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

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

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