Long-term self-modification of irregular satellite groups

Li, Daohai; Christou, Apostolos

doi:10.1016/j.icarus.2017.12.004

Icarus

2018

DOI: 10.1016/j.icarus.2017.12.004

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Long-term self-modification of irregular satellite groups

Daohai Li

Apostolos Christou

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Cited by 3 publications

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“…These were the brightest found around 23rd mag, but were harder to discover and track because they are more in the glare of Jupiter. The Himalia group has a large velocity dispersion (Li & Christou 2018), which we suggest could be explained by a second breakup event after an initial Himalia breakup as most Himalia members don't cluster near Himalia but further away, near Elara and Lysithea.…”

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confidence: 83%

New Jupiter Satellites and Moon-Moon Collisions

et al. 2018

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mentioning

confidence: 83%

New Jupiter Satellites and Moon-Moon Collisions

et al. 2018

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New Jupiter and Saturn Satellites Reveal New Moon Dynamical Families

et al. 2023

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Tens of new moons around both Jupiter and Saturn have been announced on Minor Planet Electronic Circulars (MPECs) in late 2022 and early 2023. Jupiter now has 95 and Saturn 146 confirmed moons. Many smaller and fainter moons have also been detected at these planets but not yet confirmed through MPECs. These discoveries nearly complete the small moon population of Jupiter to about 2 km and Saturn to about 3 km and show new dynamical satellite families. The once lone Carpo is now joined by S/2018 J4, making it a group of two small prograde moons around Jupiter. The Inuit prograde family around Saturn appears to be 3 distinct groupings. S/2004 S24 seems to be a unique distant small Saturn prograde moon, as could be S/2006 S12 and S/2019 S6. S/2006 S20 might be the first found member of a compact Phoebe Saturn moon family.

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Evidence for a Recent Collision in Saturn’s Irregular Moon Population

2021

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Using CFHT imaging data, we searched a 1.1 deg2 field on each side of Saturn down to magnitude m w ≃ 26.3, corresponding to diameters of D ≃ 3 km. We detected 120 objects, which were comoving with Saturn and are nearly certainly irregular moons. For example, all but one of our detections brighter than magnitude 25.5 link to known Saturnian irregulars, with 40 linkages that thus extend the orbital arc of previous discoveries. Extrapolating our sample's characterized detections (those for which we can debias the search) to the entire Saturnian irregular population, we estimate that there are 150 ± 30 moons down to D = 2.8 km, which is approximately three times as many irregular moons as Jupiter down to the same size. At the smallest sizes, from D = 3.8 down to 2.8 km, we find that the Saturnian irregular population exhibits a steep size distribution of the differential power-law index q = 4.9 − 0.6 + 0.7 . We believe this steep size distribution is the signature of a relatively recent (few hundred Myr ago) collisional event in Saturn's retrograde irregular population.

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Long-term self-modification of irregular satellite groups

Cited by 3 publications

References 66 publications

New Jupiter Satellites and Moon-Moon Collisions

New Jupiter Satellites and Moon-Moon Collisions

New Jupiter and Saturn Satellites Reveal New Moon Dynamical Families

Evidence for a Recent Collision in Saturn’s Irregular Moon Population

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