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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 38m 16s
Declination-57° 9' 30"
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
Nashira
Minkar
Miram
Minchir
Mekbuda
Markeb
θ Hydrae
σ Boötis
υ1 Centauri
ο1 Cygni
ω Capricorni
Ogma
Rukbat
Rastaban
Polis
Rana
b Velorum
Alshain
β Doradus
Copernicus
Cerberus
β Reticuli
Adhafera
Acubens
Alkaphrah
Alfirk
Albaldah
ι1 Scorpii
Guniibuu
Grafias
HD 215152
La Superba
Elgafar
λ Serpentis
δ Arae
λ Andromedae
λ Leporis
Hatysa
Tureis
15 Orionis
α Centauri B
Unurgunite
Lalande 21185
Menkar
HO Librae
van Maanen's Star
Achird
Wolf 498
Wezen
W Virginis
Yed Prior
Mira
Mirfak
Lalande 18115
Alchiba
Zaniah
Kitalpha
HR 7687
Meissa
Mebsuta
ζ Trianguli Australis
Wolf 359
Dabih Major
Alherem
α Centauri A
Barnard's Star
Schedar
ε Reticuli
Sargas
Saiph
Sadr
Enif
Betelgeuse
BZ Crucis
Ross 154
Canopus
Rigel
Sham
Capella
Caph
ρ Cygni
Castor B
Deneb Algedi
π5 Orionis
Deneb
Ran
Polaris
δ Pavonis
δ Andromedae
Dalim
η Carinae
Shaula
Alkarab
Tarazed
Almaaz
Naos
Gliese 536
Alnilam
Alnitak
WX Ursae Majoris
Teegarden's Star
Gliese 412 A
ν2 Canis Majoris
α Telescopii
Proxima Centauri
τ Ceti
Aludra
Azmidi
FI Virginis
Sun
Sulafat
Suhail
Antares
Arneb
Sirius B
Sirius
Aspidiske
σ Orionis
Atria
Avior
Brachium
Achernar

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

Indexes

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