RA 71.3756° · Dec -3.2547° · star
6 more points to reach Epic.
57Mu Eri is a rare variable star. It lies about 521.8 light-years from Earth, sits in the constellation Eri, shines at apparent magnitude 4.01 and has spectral type B5IV.
Its spectrum reads B5IV — 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 57Mu Eri in the constellation Eri. At apparent magnitude 4.01, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 57Mu Eri 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.
57Mu Eri scores 44 points on Spacedle's rarity scale, which places it in the rare tier. Another 6 points would lift it into a rarer tier.
That score comes from 8 science badges — Variable star, Naked-eye visible, Hot blue B-type star, Subgiant (leaving the main sequence), 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.