RA 173.3378° · Dec 26.5749° · star
2 more points to reach Common.
HD 100405 is a trash star. It lies about 2,145.8 light-years from Earth, sits in the constellation Leo, shines at apparent magnitude 10.03 and has spectral type A2.
HD 100405 is a trash star worth 13 points across 2 science badges. Explore its facts, badges and place on the sky map, then add it to your dex on Spacedle.
Look for HD 100405 in the constellation Leo. At apparent magnitude 10.03, a small backyard telescope will bring it into view.
Like any astronomical target, HD 100405 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 100405 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 2 science badges — Star and Distant (>1000 ly) — 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.