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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
υ4 Eridani
Miram
Mekbuda
υ1 Centauri
Polis
Rastaban
ρ Lupi
Rukbat
σ Boötis
θ Hydrae
Ogma
Nashira
Terebellum
Tarazed
ω Capricorni
Rana
b Velorum
Angetenar
Alshain
β Doradus
Copernicus
Cerberus
Brachium
β Reticuli
Adhafera
Acubens
Albaldah
Alkaphrah
Alherem
Alfirk
δ Lupi
Guniibuu
Grafias
λ Serpentis
La Superba
ι1 Scorpii
δ Pavonis
Elgafar
Mirfak
Wolf 498
Wolf 359
Wezen
Ross 154
π5 Orionis
van Maanen's Star
Alchiba
Mira
α Centauri A
Rigel
Polaris
Barnard's Star
Deneb Algedi
Acamar
λ Leporis
15 Orionis
δ Andromedae
Mebsuta
λ Andromedae
Meissa
ζ Trianguli Australis
Lalande 21185
Lalande 18115
Dalim
Rasalgethi
Achird
Menkar
Dabih Major
Zaniah
Kitalpha
Yed Prior
Ran
d Centauri
Deneb
Unurgunite
Caph
HO Librae
Sun
Gacrux
Schedar
Aludra
ε Reticuli
FI Virginis
β Hydri
Antares
Sham
Sulafat
Proxima Centauri
Arneb
Suhail
Shaula
Aspidiske
η Carinae
Atria
Sirius B
Sirius
Avior
τ Ceti
Betelgeuse
Tureis
Naos
Castor B
α Centauri B
Azmidi
Hatysa
Alkarab
Canopus
Almaaz
BZ Crucis
Sadr
Saiph
Sargas
Alnilam
Alnitak
Gliese 536
WX Ursae Majoris
α Telescopii
Teegarden's Star
Gliese 412 A
Enif
ν2 Canis Majoris
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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