_Sinon.png) Shape model of Sinon from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | H. Kosai K. Furukawa |
| Discovery site | Kiso Station |
| Discovery date | 18 February 1977 |
| Designations | |
| (3391) Sinon | |
| Pronunciation | /ˈsaɪnɒn/[2] |
Named after | Sinon(Greek mythology)[1] |
| 1977 DD3 | |
| Jupiter trojan[1][3] Greek[4] · background[5] | |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.16yr (23,071 d) |
| Aphelion | 5.7383AU |
| Perihelion | 4.8691 AU |
| 5.3037 AU | |
| Eccentricity | 0.0819 |
| 12.21 yr (4,461 d) | |
| 200.54° | |
| 0° 4m 50.52s / day | |
| Inclination | 14.871° |
| 341.10° | |
| 103.13° | |
| Jupiter MOID | 0.2572 AU |
| TJupiter | 2.9260 |
| Physical characteristics | |
| 37.86±6.82 km[6] 48.48 km(calculated)[7] | |
| 8.135 h[8][a] | |
| 0.057(assumed)[7] 0.093±0.036[6] | |
| C(assumed)[7] | |
| 10.3[1][3][6][7] | |
3391 Sinon/ˈsaɪnɒn/ is a mid-sizedJupiter trojan from theGreek camp, approximately 40 kilometers (25 miles) in diameter. It was discovered on 18 February 1977, by Japanese astronomersHiroki Kosai andKiichirō Furukawa at theKiso Observatory in Japan.[1] The dark Jovianasteroid has arotation period of 8.1 hours and likely an elongated shape.[7] It was named after the heroSinon from Greek mythology.[1]
Sinon is a dark Jovianasteroid in a 1:1orbital resonance with Jupiter. It is located in the leadingGreek camp at the Gas Giant'sL4Lagrangian point, 60° ahead on its orbit(seeTrojans in astronomy).[4] It is also a non-family asteroid of theJovian background population.[5] It orbits the Sun at a distance of 4.9–5.7 AU once every 12 years and 3 months (4,461 days;semi-major axis of 5.3 AU). Its orbit has aneccentricity of 0.08 and aninclination of 15° with respect to theecliptic.[3] The body'sobservation arc begins with aprecovery atPalomar Observatory in March 1953, almost 24 years prior to its official discovery observation at Kiso.[1]
Sinon is assumed to be a carbonaceousC-type asteroid.[7]
In February 2013, a rotationallightcurve of Sinon was obtained fromphotometric observations byLawrence Wasserman atLowell Observatory and byRobert Stephens at theCenter for Solar System Studies. Lightcurve analysis gave a well-definedrotation period of8.135±0.002 hours with a brightness amplitude of 0.72magnitude, indicative of a non-spherical shape (U=3).[7][8][a]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Sinon measures 37.86 kilometers in diameter and its surface has analbedo of 0.093,[6] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 48.48 kilometers based on anabsolute magnitude of 10.3.[7]
Thisminor planet was named fromGreek mythology afterSinon, a Greek warrior of theTrojan War.[1] The official naming citation was published by theMinor Planet Center on 16 December 1986 (M.P.C. 11443).[9]
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