text: what are the main astronomical and physical qualities of saturn?   it has a diameter of 120,540 km and has 7 major rings composed of mostly ice and rock. there are 18 named satellites that orbit saturn, but countless more that have yet to be named. the most famous is probably titan. it's atmosphere is made up of hydrogen along with hydrogen-based gases, such as ammonia and methane, and hydrocarbons, such as acetylene and ethane. i am not sure of it's mass but i am aware that it is about 90 times that of earth's.