THE SATELLITES OF MARS.
| Name. | Mean Distance from Centre of Mars. | Periodic Time. | ||
| Hrs. | Mins. | Secs. | ||
| Phobos | 5,800 miles. | 7 | 39 | 14 |
| Deimos | 14,500 ” | 30 | 17 | 54 |
THE SATELLITES OF JUPITER.
| Name. | Mean Distance from Centre of Jupiter. | Periodic Time. | |||
| 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 | (?) |
THE SATELLITES OF SATURN.
| Name. | Mean Distance from Centre of Saturn. | Periodic Time. | |||
| 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.
THE SATELLITES OF URANUS.
| Name. | Mean Distance from Centre of Uranus. | Periodic Time. Days. |
| Ariel | 119,000 miles. | 2.520383 |
| Umbriel | 166,000 ” | 4.144121 |
| Titania | 272,000 ” | 8.705897 |
| Oberon | 363,000 ” | 13.463269 |