RA 234.8135° · Dec 29.6221° · star
9 more points to reach Rare.
HD 139815 is an uncommon variable star. It lies about 679.5 light-years from Earth, sits in the constellation CrB, shines at apparent magnitude 10.23 and has spectral type A8V SB.
Its spectrum reads A8V SB — 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 139815 in the constellation CrB. At apparent magnitude 10.23, a small backyard telescope will bring it into view.
Like any astronomical target, HD 139815 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 139815 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, White A-type star, Main-sequence star, Strongly variable 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.