RA 332.9108° · Dec 52.4300° · star
15 more points to reach Anomaly.
HD 210809 is an epic star. It lies about 2,861 light-years from Earth, sits in the constellation Lac, shines at apparent magnitude 7.56 and has spectral type O9Ib.
Its spectrum reads O9Ib — 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 210809 in the constellation Lac. At apparent magnitude 7.56, it is an easy target for binoculars.
Like any astronomical target, HD 210809 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 210809 scores 63 points on Spacedle's rarity scale, which places it in the epic tier. Another 15 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Distant (over 1,000 light-years), Blazing O-type star, Supergiant and Intrinsically luminous (Mv < −2) — 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.