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226554 (2003 WR21)
Classification: Apollo [NEO, PHA]          SPK-ID: 2226554
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2613790328337064 4.342e-08  
a 1.118488201090054 2.604e-09 au
q .8261388368532236 4.7718e-08 au
i 9.275159175535027 5.5869e-06 deg
node 85.83980055753052 2.6713e-05 deg
peri 107.9832269569502 2.9611e-05 deg
M 229.8966661365892 1.3421e-05 deg
tp 2459156.646215278731
(2020-Nov-03.14621528)
1.6296e-05 TDB
period 432.0614686120031
1.18
1.5089e-06
4.131e-09
d
yr
n .8332147764911774 2.9098e-09 deg/d
Q 1.410837565326885 3.2847e-09 au
  Orbit Determination Parameters
   # obs. used (total)      281  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      9829 days (26.91 yr)  
   first obs. used      1990-10-24  
   last obs. used      2017-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48195  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jan-14 15:47:58  

Additional Information
 Earth MOID = .0295988 au 
 Jupiter MOID = 3.56079 au 
 T_jup = 5.535 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 19.5   n/a MPO418209  
diameter diameter 0.482 km 0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2014ApJ...784..110M)  
geometric albedo albedo 0.125   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2014ApJ...784..110M)  

226554 (2003 WR21)          Discovered 2003-Nov-20 by CSS at Catalina
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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