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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 
[ show covariance matrix ]

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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