Star profile
21 Eridani
What is 21 Eridani
21 Eridani is an orange K-type star only 110 light-years away, among the nearest in its Flamsteed listing within the long river winding from Orion southward. Cooler than the Sun, its light left around 1916, in the depths of the First World War. Eridanus is an enormously extended constellation; this star sits in its northernmost reach, the easiest stretch to follow from European latitudes.
Where it is and when to see it
21 Eridani lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is November: the Sun sits at the opposite point of the sky and the star culminates around midnight. How high it climbs above the horizon depends on the latitude you watch from.
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The signature wall
Stelvia's sky works like a signature wall: anyone can leave their name and a message on a real star, and that signature goes up on the map for everyone to read. Signing is free.
A signature without a lock can be replaced by someone else's. The lock makes the signature permanent and lets you choose a symbolic name for the star, always shown next to the star's catalogue identifier. How the lock works
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A public signature from a real person. The chosen name is a symbolic denomination within Stelvia, with no official standing or IAU recognition: the sky is not for sale and belongs to no one.
Astronomical data for 21 Eridani
- Constellation
- Eridanus
- Apparent magnitude
- 5.97
- Distance
- 109.9 light years
- Coordinates (J2000)
- RA 54.755° · Dec -5.626°
- Catalogue
- HIP 17027 · HD 22713
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Eridanus
Eridanus has 129 stars in Stelvia's catalogue. Here are a few of them.
- AchernarAlpha Eridani0.45
- CursaBeta Eridani2.78
- AcamarTheta 1 Eridani2.88
- HIP 199965.95
- HIP 208925.95
- HIP 210425.95
- 55 Eridani5.98
- HIP 183395.99