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10247 Amphiaraos

Trojan asteroid

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
Designations
MPC designation	(10247) Amphiaraos
Pronunciation	/ˌæmfiəˈreɪəs, -ɒs/^[2]
Named after	Amphiaraus^[1] (Greek mythology)
Alternative designations	6629 P-L · 1994 PT₉
Minor planet category	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	57.01 yr (20,822 d)
Aphelion	5.3043 AU
Perihelion	5.2213 AU
Semi-major axis	5.2628 AU
Eccentricity	0.0079
Orbital period (sidereal)	12.07 yr (4,410 d)
Mean anomaly	182.20°
Mean motion	0° 4^m 53.76^s / day
Inclination	4.1913°
Longitude of ascending node	162.52°
Argument of perihelion	343.92°
Jupiter MOID	0.2185 AU
T_Jupiter	2.9950
Physical characteristics
Mean diameter	26.83±0.69 km^[7]^[8] 33.54 km (calculated)^[4]
Synodic rotation period	34.26±0.01 h^[9]
Geometric albedo	0.057 (assumed)^[4] 0.098±0.015^[7]^[8]
Spectral type	X/D (Pan-STARRS)^[10] X/D (SDSS-MOC)^[11] C (assumed)^[4]
Absolute magnitude (H)	11.0^[8] 11.1^[3]^[4] 11.54±0.33^[10]

10247 Amphiaraos /ˌæmfiəˈreɪəs/ is a 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.^[4] It was named after the seer Amphiaraus (Amphiaraos) from Greek mythology.^[1]

Orbit and classification

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.^[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 an eccentricity of 0.01 and an inclination of 4° with respect to the ecliptic.^[3] The body's observation arc begins with its official discovery observation at Palomar in September 1960.^[1]

Palomar–Leiden survey

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.^[13]

Physical characteristics

Amphiaraos has been characterized as an X and D-type asteroid in the SDSS-based taxonomy,^[11] and by Pan-STARRS' survey.^[10] It is also an assumed C-type.^[4]

Rotation period

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).^[9]

Diameter and albedo

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,^[7]^[8] 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.^[4]

Naming

This minor planet was named after the Greek seer Amphiaraus (Amphiaraos), who was the king of Argos. He was one 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).^[14]

References

1 2 3 4 5 6 7 "10247 Amphiaraos (6629 P-L)". Minor Planet Center. Retrieved 31 May 2018.
↑ 'Amphiaraus' in Noah Webster (1884) A Practical Dictionary of the English Language
1 2 3 4 "JPL Small-Body Database Browser: 10247 Amphiaraos (6629 P-L)" (2017-09-27 last obs.). Jet Propulsion Laboratory. Retrieved 31 May 2018.
1 2 3 4 5 6 7 8 "MinorPlanet.info: One Asteroid Information". Asteroid Lightcurve Database (LCDB). Search using Number = "10247"
↑ "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. Retrieved 31 May 2018.
1 2 3 "Asteroid (10247) Amphiaraos". AstDyS-2, Asteroids – Dynamic Site. Retrieved 31 May 2018.
1 2 3 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:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711.
1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 118700974. (catalog)
1 2 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.
1 2 3 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". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339.
1 2 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 30 October 2019. (PDS data set)
↑ "Asteroid 10247 Amphiaraos". Small Bodies Data Ferret. Archived from the original on 19 August 2020. Retrieved 31 May 2018.
↑ "Minor Planet Discoverers". Minor Planet Center. 2018. Retrieved 31 May 2018.
↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 May 2018.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
10247 Amphiaraos at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
10247 Amphiaraos at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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