Skrymir (moon)

{{Short description|Moon of Saturn}}

{{Infobox planet

| name = Skrymir

| alt_names = Saturn LVI
S/2004 S 23
S8630a

| named_after = Skrýmir/Skrymir

| discovery_ref = Discovery Circumstances [http://ssd.jpl.nasa.gov/?sat_discovery from JPL]

| discoverer = Sheppard et al.

| discovered = 2019

| orbit_ref = [https://sites.google.com/carnegiescience.edu/sheppard/moons/saturnmoons S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line]

| semimajor = {{val|21427000|u=km}}

| inclination = 177.7°

| eccentricity = 0.399

| period = −1164.3 days

| satellite_of = Saturn

| group = Norse group

| magnitude = 24.8

| mean_diameter = 4 km

}}

Skrymir (Saturn LVI), provisionally known as S/2004 S 23, 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.{{cite web |title=MPEC 2019-T129 : S/2004 S 23 |url=https://minorplanetcenter.net/mpec/K19/K19TC9.html |website=minorplanetcenter.net |accessdate=7 October 2019}} It was given its permanent designation in August 2021.{{cite web|title=M.P.C. 133821|url=https://www.minorplanetcenter.net/iau/ECS/MPCArchive/2021/MPC_20210810.pdf|website=Minor Planet Center|publisher=International Astronomical Union|date=10 August 2021|access-date=21 August 2021}} On 24 August 2022, it was officially named after Útgarða-Loki (also known as Skrýmir).{{cite web |url=https://astrogeology.usgs.gov/news/nomenclature/names-approved-for-10-small-satellites-of-saturn |title=Names Approved for 10 Small Satellites of Saturn |author= |date=24 August 2022 |website=usgs.gov |publisher=USGS |access-date=30 August 2022}} He is a jötunn from Norse mythology and master of illusions.{{cite web |url=https://planetarynames.wr.usgs.gov/Page/Planets |title=Planet and Satellite Names and Discoverers |author= |date= |website=usgs.gov |publisher=IAU WGPSN |access-date=30 August 2022}}

Skrymir is about 4 kilometres in diameter, and orbits Saturn at an average distance of 21.163 Gm in 1149.82 days, at an inclination of 177° to the ecliptic, in a retrograde direction and with an eccentricity of 0.373.