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

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

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