Difference between revisions of "Amalthea"
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| − | Amalthea is an inner irregular satellite of Jupiter, measuring 250 km across and is noted for its red color. | + | '''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> | ||
| + | |||
| + | [[Category: Articles]] | ||
| + | [[Category: Celestial bodies]] | ||
| + | [[Category: Satellites of Jupiter]] | ||
| + | [[Category: Stubs]] | ||
{{JupiterSat}} | {{JupiterSat}} | ||
Revision as of 05:04, 5 February 2017
Amalthea is an inner irregular satellite of Jupiter, measuring 250 km across and is noted for its red color.
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
Primary body Jupiter
Periapsis 181150 km
Apoapsis 182840 km
Mean orbit radius 181365.84 km
Eccentricity 0.00319
Orbital period 11h57m23s (0.49817943d)
Average orbital speed 26.57 km/s
Inclination 0.374° (to Jupiter's equator)
PHYSICAL CHARACTERISTICS
Dimensions 250×146×128 km
Mean radius 83.5 km
Volume 2.43×106 km3
Mass 2.08×1018 kg
Mean density 0.857 g/cm3
Surface gravity 0.02 m/s2
Escape velocity 0.058 km/s
Rotation period synchronous
Axial tilt zero
Albedo 0.09
Mean surface temperature 120°K
Apparent magnitude from Earth 14.1