RA 256.3339° · Dec 54.4700° · star
10 more points to reach Rare.
21Mu Dra is an uncommon star. It lies about 89.5 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 4.91 and has spectral type F5.
It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.
Look for 21Mu Dra in the constellation Dra. At apparent magnitude 4.91, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 21Mu Dra 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.
21Mu Dra scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Naked-eye visible, Binary star, Never sets (northern circumpolar) and Yellow-white F-type 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.