Saturday, October 12, 2013

Jupiter

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Taken from: Wikipedia
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A composite Cassini image of Jupiter. The dark spot is the shadow of Europa. The Great Red Spot, a persistent anticyclonic storm, is at lower right. White atmospheric bands, termed zones, represent areas of upwelling; brown bands, called belts, represent areas of downwelling. They display high-altitude ammonia ice clouds and lower clouds of unknown composition, respectively.
Designations
Pronunciation Listeni/ˈpɨtər/[1]
Adjective Jovian
Orbital characteristics[5][a]
Epoch J2000
Aphelion 816,520,800 km (5.458104 AU)
Perihelion 740,573,600 km (4.950429 AU)
Semi-major axis 778,547,200 km (5.204267 AU)
Eccentricity 0.048775
Orbital period
Synodic period 398.88 days[3]
Average orbital speed 13.07 km/s[3]
Mean anomaly 18.818°
Inclination
Longitude of ascending node 100.492°
Argument of perihelion 275.066°
Satellites 67[3]
Physical characteristics
Mean radius 69,911 ± 6 km[6][b]
Equatorial radius
Polar radius
  • 66,854 ± 10 km[6][b]
  • 10.517 Earths
Flattening 0.06487 ± 0.00015
Surface area
  • 6.1419×1010 km2[b][7]
  • 121.9 Earths
Volume
  • 1.4313×1015 km3[3][b]
  • 1321.3 Earths
Mass
  • 1.8986×1027 kg[3]
  • 317.8 Earths
  • 1/1047 Sun[8]
Mean density 1.326 g/cm3[3][b]
Equatorial surface gravity 24.79 m/s2[3][b]
2.528 g
Escape velocity 59.5 km/s[3][b]
Sidereal rotation period 9.925 h[9] (9 h 55 m 30 s)
Equatorial rotation velocity 12.6 km/s
45,300 km/h
Axial tilt 3.13°[3]
North pole right ascension 268.057°
17 h 52 min 14 s[6]
North pole declination 64.496°[6]
Albedo 0.343 (Bond)
0.52 (geom.)[3]
Surface temp. min mean max
1 bar level
165 K[3]
0.1 bar
112 K[3]
Apparent magnitude -1.6 to -2.94[3]
Angular diameter 29.8" – 50.1"[3]
Atmosphere[3]
Surface pressure 20–200 kPa[10] (cloud layer)
Scale height 27 km
Composition
89.8±2.0% hydrogen (H2)
10.2±2.0% helium (He)
~0.3% methane (CH4)
~0.026% ammonia (NH3)
~0.003% hydrogen deuteride (HD)
0.0006% ethane (C2H6)
0.0004% water (H2O)

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