Sub-Jupiter (M-Class III, symbol Jc, slogan: medium high-mass planet), also known as subjovian planet or saturnian planet, is a classification of planet with mass ranging from 0.1 to 0.5 Jupiter masses or 31.7832 to 158.916 Earth masses.
Sub-Jupiters are gaseous with no solid surface, but there is a rocky core surrounded by liquid hydrogen-helium mixtures in their mantles. The atmospheres would contain one to several featured storms. Sub-Jupiters orbiting closer to their stars would have more violent storms and stronger winds than those orbiting further out. Their radius can range from 0.5 RJ to 1.3 RJ depending on composition and heat distribution.
There are an estimated 65 billion sub-Jupiters in our galaxy alone, making it the third least abundant mass class of planet after super-Jupiter and mid-Jupiter. This corresponds that 79‰ of all 820 billion planets in our galaxy are sub-Jupiters.
Known sub-Jupiters Edit
As of February 2014, about 120 sub-Jupiters are identified, including the ringed planet Saturn (Sol g, P6, 0.299 MJ). Notable examples of extrasolar sub-Jupiters are Diomedes (HD 164922 b, P182, 0.371 MJ), Odysseus (79 Ceti b, P35, 0.282 MJ), Dejanira (HD 46375 b, P34, 0.237 MJ), which is the first sub-Jupiter exoplanet discovered on March 29, 2000, and Stygne (55 Cancri f, P142, 0.190 MJ).