RA 272.3237° · Dec -23.9884° · star
9 more points to reach Epic.
HD 165921 is a rare variable star. It lies about 1,496.1 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 7.32 and has spectral type B6III:.
Its spectrum reads B6III: — 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 165921 in the constellation Sgr. At apparent magnitude 7.32, it is an easy target for binoculars.
Like any astronomical target, HD 165921 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 165921 scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.
That score comes from 8 science badges — Variable star, Distant (over 1,000 light-years), Toward the galactic centre, On the zodiac, Hot blue B-type star, Giant star, Gently 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.