RA 10.7086° · Dec 64.2913° · star
11 more points to reach Epic.
HD 3940 is a rare variable star. It sits in the constellation Cas, shines at apparent magnitude 7.28 and has spectral type A1Ia.
Its spectrum reads A1Ia — 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 3940 in the constellation Cas. At apparent magnitude 7.28, it is an easy target for binoculars.
Like any astronomical target, HD 3940 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 3940 scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.
That score comes from 6 science badges — Variable star, Never sets (northern circumpolar), White A-type star, Supergiant, Gently variable and A named variable 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.