Erriapus

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Erriapus
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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[5][a]
10+50%
−30% km
28.15±0.25 h
Albedo0.06 (assumed)[4]
Spectral type
D[6]
23.0
13.7
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Erriapus /ɛriˈæpəs/, also known as Saturn XXVIII, is one of the mid-sized irregular moons of Saturn.

Discovery and naming

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]

Orbit

File:TheIrregulars SATURN PRO GROUPS.svg
The diagram illustrates the orbit from erriapus in relation to other prograde irregular satellites of Saturn. The eccentricity of the orbits is represented by the yellow segments extending from the pericentre to the apocentre.

Erriapus orbits Saturn at an average distance of 17,5 million kilometers in 864,92 days, at an inclination of about 37° to the ecliptic, in a prograde direction. eccentricity amounts to of 0.475. Its orbit is continuously changing due to solar and planetary perturbations.

Erriapus belongs to the Gallic group, a prograde group of moons orbiting between 16 and 23 million km from Saturn at an inclinations between 34 and 41°, and eccentricities between 0.07 and 0.56.

Physical characteristics

With an assumed albedo of 6%, its middle diameter is estimated at about 10 kilometers.

Erriapus is red in color (B−V=0.83, R−V=0.49)[6][12] similar to the other members of the Gallic group.

The rotation period was measured by the ISS camera of the Cassini spacecraft to 28 hours and 9 minutes.[3] which is relatively slow compared to other irregular moons of Saturn with known rotation periods. Is thought to rotate on its side, giving it similar seasons to those of Uranus.[13][14]

The Erriapus lightcurves show large brightness variations, indicative of an elongated or possibly contact-binary object.[3]

Origin

Erriapus probably did not form near Saturn but was captured by Saturn later. Like the other members of the Gallic group, which have similar orbits, Erriapus is probably the remnant of a broken, captured heliocentric asteroid.

Remarkably, recent observations revealed that the largest member of the group, Albiorix, actually displays two different colours: one compatible with Erriapus and Tarvos, and another less red. Instead of the common progenitor, it was postulated that Tarvos and Erriapus could be fragments of Albiorix.[15]

Exploration

Erriapus was observed by the Cassini spacecraft, during which time its light curve was measured and its rotation period determined.[3]

Notes

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  1. ^ Modeled using the diameter calculated from the assumed albedo.

References

  1. ^ Page Module:Citation/CS1/styles.css has no content."Planetary Satellite Discovery Circumstances". ssd.jpl.nasa.gov.
  2. ^ Page Module:Citation/CS1/styles.css has no content."Planetary Satellite Mean Elements". ssd.jpl.nasa.gov.
  3. ^ a b c d Page Module:Citation/CS1/styles.css has no content.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 Page Module:Citation/CS1/styles.css has no content.Denk, Tilmann; Mottola, Stefano; Tosi, Frederico; Bottke, William F.; Hamilton, Douglas P. (2018). "The Irregular Satellites of Saturn" (PDF). In Schenk, P.M.; Clark, R.N.; Howett, C.J.A.; Verbiscer, A.J.; Waite, J.H. (eds.). Enceladus and the Icy Moons of Saturn. Space Science Series. Vol. 322. Tucson, AZ: The University of Arizona Press. pp. 409–434. Bibcode:2018eims.book..409D. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075.
  5. ^ Page Module:Citation/CS1/styles.css has no content.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 Page Module:Citation/CS1/styles.css has no content.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.
  7. ^ Page Module:Citation/CS1/styles.css has no content."IAUC 7539: S/2000 S 10; OUTER Sats OF THE GIANT PLANETS". www.cbat.eps.harvard.edu. December 7, 2000.
  8. ^ Page Module:Citation/CS1/styles.css has no content."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. ^ Page Module:Citation/CS1/styles.css has no content."IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". www.cbat.eps.harvard.edu. August 8, 2003.
  10. ^ Page Module:Citation/CS1/styles.css has no content."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. ^ Page Module:Citation/CS1/styles.css has no content.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.
  13. ^ Page Module:Citation/CS1/styles.css has no content.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.
  14. ^ Page Module:Citation/CS1/styles.css has no content.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.
  15. ^ Page Module:Citation/CS1/styles.css has no content.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.

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