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442505 (2011 WP21)
Classification: Main-belt Asteroid          SPK-ID: 2442505
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02739519340097984 7.7755e-08  
a 2.688971384892725 3.7701e-08 au
q 2.615306493753888 2.3269e-07 au
i 5.150610113044913 5.465e-06 deg
node 247.7410298680082 8.7134e-05 deg
peri 128.2623208475709 0.00015928 deg
M 22.35249908165527 0.00013259 deg
tp 2458900.499704631889
(2020-Feb-20.99970463)
0.00059286 TDB
period 1610.562926364931
4.41
3.3871e-05
9.273e-08
d
yr
n .2235243305969586 4.7009e-09 deg/d
Q 2.762636276031561 3.8734e-08 au
  Orbit Determination Parameters
   # obs. used (total)      132  
   data-arc span      4758 days (13.03 yr)  
   first obs. used      2006-10-11  
   last obs. used      2019-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56686  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 16:00:56  

Additional Information
 Earth MOID = 1.62027 au 
 Jupiter MOID = 2.36259 au 
 T_jup = 3.366 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457743.5 (2016-Dec-21.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02846718363689073 7.9642e-08  
q 2.612244491724338 2.379e-07 au
tp 2457272.898902793857
(2015-Sep-07.39890279)
0.00054679 TDB
node 247.7880031100216 8.728e-05 deg
peri 124.5668796221097 0.00015154 deg
i 5.145285699261584 5.4615e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      132  
   data-arc span      4758 days (13.03 yr)  
   first obs. used      2006-10-11  
   last obs. used      2019-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56686  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 16:00:56  

Additional Information
 Jupiter MOID = 2.36259 au 
 T_jup = 3.366 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.342864435901315E-15 -1.879877616297242E-14 -1.499196824671508E-11 -2.207942395619425E-14 -3.47542417193968E-12 -8.976969990925843E-15
q -1.879877616297242E-14 5.659808846835517E-14 4.152676890489976E-11 6.5876684743174E-14 9.690239501947159E-12 2.720562783621566E-14
tp -1.499196824671508E-11 4.152676890489976E-11 2.989793025704152E-7 1.944153583980717E-10 6.781762233776626E-8 2.863448689456744E-11
node -2.207942395619425E-14 6.5876684743174E-14 1.944153583980717E-10 7.617759523500822E-9 -7.542899139118257E-9 1.422681152929003E-11
peri -3.47542417193968E-12 9.690239501947159E-12 6.781762233776626E-8 -7.542899139118257E-9 2.296450762019584E-8 -7.518633077683297E-12
i -8.976969990925843E-15 2.720562783621566E-14 2.863448689456744E-11 1.422681152929003E-11 -7.518633077683297E-12 2.982824424612944E-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 17.1   n/a MPO456095  

442505 (2011 WP21)          Discovered 2006-Oct-11 by Spacewatch at Kitt Peak
Reference: Last Updated: 2015-09-02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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