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Diagram illustrating the orbits of the irregular satellites of Saturn, with major groups and moons labeled. The inclination and semi-major axis are represented on the Y and X-axis, respectively. The satellites with inclinations below 90° are prograde, those above 90° are retrograde. The X-axis is labeled in terms of Saturn's Hill radius.

The Norse group is a large group of retrograde irregular satellites of Saturn. Their semi-major axes range between 12 and 27 Gm, their inclinations between 136° and 178° and their eccentricities between 0.06 and 0.63. Unlike the Inuit and Gallic groups, the orbital parameters are widely dispersed and the group is likely to be composed from a number of subgroups with more homogeneous orbital and physical parameters. The International Astronomical Union (IAU) reserves names taken from Norse mythology (mostly giants) for these moons. The exception is Phoebe ( Greek mythology), the largest, which was discovered long before the others.

The discovery of 17 new moons in this group was announced in October 2019. A team led by Scott S. Sheppard using the Subaru Telescope at Mauna Kea discovered 20 new moons, each about 5 kilometres (3.1 mi) in diameter. 17 of these are thought to fit into the Norse group. One of these is the most distant moon of Saturn. A public naming contest for these moons was announced, restricted to names from Norse mythology. [1] Ten of these moons received official names in August 2022. [2]

The members of the group are (in order of increasing distance from Saturn according to JPL mean orbital elements): [3]

Name Diameter (km) Period (days) Subgroup
Phoebe 213 –550.30 Phoebe
S/2006 S 20
 5 –567.27 Phoebe? [4] [5] [a]
S/2006 S 9
 3 –647.89 Phoebe? [6] [a]
Skathi 9 –728.10
S/2007 S 5 4 –746.88
S/2007 S 7 4 –754.29
S/2007 S 2 5 –754.90
S/2004 S 37 4 –754.48
S/2004 S 47 4 –762.49
S/2004 S 40 4 –764.60
S/2019 S 2 3 –799.82
S/2019 S 3 4 –837.74
S/2020 S 7 3 –861.70
Skoll 6 –878.44
S/2020 S 2 3 –897.60
S/2019 S 4 3 –904.26
S/2004 S 41 4 –914.61
S/2004 S 42 4 –925.91
Hyrrokkin 9 –931.89
Greip 6 –936.98
S/2004 S 13 4 –942.57
S/2007 S 6 3 –949.50
Mundilfari 8 –952.95
S/2006 S 1 5 –964.14
S/2004 S 43 4 –980.08
S/2006 S 10 3 –983.14
S/2019 S 5 3 –990.38
Gridr 5 –1004.75
Bergelmir 6 –1005.58
Jarnsaxa 5 –1006.92
Narvi 8 –1003.84
Suttungr 8 –1016.71
S/2007 S 3 5 –1026.35
S/2004 S 44 5 –1026.16
S/2004 S 45 4 –1038.70
Hati 6 –1040.29
S/2004 S 17 4 –1040.86
S/2006 S 11 3 –1042.28
S/2004 S 12 4 –1048.57
Eggther 6 –1052.33
S/2006 S 13 4 –1060.63
S/2007 S 9 4 –1078.07
S/2019 S 7 4 –1080.29
S/2019 S 8 4 –1088.68
Farbauti 5 –1087.29
Thrymr 9 –1091.84
Bestla 8 –1087.46
S/2019 S 9 4 –1093.11
S/2004 S 46 3 –1107.58
Angrboda 4 –1114.05
S/2019 S 11 4 –1115.00
Aegir 5 –1119.33
Beli 4 –1121.76
S/2019 S 10 3 –1123.04
S/2019 S 12 4 –1138.85
Gerd 4 –1142.97
S/2019 S 13 3 –1144.92
S/2006 S 14 3 –1152.68
Gunnlod 5 –1157.98
S/2019 S 15 3 –1161.54
S/2020 S 6 3 –1168.86
S/2004 S 7 5 –1173.93
S/2006 S 3 5 –1174.76
S/2005 S 5 3 –1177.82
Skrymir 5 –1185.15
S/2006 S 16 3 –1207.52
S/2006 S 15 4 –1213.96
S/2004 S 28 5 –1220.68
S/2020 S 8 3 –1228.12
Alvaldi 5 –1232.19
Kari 8 –1231.01
S/2004 S 48 4 –1242.40
Geirrod 4 –1251.14
Fenrir 4 –1260.25
S/2004 S 50 3 –1260.44
S/2006 S 17 4 –1264.58
S/2004 S 49 4 –1264.25
S/2019 S 17 4 –1291.39
Surtur 5 –1296.49
S/2006 S 18 4 –1298.40
Loge 6 –1311.83
Ymir 22 –1315.16
S/2019 S 19 3 –1318.05
S/2004 S 21 4 –1325.43
S/2019 S 18 3 –1327.06
S/2004 S 39 4 –1336.17
S/2019 S 16 3 –1341.17
S/2004 S 53 4 –1342.44
S/2004 S 36 4 –1352.93
Thiazzi 4 –1366.68
S/2019 S 20 3 –1375.45
S/2006 S 19 4 –1389.33
S/2004 S 34 4 –1420.77
Fornjot 6 –1494.03
S/2004 S 51 4 –1519.43
S/2020 S 10 3 –1527.22
S/2020 S 9 4 –1534.97
S/2004 S 26 5 –1603.95
S/2019 S 21 4 –1636.32
S/2004 S 52 3 –1633.98

