Astronomy:Erriapus

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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 afterErriap(p)us
S/2000 S 10
Orbital characteristics[2]
Epoch 2000 January 1.5
17 507 200 km
Eccentricity0.462
Orbital period871.1 d
(2.38 yr)
Inclination38.7
Satellite ofSaturn
GroupGallic group
Physical characteristics[5][6]
Dimensions16.30 × 10 × 6.34 km (modeled)[3]
Mean diameter10+50%
−30% km
Rotation period28.15±0.25 h
Albedo0.06 (assumed)
Spectral type
light red
B−V=0.83, R−V=0.49[4]
Apparent magnitude23.0
Absolute magnitude (H)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,[4][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.[6]

References

  1. ↑ "Planetary Satellite Discovery Circumstances". https://ssd.jpl.nasa.gov/sats/discovery.html. 
  2. ↑ "Planetary Satellite Mean Elements". https://ssd.jpl.nasa.gov/sats/elem/. 
  3. ↑ 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" (in en). Solar System Research (Springer Link) 56 (6): 403–410. doi:10.1134/S0038094622050045. ISSN 1608-3423. 
  4. ↑ 4.0 4.1 Grav, Tommy; Holman, Matthew J.; Gladman, Brett; Aksnes, Kaare (November 2003). "Photometric Survey of the Irregular Satellites". Icarus 166 (1): 33–45. doi:10.1016/j.icarus.2003.07.005. Bibcode: 2003Icar..166...33G. 
  5. ↑ Denk, T.; Mottola, S. (2019). "Cassini Observations of Saturn's Irregular Moons". 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute. https://www.hou.usra.edu/meetings/lpsc2019/pdf/2654.pdf. 
  6. ↑ 6.0 6.1 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. 322. University of Arizona Press. pp. 409–434. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537488. Bibcode: 2018eims.book..409D. https://tilmanndenk.de/wp-content/uploads/DenkEtAl2018_IrregularMoons.pdf. 
  7. ↑ "IAUC 7539: S/2000 S 10; OUTER Sats OF THE GIANT PLANETS". December 7, 2000. http://www.cbat.eps.harvard.edu/iauc/07500/07539.html. 
  8. ↑ "MPEC 2000-Y14 : S/2000 S 3, S/2000 S 4, S/2000 S 5, S/2000 S 6, S/2000 S 10". December 19, 2000. https://minorplanetcenter.net//mpec/K00/K00Y14.html. 
  9. ↑ "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". August 8, 2003. http://www.cbat.eps.harvard.edu/iauc/08100/08177.html. 
  10. ↑ "USGS: Spelling of Saturn XXVIII". https://astrogeology.usgs.gov/HotTopics/index.php?%2Farchives%2F315-Spelling-of-Saturn-XXVIII.html. 
  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. et al. (2001-07-12). "Discovery of 12 satellites of Saturn exhibiting orbital clustering" (in en). Nature 412 (6843): 163–166. doi:10.1038/35084032. ISSN 1476-4687. PMID 11449267. https://www.nature.com/articles/35084032. 
  13. ↑ Grav, T.; Bauer, J. (2007-03-08). "A deeper look at the colors of the Saturnian irregular satellites". Icarus 191 (1): 267–285. doi:10.1016/j.icarus.2007.04.020. Bibcode: 2007Icar..191..267G. 
  14. ↑ Denk, Tilmann; Mottola, S. (2013-10-01). "Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update". AAS/Division for Planetary Sciences Meeting Abstracts #45 45: 406.08. Bibcode: 2013DPS....4540608D. https://ui.adsabs.harvard.edu/abs/2013DPS....4540608D. 
  15. ↑ "Abstract Book Correlating to the Online Bulletin of the American Astronomical Society". 45th Annual Meeting Division for Planetary Sciences. 45. American Astronomical Society. October 2013. p. 170. https://aas.org/sites/default/files/2020-02/DPS_45_Abstract_Book.pdf. 



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