RA 111.0238° · Dec -29.3031° · star
37 more points to reach Mythic.
Aludra is an anomaly variable star. It lies about 1,988.8 light-years from Earth, sits in the constellation CMa, shines at apparent magnitude 2.45 and has spectral type B5Ia.
Its spectrum reads B5Ia — 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 Aludra in the constellation CMa. At apparent magnitude 2.45, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, Aludra 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.
Aludra scores 83 points on Spacedle's rarity scale, which places it in the anomaly tier. Another 37 points would lift it into a rarer tier.
That score comes from 10 science badges — Variable star, Distant (over 1,000 light-years), Naked-eye visible, Has a proper name, Hot blue B-type star, Supergiant, Blue-white star and Blindingly luminous (Mv < −5) — 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.