Sinope (moon)
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Sinope Template:IPAc-en is a retrograde irregular satellite of Jupiter discovered by Seth Barnes Nicholson at Lick Observatory in 1914,[1] and is named after Sinope of Greek mythology.
Sinope did not receive its present name until 1975;[2][3] before then, it was simply known as Jupiter IX. It was sometimes called "Hades"[4] between 1955 and 1975.
Orbit
Sinope orbits Jupiter on a high-eccentricity and high-inclination retrograde orbit. Its orbit is continuously changing due to solar and planetary perturbations.[5] Sinope is believed to belong to the Pasiphae group of retrograde irregular moons.[6] However, given its mean inclination and different colour, Sinope could be also an independent object, captured independently, unrelated to the collision and break-up at the origin of the group.[7] The diagram illustrates Sinope's orbital elements in relation to other satellites of the group.
Sinope is also known to be in a secular resonance with Jupiter, similar to Pasiphae. However, Sinope can drop out of this resonance and has periods of both resonant and non-resonant behaviour in time scales of 107 years.[8]
Physical characteristics
From measurements of its thermal emission, Sinope has an estimated diameter of Template:Cvt.[9] Sinope is pale red in color (colour indices V=18.63 B−V=0.84, R−V=0.46),[7] and it falls under the light red color-class, comparable to P-type asteroids and D-type asteroids. This sets it apart from Pasiphae, which is closer to C-type asteroids.
Sinope's infrared spectrum is similar to those of D-type asteroids but different from that of Pasiphae.[10] These dissimilarities of the physical parameters suggest a different origin from the core members of the group.
See also
References
External links
- Sinope Profile by NASA's Solar System Exploration
- David Jewitt pages
- Jupiter's Known Satellites (by Scott S. Sheppard)
- Ephemeris IAU-MPC NSES
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- ↑ Script error: No such module "Citation/CS1". (in which he declines to name the recently discovered satellites (pp. 93–94))
- ↑ IAUC 2846: Satellites of Jupiter 1974 October (naming the moon)
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- ↑ Sheppard, S. S.; and Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter, Nature, Vol. 423 (May 2003), pp. 261-263
- ↑ a b Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; Photometric Survey of the Irregular Satellites, Icarus, Vol. 166 (2003), pp. 33-45
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