S/2019 S 1

{{Short description|Moon of Saturn}}

{{Infobox planet

| name = S/2019 S 1

| image = 2019 S 1 CFHT 2019-07-02 15x205s stack annotated.png

| image_scale =

| caption = Canada–France–Hawaii Telescope image of {{nowrap|S/2019 S 1}} (center), revealed by stacking many images while following the moon's motion

| discovery_ref = {{cite web |title=MPEC 2021-W14 : S/2019 S 1 |url=https://www.minorplanetcenter.net/mpec/K21/K21W14.html |website=minorplanetcenter.net |access-date=16 November 2021}}

| discoverer = E. Ashton et al.

| discovered = 2019 (announced 2021)

| alt_names = e26r58a12

| orbit_ref =

| semimajor = {{val|11221100|u=km}}

| inclination = 44.4°

| eccentricity = 0.623

| period = 443.78 days

| satellite_of = Saturn

| group = Inuit group (Kiviuq)

| physical_ref =

| mean_diameter = {{val|5|30|15|+errend=%|-errend=%|u=km}}

| albedo = 0.06 (assumed)

| magnitude = 25.3

| abs_magnitude = 15.3

}}

S/2019 S 1 is a natural satellite of Saturn. Its discovery was announced by Edward Ashton, Brett J. Gladman, Jean-Marc Petit, and Mike Alexandersen on 16 November 2021 from Canada–France–Hawaii Telescope observations taken between 1 July 2019 and 14 June 2021.

File:2019 S 1 2019-2021 offset path.jpg

S/2019 S 1 is about 5 kilometres in diameter, and orbits Saturn at an average distance of {{convert|11.2|e6km|e6mi|abbr=unit}} in 443.78 days, at an inclination of 44° to the ecliptic, in a prograde direction and with an eccentricity of 0.623. It belongs to the Inuit group of prograde irregular satellites, and is among the innermost irregular satellites of Saturn. It might be a collisional fragment of Kiviuq and Ijiraq, which share very similar orbital elements.{{Cite web |title=S/2019 S 1 – Tilmann Denk |url=https://tilmanndenk.de/outersaturnianmoons/s2019_s1/ |language=en-US}}

This moon's eccentric orbit takes it closer than {{convert|1.5|e6km|e6mi|abbr=unit}} to Iapetus several times per millennium.