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S/2019 S 1

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Moon of Saturn
S/2019 S 1
S/2019 S 1 on the day of its discovery, revealed by stacking multiple images to its motion
Discovery
Discovered byE. Ashton et al.
Discovery date2019 (announced 2021)
Designations
Alternative namese26r58a12
Orbital characteristics
Semi-major axis11221100 km
Eccentricity0.623
Orbital period (sidereal)443.78 days
Inclination44.4°
Satellite ofSaturn
GroupInuit group (Kiviuq)
Physical characteristics
Mean diameter5+30%
−15% km
Albedo0.06 (assumed)
Apparent magnitude25.3
Absolute magnitude (H)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.

Apparent path of S/2019 S 1 as seen from Earth during 2019–2021. Coloured circles along the path mark the dates and locations at which the moon was observed.

S/2019 S 1 is about 5 kilometres in diameter, and orbits Saturn at an average distance of 11.2 million km (7.0 million mi) 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.

This moon's eccentric orbit takes it closer than 1.5 million km (0.93 million mi) to Iapetus several times per millennium.

References

  1. ^ "MPEC 2021-W14 : S/2019 S 1". minorplanetcenter.net. Retrieved 16 November 2021.
  2. ^ Ashton, Edward; Gladman, Brett; Beaudoin, Matthew; Alexandersen, Mike; Petit, Jean-Marc (May 2022). "Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio". The Astronomical Journal. 3 (5): 5. Bibcode:2022PSJ.....3..107A. doi:10.3847/PSJ/ac64a2. S2CID 248771843. 107.
  3. ^ Ashton, Edward; Gladman, Brett; Beaudoin, Matthew; Alexandersen, Mike; Petit, Jean-Marc (October 2021). Detection biases favour retrograde over direct irregular moons. 53rd Annual DPS Meeting. American Astronomical Society. 308.09. Retrieved 17 November 2021.
  4. ^ "S/2019 S 1 – Tilmann Denk".
Moons of Saturn
Listed in approximate increasing distance from Saturn
Ring moonlets
Ring shepherds
Other inner moons
Alkyonides
Large moons
(with trojans)
Inuit group (13)
Kiviuq subgroup
Paaliaq subgroup
Siarnaq subgroup
Gallic group (7)
Norse group (100)
Phoebe subgroup
Outlier prograde
irregular moons
  • S/2006 S 12
  • S/2004 S 24
    • Saturn
    Geography
    Moons
    Astronomy
    Exploration
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