RA 244.3769° · Dec 75.7553° · star
8 more points to reach Rare.
21Eta UMi is an uncommon star. It lies about 97 light-years from Earth, sits in the constellation UMi, shines at apparent magnitude 4.95 and has spectral type F5V.
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 21Eta UMi in the constellation UMi. At apparent magnitude 4.95, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 21Eta UMi 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.
21Eta UMi 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 6 science badges — Star, Naked-eye visible, Binary star, Never sets (northern circumpolar), Yellow-white F-type star and Main-sequence 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.