RA 174.1705° · Dec -9.8022° · star
10 more points to reach Rare.
21The Crt is an uncommon star. It lies about 280.4 light-years from Earth, sits in the constellation Crt, shines at apparent magnitude 4.7 and has spectral type B9.5Vn.
Its spectrum reads B9.5Vn — 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 21The Crt in the constellation Crt. At apparent magnitude 4.7, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 21The Crt 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.
21The Crt scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Naked-eye visible, Hot blue B-type star, Main-sequence star and Blue-white 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.