RA 164.3258° · Dec 52.9068° · star
2 more points to reach Common.
HD 233791 is a trash star. It sits in the constellation UMa, shines at apparent magnitude 10.22 and has spectral type B9.
Its spectrum reads B9 — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
Look for HD 233791 in the constellation UMa. At apparent magnitude 10.22, a small backyard telescope will bring it into view.
Like any astronomical target, HD 233791 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 233791 scores 13 points on Spacedle's rarity scale, which places it in the trash tier. Another 2 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Never sets (northern circumpolar) and Hot blue B-type 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.