RA 234.0440° · Dec -58.8045° · star
7 more points to reach Common.
HD 138640 is a trash star. It lies about 459.4 light-years from Earth, sits in the constellation Nor, shines at apparent magnitude 9.59 and has spectral type F7Vw....
Its spectrum reads F7Vw... — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HD 138640 in the constellation Nor. At apparent magnitude 9.59, a small backyard telescope will bring it into view.
Like any astronomical target, HD 138640 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 138640 scores 8 points on Spacedle's rarity scale, which places it in the trash tier. Another 7 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Yellow-white F-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.