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ⓘ Pasiphae group. The Pasiphae group is a group of retrograde non-spherical moons of Jupiter that follow similar orbits to Pasiphae and are thought of have a comm ..




Pasiphae group
                                     

ⓘ Pasiphae group

The Pasiphae group is a group of retrograde non-spherical moons of Jupiter that follow similar orbits to Pasiphae and are thought of have a common origin.

Their semi-major axes distances from Jupiter range between 22.800.000 and 24.100.000 km the same range as the Carme group, their inclinations between 144.5° and 158.3°, and their eccentricities between 0.25 and 0.43.

Core members of the group include from the biggest to the smallest:

  • Eurydome
  • Megaclite
  • Sponde
  • Callirrhoe
  • Autonoe
  • Sinope, two-thirds the size of Pasiphae
  • Pasiphae

The International Astronomical Union IAU reserves names ending in -e for all retrograde moons, including this groups members.

                                     

1. Origin

The Pasiphae group is believed to have been formed when Jupiter captured an asteroid which broke up after a collision. The original asteroid was not disturbed heavily: the original body is calculated to have been 60 km in diameter, about the same size as Pasiphae; Pasiphae has 99% of the original bodys mass. However, if Sinope belongs to the group, the amount is much smaller, 87%.

The differences of colour between the objects grey for Pasiphae, light red for Callirrhoe and Megaclite also suggest that the group could have a more complex origin than a single collision.