Amalthea
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
| Jupiters natural satellites |
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Named Satellites: Adrastea | Aitne | Amalthea | Ananke | Aoede | Arche | Autonoe | Callirrhoe | Callisto | Carme | Carpo | Chaldene | Cyllene | Dia | Eirene | Elara | Erinome | Ersa | Euanthe | Eukelade | Eupheme | Euporie | Europa | Eurydome | Ganymede | Harpalyke | Hegemone | Helike | Hermippe | Herse | Himalia | Io | Iocaste | Isonoe | Kale | Kallichore | Kalyke | Kore | Leda | Lysithea | Megaclite | Metis | Mneme | Orthosie | Pandia | Pasiphae | Pasithee | Philophrosyne | Praxidike | Sinope | Sponde | Taygete | Thebe | Thelxinoe | Themisto | Thyone | Valetudo Numbered Satellites: S/2003 J2 | S/2003 J4 | S/2003 J9 | S/2003 J10 | S/2003 J12 | S/2003 J16 | S/2003 J18 | S/2003 J19 | S/2003 J23 | S/2010 J 1 | S/2010 J 2 | S/2011 J 1 | S/2011 J 2 S/2016 J 1 | S/2017 J 1 | S/2017 J 2 | S/2017 J 3 | S/2017 J 5 | S/2017 J 6 | S/2017 J 7 | S/2017 J 8 | S/2017 J 9 |