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Peggy (moonlet)

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Moonlet of Saturn

Peggy
Discovery^[1]
Cassini image ofPeggy at the edge ofSaturn'sA Ring
Discovered by	Cassini Imaging Team
Discovery date	2013^[2]
Orbital characteristics
Semi-major axis	136,775.20 ±0.03km^[3]
Eccentricity	≈ 0.000
Inclination	≈ 0.0
Satellite of	Saturn
Group	outer A ring moonlet
Physical characteristics
Mean diameter	1 kilometre (0.62 mi)^[1]
Synodic rotation period	assumed synchronous

Peggy is the informal name for a formermoonlet in the outermost part ofSaturn'sRing A, orbiting 136,775 kilometres (84,988 mi) away from the planet. The moonlet was discovered by theCassini Imaging Team in 2013 and it may likely be exiting Saturn's A Ring.^[1] No direct image of Peggy has ever been made.^[4] Similar moons to Peggy includeBleriot,Earhart andSantos-Dumont among others.

Etymology

[edit]

The name of the moonlet comes from the mother-in-law ofCarl D. Murray, a professor at theQueen Mary University of London.^[4] Murray named it after his mother-in-law because it was her 80th birthday at the time.^[5]

Discovery

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The moonlet was first discovered in 2013, although its discovery was possible in 2012.^[4]Cassini took 2 images of the edge of Saturn'sA Ring, thereby ruling out it being a cosmic ray artifact.^[3] There were disturbances at the edges of Saturn'sA Ring, with one of these being approximately 20% brighter than its surroundings. There were also protuberances at the edge of the usually smooth A Ring.^[6]

Collision

[edit]

When it was first discovered, no similar object has been discovered inSaturn'smain rings.^[3] The moonlet was then seen again in 2014 but it was much dimmer than it was in 2013. Carl Murray suggests that there may have been a collision or was gravitationally ejected, though without evidence. InCassini observations past 2014, Peggy appears to be broken into two pieces, with the other being named Peggy B.^[2]

References

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^^a ^b ^c"Commotion at Ring's Edge May Be Effect of Small Icy Object". Jet Propulsion Laboratory. Retrieved3 November 2022.
^^a ^b"The (Not So) Sad Story of Peggy, Saturn's Newest Moon". National Geographic. 27 January 2015. Archived fromthe original on December 4, 2021. Retrieved3 November 2022.
^^a ^b ^cMurray, C. D.; Cooper, N. J.; Williams, G. A.; Attree, N. O.; Boyer, J. S. (2014-03-28)."The discovery and dynamical evolution of an object at the outer edge of Saturn's a ring".Icarus.236:165–168.Bibcode:2014Icar..236..165M.doi:10.1016/j.icarus.2014.03.024.
^^a ^b ^c"To see finally the face of Peggy".BBC News. 13 January 2017. Retrieved3 November 2022.
^"A Moon Is Born: Say Hello to 'Peggy' at Saturn". NBC. 15 April 2014. Retrieved3 November 2022.
^"NASA Cassini Images May Reveal Birth of a Saturn Moon". JPL. Retrieved3 November 2022.

Moons of Saturn

Listed in approximate increasing distance from Saturn

Ring moonlets

Ring shepherds

Alkyonides

Large moons
(withtrojans)

Inuit group (36)

Kiviuq subgroup (20)	S/2023 S 1 S/2019 S 1 S/2004 S 54 S/2004 S 55 S/2020 S 11 S/2019 S 22 Kiviuq S/2023 S 2 S/2019 S 23 S/2020 S 12 S/2005 S 4 S/2019 S 25 S/2020 S 1 Ijiraq S/2019 S 24 S/2007 S 10 S/2019 S 26 S/2020 S 13 S/2023 S 6 S/2023 S 7
Paaliaq	Paaliaq
Siarnaq subgroup (15)	S/2004 S 31 S/2023 S 19 S/2023 S 3 S/2020 S 19 Tarqeq S/2019 S 14 Siarnaq S/2019 S 32 S/2020 S 3 S/2005 S 6 S/2019 S 6 S/2004 S 58 S/2006 S 23 S/2020 S 5 S/2023 S 22

Gallic group (17)

Albiorix
S/2020 S 15
Bebhionn
S/2007 S 8
Saturn LX
S/2019 S 29
S/2023 S 18
S/2023 S 17
S/2007 S 11
Erriapus
S/2019 S 31
Tarvos
S/2020 S 4
S/2019 S 34
S/2005 S 7
S/2006 S 12
S/2004 S 24

Norse group (197)

