Planet PSO J318.5-22

Detailed information about planet PSO J318.5-22 and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

PSO J318.5-22

Planet Status

Confirmed

Discovered in

2013

Publication Status

Published in a refereed paper

Update

2025-07-28

Mass

7.09 (\pm 1.98)

M_J 1 publication

Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime

Mass*sin(i)

—

Semi-Major Axis

—

Orbital Period

—

Eccentricity

—

Angular distance

—

ω

—

T_peri

—

Radius

1.41 (\pm 0.03)

R_J 1 publication

Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime

Inclination

—

Detection Method

Imaging

Mass Meas. Method

Spectrum

Radius Meas. Method

—

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

1210.0 (\pm 41.0)

K 1 publication

Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

PSO J318.5338-22.8603, 2MASS J21140802-2251358

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference
SiO
SiO	Modeling	Detected				2025 - MOLLIERE P.

Liu et al. (2013) : J=16.7, spectral type = L7 ± 1. For an age = 12_-4⁺⁸ Myr, the temperature = 1160_-40⁺³⁰ K, the radius = 1.53_-0.03^+0.02 R_Jup and the mass = 6.5_-1.0^+1.3 M_Jup.
For an age = 10-100 Myrs, the temperature is 1210_-50⁺⁴⁰ K, the radius is 1.40_-0.4^+0.06 R_Jup and the mass = 12 ± 3 M_Jup.
PSO J318.5-22 is the first free-floating object with the colors, magnitudes, spectrum, luminosity, and mass that overlap the young dusty planets around HR 8799 and 2MASS J1207-39.
Liu et al. (2024) update the age for PSO J318.5-22 to 22 ± 6 Myrs. Spectral type L7.5.