| Discovery[1] | |
|---|---|
| Discovered by | C. J. van Houten I. van Houten-G. T. Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 24 September 1960 |
| Designations | |
| (10247) Amphiaraos | |
| Pronunciation | /ˌæmfiəˈreɪəs,-ɒs/[2] |
Named after | Amphiaraus[1] (Greek mythology) |
| 6629 P-L · 1994 PT9 | |
| Jupiter trojan[1][3][4] Greek[5][6] · background[6] | |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 57.01yr (20,822 d) |
| Aphelion | 5.3043AU |
| Perihelion | 5.2213 AU |
| 5.2628 AU | |
| Eccentricity | 0.0079 |
| 12.07 yr (4,410 d) | |
| 182.20° | |
| 0° 4m 53.76s / day | |
| Inclination | 4.1913° |
| 162.52° | |
| 343.92° | |
| Jupiter MOID | 0.2185 AU |
| TJupiter | 2.9950 |
| Physical characteristics | |
| 26.83±0.69 km[7][8] 33.54 km(calculated)[4] | |
| 34.26±0.01 h[9] | |
| 0.057(assumed)[4] 0.098±0.015[7][8] | |
| X/D (Pan-STARRS)[10] X/D(SDSS-MOC)[11] C(assumed)[4] | |
| 11.0[8] 11.1[3][4] 11.54±0.33[10] | |
10247 Amphiaraos/ˌæmfiəˈreɪəs/ is aJupiter trojan from theGreek camp, approximately 27 kilometers (17 miles) in diameter. It was discovered on 24 September 1960, by Dutch astronomersIngrid andCornelis van Houten at Leiden, andTom Gehrels at thePalomar Observatory in California.[1] TheX/D-type asteroid has a longrotation period of 34.26 hours and possibly an elongated shape.[4] It was named after the seerAmphiaraus (Amphiaraos) from Greek mythology.[1]
Amphiaraos is a Jovianasteroid orbiting in the leading Greek camp at Jupiter'sL4Lagrangian point, 60° ahead of the Gas Giant's orbit in a1:1 resonance(seeTrojans in astronomy). It is a non-family asteroid in theJovian background population.[6][12] It orbits the Sun at a distance of 5.2–5.3 AU once every 12 years and 1 month (4,410 days;semi-major axis of 5.26 AU). Its orbit has aneccentricity of 0.01 and aninclination of 4° with respect to theecliptic.[3] The body'sobservation arc begins with its official discovery observation at Palomar in September 1960.[1]
Thesurvey designation "P-L" stands forPalomar–Leiden, named after Palomar Observatory andLeiden Observatory, which collaborated on the fruitfulPalomar–Leiden survey in the 1960s. Gehrels used Palomar'sSamuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped thephotographic plates to Ingrid and Cornelis van Houten at Leiden Observatory whereastrometry was carried out. The trio are credited with the discovery ofseveral thousand asteroid discoveries.[13]
Amphiaraos has been characterized as anX andD-type asteroid in theSDSS-based taxonomy,[11] and byPan-STARRS' survey.[10] It is also an assumedC-type.[4]
In March 2012, a rotationallightcurve ofAmphiaraos was obtained fromphotometric observations byRobert Stephens, Daniel Coley and Ralph Megna at the Goat Mountain Astronomical Research Station (G79) in California. Lightcurve analysis gave a longer-than averagerotation period of 34.26 hours with a brightness amplitude of 0.55magnitude (U=2).[9]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Amphiaraos measures 26.83 kilometers in diameter and its surface has analbedo of 0.098,[7][8] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 33.54 kilometers based on anabsolute magnitude of 11.1.[4]
Thisminor planet was named after the Greek seerAmphiaraus (Amphiaraos), who was the king ofArgos. He was one of theSeven against Thebes.[1] The officialnaming citation was published by theMinor Planet Center on 24 January 2000 (M.P.C. 38199).[14]
