phys0001_chapter09

phys0001_chapter09 - Chapter 9 Jovian Planets Jovian...

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Chapter 9 Jovian Planets Jovian planets or Jupiter-like planets are Jupiter, Saturn, Uranus and Neptune. Most of their masses are gases and they are big. Jupiter Saturn Uranus Neptune Diameter (Earth=1) 11.2 9.4 4.0 3.9 Mass ratio (Earth=1) 317.9 95.2 14.5 17.2 Density (Water=1) 1.3 0.7 1.3 1.8 Revolution period 11.9 years 29.4 years 83.8 years 163.7 years Sidereal rotation period 10 hours 10.7 hours 17.2 hours 16.1 hours No. of satellites* 63 60 27 13 * Number of satellites found as in Aug 2007. Jupiter Jupiter is the largest and most massive planet in our solar system. It is almost completely made up of gases. The rotational period of Jupiter is about 10 hours, and such a high velocity flattens Jupiter at the two poles. The mass of Jupiter is about 300 times that of the Earth, however its density is low. In fact, these are general features of Jovian planets. Jupiter is mainly made up of hydrogen, helium , and a small amount of methane and ammonia. The atmospheric pressure is extremely high, over 1000 times than that of the Earth. Because of the great pressure, the core of Jupiter is made up of metallic hydrogen . The rapid rotation of such metallic core explains the strong
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phys0001_chapter09 - Chapter 9 Jovian Planets Jovian...

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