RA 213.9154° · Dec 19.1824° · star
9 more points to reach Epic.
Arcturus is a rare star. It lies about 36.7 light-years from Earth, sits in the constellation Boo, shines at apparent magnitude -0.05 and has spectral type K2IIIp.
Notable enough to have earned a proper name, not just a catalogue number.
Look for Arcturus in the constellation Boo. At apparent magnitude -0.05, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, Arcturus 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.
Arcturus scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Naked-eye visible, Brilliant (mag < 1) and Has a proper name — 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.