Star profile
21 Aquarii
What is 21 Aquarii
21 Aquarii glows orange within the Water-Bearer, the zodiacal figure that pours a river of stars southward, gathered farther on at the mouth of the Southern Fish. It is a K-type giant, far cooler than the Sun yet considerably expanded, a star that has long left the youth of the main sequence behind. From 388 light-years, the light reaching us tonight departed in the early seventeenth century, when telescopes were barely two decades old.
Where it is and when to see it
21 Aquarii lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is August: 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 Aquarii
- Constellation
- Aquarius
- Apparent magnitude
- 5.48
- Distance
- 388.3 light years
- Coordinates (J2000)
- RA 321.321° · Dec -3.557°
- Catalogue
- HIP 105767 · HD 203926
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Aquarius
Aquarius has 99 stars in Stelvia's catalogue. Here are a few of them.
- SadalsuudBeta Aquarii2.90
- SadalmelikAlpha Aquarii2.95
- SkatDelta Aquarii3.27
- 38 Aquarii5.43
- 83 Aquarii5.44
- 18 Aquarii5.48
- 7 Aquarii5.49
- 12 Aquarii5.53