RA 100.2444° · Dec 9.8958° · star
19 more points to reach Anomaly.
15 Mon is an epic variable star. It lies about 918.7 light-years from Earth, sits in the constellation Mon, shines at apparent magnitude 4.66 and has spectral type O7.
Its spectrum reads O7 — 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 15 Mon in the constellation Mon. At apparent magnitude 4.66, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 15 Mon 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.
15 Mon scores 59 points on Spacedle's rarity scale, which places it in the epic tier. Another 19 points would lift it into a rarer tier.
That score comes from 7 science badges — Variable star, Naked-eye visible, Blazing O-type star, Blue-white star, Intrinsically luminous (Mv < −2), Barely variable (under 0.05 mag) 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.