RA 183.0916° · Dec -62.9508° · star
7 more points to reach Epic.
HR 4644 is a rare star. It sits in the constellation Cru, shines at apparent magnitude 5.91 and has spectral type B9Ia.
Its spectrum reads B9Ia — 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 4644 in the constellation Cru. At apparent magnitude 5.91, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, HR 4644 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 4644 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 5 science badges — Star, Naked-eye visible, Under the Southern Cross, Hot blue B-type star and Supergiant — 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.