List of presumable moons of Saturn, as given in a Scientific American article around 1982 # Moon Disc r[km] Period[d] Dia[km] --------------------------------------------------------------------- 1980S35 1980 118,200 0.48 10 1980S36 1980 118,300 0.48 15 (Encke Gap Moonlet) 1980 133,600 0.58 10 XV Atlas (1980S28) 1980 137,700 0.60 [40] XVI Prometheus (1980S27) 1980 139,400 0.61 [140] XVII Pandora (1980S26) 1980 141,700 0.63 [110] XI Epimetheus (1980S3) ?1966 151,400 0.69 [140] X Janus (1980S1) ?1966 151,500 0.69 [220] I Mimas 1789 185,500 0.94 396 1980S12 1980 185,500 0.94 10 - 1981 210,000 1.14 3 II Enceladus 1789 238,000 1.37 506 III Tethys 1684 294,700 1.89 1050 XIII Telesto (1980S13) 1980 294,700 1.89 34 XIV Calypso (1980S25) 1980 294,700 1.89 34 1981S10 1981 349,500 2.44 12 IV Dione 1684 377,400 2.74 1120 XII Helene (1980S6) 1980 377,400 2.74 36 1981S7 1981 377,400 2.74 15 1981S9 1981 470,000 3.8 15 V Rhea 1672 527,000 4.52 1530 VI Titan 1655 1,222,000 15.95 5150 VII Hyperion 1848 1,481,000 21.28 [400] VIII Japetus 1671 3,561,000 79.33 1436 IX Phoebe 1898 12,952,000 -550.48 220 Note: At that time, Saturn was considered to have 25 known moons. Later, at least until the mid-1990s, many astronomers considered only 18 of them as real. Various discovery reports, both in the Voyager image data and from various Earth-bound and near-Earth observations, have been issued since, but mostly were not generally accepted. Worked up by H. Frommert href="http://spider.seds.org/ Last Updated: 5-Feb-2001