RA 48.5222° · Dec 59.5635° · star
25 more points to reach Anomaly.
HD 19820 is an epic variable star. It lies about 1,863.7 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 7.13 and has spectral type O9IV.
Its spectrum reads O9IV — 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 19820 in the constellation Cas. At apparent magnitude 7.13, it is an easy target for binoculars.
Like any astronomical target, HD 19820 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 19820 scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.
That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), Never sets (northern circumpolar), Blazing O-type star, Subgiant (leaving the main sequence), Gently 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.