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− | + | '''Amalthea''' is an inner irregular satellite of [[Jupiter]], measuring 250 km across and is noted for its red color. | |
+ | <br> | ||
+ | Amalthea was discovered by Edward Emerson Barnard on 9 September 1892, named after a nymph in Greek mythology. | ||
− | + | Discovery E. E. Barnard, 9 September 1892<br> | |
− | + | [[Primary body]] Jupiter<br> | |
− | + | [[Periapsis]] 181150 km<br> | |
− | + | [[Apoapsis]] 182840 km<br> | |
− | + | [[Mean orbit radius]] 181365.84 km<br> | |
− | + | [[Eccentricity]] 0.00319<br> | |
− | + | [[Orbital period]] 11h57m23s (0.49817943d)<br> | |
− | + | [[Average orbital speed]] 26.57 km/s<br> | |
− | + | [[Inclination]] 0.374° (to Jupiter's equator)<br> | |
− | + | '''PHYSICAL CHARACTERISTICS'''<br> | |
− | + | Dimensions 250×146×128 km<br> | |
− | + | [[Mean radius]] 83.5 km<br> | |
− | + | [[Volume ]] 2.43×10<sup>6</sup> km<sup>3</sup><br> | |
− | + | [[Mass]] 2.08×10<sup>18</sup> kg<br> | |
− | + | [[Mean density]] 0.857 g/cm<sup>3</sup><br> | |
− | + | [[Surface gravity]] 0.02 m/s<sup>2</sup><br> | |
− | + | [[Escape velocity]] 0.058 km/s<br> | |
− | + | [[Rotation period]] synchronous<br> | |
− | + | [[Axial tilt]] zero<br> | |
− | + | [[Albedo]] 0.09 <br> | |
− | + | Mean surface temperature 120°K<br> | |
− | + | Apparent [[magnitude]] from Earth 14.1<br> | |
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+ | [[Category: Articles]] | ||
+ | [[Category: Celestial bodies]] | ||
+ | [[Category: Satellites of Jupiter]] | ||
+ | [[Category: Stubs]] | ||
{{JupiterSat}} | {{JupiterSat}} | ||
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