Star profile
21 Arietis
What is 21 Arietis
21 Arietis is a yellow-white F-type star 167 light-years away, set in Aries, one of the oldest zodiacal figures of the heavens. It is slightly hotter than the Sun, just enough to push its colour toward a white barely tinted with gold. For the Babylonians, Aries marked the start of the astronomical year when the equinox fell within it —precession has long since carried that point away.
Where it is and when to see it
21 Arietis lies in the northern 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.
It opens in your browser. Free, no account, nothing to install.
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
If you don't have an account yet, we'll ask for an email to confirm it's you: we send you a link and that's it, no password.
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 Arietis
- Constellation
- Aries
- Apparent magnitude
- 5.57
- Distance
- 166.6 light years
- Coordinates (J2000)
- RA 33.928° · Dec 25.043°
- Catalogue
- HIP 10535 · HD 13872
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Aries
Aries has 57 stars in Stelvia's catalogue. Here are a few of them.
- HamalAlpha Arietis2.01
- SheratanBeta Arietis2.64
- Bharani3.61
- 64 Arietis5.50
- Sigma Arietis5.52
- 62 Arietis5.55
- Theta Arietis5.58
- Rho 3 Arietis5.58