RA 51.3497° · Dec 31.7311° · star
2 more points to reach Uncommon.
HD 21110 is a common star. It lies about 789.7 light-years from Earth, sits in the constellation Per, shines at apparent magnitude 7.31 and has spectral type K4III-IV.
Its spectrum reads K4III-IV — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
Look for HD 21110 in the constellation Per. At apparent magnitude 7.31, it is an easy target for binoculars.
Like any astronomical target, HD 21110 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.
HD 21110 scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Orange K-type star, Giant star and Deep red 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.