PSO J318.5-22

PSO J318.5-22

Exoplanet		List of exoplanets
Physical characteristics
Mass	(m)	6.5 MJ
Radius	(r)	1.53 RJ
Temperature	(T)	1160+30 −40 K
Discovery information
Discovery date
Discoverer(s)
Discovery method		Direct imaging
Discovery site		Pan-STARRS PS1 telescope, Haleakalā
Discovery status		Published
Other designations
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

PSO J318.5-22 is a rogue planet, an extrasolar object of planetary mass that does not appear to have a host star. It is approximately 80 light-years away, and belongs to the Beta Pictoris moving group. The object was discovered in 2013 in images taken by the Pan-STARRS PS1 wide-field telescope. PSO J318.5-22's age is inferred to be 12 million years, the same age as the Beta Pictoris group.

The team leader, Michael Liu of the Institute for Astronomy at the University of Hawaii, stated: “We have never before seen an object free-floating in space that looks like this. It has all the characteristics of young planets found around other stars, but it is drifting out there all alone." Current theories about such objects include the possibility that gravitational perturbations may have kicked them out of their planetary systems soon after they formed through planetary accretion, or they may have been formed by some other means. Estimated temperatures inside its clouds exceed 800 °C. The clouds, made of hot dust and molten iron, show how ubiquitous clouds are in planets and planet-like objects.

See also

• 2MASS J1119–1137