RA 1.2291° · Dec 58.5322° · star
3 more points to reach Rare.
HD 225257 is an uncommon star. It lies about 2,740.8 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 6.61 and has spectral type B3V.
Its spectrum reads B3V — 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 225257 in the constellation Cas. At apparent magnitude 6.61, it is an easy target for binoculars.
Like any astronomical target, HD 225257 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 225257 scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.
That score comes from 6 science badges — Star, Distant (over 1,000 light-years), Never sets (northern circumpolar), Hot blue B-type star, Main-sequence star and Intrinsically luminous (Mv < −2) — 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.