Gerd (moon)

Moon of Saturn

GerdDiscovery[1]

Discovered by| Sheppard et al.
Discovery date| 2019
Designations

Named after

| Gerðr

Alternative names

| Saturn LVII
S/2004 S 25
S8631e[2]
Orbital characteristics[2]

Semi-major axis

| 20544500 km
Eccentricity| 0.457

Orbital period (sidereal)

| −1095.0 days
Inclination| 173.3°
Satellite of| Saturn
Group| Norse group
Physical characteristics

Mean diameter

| 4 km

Apparent magnitude

| 25.2

Gerd (Saturn LVII), provisionally known as S/2004 S 25, is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, and Jan Kleyna on October 7, 2019 from observations taken between December 12, 2004 and March 22, 2007.[3] It was given its permanent designation in August 2021.[4] On 24 August 2022, it was officially named after Gerðr, a jötunn from Norse mythology.[5] She is married to Freyr and the personification of fertile soil.[6]

Gerd is about 4 kilometres in diameter, and orbits Saturn at an average distance of 21.174 Gm in 1150.69 days, at an inclination of 173° to the ecliptic, in a retrograde direction and with an eccentricity of 0.442.[3]

## References

[edit]

1. ^ Discovery Circumstances from JPL
2. ^ a b S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
3. ^ a b "MPEC 2019-T132 : S/2004 S 25". minorplanetcenter.net. Retrieved 7 October 2019.
4. ^ "M.P.C. 133821" (PDF). Minor Planet Center. International Astronomical Union. 10 August 2021. Retrieved 21 August 2021.
5. ^ "Names Approved for 10 Small Satellites of Saturn". usgs.gov. USGS. 24 August 2022. Retrieved 30 August 2022.
6. ^ "Planet and Satellite Names and Discoverers". usgs.gov. IAU WGPSN. Retrieved 30 August 2022.

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Moons of Saturn

Listed in approximate increasing distance from Saturn

Ring moonlets|

* S/2009 S 1
* Aegaeon
* Bleriot
* Earhart
* Santos-Dumont
* Peggy
* Moonlets
* S/2004 S 3
* S/2004 S 4
* S/2004 S 6

Ring shepherds|

* Pan
* Daphnis
* Atlas
* Prometheus
* Pandora
* Epimetheus
* Janus

Alkyonides|

* Methone
* Anthe
* Pallene

Large moons
(with trojans)|

* Mimas
* Enceladus
* Tethys
* Telesto
* Calypso
* Dione
* Helene
* Polydeuces
* Rhea
* Titan
* Hyperion
* Iapetus

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

* Rings of Saturn
* Cassini–Huygens
* Chiron
* Chrysalis
* Themis
* S/2004 S 3
* S/2004 S 4
* S/2004 S 6
* Peggy
* Bleriot
* Moonlet
* In fiction

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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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