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

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

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