RA 33.4234° · Dec 58.5606° · star
8 more points to reach Rare.
HR 641 is an uncommon star. It sits in the constellation Per, shines at apparent magnitude 6.43 and has spectral type A3Iab.
Its spectrum reads A3Iab — 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 HR 641 in the constellation Per. At apparent magnitude 6.43, it is an easy target for binoculars.
Like any astronomical target, HR 641 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.
HR 641 scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, White A-type star and Supergiant — 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.