RA 152.5245° · Dec -12.8159° · star
3 more points to reach Uncommon.
HR 3991 is a common star. It lies about 90.5 light-years from Earth, sits in the constellation Hya, shines at apparent magnitude 5.3 and has spectral type F2/F3IV/V.
Its spectrum reads F2/F3IV/V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HR 3991 in the constellation Hya. At apparent magnitude 5.3, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, HR 3991 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.
HR 3991 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 4 science badges — Star, Naked-eye visible, 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.