RA 233.9653° · Dec 35.9236° · star
7 more points to reach Common.
HD 139243 is a trash star. It lies about 566.2 light-years from Earth, sits in the constellation CrB, shines at apparent magnitude 8.27 and has spectral type A2.
Its spectrum reads A2 — 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 139243 in the constellation CrB. At apparent magnitude 8.27, it is an easy target for binoculars.
Like any astronomical target, HD 139243 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 139243 scores 8 points on Spacedle's rarity scale, which places it in the trash tier. Another 7 points would lift it into a rarer tier.
That score comes from 2 science badges — Star and White A-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.