RA 69.7173° · Dec 20.7807° · star
6 more points to reach Common.
HIP 21639 is a trash star. It lies about 426.9 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 9.89 and has spectral type F5.
Its spectrum reads F5 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HIP 21639 in the constellation Tau. At apparent magnitude 9.89, a small backyard telescope will bring it into view.
Like any astronomical target, HIP 21639 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 21639 scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, On the zodiac and Yellow-white F-type 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.