RA 357.4713° · Dec 62.2141° · star
4 more points to reach Rare.
HD 223501 is an uncommon variable star. It lies about 2,131.7 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 7.74 and has spectral type B2Vn(e).
Its spectrum reads B2Vn(e) — 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 223501 in the constellation Cas. At apparent magnitude 7.74, it is an easy target for binoculars.
Like any astronomical target, HD 223501 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 223501 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.
That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), Never sets (northern circumpolar), Hot blue B-type star, Main-sequence star, Gently variable 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.