RA 317.3942° · Dec 45.7385° · star
2 more points to reach Rare.
HD 201666 is an uncommon star. It lies about 2,836.1 light-years from Earth, sits in the constellation Cyg, shines at apparent magnitude 7.66 and has spectral type B2Vn....
Its spectrum reads B2Vn... — 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 201666 in the constellation Cyg. At apparent magnitude 7.66, it is an easy target for binoculars.
Like any astronomical target, HD 201666 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 201666 scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.
That score comes from 6 science badges — Star, Distant (over 1,000 light-years), Hot blue B-type star, Main-sequence star, Blue-white star and Intrinsically luminous (Mv < −2) — 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.