RA 339.8153° · Dec 39.0503° · star
18 more points to reach Anomaly.
10 Lac is an epic star. It lies about 1,725.7 light-years from Earth, sits in the constellation Lac, shines at apparent magnitude 4.89 and has spectral type O9V.
Its spectrum reads O9V — 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 10 Lac in the constellation Lac. At apparent magnitude 4.89, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 10 Lac 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.
10 Lac scores 60 points on Spacedle's rarity scale, which places it in the epic tier. Another 18 points would lift it into a rarer tier.
That score comes from 7 science badges — Star, Distant (over 1,000 light-years), Naked-eye visible, Blazing O-type star, Main-sequence star, Blue-white star 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.