RA 209.5039° · Dec -53.2037° · star
2 more points to reach Common.
HD 121640 is a trash star. It lies about 815.4 light-years from Earth, sits in the constellation Cen, shines at apparent magnitude 9.16 and has spectral type A9/F0IV/V.
Its spectrum reads A9/F0IV/V — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
Look for HD 121640 in the constellation Cen. At apparent magnitude 9.16, a small backyard telescope will bring it into view.
Like any astronomical target, HD 121640 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 121640 scores 13 points on Spacedle's rarity scale, which places it in the trash tier. Another 2 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, White A-type star and Subgiant (leaving the main sequence) — 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.