Low-inclination (12)	S/2023 S 38 Skathi S/2020 S 17 S/2023 S 20 S/2023 S 30 Hyrrokkin Narvi S/2019 S 37 Bestla S/2019 S 11 S/2020 S 27 S/2023 S 46
Kari subgroup (15)	S/2006 S 1 S/2004 S 45 S/2023 S 27 S/2006 S 3 S/2023 S 33 S/2020 S 30 Kari Geirrod S/2019 S 17 S/2019 S 19 S/2019 S 18 S/2004 S 21 S/2004 S 36 S/2019 S 20 S/2006 S 29
Mundilfari subgroup (143)	S/2023 S 50 S/2023 S 9 S/2004 S 56 S/2023 S 8 S/2023 S 11 S/2006 S 21 S/2006 S 22 S/2023 S 13 S/2023 S 10 S/2023 S 12 S/2007 S 5 S/2007 S 7 S/2004 S 37 S/2004 S 47 S/2004 S 40 S/2020 S 14 S/2019 S 27 S/2023 S 14 S/2020 S 16 S/2023 S 16 S/2019 S 3 S/2020 S 7 S/2019 S 28 Skoll S/2019 S 30 S/2023 S 21 S/2023 S 4 S/2020 S 18 S/2020 S 2 S/2019 S 4 S/2020 S 20 S/2004 S 41 S/2004 S 57 S/2006 S 24 S/2004 S 42 S/2023 S 15 S/2023 S 24 S/2004 S 13 S/2007 S 6 S/2019 S 35 S/2006 S 25 Mundilfari S/2006 S 26 S/2019 S 33 S/2023 S 23 S/2020 S 21 S/2004 S 43 S/2006 S 10 S/2019 S 5 S/2023 S 25 S/2004 S 59 S/2006 S 27 Gridr Bergelmir Jarnsaxa S/2023 S 44 S/2020 S 22 S/2004 S 44 Hati S/2004 S 17 S/2004 S 12 S/2020 S 23 Eggther S/2023 S 28 S/2023 S 37 S/2023 S 26 S/2019 S 36 S/2006 S 13 S/2023 S 48 S/2023 S 29 S/2007 S 9 Farbauti S/2019 S 9 S/2023 S 32 S/2020 S 24 Aegir S/2019 S 10 Beli S/2023 S 31 S/2020 S 25 S/2023 S 34 S/2023 S 39 S/2019 S 12 S/2004 S 61 S/2006 S 14 S/2023 S 40 Gunnlod S/2019 S 15 S/2020 S 6 S/2020 S 26 S/2023 S 41 S/2004 S 7 S/2005 S 5 S/2006 S 16 S/2023 S 49 S/2006 S 15 S/2023 S 42 S/2004 S 28 S/2020 S 32 S/2020 S 8 S/2020 S 28 S/2019 S 38 S/2004 S 48 S/2023 S 36 S/2023 S 35 S/2020 S 29 Fenrir S/2004 S 50 S/2006 S 17 S/2004 S 49 S/2020 S 34 S/2020 S 31 S/2023 S 43 Surtur S/2006 S 18 S/2020 S 36 Loge S/2020 S 33 S/2004 S 39 S/2019 S 16 S/2004 S 53 S/2023 S 45 Thiazzi S/2020 S 38 S/2020 S 40 S/2019 S 40 S/2019 S 42 Saturn LXIV S/2020 S 39 S/2019 S 41 Fornjot S/2023 S 47 S/2004 S 51 S/2020 S 10 S/2020 S 42 S/2020 S 9 S/2023 S 5 S/2020 S 41 S/2019 S 21 S/2004 S 52 S/2020 S 43 S/2019 S 43 S/2020 S 44
Phoebe subgroup (27)	Phoebe S/2006 S 20 S/2006 S 9 S/2007 S 2 S/2019 S 2 Greip Suttungr S/2004 S 60 S/2007 S 3 S/2006 S 11 S/2019 S 7 S/2019 S 8 Thrymr S/2004 S 46 Angrboda Gerd S/2019 S 13 Skrymir S/2006 S 28 Alvaldi Ymir S/2020 S 35 S/2020 S 37 S/2019 S 39 S/2006 S 19 Saturn LVIII S/2019 S 44

v t e Saturn
Outline
Geography	Dragon Storm Great White Spot Saturn Electrostatic Discharges Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Inuit group Kiviuq Paaliaq Siarnaq Gallic group Albiorix Norse group Phoebe
Astronomy	Delta Octantis Saturn-crossing minor planets Solar eclipses on Saturn
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction The Day the Earth Smiled In Saturn's Rings (2018 documentary)
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