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911 Agamemnon (A919 FB)
Classification: Jupiter Trojan          SPK-ID: 2000911
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06699847351776032 2.7272e-08  
a 5.279220657333309 5.5442e-08 au
q 4.92552093192855 1.7654e-07 au
i 21.76210333432954 1.194e-06 deg
node 338.0043709438619 3.2494e-06 deg
peri 80.8612426596772 2.3003e-05 deg
M 333.4419019595127 2.4544e-05 deg
tp 2459723.349344249176
(2022-May-23.84934425)
0.00030398 TDB
period 4430.504162998594
12.13
6.9794e-05
1.911e-07
d
yr
n .08125486101706983 1.28e-09 deg/d
Q 5.632920382738067 5.9157e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2640  
   data-arc span      37359 days (102.28 yr)  
   first obs. used      1919-03-19  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39071  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:17:51  

Additional Information
 Earth MOID = 4.01693 au 
 Jupiter MOID = .111789 au 
 T_jup = 2.852 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456814.5 (2014-Jun-06.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06683262054822529 2.7121e-08  
q 4.918313868881927 1.7512e-07 au
tp 2455314.014780106450
(2010-Apr-27.51478011)
0.00028436 TDB
node 338.0348596432673 3.2511e-06 deg
peri 81.72032676797673 2.3157e-05 deg
i 21.76635682182086 1.1954e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2640  
   data-arc span      37359 days (102.28 yr)  
   first obs. used      1919-03-19  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39071  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:17:51  

Additional Information
 Jupiter MOID = .111789 au 
 T_jup = 2.852 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.355244777201363E-16 -4.590913079598325E-15 -2.725232076609303E-12 4.280734518799416E-14 -2.978512520832136E-13 3.179765202891345E-15
q -4.590913079598325E-15 3.066693957996501E-14 1.714624063680856E-11 -2.517675266913414E-13 1.938361542756833E-12 -1.940424931083516E-14
tp -2.725232076609303E-12 1.714624063680856E-11 8.086190323349251E-8 -3.830817731459361E-10 6.475117839308972E-9 -4.549770067161548E-11
node 4.280734518799416E-14 -2.517675266913414E-13 -3.830817731459361E-10 1.056989188223892E-11 -3.988610350203214E-11 3.172254618420524E-12
peri -2.978512520832136E-13 1.938361542756833E-12 6.475117839308972E-9 -3.988610350203214E-11 5.36230549245269E-10 -6.452565492015556E-12
i 3.179765202891345E-15 -1.940424931083516E-14 -4.549770067161548E-11 3.172254618420524E-12 -6.452565492015556E-12 1.428886297372711E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.97   n/a E2021B10 IRAS observations used: 18
diameter diameter 131.038 km 1.195 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 6.592 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2009) Minor Planet Bull. 36, 59-62.]
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[French, L.M.; Stephens, R.D.; Coley, D.R.; Megna, R.; Wasserman, L.H. (2012) Minor Planet Bull. 39, 183-187.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2014) Minor Planet Bull. 41, 210-212.]
geometric albedo albedo 0.072   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.760   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.96, mean=5.16, max.=8.36) deg.
U-B UB 0.215   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.96, mean=5.16, max.=8.36) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo

911 Agamemnon (A919 FB)          Discovered 1919-Mar-19 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A919 FB = 1937 QD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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