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FASTFACTS
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SOLAR-SYSTEM
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JUPITER
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1991-03-09
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JUPITER
DISTANCE FROM THE SUN:
MEAN 483,500,000 mi. (778,120,000 km.)
SHORTEST 460,800,000 mi. (740,000,000 km.)
GREATEST 507,000,000 mi. (816,000,000 km.)
CLOSEST APPROACH TO EARTH 390,000,000 mi. (628,000,000 km.)
LENGTH OF YEAR (EARTH-DAYS) 4,333
AVERAGE ORBITAL SPEED 8 mi. per sec. (13 km. per sec.)
DIAMETER AT EQUATOR 88,700 mi. (142,700 km.)
ROATION PERIOD
TILT OF AXIS (DEGREE) 3
AVERAGE TEMPERATURE Unknown; probably higher than -229°F.
(-145° C.)
ATMOSPHERE:
PRESSURE 15 lbs. per sq. in. (?)
(1 kg per cm2) (?)
GASES HYDROGEN, HELIUM, METHANE, AMMONIA,
ETHANE, ACETYLENE, PHOSPHINE, WATER
VAPOR, CARBON MONOXIDE
MASS (EARTH=1) 318
DENSITY (WATER=1) 1.33
GRAVITY (EARTH=1) 2.6
NUMBER OF SATELLITES 13
JUPITER'S SATELLITES
MEAN SIDEREAL VISUAL
NAME DISTANCE PERIOD MAGNITUDE RADIUS DISCOVERY
10³ mi. days hr min
113 0 11 57 13 34 Barnard 1892
IO 262 1 18 28 4.8 Var. 1,103 Galileo 1610
EUROPA 417 3 13 14 5.2 Var. 963 Galileo 1610
GANYMEDE 665 7 03 43 4.5 Var. 1,740 Galileo 1610
1,127 250 14 13.7 25 Perrine 1904
Callisto 1,168 16 16 32 5.5 Var. 1,570 Galileo 1610
7,276 263 13 18.6 <10 Nicholson 1938
7,296 259 16 16 20 Perrine 1905
12,900 631 02 18.8 <10 Nicholson 1951
13,900 692 12 18.1 <10 Nicholson 1938
14,500 738 22 18.8 <10 Melotte 1908
14,700 758 18.3 <10 Nicholson 1914