La Superba
Mekbuda
Poerava
Polis
Rukbat
Rastaban
Sharjah
Rana
θ Hydrae
Nashira
ο1 Cygni
ω Capricorni
b Velorum
Axólotl
Alshain
Cerberus
Copernicus
Koeia
β Reticuli
Alkaphrah
Acubens
Adhafera
Albaldah
Grafias
Guniibuu
Felixvarela
ι1 Scorpii
Hoggar
Dombay
Ebla
δ Arae
HR 7687
BZ Crucis
van Maanen's Star
Brachium
Achird
Zaniah
UV Ceti
Lalande 18115
Canopus
Kitalpha
Mebsuta
Dabih Major
KX Librae
δ Pavonis
Meissa
Betelgeuse
Polaris
15 Orionis
Capella
Wolf 498
δ Caeli
61 Cygni A
Deneb
Deneb Algedi
ι Canis Majoris
Castor B
Yed Prior
Wolf 359
61 Cygni B
Wezen
ζ Trianguli Australis
Ran
δ Circini
π5 Orionis
Caph
W Virginis
Proxima Centauri
Arneb
Menkar
Avior
Saiph
Sargas
Barnard's Star
η Carinae
α Telescopii
τ Ceti
δ Andromedae
Schedar
Azmidi
Tarazed
Atria
Gliese 412 A
Naos
Sham
Sulafat
Suhail
FI Virginis
Aspidiske
Antares
ν2 Canis Majoris
Sirius B
Sirius
Sadr
Teegarden's Star
Unurgunite
ο Capricorni B
ρ Cygni
HO Librae
Tureis
Alchiba
HH Andromedae
σ Orionis
α Centauri A
Ross 154
Alfirk
Hatysa
Minkar
Alnitak
Mira
Alherem
Enif
Mirfak
Alkarab
Almaaz
β Doradus
ε Reticuli
Gliese 536
WX Ursae Majoris
Alnilam
Rigel
Sun
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

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