RA 33.9283° · Dec 25.0430° · star
3 more points to reach Uncommon.
21 Ari is a common star. It lies about 166.6 light-years from Earth, sits in the constellation Ari, shines at apparent magnitude 5.57 and has spectral type F6V.
Its spectrum reads F6V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for 21 Ari in the constellation Ari. At apparent magnitude 5.57, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 21 Ari is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
21 Ari scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Naked-eye visible, On the zodiac, Yellow-white F-type star and Main-sequence star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.