Erriapus
Discovery images of Erriapus taken by the CFHT in September 2000
Discovery[1]
Discovered byJohn J. Kavelaars et al.
Discovery date2000
Designations
Designation
Saturn XXVIII
Pronunciation/ɛriˈæpəs/
Named after
Erriap(p)us
S/2000 S 10
Orbital characteristics[2]
Epoch 2000 January 1.5
17 507 200 km
Eccentricity0.462
871.1 d
(2.38 yr)
Inclination38.7
Satellite ofSaturn
GroupGallic group
Physical characteristics[3][4]
Dimensions16.30 × 10 × 6.34 km (modeled)[5]
Mean diameter
10+50%
−30% km
28.15±0.25 h
Albedo0.06 (assumed)
Spectral type
light red
B−V=0.83, R−V=0.49[6]
23.0
13.7

Erriapus /ɛriˈæpəs/, or Saturn XXVIII (28), is a prograde irregular satellite of Saturn. It was discovered by Brett Gladman, John J. Kavelaars and colleagues in 2000, and given the temporary designation S/2000 S 10.[7][8] It was named Erriapo in August 2003[9] after Erriapus (also rendered Erriappus), a giant in Gaulish mythology; the name was changed from dative Erriapo to nominative Erriapus per IAU conventions in late 2007.[10][11]

Erriapus is about 10 kilometres in diameter, and orbits Saturn at an average distance of 17.5 Gm in 871 days.

As a member of the Gallic group of irregular satellites, which share similar orbital characteristics and a light-red colour, Erriapus is hypothesized to have its origin in the break-up of a common progenitor of the group,[6][12] or to be a fragment of its largest member, Albiorix.[13] It has a rotation period of 28.15±0.25 h, and is thought to rotate on its side, giving it similar seasons to those of Uranus.[14][15] With a fairly elongated shape, it is a candidate for a contact binary or binary moon.[4]

References

  1. ^ "Planetary Satellite Discovery Circumstances". ssd.jpl.nasa.gov.
  2. ^ "Planetary Satellite Mean Elements". ssd.jpl.nasa.gov.
  3. ^ Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
  4. ^ a b Denk, Tilmann; Mottola, Stefano; Tosi, Frederico; Bottke, William F.; Hamilton, Douglas P. (2018). "The Irregular Satellites of Saturn". Enceladus and the Icy Moons of Saturn (PDF). Vol. 322. University of Arizona Press. pp. 409–434. Bibcode:2018eims.book..409D. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537488.
  5. ^ Melnikov, A. V.; Kopylova, Yu. G. (2022-12-01). "Simulation of the Rotational Dynamics and Light Curves of Saturn's Small Moons in the Fast Rotation Mode". Solar System Research. 56 (6). Springer Link: 403–410. doi:10.1134/S0038094622050045. ISSN 1608-3423.
  6. ^ a b Grav, Tommy; Holman, Matthew J.; Gladman, Brett; Aksnes, Kaare (November 2003). "Photometric Survey of the Irregular Satellites". Icarus. 166 (1): 33–45. arXiv:astro-ph/0301016. doi:10.1016/j.icarus.2003.07.005 – via arXiv.
  7. ^ "IAUC 7539: S/2000 S 10; OUTER Sats OF THE GIANT PLANETS". www.cbat.eps.harvard.edu. December 7, 2000.
  8. ^ "MPEC 2000-Y14 : S/2000 S 3, S/2000 S 4, S/2000 S 5, S/2000 S 6, S/2000 S 10". minorplanetcenter.net. December 19, 2000.
  9. ^ "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". www.cbat.eps.harvard.edu. August 8, 2003.
  10. ^ "USGS: Spelling of Saturn XXVIII". Archived from the original on 2014-02-02. Retrieved 2019-08-10.
  11. ^ IAUC 9191: SATURN XXVIII (ERRIAPUS) January 11, 2011
  12. ^ Gladman, Brett; Kavelaars, J. J.; Holman, Matthew; Nicholson, Philip D.; Burns, Joseph A.; Hergenrother, Carl W.; Petit, Jean-Marc; Marsden, Brian G.; Jacobson, Robert; Gray, William; Grav, Tommy (2001-07-12). "Discovery of 12 satellites of Saturn exhibiting orbital clustering". Nature. 412 (6843): 163–166. doi:10.1038/35084032. ISSN 1476-4687.
  13. ^ Grav, T.; Bauer, J. (2007-03-08) [2006-11-18]. "A deeper look at the colors of the Saturnian irregular satellites". Icarus. 191 (1): 267–285. doi:10.1016/j.icarus.2007.04.020 – via arXiv.
  14. ^ Denk, Tilmann; Mottola, S. (2013-10-01). "Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update". p. 406.08. Bibcode:2013DPS....4540608D.
  15. ^ Abstract Book Correlating to the Online Bulletin of the American Astronomical Society (PDF). 45th Annual Meeting Division for Planetary Sciences. Vol. 45. American Astronomical Society. October 2013. p. 170.

External links

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