RA 278.6578° · Dec -36.7413° · star
3 more points to reach Uncommon.
HD 171138 is a common star. It lies about 643.3 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 9.91 and has spectral type F5V.
Its spectrum reads F5V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HD 171138 in the constellation Sgr. At apparent magnitude 9.91, a small backyard telescope will bring it into view.
Like any astronomical target, HD 171138 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 171138 scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 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 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.