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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
58 Persei
64 Eridani
Alfirk
Alherem
Alkarab
Alnilam
Alnitak
α Doradus
Alphard
Altair
Aludra
Antares
Arneb
Aspidiske
Atria
Avior
Azmidi
b Velorum
Barnard's Star
β Doradus
β Hydri
β Pyxidis
β Reticuli
Betelgeuse
Brachium
BZ Crucis
Canopus
Capella
Caph
Copernicus
d Serpentis
Dabih Major
Dalim
δ Andromedae
δ Lupi
δ Pavonis
Deneb
Deneb Algedi
Denebola
Enif
ε Reticuli
Errai
η Carinae
Fafnir
FI Virginis
Gacrux
Gliese 412 A
WX Ursae Majoris
Gliese 536
Guniibuu
Hatysa
HO Librae
Hoedus I
ι1 Scorpii
k Orionis
κ Andromedae
Kaus Australis
Kitalpha
Kraz
La Superba
Lalande 18115
Lalande 21185
λ Andromedae
λ Leporis
λ Serpentis
Mebsuta
Mekbuda
Menkar
Miaplacidus
Mira
Mirfak
Muphrid
Naos
ν Centauri
Ogma
ω Lupi
ο Cassiopeiae
φ Aquarii
π5 Orionis
Piautos
Polaris
Polis
Proxima Centauri
q Carinae
Ran
Rana
Rastaban
ρ Lupi
Rigel
α Centauri A
Ross 154
Rukbat
Sadalsuud
Sadr
Saiph
Shaula
Sirius
Sirius B
Suhail
Sun
Tarazed
Teegarden's Star
θ Arae
α Centauri B
Tureis
υ1 Centauri
van Maanen's Star
Wolf 359
Yed Prior
Zaniah
ζ Cephei
ζ Piscium B
ζ Trianguli Australis
Achernar

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

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