RA 289.4166° · Dec 22.4412° · star
8 more points to reach Rare.
HD 180939 is an uncommon variable star. It lies about 939.9 light-years from Earth, sits in the constellation Vul, shines at apparent magnitude 6.82 and has spectral type B5V SB.
Its spectrum reads B5V SB — 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 180939 in the constellation Vul. At apparent magnitude 6.82, it is an easy target for binoculars.
Like any astronomical target, HD 180939 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 180939 scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, Hot blue B-type star, Main-sequence star, Strongly 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.