RA 173.9169° · Dec 69.5726° · star
7 more points to reach Uncommon.
HD 100640 is a common star. It lies about 568.2 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 7.66 and has spectral type G5.
Its spectrum reads G5 — a G-type star: the very same spectral class as our own Sun.
Look for HD 100640 in the constellation Dra. At apparent magnitude 7.66, it is an easy target for binoculars.
Like any astronomical target, HD 100640 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 100640 scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Never sets (northern circumpolar) and Sun-like G-type 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.