Notes

  1. ^ a b May be a fragment of Phoebe, since it orbits at close proximity to Phoebe and could potentially be a part of the Phoebe subgroup.

See also

References

  1. ^ NASA (October 7, 2019). "Saturn surpasses Jupiter after the discovery of 20 new moons—and you can help name them". phys.org.
  2. ^ "Names Approved for 10 Small Satellites of Saturn". usgs.gov. USGS. 24 August 2022. Retrieved 30 August 2022.
  3. ^ "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory. Retrieved 7 June 2023.
  4. ^ Sheppard, Scott S.; Gladman, Brett J.; Alexandersen, Mike A.; Trujillo, Chadwick A. (May 2023). "New Jupiter and Saturn Satellites Reveal New Moon Dynamical Families". Research Notes of the American Astronomical Society. 7 (5). Bibcode: 2023RNAAS...7..100S. doi: 10.3847/2515-5172/acd766. 100.
  5. ^ "S/2006 S 20". Tilmann Denk. Retrieved 18 January 2024.
  6. ^ "S/2006 S 9". Tilmann Denk. Retrieved 6 January 2024.

External links

Retrieved from " https://en.wikipedia.org/?title=Norse_group&oldid=1215103902"
From Wikipedia, the free encyclopedia
(Redirected from S/2019 S 20)
Diagram illustrating the orbits of the irregular satellites of Saturn, with major groups and moons labeled. The inclination and semi-major axis are represented on the Y and X-axis, respectively. The satellites with inclinations below 90° are prograde, those above 90° are retrograde. The X-axis is labeled in terms of Saturn's Hill radius.

The Norse group is a large group of retrograde irregular satellites of Saturn. Their semi-major axes range between 12 and 27 Gm, their inclinations between 136° and 178° and their eccentricities between 0.06 and 0.63. Unlike the Inuit and Gallic groups, the orbital parameters are widely dispersed and the group is likely to be composed from a number of subgroups with more homogeneous orbital and physical parameters. The International Astronomical Union (IAU) reserves names taken from Norse mythology (mostly giants) for these moons. The exception is Phoebe ( Greek mythology), the largest, which was discovered long before the others.

The discovery of 17 new moons in this group was announced in October 2019. A team led by Scott S. Sheppard using the Subaru Telescope at Mauna Kea discovered 20 new moons, each about 5 kilometres (3.1 mi) in diameter. 17 of these are thought to fit into the Norse group. One of these is the most distant moon of Saturn. A public naming contest for these moons was announced, restricted to names from Norse mythology. [1] Ten of these moons received official names in August 2022. [2]

The members of the group are (in order of increasing distance from Saturn according to JPL mean orbital elements): [3]

