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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
υ Geminorum
Markeb
Minchir
Miram
Mekbuda
υ1 Centauri
Polis
Rana
Rukbat
σ Boötis
Rastaban
θ Hydrae
Ogma
Nashira
ω Capricorni
b Velorum
Angetenar
Alshain
Copernicus
Cerberus
β Doradus
Brachium
β Reticuli
Adhafera
Acubens
Alkaphrah
Alfirk
Albaldah
Guniibuu
Grafias
λ Serpentis
La Superba
ι1 Scorpii
δ Pavonis
Elgafar
δ Lupi
δ Arae
van Maanen's Star
Caph
Wolf 359
Wezen
Alchiba
W Virginis
Ross 154
Mirfak
α Centauri A
Mira
Rigel
Castor B
Wolf 498
Atria
Deneb Algedi
Meissa
Proxima Centauri
λ Leporis
d Centauri
15 Orionis
λ Andromedae
Mebsuta
Lalande 21185
ζ Trianguli Australis
Lalande 18115
Deneb
δ Andromedae
Menkar
Ran
Kitalpha
Zaniah
Achird
Yed Prior
Canopus
Polaris
Capella
Tureis
BZ Crucis
ε Reticuli
Dabih Major
Sham
Shaula
FI Virginis
τ Ceti
Aludra
Tarazed
Barnard's Star
Azmidi
β Hydri
Antares
Sirius
Arneb
Sun
Sulafat
Sirius B
Suhail
Aspidiske
η Carinae
Enif
Schedar
HO Librae
Alkarab
π5 Orionis
Unurgunite
Avior
Hatysa
Betelgeuse
α Centauri B
Sadr
Saiph
Naos
Teegarden's Star
Almaaz
Sargas
Gliese 536
WX Ursae Majoris
Alnilam
Alnitak
Gliese 412 A
ν2 Canis Majoris
α Telescopii
Dalim
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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