6o6 



Tables 760-762 



TABLE 760.— Planetary Data 



* Earth and moon, t Relative to earth. Inclination of axes: Sun 7°. 25; Earth 23°.45; Mars 24°. 6; Jupiter 

 3°.i; Saturn 26°.8; Neptune 27°.2. Others doubtful. Approximate rates of rotation: Sun 25K' 1 ; Moon 27!^ d , 

 Mercury 88 d ; Venus 22S d ; Mars 24 h 37™; Jupiter o h 55™; Saturn io h I4 m . Asteroids (planetoids): Sept. 28, 1931, 

 1 183 had been numbered, inclination Pallas orbit 34 43', Hidalgo 43°; e, Albert, 0.54; Hidalgo 0.65. Heaviest 

 meteorite (So. Africa) 50 tons. 



TABLE 761.— Satellites of the Solar System 



Diameter 

 3476 km 



15? 

 8 ? 

 160 ? 

 3730 

 3150 

 5150 

 5180 

 130 ? 

 40 ? 



25? 

 25? 



650? 



800 ? 

 1300 ? 

 1200 ? 

 1750 ? 

 4200 



500 ? 

 1800 ? 



250 ? 



900 ? 



700 ? 

 1700 ? 

 1500 ? 

 5000 ? 



Earth's: Moon 



Martian: Phobos 



Deimos 



Jovian: 5th 



i, Io 



2, Europa 



3, Ganymede. . . . 



4, Callisto 



6th 



7th 



8th 



9th 



Saturnian: 7, Mimas. . . . 

 6, Enceladus. 

 5, Tethys. . . . 

 4, Dione 



2, Rhea 



1, Titan 



8, Hyperion. 



3, Iapetus. . . 



9, Phoebe. . . . 

 Uranian: 1, Ariel 



2, Umbriel . . . . 



3, Titania 



4, Oberon 



Neptune's: 1 



* Motion retrograde. Notes: Jovian; 1st 4 called Galilean; eccentricity 6, 7. 8, 9; 0.15, 0.21. 0.38, 0.25; masses 

 1, 2, 3, 4; 1.00. 0.65, 2.10, 0.58 of moon. 6, 7 orbits angle 29° and 28° to Jupiter's; 8, 32° or more properly, 148 . 

 9, inclination of orbit 156° to planets. Saturnian; Hyperion, mass., 1.86 X moon; Phoebe, eccentricity 0.17; 

 inclination s°3' or I74°7'. Uranus; orbits inclined 82°.2 to ecliptic, in that plane revolve backward = 97°-8 to 

 ecliptic and direct motion. Neptune; inclination, 40 . All other satellites are small eccentricity, mass and 

 inclinations. The mass of Saturn's ring < 1/1000000 Saturn's mass. 



TABLE 762.— Diameters of the Planets 

 From critical review by Rabe, Astron. Nach., 234, 154, 1928. Solar parallax taken as 

 8". 800, earth's radius 6738 km. Order of p.e. ± 0.04 for planets. 



At 

 Object dis- 



tance 



Mercury 1.000 



Venus " 



Earth 



Mars: Equat. . . " 



Polar. . . 



Jupiter: Equat. 5.203 



Polar. . 



At 

 Object dis- 



tance 



Saturn: Equat. . . 9-539 

 Polar . . . 



Outer ring " 



Crepe ring 



Uranus 1919 



Neptune 30.06 



Smithsonian Tables 



