RA 272.5423° · Dec 82.9398° · star
4 more points to reach Uncommon.
HD 170151 is a common star. It lies about 704.4 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 7.43 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 170151 in the constellation Dra. At apparent magnitude 7.43, it is an easy target for binoculars.
Like any astronomical target, HD 170151 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 170151 scores 18 points on Spacedle's rarity scale, which places it in the common tier. Another 4 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Never sets (northern circumpolar), Hot blue B-type star and Blue-white 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.