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]
 Discovery images of Erriapus taken by the CFHT in September 2000 | |
| Discovery[1] | |
|---|---|
| Discovered by | John J. Kavelaars et al. |
| Discovery date | 2000 |
| 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 | |
| Eccentricity | 0.462 |
| 871.1 d (2.38 yr) | |
| Inclination | 38.7 |
| Satellite of | Saturn |
| Group | Gallic group |
| Physical characteristics[3][4] | |
| Dimensions | 16.30 × 10 × 6.34 km (modeled)[5] |
| 10+50% −30% km | |
| 28.15±0.25 h | |
| Albedo | 0.06 (assumed) |
Spectral type | light red B−V=0.83, R−V=0.49[6] |
| 23.0 | |
| 13.7 | |
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
edit- ^ "Planetary Satellite Discovery Circumstances". ssd.jpl.nasa.gov.
- ^ "Planetary Satellite Mean Elements". ssd.jpl.nasa.gov.
- ^ Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
- ^ 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.
- ^ 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.
- ^ 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. Bibcode:2003Icar..166...33G. doi:10.1016/j.icarus.2003.07.005.
- ^ "IAUC 7539: S/2000 S 10; OUTER Sats OF THE GIANT PLANETS". www.cbat.eps.harvard.edu. December 7, 2000.
- ^ "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.
- ^ "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". www.cbat.eps.harvard.edu. August 8, 2003.
- ^ "USGS: Spelling of Saturn XXVIII". Archived from the original on 2014-02-02. Retrieved 2019-08-10.
- ^ IAUC 9191: SATURN XXVIII (ERRIAPUS) January 11, 2011
- ^ 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. PMID 11449267.
- ^ 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. arXiv:astro-ph/0611590. Bibcode:2007Icar..191..267G. doi:10.1016/j.icarus.2007.04.020.
- ^ 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.
- ^ 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.