RA 58.9101° · Dec 52.6413° · star
10 more points to reach Epic.
HD 24431 is a rare star. It lies about 1,443.2 light-years from Earth, sits in the constellation Per, shines at apparent magnitude 6.74 and has spectral type O9IV-V.
Its spectrum reads O9IV-V — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.
Look for HD 24431 in the constellation Per. At apparent magnitude 6.74, it is an easy target for binoculars.
Like any astronomical target, HD 24431 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 24431 scores 40 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Distant (over 1,000 light-years), Blazing O-type star and Subgiant (leaving the main sequence) — 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.