RA 279.4151° · Dec -42.9555° · star
2 more points to reach Uncommon.
HD 171577 is a common variable star. It lies about 562.3 light-years from Earth, sits in the constellation CrA, shines at apparent magnitude 7.74 and has spectral type B9V.
Its spectrum reads B9V — 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 HD 171577 in the constellation CrA. At apparent magnitude 7.74, it is an easy target for binoculars.
Like any astronomical target, HD 171577 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.
HD 171577 scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, Hot blue B-type star, Main-sequence star, Gently variable 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.