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| − | '''Amalthea''' is an inner irregular satellite of | + | '''Amalthea''' is an inner irregular satellite of Jupiter, measuring 250 km across and is noted for its red color. |
<br> | <br> | ||
Amalthea was discovered by Edward Emerson Barnard on 9 September 1892, named after a nymph in Greek mythology. | 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> | 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> | 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> | Mean surface temperature 120°K<br> | ||
| − | Apparent | + | Apparent magnitude from Earth 14.1<br> |
[[Category: Articles]] | [[Category: Articles]] | ||
[[Category: Celestial bodies]] | [[Category: Celestial bodies]] | ||
| − | |||
[[Category: Satellites of Jupiter]] | [[Category: Satellites of Jupiter]] | ||
[[Category: Stubs]] | [[Category: Stubs]] | ||
{{JupiterSat}} | {{JupiterSat}} | ||