RA 136.2868° · Dec -72.6027° · star
8 more points to reach Rare.
HR 3643 is an uncommon star. It lies about 400.7 light-years from Earth, sits in the constellation Car, shines at apparent magnitude 4.47 and has spectral type F6II-III.
Its spectrum reads F6II-III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Look for HR 3643 in the constellation Car. At apparent magnitude 4.47, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, HR 3643 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 3643 scores 26 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 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 Bright giant — 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.