Satellites of the Planets


                                         Radius of    Period of      Diameter
Planet    Satellite    Discovery         Orbit (km)   Revolution     (km)    

Earth     Moon         --------          3.82 x 105   27d  7h 43min  3456

Mars      Phobos       1877, Hall        9.30 x 103    0   7  39       16?
          Deimos       1877, Hall        2.34 x 104    1   6  18        8?

Jupiter   V            1892, Bernard     1.81 x 105    0  11  53      240?
          Io           1610, Galileo     4.19 x 105    1  18  28     3200
          Europa       1610, Galileo     6.67 x 105    3  13  14     2896
          Ganymede     1610, Galileo     1.05 x 106    7   3  43     4988
          Callisto     1610, Galileo     1.87 x 106   16  16  32     4505
          XIII         1974, Kowal       1.11 x 107  239  --  --       --
          VI           1904, Perrine     1.14 x 107  250  14  --      160?
          VII          1905, Perrine     1.17 x 107  259  14  --       56?
          X            1938, Nicholson   1.17 x 107  260  12  --       24?
          XII          1951, Nicholson   2.09 x 107  625  --  --       23?
          XI           1938, Nicholson   2.25 x 107  700  --  --       31?
          VIII         1908, Melotte     2.35 x 107  739  --  --       56?
          IX           1914, Nicholson   2.37 x 107  758  --  --       27?

Saturn    Mimas        1789, Herschel    1.95 x 105    0  22  37      483?
          Enceladus    1789, Herschel    2.38 x 105    1   9  53      563
          Tethys       1684, Cassini     2.94 x 105    1  21  18      805
          Diope        1684, Cassini     3.77 x 105    2  17  41      805
          Rhea         1684, Cassini     5.25 x 105    4  12  25     1609
          Titan        1655, Huygens     1.22 x 106   15  22  41     4586
          Hyperion     1848, Bond        1.48 x 106   21   6  38      483?
          Iapetus      1671, Cassinni    3.56 x 106   79   7  56     1287?
          Phobe        1898, Pickering   1.29 x 107  550  --  --      322?

Uranus    Miranda      1948, Kuiper      1.30 x 105    1   9  56       --
          Ariel        1851, Lassell     1.91 x 105    2  12  29      965?
	  Umbriel      1851, Lassell     2.67 x 105    4   3  28     6433?
          Titania      1787, Herschel    4.38 x 105    8  16  56     1609?
          Oberon       1787, Herschel    5.86 x 105   13  11   7     1448?

Neptune   Triton       1846, Lassell     3.54 x 105    5  21   3     2781
          Nereid       1949, Kuiper      5.54 x 106  359  10  --      322?

Pluto     Charon       --                1.96 x 103   --  --  --     1172

Note: All times are related to Earth's day/night system, not the planet's own day/night times. 
      ?   denotes uncertain data
      --  denotes unknown data

Add to this list:

Jupiter   S/1999 J 1       2000,  Spahr     Orbit: ~15 million miles      Period: ~2 years
...seen at http://cfa-www.harvard.edu/cfa/ps/pressinfo/S1999J1.html Also source of this week's favorite quote:

Armed with a perturbed, jovicentric orbital solution

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