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312635 (2009 WC221)
Classification: Jupiter Trojan          SPK-ID: 2312635
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01259951739448373 1.0416e-07  
a 5.183741818175371 2.8472e-07 au
q 5.118429172968758 7.7128e-07 au
i 3.617066790295377 8.4421e-06 deg
node 125.5067438644165 0.0001361 deg
peri 296.9544747229478 0.00047932 deg
M 312.8947292162467 0.00046722 deg
tp 2459564.566717484477
(2021-Dec-16.06671748)
0.0056151 TDB
period 4310.855556411508
11.80
0.00035517
9.724e-07
d
yr
n .08351010496386833 6.8803e-09 deg/d
Q 5.249054463381984 2.8831e-07 au
  Orbit Determination Parameters
   # obs. used (total)      138  
   data-arc span      6843 days (18.74 yr)  
   first obs. used      2001-01-26  
   last obs. used      2019-10-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .6433  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 08:11:52  

Additional Information
 Earth MOID = 4.13288 au 
 Jupiter MOID = .118521 au 
 T_jup = 2.996 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457496.5 (2016-Apr-18.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01234104759719128 9.705e-08  
q 5.110720972184239 7.3244e-07 au
tp 2455350.026004218215
(2010-Jun-02.52600422)
0.0059463 TDB
node 125.5156915583538 0.00013611 deg
peri 304.2296164593089 0.00051949 deg
i 3.618380134729254 8.4457e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      138  
   data-arc span      6843 days (18.74 yr)  
   first obs. used      2001-01-26  
   last obs. used      2019-10-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .6433  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 08:11:52  

Additional Information
 Jupiter MOID = .118521 au 
 T_jup = 2.996 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.418665767603699E-15 -6.859562842409343E-14 -2.947487550237515E-10 4.073122261256199E-14 -2.539553756799839E-11 -6.58849526778699E-16
q -6.859562842409343E-14 5.364697555181756E-13 2.281813968002297E-9 -2.953753893430787E-13 1.98167318868367E-10 1.082788116304075E-14
tp -2.947487550237515E-10 2.281813968002297E-9 3.535790874449733E-5 -2.621529780323105E-9 2.980522093885976E-6 6.175888287066397E-11
node 4.073122261256199E-14 -2.953753893430787E-13 -2.621529780323105E-9 1.852723655440095E-8 -1.871198989707858E-8 3.969562681259453E-10
peri -2.539553756799839E-11 1.98167318868367E-10 2.980522093885976E-6 -1.871198989707858E-8 2.698744274058901E-7 -3.906498314086605E-10
i -6.58849526778699E-16 1.082788116304075E-14 6.175888287066397E-11 3.969562681259453E-10 -3.906498314086605E-10 7.132942673527694E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9   n/a MPO455304  

312635 (2009 WC221)          Discovered 2009-Nov-16 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20120109/Numbers.arcLast Updated: 2012-01-11

Alternate Designations
 2009 WC221 = 2003 KK22 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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