RA 154.1868° · Dec 19.8913° · exoplanet
3 more points to reach Rare.
BD+20 2457 b is an uncommon exoplanet. It lies about 5,021.9 light-years from Earth, shines at apparent magnitude 9.74, has spectral type K2 II and has an equilibrium temperature near 1,160 K.
Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
At apparent magnitude 9.74, a small backyard telescope will bring it into view.
Like any astronomical target, BD+20 2457 b 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.
BD+20 2457 b scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Hot Jupiter and Multi-planet system — 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.