RA 54.7547° · Dec -5.6262° · star
6 more points to reach Uncommon.
21 Eri is a common star. It lies about 109.9 light-years from Earth, sits in the constellation Eri, shines at apparent magnitude 5.97 and has spectral type K1V.
Its spectrum reads K1V — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
Look for 21 Eri in the constellation Eri. At apparent magnitude 5.97, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 21 Eri 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 Eri scores 16 points on Spacedle's rarity scale, which places it in the common tier. Another 6 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Naked-eye visible, Orange K-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.