| Discovery[1] | |
|---|---|
| Discovered by | C. Shoemaker E. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 11 October 1985 |
| Designations | |
| (5023) Agapenor | |
| Pronunciation | /æɡəˈpiːnɔːr/[2] |
Named after | Agapenor (Greek mythology)[3] |
| 1985 TG3 | |
| Jupiter trojan[4][5] (Greek camp)[6] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 31.72 yr (11,585 days) |
| Aphelion | 5.4430AU |
| Perihelion | 4.9085 AU |
| 5.1758 AU | |
| Eccentricity | 0.0516 |
| 11.78yr (4,301 days) | |
| 227.44° | |
| 0° 5m 1.32s / day | |
| Inclination | 11.777° |
| 308.36° | |
| 84.242° | |
| Jupiter MOID | 0.0440 AU |
| TJupiter | 2.9550 |
| Physical characteristics | |
| Dimensions | 27.850±3.511 km[7][8] 46.30 km(calculated)[5] |
| 5.4020±0.0017h[9] | |
| 0.057(assumed)[5] 0.173±0.093[7][8] | |
| X[10] · C[5] | |
| 10.3[7] · 10.4[1][5] · 10.88±0.13[10] | |
5023 Agapenor/æɡəˈpiːnɔːr/ is aJupiter trojan from theGreek camp, approximately 30 kilometers in diameter. It was discovered on 11 October 1985, by American astronomer coupleCarolyn andEugene Shoemaker at thePalomar Observatory in California, United States.[4] The Jovianasteroid was named forAgapenor from Greek mythology.
Agapenor orbits in the leading Greek camp at Jupiter'sL4Lagrangian point, 60° ahead of its orbit(seeTrojans in astronomy). It orbits the Sun in theouter main-belt at a distance of 4.9–5.4 AU once every 11 years and 9 months (4,301 days). Its orbit has aneccentricity of 0.05 and aninclination of 12° with respect to theecliptic.[1]
Aprecovery was taken at the discovering observatory in September 1985, extending the body'sobservation arc by 25 days prior to its official discovery observation.[4]
Agapenor has been characterized as anX-type asteroid byPanSTARRS photometric survey.[10]
In September 2009,Agapenor was observed by Italian astronomerStefano Mottola in a photometric survey of 80 Jupiter trojans, using the 1.2-meter reflector atCalar Alto Observatory in southeastern Spain. The obtainedlightcurve gave arotation period of5.4020 hours with a brightness variation of0.12 inmagnitude (U=2+).[9]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Agapenor measures 27.9 kilometers in diameter and its surface has analbedo of 0.17.[7][8]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo forcarbonaceous of 0.057 and calculates a significantly larger diameter of 46.3 kilometers.[5]
Thisminor planet was named from Greek mythology afterAgapenor. He was the leader of the Greek contingent of Arcadians in theTrojan War. The minor planet1020 Arcadia is named after this able group of warriors. Agapenor was the commander of 60 ships lend to him byAgamemnon, the king of Mycenae and leader of the Greeks in the Trojan War.911 Agamemnon, one of the largest Jupiter trojans known to exist, is named after the commander of the Greek forces.[3] The official naming citation was published by theMinor Planet Center on 12 July 1995 (M.P.C. 25443).[11]
