RA 144.2716° · Dec 81.3263° · exoplanet
13 more points to reach Epic.
HD 81817 b is a rare exoplanet. It lies about 877.8 light-years from Earth, shines at apparent magnitude 4.26, has spectral type K3 III and has an equilibrium temperature near 1,016 K.
Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
At apparent magnitude 4.26, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, HD 81817 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.
HD 81817 b scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Multi-planet system and Its star is visible to the naked eye — 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.