RA 344.6658° · Dec 63.0771° · star
9 more points to reach Rare.
HD 217312 is an uncommon variable star. It sits in the constellation Cep, shines at apparent magnitude 7.43 and has spectral type B0IV.
Its spectrum reads B0IV — 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 217312 in the constellation Cep. At apparent magnitude 7.43, it is an easy target for binoculars.
Like any astronomical target, HD 217312 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 217312 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.
That score comes from 6 science badges — Variable star, Never sets (northern circumpolar), Hot blue B-type star, Subgiant (leaving the main sequence), Barely variable (under 0.05 mag) and A named 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.