RA 51.8197° · Dec -61.2591° · star
7 more points to reach Uncommon.
HD 21765 is a common variable star. It lies about 343.7 light-years from Earth, sits in the constellation Ret, shines at apparent magnitude 7.89 and has spectral type F5V.
Its spectrum reads F5V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HD 21765 in the constellation Ret. At apparent magnitude 7.89, it is an easy target for binoculars.
Like any astronomical target, HD 21765 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 21765 scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, Yellow-white F-type star, Main-sequence star, Barely variable (under 0.05 mag) and A named variable 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.