Star profile
HIP 21972
Hot blue starWhat is HIP 21972
A blue star in Perseus, the hero who slew Medusa. Its light set out 683 years ago, when the Black Death was sweeping Europe and the papacy had moved to Avignon. A B-class star —hot, massive, intensely blue— it shines with vastly more energy than the Sun and will last only a minuscule fraction of the galaxy's age.
Where it is and when to see it
HIP 21972 lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is December: 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
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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 HIP 21972
- Constellation
- Perseus
- Apparent magnitude
- 5.86
- Distance
- 683.9 light years
- Coordinates (J2000)
- RA 70.840° · Dec 49.974°
- Catalogue
- HIP 21972 · HD 29721
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Perseus
Perseus has 99 stars in Stelvia's catalogue. Here are a few of them.
- MirfakAlpha Persei1.79
- AlgolBeta Persei2.09
- Zeta Persei2.84
- HIP 163405.82
- HIP 126865.85
- HIP 133395.86
- HIP 139495.89
- HIP 165185.91