RA 23.3409° · Dec 60.6580° · openngc
8 more points to reach Rare.
NGC 581 is an uncommon cluster. It sits in the constellation Cas and shines at apparent magnitude 7.4.
NGC 581 is a uncommon cluster worth 25 points across 3 science badges. Explore its facts, badges and place on the sky map, then add it to your dex on Spacedle.
Look for NGC 581 in the constellation Cas. At apparent magnitude 7.4, it is an easy target for binoculars.
Like any astronomical target, NGC 581 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.
NGC 581 scores 25 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 cluster, Messier object and Bright deep-sky object — 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.