RA 111.1152° · Dec 15.5172° · star
6 more points to reach Epic.
HR 2817 is a rare variable star. It lies about 3,166.6 light-years from Earth, sits in the constellation Gem, shines at apparent magnitude 6.47 and has spectral type B2Ve.
Its spectrum reads B2Ve — 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 2817 in the constellation Gem. At apparent magnitude 6.47, it is an easy target for binoculars.
Like any astronomical target, HR 2817 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 2817 scores 44 points on Spacedle's rarity scale, which places it in the rare tier. Another 6 points would lift it into a rarer tier.
That score comes from 9 science badges — Variable star, Distant (over 1,000 light-years), On the zodiac, Hot blue B-type star, Main-sequence star, Blue-white star, Intrinsically luminous (Mv < −2) and Gently variable — 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.