Assuming an age of 23 ± 3 million years, PSO J318.5-22 is estimated to have 8.3 ± 0.5 times the mass of Jupiter, an effective temperature of about 1127 K, and ~1.46 times the size of Jupiter. Interestingly, the gravity on PSO J318.5-22 is only slightly stronger than the surface gravity on Earth. Observations also indicate that the rotation period of PSO J318.5-22 is 5 to 10.2 hours, somewhat longer than the typical ~3 hour rotation periods of substellar objects that are similar in temperature to PSO J318.5-22. This is expected as PSO J318.5-22 is a young object and is still in the process of contracting.
Allers et al. (2016), “The Radial and Rotational Velocities of PSO J318.5338-22.8603, a Newly Confirmed Planetary-Mass Member of the β Pictoris Moving Group”, arXiv:1601.04717 [astro-ph.SR]