RA 78.1095° · Dec 16.6841° · openngc
9 more points to reach Rare.
NGC 1817 is an uncommon cluster. It lies about 5,919.3 light-years from Earth, sits in the constellation Tau and shines at apparent magnitude 7.7.
An open cluster: a few hundred stars born together out of one collapsing cloud, still drifting along in loose formation.
Look for NGC 1817 in the constellation Tau. At apparent magnitude 7.7, it is an easy target for binoculars.
Like any astronomical target, NGC 1817 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 1817 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.
That score comes from 5 science badges — Star cluster, Distant (over 1,000 light-years), Bright deep-sky object, Open cluster and On the zodiac — 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.