RA 52.4274° · Dec 16.7623° · star
6 more points to reach Uncommon.
HD 21590 is a common star. It lies about 540 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 7.05 and has spectral type A0p.
Its spectrum reads A0p — 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 HD 21590 in the constellation Tau. At apparent magnitude 7.05, it is an easy target for binoculars.
Like any astronomical target, HD 21590 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.
HD 21590 scores 16 points on Spacedle's rarity scale, which places it in the common tier. Another 6 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, On the zodiac, White A-type star and Blue-white 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.