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

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

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