RA 111.6717° · Dec 11.0088° · star
2 more points to reach Rare.
HR 2840 is an uncommon star. It lies about 1,336.7 light-years from Earth, sits in the constellation CMi, shines at apparent magnitude 6.39 and has spectral type B7II-III.
Its spectrum reads B7II-III — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
Look for HR 2840 in the constellation CMi. At apparent magnitude 6.39, it is an easy target for binoculars.
Like any astronomical target, HR 2840 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 2840 scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Distant (over 1,000 light-years), Hot blue B-type star, Bright giant and Blue-white 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.