RA 137.6617° · Dec 30.9631° · star
2 more points to reach Epic.
HR 3639 is a rare variable star. It lies about 467.9 light-years from Earth, sits in the constellation Cnc, shines at apparent magnitude 6.04 and has spectral type M6S.
Its spectrum reads M6S — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.
Look for HR 3639 in the constellation Cnc. At apparent magnitude 6.04, it is an easy target for binoculars.
Like any astronomical target, HR 3639 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 3639 scores 48 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.
That score comes from 7 science badges — Variable star, On the zodiac, Cool red M-type star, Red dwarf, Strongly variable, Fades out of naked-eye view 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.