RA 346.8701° · Dec 21.1340° · exoplanet
2 more points to reach Anomaly.
HR 8799 d is an epic exoplanet. It lies about 134.5 light-years from Earth, shines at apparent magnitude 5.98, has spectral type A5 V and has an equilibrium temperature near 1,300 K.
Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.
At apparent magnitude 5.98, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, HR 8799 d 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 8799 d scores 76 points on Spacedle's rarity scale, which places it in the epic tier. Another 2 points would lift it into a rarer tier.
That score comes from 8 science badges — Confirmed exoplanet, Gas giant, Lava world, Long-period world, Eccentric orbit, Multi-planet system, Directly imaged 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.