RA 173.3981° · Dec 55.5821° · star
6 more points to reach Uncommon.
HD 100403 is a common star. It lies about 746.4 light-years from Earth, sits in the constellation UMa, shines at apparent magnitude 7.88 and has spectral type K0III.
Its spectrum reads K0III — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
Look for HD 100403 in the constellation UMa. At apparent magnitude 7.88, it is an easy target for binoculars.
Like any astronomical target, HD 100403 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 100403 scores 16 points on Spacedle's rarity scale, which places it in the common tier. Another 6 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Never sets (northern circumpolar), Orange K-type star and Giant 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.