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5652 Amphimachus

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5652 Amphimachus
Discovery [1]
Discovered byC. Shoemaker
E. M. Shoemaker
Discovery sitePalomar Obs.
Discovery date24 April 1992
Designations
(5652) Amphimachus
Pronunciation/æmˈfɪməkəs/[2]
Named after
Amphimachus [1]
(Greek mythology)
1992 HS3 · 1973 UE6
1985 SC5 · 1985 VX5
1991 FN4
Jupiter trojan [1][3]
Greek [4] · background [5]
AdjectivesAmphimachian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc63.10 yr (23,046 d)
Aphelion5.6054 AU
Perihelion4.8143 AU
5.2099 AU
Eccentricity0.0759
11.89 yr (4,343 d)
262.82°
0° 4m 58.44s / day
Inclination1.8988°
281.63°
107.94°
Jupiter MOID0.0902 AU
TJupiter2.9930
Physical characteristics
52.48±3.67 km[6]
53.92±0.49 km[7]
8.374±0.112 h[8]
0.061±0.011[7]
0.077±0.011[6]
C (assumed)[9]
V–I = 1.050±0.058[9]
9.80[6]
10.0[7]
10.1[1][3][9]

5652 Amphimachus /æmˈfɪməkəs/ is a Jupiter trojan from the Greek camp, approximately 53 kilometers (33 miles) in diameter. It was discovered on 24 April 1992, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California.[1] The dark Jovian asteroid belongs to the 80 largest Jupiter trojans and has a rotation period of 8.4 hours.[9] It was named from Greek mythology after Amphimachus, who was slain by Hector .[1]

Orbit and classification[edit]

Amphimachus is a dark 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).[4] It is also a non-family asteroid in the Jovian background population.[5]

It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 11 months (4,343 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.08 and an inclination of 2° with respect to the ecliptic.[3] The body's observation arc begins with a precovery at Palomar in April 1955, or 37 years prior to its official discovery observation.[1]

Physical characteristics[edit]

Amphimachus is an assumed C-type asteroid. It has a high V–I color index of 1.05.[9]

Rotation period[edit]

In August 2015, two rotational lightcurves of Amphimachus were obtained from photometric observations by the Kepler space observatory. Best-rated lightcurve analysis by Gyula M. Szabó gave a rotation period of 8.374±0.112 hours with a brightness amplitude of 0.22 magnitude (U=2+).[8] The second, concurring observation gave a period of 8.39 hours and an amplitude of 0.20 magnitude (U=2+).[10]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Amphimachus measures between 52.48 and 53.921 kilometers in diameter and its surface has an albedo between 0.061 and 0.077.[6][7]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.057 and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.[9]

100+ largest Jupiter trojans

Naming[edit]

This minor planet was named from Greek mythology after Amphimachus, son of Cteatus (Kteatos) and suitor of Helen of Troy. Amphimachus was a leader of the Elean (Epeian) contingent in the Trojan War. He was accidentally killed by Hector, who had thrown a spear at Teucer.[1] The official naming citation was published by the Minor Planet Center on 12 July 1995 (M.P.C. 25444).[11]

References[edit]

  1. ^ Jump up to: a b c d e f g h "5652 Amphimachus (1992 HS3)". Minor Planet Center. Retrieved 18 June 2018.
  2. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  3. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 5652 Amphimachus (1992 HS3)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 18 June 2018.
  4. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 18 June 2018.
  5. ^ Jump up to: a b "Asteroid (5652) Amphimachus – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 18 June 2018.
  6. ^ Jump up to: a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  7. ^ Jump up to: a b c d 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. (online catalog)
  8. ^ Jump up to: a b Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O.; et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids". Astronomy and Astrophysics. 599: 13. arXiv:1609.02760. Bibcode:2017A&A...599A..44S. doi:10.1051/0004-6361/201629401. S2CID 119275951.
  9. ^ Jump up to: a b c d e f "LCDB Data for (5652) Amphimachus". Asteroid Lightcurve Database (LCDB). Retrieved 18 June 2018.
  10. ^ Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal. 153 (3): 12. Bibcode:2017AJ....153..116R. doi:10.3847/1538-3881/153/3/116. S2CID 125570438.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 June 2018.

External links[edit]

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