RA 52.1954° · Dec -59.9767° · star
10 more points to reach Common.
HD 21900 is a trash variable star. It sits in the constellation Ret, shines at apparent magnitude 9.34 and has spectral type M3III.
HD 21900 is a trash variable star worth 5 points across 1 science badge. Explore its facts, badges and place on the sky map, then add it to your dex on Spacedle.
Look for HD 21900 in the constellation Ret. At apparent magnitude 9.34, a small backyard telescope will bring it into view.
Like any astronomical target, HD 21900 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 21900 scores 5 points on Spacedle's rarity scale, which places it in the trash tier. Another 10 points would lift it into a rarer tier.
That score comes from 1 science badge — Variable 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.