RA 152.2344° · Dec -51.8113° · star
7 more points to reach Epic.
HR 3990 is a rare star. It lies about 1,331.2 light-years from Earth, sits in the constellation Vel, shines at apparent magnitude 4.85 and has spectral type B3IV.
Its spectrum reads B3IV — 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 HR 3990 in the constellation Vel. At apparent magnitude 4.85, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, HR 3990 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.
HR 3990 scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.
That score comes from 7 science badges — Star, Distant (over 1,000 light-years), Naked-eye visible, Hot blue B-type star, Subgiant (leaving the main sequence), 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.