RA 172.1133° · Dec -66.4893° · star
7 more points to reach Rare.
HD 99857 is an uncommon star. It sits in the constellation Mus, shines at apparent magnitude 7.5 and has spectral type B1Ib.
Its spectrum reads B1Ib — 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 99857 in the constellation Mus. At apparent magnitude 7.5, it is an easy target for binoculars.
Like any astronomical target, HD 99857 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 99857 scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Hot blue B-type star and Supergiant — 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.