RA 113.6495° · Dec 31.8883° · star
15 more points to reach Epic.
Castor is a rare star. It lies about 50.9 light-years from Earth, sits in the constellation Gem, shines at apparent magnitude 1.58 and has spectral type A2Vm.
It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.
Look for Castor in the constellation Gem. At apparent magnitude 1.58, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, Castor 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.
Castor scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.
That score comes from 7 science badges — Star, Naked-eye visible, Binary star, Has a proper name, On the zodiac, White A-type star and Main-sequence 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.