GJ 504b is about four times more massive than Jupiter and has an effective temperature of about 460 degrees Fahrenheit (237 Celsius). It orbits the G0-type star GJ 504, which is slightly hotter than the Sun and is faintly visible to the unaided eye in the constellation Virgo. The star lies 57 light-years away and researchers estimate the system is about 160 million years old, based on methods that link the star's color and rotation period to its age.

Basic data : ICRS coord. (ep=J2000) : 13 16 46.5161591991 +09 25 26.967205938 (Optical) [ 0.2546 0.2235 90 ] A 2018yCat.1345....0G FK4 coord. (ep=B1950 eq=1950) : 13 14 17.5313661252 +09 41 05.655759788 [ 0.2546 0.2235 90 ] Gal coord. (ep=J2000) : 322.7902158083617 +71.3124127191119 [ 0.2546 0.2235 90 ] Proper motions mas/yr : -336.665 190.579 [0.630 0.420 90] A 2018yCat.1345....0G Parallaxes (mas): 57.0186 [0.2524] A 2018yCat.1345....0G