RA 38.9450° · Dec 34.6876° · star
4 more points to reach Rare.
15 Tri is an uncommon star. It lies about 632.1 light-years from Earth, sits in the constellation Tri, shines at apparent magnitude 5.38 and has spectral type M3III.
Its spectrum reads M3III — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.
Look for 15 Tri in the constellation Tri. At apparent magnitude 5.38, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 15 Tri 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 Tri scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Naked-eye visible, Cool red M-type star, Giant star and Deep red 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.