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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
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
Miram
Mekbuda
Minkar
Minchir
Nashira
θ Hydrae
Sharjah
υ1 Centauri
ο1 Cygni
ω Capricorni
Rukbat
Rastaban
Rana
Polis
Alshain
Axólotl
Copernicus
Cerberus
b Velorum
β Reticuli
β Doradus
Acubens
Adhafera
Alkaphrah
Alfirk
Albaldah
Guniibuu
Gumala
Grafias
Felixvarela
La Superba
ι1 Scorpii
Hoggar
Ebla
Dombay
δ Arae
Achird
Menkar
Castor B
Sulafat
Wolf 498
Wolf 359
Wezen
Dabih Major
Caph
Deneb
W Virginis
Capella
ι Canis Majoris
Canopus
ρ Cygni
van Maanen's Star
BZ Crucis
Deneb Algedi
Yed Prior
Meissa
Polaris
Antares
Proxima Centauri
δ Andromedae
Lalande 18115
15 Orionis
KX Librae
ζ Trianguli Australis
Arneb
Kitalpha
Suhail
δ Circini
δ Pavonis
σ Orionis
π5 Orionis
Zaniah
Ran
Mebsuta
UV Ceti
HR 7687
Rigel
Brachium
Alnilam
Alkarab
Tarazed
Almaaz
Sham
Gliese 536
WX Ursae Majoris
Naos
Sargas
Alnitak
Sadr
Gliese 412 A
Teegarden's Star
Azmidi
Barnard's Star
Schedar
ε Reticuli
ν2 Canis Majoris
τ Ceti
Saiph
Enif
α Telescopii
Sun
α Centauri A
λ Leporis
Mira
Ross 154
Alchiba
HO Librae
Unurgunite
Mirfak
η Carinae
Avior
Tureis
Sirius
Betelgeuse
Hatysa
Aspidiske
FI Virginis
ο Capricorni B
Alherem
Atria
Sirius B
Achernar

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

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