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Adrastea
Adrastea
Adjective(s) Lunarian
Orbital properties
Aphelion/apoapsis 405400 km

(404000–406700 km)

Perihelion/periapsis 362600 km

(356400–370400 km)

Semi-major axis 384399 km (0.00257 AU)
Orbital eccentricity 0.0549
Orbital period 27.321582 d

(27 d 7 h 43.1 min)

Average orbital speed 1.022 km/s
Physical properties
Radius 1737.10 km
(0.273 Earths)
Mass 7.3477×1022 kg
(0.012300 Earths)
Mean density 3.3464 g/cm3

0.606 × Jupiter

Escape velocity 4.627 m/s
Rotation period 27.321582 d (synchronous)
Average surface temperature min mean max

100 K 220 K 390 K
70 K 130 K 230 K

Apparent magnitude −2.5 to −12.9

−12.74 (mean full moon)

Moons Several artifical satellites

Adrastea, also known Jupiter XV, is an irregular-shaped satellite and the smallest of the four inner moons belonging to the outer planet of Jupiter. This satellite was discovered by David C. Jewett and G. Edward Danielson on July 8, 1979. This planet orbits on the outer edge of Jupiter's Main Ring. In fact, this planet orbits Jupiter in less time than its day. Adrastea is the first moon to have been photograph by an interplanetary spacecraft instead of telescopic photography. This spacecraft was Voyager 2.

FormationEdit

Adrastea has a color spectrum that matches those of D-type asteroids, which are very rare in the Asteroid belt. It is believed it was thrown into deep space and pulled into Jupiter's gravitational pull and became one of its moons.

SurfaceEdit

Though its visible spectrum is grey and matches that of D-type asteroids, its infrared spectrum matches that of P-type and C-type asteroids, which contain carbon-based gases, and possibly signs of water ice.

OrbitEdit

Adrastea is the only one of three moons in the entire Solar System to orbit its primary in less time than the primary's day. The other ones being the innermost moon of Jupiter, Metis, and the largest of Mars' moons, Phobos.

Jovian Moons
Metis - Adrastea - Amalthea - Thebe - Io - Europa - Ganymede - Callisto - Themisto - Leda - Himalia - Lysithea - Elara - Dia - Carpo - S/2003 J 12 - Euporie S/2003 J 3 - S/2003 J 18 - S/2011 J 1 - S/2010 J 2 - Thelxinoe - Euanthe - Helike - Orthosie Iocaste - S/2003 J 16 - Praxidike - Harpalyke - Mneme - Hermippe - Thyone - Ananke - Herse - Aitne - Kale - Taygete - S/2003 J 19 - Chaldene - S/2003 J 15 - S/2003 J 10 - S/2003 J 23 - Erinome - Aoede - Kallichore - Kalyke - Carme - Callirrhoe - Eurydome - S/2011 J 2 - Pasithee S/2010 J 1 - Kore - Cyllene - Eukelade - S/2003 J 4 - Pasiphaë - Hegemone - Arche - Isonoe - S/2003 J 9 - S/2005 J 5 - Sinope - Sponde - Autonoe Megaclite - S/2003 J 2