Iapetus (muin)

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

Iapetus

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).
Discovery
Discovered bi	G. D. Cassini
Discovery date	October 25, 1671
Designations
Alternative names	Saturn VIII
Adjectives	Iapetian, Japetian
Orbital chairactereestics
Semi-major axis	7009356082000000000♠3560820 km
Eccentricity	6998286125000000000♠0.0286125 [1]
Orbital period	7001793215000000000♠79.3215 d
Average orbital speed	3.26 km/s
Inclination	17.28° (to the ecliptic) 15.47° (to Saturn's equator) 8.13° (to Laplace plane)[2]
Satellite o	Saturn
Pheesical chairacteristics
Dimensions	1,492.0 × 1,492.0 × 1,424 km [3]
Mean radius	7005734500000000000♠734.5±2.8 km [3]
Surface area	7006670000000000000♠6700000 km2
Mass	7021180563500000000♠(1.805635±0.000375)×1021 kg [4]
Mean density	7000108800000000000♠1.088±0.013 g/cm³ [3]
Surface gravity	0.224 m/s2
Escape velocity	0.573 km/s
Rotation period	7006685337760000000♠79.3215 d (synchronous)
Axial tilt	zero
Albedo	0.05–0.5[5]
Temperatur	90–130 K
Apparent magnitude	10.2–11.9[6]

References

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. 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.