--------+---------------+---------------+-----------+----------------- | Mean Distance | Periodic Time | Diameter | | from the Sun | of Revolution | of Planet | Axial Rotation. | in Millions | in Days. | in Miles. | | of Miles. | | | --------+---------------+---------------+-----------+----------------- | | | | Hrs. Mins. Secs. Mercury | 35.9 | 87.969 | 2,992 | Uncertain. Venus | 67.0 | 224.70 | 7,660 | Uncertain. Earth | 92.7 | 365.26 | 7,918 | 23 56 4.09 Mars | 141 | 686.98 | 4,200 | 24 37 22.7 Jupiter | 482 | 4,332.6 | 85,000 | 9 55 -- Saturn | 884 | 10,759 | 71,000 | 10 14 23.8 Uranus | 1,780 | 30,687 | 31,700 | Unknown. Neptune | 2,780 | 60,127 | 34,500 | Unknown. --------+---------------+---------------+-----------+-----------------
----------+--------------------+------------------- Name. | Mean Distance from | Periodic Time. | Centre of Mars. | ----------+--------------------+------------------- | | Hrs. Mins. Secs. Phobos | 5,800 miles. | 7 39 14 Deimos | 14,500 ” | 30 17 54 ----------+--------------------+-------------------
----------+--------------------+------------------------- Name. | Mean Distance from | Periodic Time. | Centre of Jupiter. | ----------+--------------------+------------------------- | | Days Hrs. Mins. Secs. I | 262,000 miles. | 1 18 27 34 II | 417,000 ” | 3 13 13 42 III | 664,000 ” | 7 3 42 33 IV | 1,170,000 ” | 16 16 32 11 V | 112,400 ” | -- 11 57 (?) ----------+--------------------+--------------------------
----------+--------------------+------------------------- Name. | Mean Distance from | Periodic Time. | Centre of Saturn. | ----------+--------------------+------------------------- | | Days Hrs. Mins. Secs. Mimas | 118,000 miles. | 0 22 37 27.9 Enceladus | 152,000 ” | 1 8 53 6.7 Tethys | 188,000 ” | 1 21 18 25.7 Dione | 241,000 ” | 2 17 41 8.9 Rhea | 337,000 ” | 4 12 25 10.8 Titan | 781,000 ” | 15 22 41 25.2 Hyperion | 946,000 ” | 21 7 7 40.8 Iapetus | 2,280,000 ” | 79 7 54 40.4 ----------+--------------------+-------------------------
A ninth satellite was discovered in August, 1898, by Prof. W. H. Pickering, but its mean distance and periodic time have not yet been determined with precision.
----------+--------------------+--------------- Name. | Mean Distance from | Periodic Time. | Centre of Uranus. | Days. ----------+--------------------+--------------- Ariel | 119,000 miles. | 2.520383 Umbriel | 166,000 ” | 4.144121 Titania | 272,000 ” | 8.705897 Oberon | 363,000 ” | 13.463269 ----------+--------------------+---------------