RA 319.4887° · Dec -17.9851° · star
13 more points to reach Epic.
30 Cap is a rare star. It lies about 533.8 light-years from Earth, sits in the constellation Cap, shines at apparent magnitude 5.4 and has spectral type B5II/III.
Its spectrum reads B5II/III — 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 30 Cap in the constellation Cap. At apparent magnitude 5.4, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 30 Cap 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.
30 Cap scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.
That score comes from 6 science badges — Star, Naked-eye visible, On the zodiac, Hot blue B-type star, Bright giant 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.