Moon Sinope
Sinope /səˈnoʊpiː/ is a retrograde irregular satellite of Jupiter discovered by Seth Barnes Nicholson at Lick Observatory in 1914, and is named after Sinope of Greek mythology.
 Sinope photographed by the Haute-Provence Observatory on 14 August 1998 | |
| Discovery | |
|---|---|
| Discovered by | Seth B. Nicholson |
| Discovery site | Lick Observatory |
| Discovery date | 21 July 1914 |
| Designations | |
Designation | Jupiter IX |
| Pronunciation | /səˈnoʊpiː/ |
Named after | Σινώπη Sinōpē |
| Adjectives | Sinopean /saɪnəˈpiːən/ |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Observation arc | 103.87 yr (37,938 days) |
| 0.1629144 AU (24,371,650 km) | |
| Eccentricity | 0.3366550 |
| –777.29 d (2.13 years) | |
| 71.53524° | |
| 0° 27m 47.33s / day | |
| Inclination | 158.63840° (to ecliptic) |
| 8.61437° | |
| 60.30205° | |
| Satellite of | Jupiter |
| Group | Pasiphae group |
| Physical characteristics | |
Mean diameter | 35.0±0.6 km |
| 13.16±0.10 h | |
| Albedo | 0.042±0.006 |
| 18.3 | |
| 11.1 | |
Sinope did not receive its present name until 1975; before then, it was simply known as Jupiter IX. It was sometimes called "Hades" 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. Sinope is believed to belong to the Pasiphae group of retrograde irregular moons. 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. 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.
Physical characteristics
From measurements of its thermal emission, Sinope has an estimated diameter of 35 km (22 mi). Sinope is red (colour indices B−V=0.84, R−V=0.46), unlike Pasiphae, which is grey.
Sinope's infrared spectrum is similar to those of D-type asteroids but different from that of Pasiphae. These dissimilarities of the physical parameters suggest a different origin from the core members of the group.
See also
References
External links
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