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Abbreviation: Eri |
English Name: The River |
Genitive: Achernar |
Hemisphere: Southern Hemisphere (Never visible from the UK.) |
Location: Between the constellations of Lepus and Cetus. |
Visible between latitudes: +60 and -90 degrees |
Best season: Winter |
Seen in three seasons: Autumn, Winter and Spring |
Best seen in: November and January |
Seen between: November and January |
Right Ascension (RA): 03 hour |
Declination (DEC): -20 degrees |
Area (square degrees): 1,138 (6th) |
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Eridanus (The River)
- Long rambling constellation extends for nearly 60 degrees from north to south – the greatest range in declination (DEC) of any constellation that starts Cursa star in Eridanus; from the left foot of Orion in the north then eventually ends far to the south, at the border with Hydrus, where is the brightest star of Eridanus (Achernar) there.
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Messier Objects in Eridanus
No Messier objects in Eridanus |
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Features of Interest
- NGC 1535 – planetary nebula; very similar to Eskimo Nebula in Gemini (NGC 2392), bluish double-shell structure.
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Named Stars
- Achernar (Alpha Eri)
- Cursa (Beta Eri)
- Zaurak (Gamma Eri)
- Rana (Delta Eri)
- Zibal (Zeta Eri)
- Azha (Eta Eri)
- Acamar (Theta 1 Eri)
- Beid (Omicron 1 Eri)
- Keid (Omicron 2 Eri)
- Angetenar (Tau 2 Eri)
- Theemim (Upsilon 2 Eri)
- Sceptrum (53 Eri)
- more list of stars in Eridanus
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IAU Sky Chart: Eridanus

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Andromeda | Aquarius | Aquila | Aries | Auriga | ||
Boötes | Camelopardalis | Cancer | Canes Venatici | Canis Major | ||
Capricornus | Cassiopeia | Cephus | Coma Berenices | Corona Borealis | ||
Cygnus | Delphinus | Draco | Equuleus | Gemini | ||
Hercules | Lacerta | Leo | Leo Minor | Lynx | ||
Lyra | Monoceros | Ophiuchus | Orion | Pegasus | ||
Perseus | Pisces | Sagitta | Serpens | Sextans | ||
Taurus | Triangulum | Ursa Major | Ursa Minor | Virgo | ||
Vulpecula |
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