Editing Prometheus (moon) (section)

{{Short description|Moon of Saturn}}
{{For|the asteroid|1809 Prometheus}}
{{Infobox planet
| name = Prometheus
| image = Prometheus 12-26-09b.jpg
| image_scale =
| caption = Prometheus image from ''[[Cassini–Huygens|Cassini]]'' (December 26, 2009)
| pronounced = {{IPAc-en|p|r|ə|ˈ|m|iː|θ|iː<!--[sic] - long /iː/ with -ευς-->|ə|s}}<ref>{{Cite encyclopedia |url=http://www.lexico.com/definition/Prometheus |archive-url=https://web.archive.org/web/20200320063552/https://www.lexico.com/definition/prometheus |url-status=dead |archive-date=March 20, 2020 |title=Prometheus |dictionary=[[Lexico]] UK English Dictionary |publisher=[[Oxford University Press]]}}</ref>
| adjective = Promethean, -ian {{IPAc-en|p|r|ə|ˈ|m|iː|θ|iː|ə|n}}<ref>{{Cite encyclopedia |url=http://www.lexico.com/definition/Promethean |archive-url=https://web.archive.org/web/20200320063559/https://www.lexico.com/definition/promethean |url-status=dead |archive-date=March 20, 2020 |title=Promethean |dictionary=[[Lexico]] UK English Dictionary UK English Dictionary |publisher=[[Oxford University Press]]}}</ref>
| named_after = [[Prometheus|Προμηθεύς]] ''Promētheys''
| mpc_name = Saturn XVI
| discoverer = [[Stewart A. Collins]]<br/>D. Carlson<br/>[[Voyager 1]]
| discovered = October, 1980
| orbit_ref = {{sfn|Spitale Jacobson et al.|2006}}
| epoch = 31 December 2003 ([[Julian day|JD]] {{val|2453005.5}})
| semimajor = {{val|139380|10|u=km}}
| eccentricity = {{val|0.0022}}
| period = {{val|0.612990038|u=d}}
| inclination = {{val|0.008|0.004|u=°}} to Saturn's equator
| satellite_of = [[Saturn]]
| group = Inner [[shepherd moon]] of the [[F Ring]]
| dimensions = {{val|137.0|x|81.0|x|56.2}}&nbsp;km<br/>(±&nbsp;{{val|1.0|x|2.8|x|0.8}}&nbsp;km){{sfn|Thomas & Helfenstein|2020}}{{rp|page=2}}
| mean_diameter = {{val|85.6|1.4|u=km}}{{sfn|Thomas & Helfenstein|2020}}{{rp|page=2}}
| volume = {{val|327740|1710|u=km3}}{{sfn|Lainey et al.|2023}}{{rp|page=4}}
| mass = {{val|1.59720|0.00072|e=17|u=kg}}{{efn|Calculated from the standard gravitational parameter ''GM'' {{=}} {{val|1.06602|0.00048|e=-2|u=km<sup>3</sup>·s<sup>–2</sup>}} given by Lainey et al. (2023), divided by the [[gravitational constant]] ''G'' {{=}} {{val|6.6743|e=-2|u=km<sup>3</sup>·kg<sup>–1</sup>·s<sup>–2</sup>}}.{{sfn|Lainey et al.|2023}}}}
| density = {{val|0.4873|0.0026|u=g/cm3}}{{sfn|Lainey et al.|2023}}{{rp|page=4}}
| surface_grav = {{val|0.0007|-|0.0056|u=m/s2}}{{sfn|Thomas & Helfenstein|2020}}{{rp|page=3}}
| escape_velocity = {{V2|1.59720e-4|68.5|3}}&nbsp;km/s at longest axis<br/>to {{V2|1.59720e-4|28.1|3}}&nbsp;km/s at poles<!-- V2 template uses mass in terms of e+21 kg, radius in terms of km, and number of decimal places -->
| rotation = [[synchronous rotation|synchronous]]
| axial_tilt = zero
| albedo = 0.6
| single_temperature = ≈&thinsp;74 K
}}

'''Prometheus''' {{IPAc-en|p|r|ə|ˈ|m|iː|θ|iː|ə|s}} is an [[inner satellite]] of [[Saturn]]. It was discovered on 24 October 1980 from images taken by the ''[[Voyager 1]]'' probe, and was provisionally designated '''{{nowrap|S/1980 S 27}}'''.{{sfn|IAUC 3532}}

In late 1985 it was officially named after [[Prometheus]], a [[Titan (mythology)|Titan]] in [[Greek mythology]].{{sfn|IAUC 4157}} It is also designated '''{{nowrap|Saturn XVI}}'''.{{sfn|USGS: Planet and Satellite Names and Discoverers}}

Prometheus is extremely elongated, measuring approximately {{convert|137 x 81 x 56|km|mi|abbr=on}}. It has several ridges and valleys and a number of [[impact crater]]s of about {{convert|20|km|mi|abbr=on}} diameter are visible, but it is less cratered than nearby [[Pandora (moon)|Pandora]], [[Epimetheus (moon)|Epimetheus]], and [[Janus (moon)|Janus]]. From its very low density and relatively high [[albedo]], it is likely that Prometheus is a very porous icy body. There is much uncertainty in these values, however, and so this remains to be confirmed.