RA 282.3376° · Dec -36.6354° · star
12 more points to reach Rare.
HD 173891 is an uncommon star. It lies about 669.7 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 8.66 and has spectral type F0/F2IV.
Its spectrum reads F0/F2IV — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HD 173891 in the constellation Sgr. At apparent magnitude 8.66, it is an easy target for binoculars.
Like any astronomical target, HD 173891 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 173891 scores 22 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 12 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Toward the galactic centre, On the zodiac, Yellow-white F-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.