911 Agamemnon

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911 Agamemnon
Discovery
Discovered by K. Reinmuth
Discovery date 19 March 1919
Designations
1919 FD
Jupiter Trojan
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 96.81 yr (35359 days)
Aphelion 5.6215 AU (840.96 Gm)
Perihelion 4.9275 AU (737.14 Gm)
5.2745 AU (789.05 Gm)
Eccentricity 0.065792
12.11 yr (4424.58 d)
186.643°
0° 4m 52.91s / day
Inclination 21.762°
338.017°
81.402°
Earth MOID 4.01857 AU (601.170 Gm)
Jupiter MOID 0.108514 AU (16.2335 Gm)
Jupiter Tisserand parameter 2.853
Physical characteristics
Mean radius
83.33±1.95 km
6.592 h (0.2747 d)
0.0444±0.002
7.89

911 Agamemnon is a large 167 kilometres (104 mi) trojan asteroid that orbits the Sun at the same distance as the planet Jupiter. It is located in the leading Lagrangian point L4. Based on IRAS data, Agamemnon is 167 kilometres (104 mi) in diameter and is probably the 2nd largest Jupiter Trojan.[2] Recent observations of the asteroid's occultations characterize its shape[3] and are suggestive of Agamemnon to have a satellite.[4]

It was discovered by Karl Wilhelm Reinmuth on March 19, 1919, in Heidelberg, Germany.[1] It is named after King Agamemnon, a main character of the Iliad.

The largest Jupiter trojans
Trojan Diameter (km)
624 Hektor 225
911 Agamemnon 167
1437 Diomedes 164
1172 Äneas 143
617 Patroclus 141
588 Achilles 135
1173 Anchises 126
1143 Odysseus 126
Source: JPL Small-Body Database, IRAS data

Photometric observations of this asteroid during 1997 were used to build a light curve showing a rotation period of 6.5819 ± 0.0007 hours with a brightness variation of 0.29 ± 0.01 magnitude. A 2009 study yielded a period of 6.592 ± 0.004, in reasonable agreement with the previous result.[5]

References[edit]

  1. ^ a b "JPL Small-Body Database Browser: 911 Agamemnon (1919 FD)" (2012-02-10 last obs). Jet Propulsion Laboratory. Retrieved 2 May 2016. 
  2. ^ "JPL Small-Body Database Search Engine: orbital class (TJN) and diameter > 50 (km)". JPL's Solar System Dynamics Group. Retrieved 2012-03-28. 
  3. ^ "Agamemnon profile predicted from distributedly observed occultations of the same star". IOTA (International Occultation Timing Association). Retrieved 2012-05-18. 
  4. ^ "On 2012-01-19 (911) Agamemnon occults HIP 41337 (SAO 60804)". Steve Conard, Willow Oak Observatory. Retrieved 2012-05-18. 
  5. ^ Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; Hahn, Gerhard; Schober, Hans-Josef; Lahulla, Felix; Delbò, Marco; Lagerkvist, Claes-Ingvar (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 170. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. 

External links[edit]