RA 208.3023° · Dec -31.9276° · star
7 more points to reach Rare.
4 Cen is an uncommon star. It lies about 637 light-years from Earth, sits in the constellation Cen, shines at apparent magnitude 4.75 and has spectral type B4IV.
Its spectrum reads B4IV — 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 4 Cen in the constellation Cen. At apparent magnitude 4.75, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 4 Cen 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.
4 Cen scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Naked-eye visible, Hot blue B-type star, Subgiant (leaving the main sequence) and Blue-white 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.