Name Diameter (km) Period (days) Subgroup
Phoebe 213 –550.30 Phoebe
S/2006 S 20
 5 –567.27 Phoebe? [4] [5] [a]
S/2006 S 9
 3 –647.89 Phoebe? [6] [a]
Skathi 9 –728.10
S/2007 S 5 4 –746.88
S/2007 S 7 4 –754.29
S/2007 S 2 5 –754.90
S/2004 S 37 4 –754.48
S/2004 S 47 4 –762.49
S/2004 S 40 4 –764.60
S/2019 S 2 3 –799.82
S/2019 S 3 4 –837.74
S/2020 S 7 3 –861.70
Skoll 6 –878.44
S/2020 S 2 3 –897.60
S/2019 S 4 3 –904.26
S/2004 S 41 4 –914.61
S/2004 S 42 4 –925.91
Hyrrokkin 9 –931.89
Greip 6 –936.98
S/2004 S 13 4 –942.57
S/2007 S 6 3 –949.50
Mundilfari 8 –952.95
S/2006 S 1 5 –964.14
S/2004 S 43 4 –980.08
S/2006 S 10 3 –983.14
S/2019 S 5 3 –990.38
Gridr 5 –1004.75
Bergelmir 6 –1005.58
Jarnsaxa 5 –1006.92
Narvi 8 –1003.84
Suttungr 8 –1016.71
S/2007 S 3 5 –1026.35
S/2004 S 44 5 –1026.16
S/2004 S 45 4 –1038.70
Hati 6 –1040.29
S/2004 S 17 4 –1040.86
S/2006 S 11 3 –1042.28
S/2004 S 12 4 –1048.57
Eggther 6 –1052.33
S/2006 S 13 4 –1060.63
S/2007 S 9 4 –1078.07
S/2019 S 7 4 –1080.29
S/2019 S 8 4 –1088.68
Farbauti 5 –1087.29
Thrymr 9 –1091.84
Bestla 8 –1087.46
S/2019 S 9 4 –1093.11
S/2004 S 46 3 –1107.58
Angrboda 4 –1114.05
S/2019 S 11 4 –1115.00
Aegir 5 –1119.33
Beli 4 –1121.76
S/2019 S 10 3 –1123.04
S/2019 S 12 4 –1138.85
Gerd 4 –1142.97
S/2019 S 13 3 –1144.92
S/2006 S 14 3 –1152.68
Gunnlod 5 –1157.98
S/2019 S 15 3 –1161.54
S/2020 S 6 3 –1168.86
S/2004 S 7 5 –1173.93
S/2006 S 3 5 –1174.76
S/2005 S 5 3 –1177.82
Skrymir 5 –1185.15
S/2006 S 16 3 –1207.52
S/2006 S 15 4 –1213.96
S/2004 S 28 5 –1220.68
S/2020 S 8 3 –1228.12
Alvaldi 5 –1232.19
Kari 8 –1231.01
S/2004 S 48 4 –1242.40
Geirrod 4 –1251.14
Fenrir 4 –1260.25
S/2004 S 50 3 –1260.44
S/2006 S 17 4 –1264.58
S/2004 S 49 4 –1264.25
S/2019 S 17 4 –1291.39
Surtur 5 –1296.49
S/2006 S 18 4 –1298.40
Loge 6 –1311.83
Ymir 22 –1315.16
S/2019 S 19 3 –1318.05
S/2004 S 21 4 –1325.43
S/2019 S 18 3 –1327.06
S/2004 S 39 4 –1336.17
S/2019 S 16 3 –1341.17
S/2004 S 53 4 –1342.44
S/2004 S 36 4 –1352.93
Thiazzi 4 –1366.68
S/2019 S 20 3 –1375.45
S/2006 S 19 4 –1389.33
S/2004 S 34 4 –1420.77
Fornjot 6 –1494.03
S/2004 S 51 4 –1519.43
S/2020 S 10 3 –1527.22
S/2020 S 9 4 –1534.97
S/2004 S 26 5 –1603.95
S/2019 S 21 4 –1636.32
S/2004 S 52 3 –1633.98

Notes

  1. ^ a b May be a fragment of Phoebe, since it orbits at close proximity to Phoebe and could potentially be a part of the Phoebe subgroup.

See also

References

  1. ^ NASA (October 7, 2019). "Saturn surpasses Jupiter after the discovery of 20 new moons—and you can help name them". phys.org.
  2. ^ "Names Approved for 10 Small Satellites of Saturn". usgs.gov. USGS. 24 August 2022. Retrieved 30 August 2022.
  3. ^ "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory. Retrieved 7 June 2023.
  4. ^ Sheppard, Scott S.; Gladman, Brett J.; Alexandersen, Mike A.; Trujillo, Chadwick A. (May 2023). "New Jupiter and Saturn Satellites Reveal New Moon Dynamical Families". Research Notes of the American Astronomical Society. 7 (5). Bibcode: 2023RNAAS...7..100S. doi: 10.3847/2515-5172/acd766. 100.
  5. ^ "S/2006 S 20". Tilmann Denk. Retrieved 18 January 2024.
  6. ^ "S/2006 S 9". Tilmann Denk. Retrieved 6 January 2024.

External links

Retrieved from " https://en.wikipedia.org/?title=Norse_group&oldid=1215103902"

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