RA 70.4307° · Dec 22.7316° · star
5 more points to reach Uncommon.
HIP 21840 is a common star. It lies about 512.8 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 8.73 and has spectral type K7.
Its spectrum reads K7 — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
Look for HIP 21840 in the constellation Tau. At apparent magnitude 8.73, it is an easy target for binoculars.
Like any astronomical target, HIP 21840 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.
HIP 21840 scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, On the zodiac, Orange K-type star and Deep red 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.