RA 269.8159° · Dec -19.5407° · star
6 more points to reach Rare.
HD 163891 is an uncommon variable star. It lies about 845 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 9.07 and has spectral type F7V.
Its spectrum reads F7V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HD 163891 in the constellation Sgr. At apparent magnitude 9.07, a small backyard telescope will bring it into view.
Like any astronomical target, HD 163891 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 163891 scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.
That score comes from 7 science badges — Variable star, Toward the galactic centre, On the zodiac, Yellow-white F-type star, Main-sequence star, Gently variable and A named variable 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.