RA 48.7305° · Dec 48.6958° · star
4 more points to reach Common.
HD 20017 is a trash star. It sits in the constellation Per, shines at apparent magnitude 7.9 and has spectral type B5Ve.
Its spectrum reads B5Ve — 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 20017 in the constellation Per. At apparent magnitude 7.9, it is an easy target for binoculars.
Like any astronomical target, HD 20017 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 20017 scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Hot blue B-type star and Main-sequence 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.