RA 182.7497° · Dec -57.7424° · star
4 more points to reach Uncommon.
HD 105840 is a common star. It lies about 865.1 light-years from Earth, sits in the constellation Cru, shines at apparent magnitude 9.28 and has spectral type A0V.
Its spectrum reads A0V — 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 105840 in the constellation Cru. At apparent magnitude 9.28, a small backyard telescope will bring it into view.
Like any astronomical target, HD 105840 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 105840 scores 18 points on Spacedle's rarity scale, which places it in the common tier. Another 4 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Under the Southern Cross, 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.