Discovery[1] | |
---|---|
Discovered by | F. Börngen L. D. Schmadel |
Discovery site | Karl Schwarzschild Obs. |
Discovery date | 14 October 1990 |
Designations | |
(11887) Echemmon | |
Pronunciation | /ɪˈkɛmɒn/ |
Named after | Ἐχέμμων Echemmōn[1] (Greek mythology) |
1990 TV12 · 1989 SX13 | |
Jupiter trojan[1][2] Trojan[3] · background[4] | |
Orbital characteristics[2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 63.26 yr (23,105 d) |
Aphelion | 5.6556 AU |
Perihelion | 4.7089 AU |
5.1823 AU | |
Eccentricity | 0.0913 |
11.80 yr (4,309 d) | |
171.52° | |
0° 5m 0.6s / day | |
Inclination | 24.044° |
242.65° | |
112.06° | |
Jupiter MOID | 0.0514 AU |
TJupiter | 2.8190 |
Physical characteristics | |
31.19±0.49 km[5] 38.51 km (calculated)[6] | |
8.47±0.01 h[7][a] | |
0.057 (assumed)[6] 0.095±0.008[5] | |
C (assumed)[6] | |
10.70[5] 10.8[1][2][6] | |
11887 Echemmon /ɪˈkɛmɒn/ is a Jupiter trojan from the Trojan camp, approximately 31 kilometers (19 miles) in diameter. It was discovered on 14 October 1990, by German astronomers Freimut Börngen and Lutz Schmadel at the Karl Schwarzschild Observatory in Tautenburg, Germany.[1] The dark Jovian asteroid has a rotation period of 8.5 hours.[6] It was named after the Trojan hero Echemmon from Greek mythology.[1]
MPC-object
was invoked but never defined (see the help page).jpldata
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