10247 Amphiaraos

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10247 Amphiaraos
Discovery [1]
Discovered by C. J. van Houten
I. van Houten-G.
T. Gehrels
Discovery site Palomar Obs.
Discovery date 24 September 1960
MPC designation (10247) Amphiaraos
Named after
(Greek mythology)
6629 P-L · 1994 PT9
Jupiter trojan[1][2][3]
Greek[4][5] · background[5]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 57.01 yr (20,822 d)
Aphelion 5.3043 AU
Perihelion 5.2213 AU
5.2628 AU
Eccentricity 0.0079
12.07 yr (4,410 d)
0° 4m 53.76s / day
Inclination 4.1913°
Jupiter MOID 0.2185 AU
TJupiter 2.9950
Physical characteristics
Mean diameter
26.83±0.69 km[6][7]
33.54 km (calculated)[3]
34.26±0.01 h[8]
0.057 (assumed)[3]
X/D (SDSS-MOC)[10]
C (assumed)[3]

10247 Amphiaraos, provisional designation 6629 P-L, is Jupiter trojan from the Greek camp, approximately 27 kilometers (17 miles) in diameter. It was discovered on 24 September 1960, by Dutch astronomers Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at the Palomar Observatory in California.[1] The X/D-type asteroid has a long rotation period of 34.26 hours and possibly an elongated shape.[3] It was named after the seer Amphiaraus (Amphiaraos) from Greek mythology.[1]

Orbit and classification[edit]

Amphiaraos is a Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is a non-family asteroid in the Jovian background population.[5][11] 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 an eccentricity of 0.01 and an inclination of 4° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at Palomar in September 1960.[1]

Palomar–Leiden survey[edit]

The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroid discoveries.[12]

Physical characteristics[edit]

Amphiaraos has been characterized as an X and D-type asteroid in the SDSS-based taxonomy,[10] and by Pan-STARRS' survey.[9] It is also an assumed C-type.[3]

Rotation period[edit]

In March 2012, a rotational lightcurve of Amphiaraos was obtained from photometric observations by Robert Stephens, Daniel Coley and Ralph Megna at the Goat Mountain Astronomical Research Station (G79) in California. Lightcurve analysis gave a longer-than average rotation period of 34.26 hours with a brightness amplitude of 0.55 magnitude (U=2).[8]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Amphiaraos measures 26.83 kilometers in diameter and its surface has an albedo of 0.098,[6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 33.54 kilometers based on an absolute magnitude of 11.1.[3]


This minor planet was named after the Greek seer Amphiaraus (Amphiaraos), who was the king of Argos. He was a participant in the war of the Seven Against Thebes.[1] The official naming citation was published by the Minor Planet Center on 24 January 2000 (M.P.C. 38199).[13]


  1. ^ a b c d e f g "10247 Amphiaraos (6629 P-L)". Minor Planet Center. Retrieved 31 May 2018. 
  2. ^ a b c d "JPL Small-Body Database Browser: 10247 Amphiaraos (6629 P-L)" (2017-09-27 last obs.). Jet Propulsion Laboratory. Retrieved 31 May 2018. 
  3. ^ a b c d e f g h "LCDB Data for (10247) Amphiaraos". Asteroid Lightcurve Database (LCDB). Retrieved 31 May 2018. 
  4. ^ "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. Retrieved 31 May 2018. 
  5. ^ a b c "Asteroid (10247) Amphiaraos". AstDyS-2, Asteroids – Dynamic Site. Retrieved 31 May 2018. 
  6. ^ a b c Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 31 May 2018. 
  7. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 31 May 2018.  (catalog)
  8. ^ a b French, Linda M.; Stephens, Robert D.; Coley, Daniel R.; Megna, Ralph; Wasserman, Lawrence H. (July 2012). "Photometry of 17 Jovian Trojan Asteroids". The Minor Planet Bulletin. 39 (3): 183–187. Bibcode:2012MPBu...39..183F. ISSN 1052-8091. Retrieved 31 May 2018. 
  9. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results" (PDF). Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 31 May 2018. 
  10. ^ a b Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 31 May 2018. 
  11. ^ "Asteroid 10247 Amphiaraos". Small Bodies Data Ferret. Retrieved 31 May 2018. 
  12. ^ "Minor Planet Discoverers". Minor Planet Center. 2018. Retrieved 31 May 2018. 
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 May 2018. 

External links[edit]