Astronomy:10247 Amphiaraos

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Short description: Trojan asteroid
10247 Amphiaraos
Discovery[1]
Discovered byC. J. van Houten
I. van Houten-G.
T. Gehrels
Discovery sitePalomar Obs.
Discovery date24 September 1960
Designations
(10247) Amphiaraos
Pronunciation/ˌæmfiəˈreɪəs, -ɒs/[6]
Named afterAmphiaraus[1]
(Greek mythology)
6629 P-L · 1994 PT9
Minor planet categoryJupiter trojan[1][2][3]
Greek[4][5] · background[5]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc57.01 yr (20,822 d)
|{{{apsis}}}|helion}}5.3043 AU
|{{{apsis}}}|helion}}5.2213 AU
5.2628 AU
Eccentricity0.0079
Orbital period12.07 yr (4,410 d)
Mean anomaly182.20°
Mean motion0° 4m 53.76s / day
Inclination4.1913°
Longitude of ascending node162.52°
343.92°
Jupiter MOID0.2185 AU
TJupiter2.9950
Physical characteristics
Mean diameter26.83±0.69 km[7][8]
33.54 km (calculated)[3]
Rotation period34.26±0.01 h[9]
Geometric albedo0.057 (assumed)[3]
0.098±0.015[7][8]
X/D (Pan-STARRS)[10]
X/D (SDSS-MOC)[11]
C (assumed)[3]
Absolute magnitude (H)11.0[8]
11.1[2][3]
11.54±0.33[10]


10247 Amphiaraos /ˌæmfiəˈreɪəs/ 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

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][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.[2] The body's observation arc begins with its official discovery observation at Palomar in September 1960.[1]

Palomar–Leiden survey

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.[3]

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 ({{{1}}}).[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.[3]

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).[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "10247 Amphiaraos (6629 P-L)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=10247. Retrieved 31 May 2018. 
  2. ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 10247 Amphiaraos (6629 P-L)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2010247. Retrieved 31 May 2018. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (10247) Amphiaraos". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=10247%7CAmphiaraos. Retrieved 31 May 2018. 
  4. ↑ "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html. Retrieved 31 May 2018. 
  5. ↑ 5.0 5.1 5.2 "Asteroid (10247) Amphiaraos". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?n=10247&pc=1.1.6. Retrieved 31 May 2018. 
  6. ↑ 'Amphiaraus' in Noah Webster (1884) A Practical Dictionary of the English Language
  7. ↑ 7.0 7.1 7.2 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. doi:10.1088/0004-637X/759/1/49. Bibcode: 2012ApJ...759...49G. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.  (catalog)
  9. ↑ 9.0 9.1 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. ISSN 1052-8091. Bibcode: 2012MPBu...39..183F. 
  10. ↑ 10.0 10.1 10.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. 
  11. ↑ 11.0 11.1 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. doi:10.1051/0004-6361/200913322. Bibcode: 2010A&A...510A..43C. https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab. Retrieved 30 October 2019.  (PDS data set)
  12. ↑ "Asteroid 10247 Amphiaraos". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=10247+Amphiaraos. Retrieved 31 May 2018. 
  13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 31 May 2018. 
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