RA 89.4986° · Dec 25.9539° · star
19 more points to reach Anomaly.
139 Tau is an epic star. It lies about 1,553.1 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 4.81 and has spectral type B1Ib.
Its spectrum reads B1Ib — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
Look for 139 Tau in the constellation Tau. At apparent magnitude 4.81, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 139 Tau 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.
139 Tau 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 8 science badges — Star, Distant (over 1,000 light-years), Naked-eye visible, On the zodiac, Hot blue B-type star, Supergiant, 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.