Class J gas giant
In the Federation standard system of planetary classification, a class J gas giant  was a type of planet. 

In 2372, the  entered the atmosphere of a Class J gas giant to rescue the crew of a Karemma ship. The Karemma were attempting to escape from two Jem'Hadar attack ships. The atmosphere had wind speeds of over ten thousand kilometers per hour. This planet also had fluorine gas in its atmosphere. ()

The Laap system contained two class J gas giants. ()

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Celestial objects