RA 269.7386° · Dec -22.5175° · star
10 more points to reach Epic.
HD 163800 is a rare star. It sits in the constellation Sgr, shines at apparent magnitude 7 and has spectral type O7/O8.
Its spectrum reads O7/O8 — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.
Look for HD 163800 in the constellation Sgr. At apparent magnitude 7, it is an easy target for binoculars.
Like any astronomical target, HD 163800 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 163800 scores 40 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, Toward the galactic centre, On the zodiac and Blazing O-type 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.