RA 139.4640° · Dec 11.5011° · star
6 more points to reach Uncommon.
HR 3689 is a common star. It lies about 644.6 light-years from Earth, sits in the constellation Cnc, shines at apparent magnitude 6.4 and has spectral type A2IV.
Its spectrum reads A2IV — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
Look for HR 3689 in the constellation Cnc. At apparent magnitude 6.4, it is an easy target for binoculars.
Like any astronomical target, HR 3689 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 3689 scores 16 points on Spacedle's rarity scale, which places it in the common tier. Another 6 points would lift it into a rarer tier.
That score comes from 4 science badges — Star, On the zodiac, White A-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.