11887 Echemmon

11887 Echemmon
Discovery[1]
Discovered byF. Börngen
L. D. Schmadel
Discovery siteKarl Schwarzschild Obs.
Discovery date14 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 arc63.26 yr (23,105 d)
Aphelion5.6556 AU
Perihelion4.7089 AU
5.1823 AU
Eccentricity0.0913
11.80 yr (4,309 d)
171.52°
0° 5m 0.6s / day
Inclination24.044°
242.65°
112.06°
Jupiter MOID0.0514 AU
TJupiter2.8190
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]

  1. ^ a b c d e f Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference MPC-Jupiter-Trojans was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference AstDys-object was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Grav-2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference lcdb was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Stephens-2014c was invoked but never defined (see the help page).


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