RA 155.8603° · Dec -4.0740° · star
5 more points to reach Rare.
25 Sex is an uncommon variable star. It lies about 339.7 light-years from Earth, sits in the constellation Sex, shines at apparent magnitude 5.93 and has spectral type B9p Si(CrSr).
Its spectrum reads B9p Si(CrSr) — 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 25 Sex in the constellation Sex. At apparent magnitude 5.93, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 25 Sex 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.
25 Sex scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.
That score comes from 6 science badges — Variable star, Naked-eye visible, Hot blue B-type star, Blue-white star, 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.