+--------------------+-----------+--------------+--------------+-----------+-------------+ | Satellite | V. | I. | II. | III. | IV. | +--------------------+-----------+--------------+--------------+-----------+-------------+ | Mean Long. | 264°.29 | 313°.7193 | 39°.1187 | 171°.2448 | 62°.2000 | | Synodic Period |11 h. 58 m.|1 d. 18 h. .48| 3d. 13h. .30|7d. 3h. .99|16d. 18m. .09| | Mean Distance |106,400 m. | 260,000 m. | 414,000 m. | 661,000 m.| 1,162,000 m.| | Mass ÷ Mass of Jup.| (?) | .00002831 | .00002324 | .00008125 | .00002149 | | Stellar Mag. | 13 | 6.0 | 6.1 | 5.6 | 6.6 | +--------------------+-----------+--------------+--------------+-----------+-------------+ The following numbers relating to the planet itself have been supplied mostly by Professor Hermann Struve. Filar Mic. Heliom. Equatorial diameter of Jupiter (Dist. 5.2028) 38´´.50 37´´.50 Polar diameter of Jupiter 36´´.02 35´´.23 Ellipticity 1 ÷ 15.5 1 ÷ 16.5 Theoretical ellipticity from motion of 900´´ in the pericentreof Sat. V 1 ÷ 15.3 Centrifugal force ÷ gravity at equator 0.0900 Mass of Jupiter ÷ Mass of Sun, now used in tables 1 ÷ 1047.34 Inclination of planet's equator to ecliptic 2° 9´.07 + 0.006t " " " " orbit 3° 4´.80 Long. of Node of equator on ecliptic 336° 21´.47 + 0´.762t " " " " orbit 135°25´.81 + 0.729t The longitudes are referred to the mean terrestrial equinox, and t is the time in years from 1900.0. For the elements of Jupiter's orbit, see SOLAR SYSTEM; and for physical constants, see PLANET. (S. N.)