RA 38.3064° · Dec 59.9995° · star
5 more points to reach Uncommon.
HD 15640 is a common star. It lies about 795.5 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 7.61 and has spectral type A0IV.
Its spectrum reads A0IV — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
Look for HD 15640 in the constellation Cas. At apparent magnitude 7.61, it is an easy target for binoculars.
Like any astronomical target, HD 15640 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 15640 scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Never sets (northern circumpolar), White A-type star and Subgiant (leaving the main sequence) — 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.