S/2020 S 9
{{Short description|Moon of Saturn}}
{{Infobox planet
| name = S/2020 S 9
| image =
| caption =
| alt_names =
| discovery_ref =
| discoverer = Edward Ashton, Brett J. Gladman
| discovered = 2020
| earliest_precovery_date =
| orbit_ref =
| epoch =
| observation_arc =
| semimajor = {{cvt|25434100|km|lk=in}}
| eccentricity = 0.531
| period = -4.203 yrs (1,534.97 d)
| mean_anomaly =
| mean_motion =
| inclination = 161.4° {{small|(to the ecliptic)}}
| asc_node =
| arg_peri =
| satellite_of = Saturn
| group = Norse group
| mean_diameter = {{val|4|+errend=%|-errend=%|u=km}}
| rotation =
| albedo =
| magnitude =
| abs_magnitude = 16.0
}}
S/2020 S 9 is a small and faint natural satellite of Saturn. Its discovery was announced by Edward Ashton, Brett J. Gladman, Jean-Marc Petit and Mike Alexandersen on May 15, 2023 from observations taken between August 23, 2019 and August 16, 2020.
Physical Characteristics, Orbit and Origin
S/2020 S 9 orbits Saturn at a distance of 25.434 Gm in 1,534.97 days, at an inclination of 161.4, orbits in retrograde direction and eccentricity of 0.531. S/2020 S 9 belongs to the Norse group and it is one of the most distant moons from Saturn along with S/2004 S 26, S/2004 S 52 and S/2019 S 21. S/2020 S 9 might be a part of the Mundilfari subgroup, as it has similar inclination to Mundilfari.
S/2020 S 9 is estimated to be about 4 kilometers in diameter.
References
{{reflist|
|title = MPEC 2023-J178 : S/2020 S 9
|url = https://minorplanetcenter.net/mpec/K23/K23JH8.html
|work = Minor Planet Electronic Circular
|publisher = Minor Planet Center
|accessdate = 15 May 2023}}
|title = S/2020 S 9
|url = https://tilmanndenk.de/outersaturnianmoons/s2020_s9/
|work = Tilmann's Web Site
|publisher = Tilmann Denk
|accessdate = 24 December 2023}}
|title = Planetary Satellite Mean Elements
|url = https://ssd.jpl.nasa.gov/sats/elem/
|work = Jet Propulsion Laboratory
|publisher = California Institute of Technology
|accessdate = 15 May 2023}}
{{Moons of Saturn}}
Category:Astronomical objects discovered in 2020
Category:Astronomical objects discovered in 2023
Category:Moons with a retrograde orbit
{{natural-satellite-stub}}