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1873 Agenor (1971 FH)
Classification: Jupiter Trojan          SPK-ID: 2001873
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .092098839060742 2.5289e-08  
a 5.228752551171271 7.3776e-08 au
q 4.747190511472504 1.565e-07 au
i 21.88274143277434 1.111e-06 deg
node 197.9197487806017 4.2164e-06 deg
peri 357.982250171968 1.4408e-05 deg
M 42.18015514246361 1.4146e-05 deg
tp 2458688.816711614848
(2019-Jul-24.31671161)
0.00017616 TDB
period 4367.124378668079
11.96
9.2429e-05
2.531e-07
d
yr
n .08243410738619625 1.7447e-09 deg/d
Q 5.710314590870039 8.0571e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2332  
   data-arc span      18257 days (49.98 yr)  
   first obs. used      1971-03-25  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42857  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:49:17  

Additional Information
 Earth MOID = 3.74523 au 
 Jupiter MOID = .711592 au 
 T_jup = 2.848 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457323.5 (2015-Oct-28.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09213367174243407 2.4901e-08  
q 4.754646372762198 1.5551e-07 au
tp 2458675.233419177544
(2019-Jul-10.73341918)
0.00017769 TDB
node 197.9174372630277 4.2153e-06 deg
peri 356.537119579015 1.4521e-05 deg
i 21.87822471931931 1.1111e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2332  
   data-arc span      18257 days (49.98 yr)  
   first obs. used      1971-03-25  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42857  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:49:17  

Additional Information
 Jupiter MOID = .711592 au 
 T_jup = 2.848 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.200402420063355E-16 -3.491015667250719E-15 1.184491725399501E-12 2.902546931695074E-14 1.296700091447601E-13 7.381115661282734E-15
q -3.491015667250719E-15 2.418208096409391E-14 -1.145553535014089E-11 -1.663077499879544E-13 -1.237420445085893E-12 -4.158651278998822E-14
tp 1.184491725399501E-12 -1.145553535014089E-11 3.157366438610046E-8 2.516509884163339E-10 2.448493357207117E-9 5.804496855569185E-11
node 2.902546931695074E-14 -1.663077499879544E-13 2.516509884163339E-10 1.776860955925953E-11 6.049876830483154E-12 4.397253807221989E-12
peri 1.296700091447601E-13 -1.237420445085893E-12 2.448493357207117E-9 6.049876830483154E-12 2.108642577704599E-10 1.074575623504825E-12
i 7.381115661282734E-15 -4.158651278998822E-14 5.804496855569185E-11 4.397253807221989E-12 1.074575623504825E-12 1.234474416134275E-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 10.25   n/a E2021B10  
diameter diameter 50.799 km 1.181 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 20.60 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.062   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

1873 Agenor (1971 FH)          Discovered 1971-Mar-25 by Van Houten, C. J. at Palomar
Discovered by C. J. van Houten and I. van Houten-Groeneveld, Leiden, on plates exposed by T. Gehrels in a survey of faint Trojans with the 122 cm Schmidt camera at Palomar.
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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