Several ships entering the atmosphere of a class J gas giant

The USS Defiant in the atmosphere of a 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 USS Defiant 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. (DS9: "Starship Down")

According to Geoffrey Mandel's Star Trek: Star Charts, gas giants have an age ranging from two to ten billion years and a diameter between fifty thousand and one hundred and forty thousand kilometers. They are located within the "cold zone" of a star system. A Class J gas giant is characterized by a tenuous surface, consisting of gaseous hydrogen and some hydrogen compounds, and an atmosphere consisting of zones that vary in temperature and composition. The only known lifeforms to be found on J-class planets are hydrocarbon-based. Examples of Class J gas giants include Jupiter and Saturn.

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