RA 282.2038° · Dec -18.6322° · star
1 more point to reach Uncommon.
HD 173940 is a common star. It lies about 918.7 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 7.22 and has spectral type A2V.
Its spectrum reads A2V — 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 173940 in the constellation Sgr. At apparent magnitude 7.22, it is an easy target for binoculars.
Like any astronomical target, HD 173940 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 173940 scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.
That score comes from 5 science badges — Star, Toward the galactic centre, On the zodiac, White A-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.