Pasiphae group

File:TheIrregulars JUPITER GROUPS.svg

This diagram illustrates the largest irregular satellites of Jupiter. Among the Pasiphae group, Sinope and Pasiphae itself are labelled. An object's position on the horizontal axis indicates its distance from Jupiter. The vertical axis indicates its inclination. Eccentricity is indicated by yellow bars illustrating the object's maximum and minimum distances from Jupiter. Circles illustrate an object's size in comparison to the others.

The Pasiphae group is a group of retrograde irregular satellites of Jupiter that follow similar orbits to Pasiphae and are thought to have a common origin.

Their semi-major axes (distances from Jupiter) range between 22.6 and 24.3 million km (similar range as the Carme group), their inclinations between 141.5° and 157.3°, and their eccentricities between 0.22 and 0.44.

The members of the Pasiphae group are:<ref name="SheppardJewittPorco2004">Scott S. Sheppard, David C. Jewitt, Carolyn Porco Jupiter's outer satellites and Trojans, In: Jupiter. The planet, satellites and magnetosphere. Edited by Fran Bagenal, Timothy E. Dowling, William B. McKinnon. Cambridge planetary science, Vol. 1, Cambridge, UK: Cambridge University Press, Template:ISBN, 2004, p. 263 - 280 Full text(pdf). Template:Webarchive</ref>

Name	Diameter (km)<ref name="scott jupiter">Scott S. Sheppard Moons of Jupiter, Scott S. Sheppard Carnegie Science, [1], Retrieved 25 January 2024</ref>||Period (days)<ref name="nasa parameters">Planetary Satellite Mean Elements, Jet Propulsion Laboratory, [2], Retrieved 25 January 2024</ref>Template:Efn||Notes
Pasiphae	58	–743.61	largest member and group prototype
Sinope	38	–758.85	red colour
Callirrhoe	7	–758.87	reddish colour
Megaclite	6	–752.86	reddish colour
Autonoe	4	–761.00
Eurydome	3	–717.31
Sponde	2	–748.29
Hegemone	3	–739.81
Aoede	4	–761.42
Cyllene	2	–751.97
Kore	2	–776.76
S/2011 J 2	1	–718.32
Philophrosyne	2	–702.54
S/2017 J 1	2	–756.41
S/2017 J 6	2	–733.99
S/2003 J 4	2	–718.10
S/2003 J 23	2	–760.00
S/2016 J 4	1	–727.01

The International Astronomical Union (IAU) reserves names ending in -e for all retrograde moons.

Origin

The Pasiphae group is believed to have been formed when Jupiter captured an asteroid which subsequently 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 retains 99% of the original body's mass. However, if Sinope belongs to the group, the ratio is much smaller, 87%.<ref>Template:Cite journal</ref>

Unlike the Carme and Ananke groups, the theory of a single impact origin for the Pasiphae group is not accepted by all studies. This is because the Pasiphae group, while similar in semi-major axis, is more widely dispersed in inclination.Template:Efn Alternatively, Sinope might be not a part of the remnants of the same collision and captured independently instead.<ref name="Grav2003">Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, Kaare Photometric survey of the irregular satellites, Icarus, 166,(2003), pp. 33-45. Preprint</ref> The differences in color class 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.<ref name="Grav2003"/>

File:TheIrregulars JUPITER Pasiphae CORE i.svg

This diagram compares the orbital elements and relative sizes of the core members of the Pasiphae group. The horizontal axis illustrates their average distance from Jupiter, the vertical axis their orbital inclination, and the circles their relative sizes.

File:TheIrregulars JUPITER Pasiphae i.svg

This diagram compares the wide dispersion of the Pasiphae group (red) with the more compact Ananke (blue) and Carme (green) groups.

References

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