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Iapetus (muin)

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Photomosaic of Cassini images taken on 31 December 2004. It shows the dark Cassini Regio and its border with the bright Roncevaux Terra, several large craters (Falsaron above center, Turgis, the largest, at right), and the equatorial ridge (the Toledo and Tortelosa Montes).
Discovered biG. D. Cassini
Discovery dateOctober 25, 1671
Saturn VIII
AdjectivesIapetian, Japetian
Orbital chairactereestics
3560820 km
79.3215 d
3.26 km/s
  • 17.28° (to the ecliptic)
  • 15.47° (to Saturn's equator)
  • 8.13° (to Laplace plane)[2]
Satellite oSaturn
Pheesical chairacteristics
Dimensions1,492.0 × 1,492.0 × 1,424 km [3]
Mean radius
734.5±2.8 km[3]
Surface area
6700000 km2
Mass(1.805635±0.000375)×1021 kg[4]
Mean density
1.088±0.013 g/cm³[3]
0.224 m/s2
0.573 km/s
79.3215 d
Temperatur90–130 K

Iapetus (Greek: Ιαπετός), or occasionally Japetus,[7] is the third-lairgest naitural satellite o Saturn, eleivent-lairgest in the Solar Seestem,[8]


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  1. "Pseudo-MPEC for Saturn VIII". Archived frae the original on 22 Februar 2012. Retrieved 10 Julie 2016.
  2. Jacobson, R.A. (2009) SAT317 (17 December 2009). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 15 Januar 2011.
  3. a b c Roatsch, T.; Jaumann, R.; Stephan, K.; Thomas, P. C. (2009). "Cartographic Mapping of the Icy Satellites Using ISS and VIMS Data". Saturn from Cassini-Huygens. pp. 763–781. doi:10.1007/978-1-4020-9217-6_24. ISBN 978-1-4020-9216-9.
  4. Jacobson, R. A.; Antreasian, P. G.; Bordi, J. J.; Criddle, K. E.; Ionasescu, R.; Jones, J. B.; Mackenzie, R. A.; Meek, M. C.; Parcher, D.; Pelletier, F. J.; Owen, Jr., W. M.; Roth, D. C.; Roundhill, I. M.; Stauch, J. R. (December 2006). "The Gravity Field of the Saturnian System from Satellite Observations and Spacecraft Tracking Data". The Astronomical Journal. 132 (6): 2520–2526. Bibcode:2006AJ....132.2520J. doi:10.1086/508812.
  5. Williams, David R. "Saturnian Satellite Fact Sheet". NASA. Retrieved 4 November 2007.
  6. Observatorio ARVAL (15 Apryle 2007). "Classic Satellites of the Solar System". Observatorio ARVAL. Retrieved 17 December 2011.
  7. Lassell, William (14 Januar 1848). "Satellites of Saturn". Monthly Notices of the Royal Astronomical Society. 8 (3): 42–43. Bibcode:1848MNRAS...8...42L. doi:10.1093/mnras/8.3.42.
  8. The muins mair massive than Iapetus are: the Muin, the 4 Galilean muins (Ganymede, Callisto, Io, an Europa), Titan, Rhea, Titania, Oberon, an Triton. See JPLSSD.