Global Information911 Agamemnon information
 Shape model of Agamemnon from its lightcurve | |
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 19 March 1919 |
| Designations | |
MPC designation | (911) Agamemnon |
| Pronunciation | /æɡəˈmɛmnɒn/[2] |
Named after | Agamemnon [3] (Greek mythology) |
Alternative designations | 1919 FD · 1937 QD |
Minor planet category | Jupiter trojan [1][4][5] Greek [6][7] · background [7] |
| Adjectives | Agamemnonian /ˌæɡəmɛmˈnoʊniən/[8] |
| Orbital characteristics [4] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 97.93 yr (35,770 d) |
| Aphelion | 5.6232 AU |
| Perihelion | 4.9300 AU |
Semi-major axis | 5.2766 AU |
| Eccentricity | 0.0657 |
Orbital period (sidereal) | 12.12 yr (4,427 d) |
Mean anomaly | 236.05° |
Mean motion | 0° 4m 52.68s / day |
| Inclination | 21.763° |
Longitude of ascending node | 338.01° |
Argument of perihelion | 80.874° |
| Known satellites | 1 (suspected)[9] |
| Jupiter MOID | 0.1064 AU |
| TJupiter | 2.8530 |
| Physical characteristics | |
| Dimensions | 190.6 km × 143.8 km[10] |
Mean diameter | 131.04±1.19 km[11] 166.66±3.9 km[12] 169±3 km[9] 185.30±3.37 km[13] |
Synodic rotation period | 6.5819±0.0007 h[14] 6.59±0.01 h[15][16][a] 6.592±0.004 h[17] |
Geometric albedo | 0.037±0.001[13] 0.0444±0.002[12] 0.072±0.010[11] |
Spectral type | D (Tholen)[4][5] D (S3OS2)[18] U–B = 0.215±0.021[19] B–V = 0.760±0.014[19] V–I = 0.980±0.038[5] |
Absolute magnitude (H) | 7.89[1][4][11][12][13] 8.27[20] |
911 Agamemnon, provisional designation 1919 FD, is a large Jupiter trojan and a suspected binary asteroid from the Greek camp, approximately 168 kilometers (100 miles) in diameter. It was discovered on 19 March 1919, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[1] The dark D-type asteroid is one of the largest Jupiter trojans and has a rotation period of 6.6 hours.[5] It is named after the Greek King Agamemnon, a main character of the Iliad.[3]
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