RA 279.5003° · Dec 8.0007° · star
7 more points to reach Uncommon.
HD 172101 is a common star. It lies about 1,524.1 light-years from Earth, sits in the constellation Oph, shines at apparent magnitude 8.94 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 172101 in the constellation Oph. At apparent magnitude 8.94, it is an easy target for binoculars.
Like any astronomical target, HD 172101 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 172101 scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Distant (over 1,000 light-years) and Hot blue B-type 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.