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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2614124407984042 4.3471e-08  
a 1.118609008268721 2.6396e-09 au
q .8261906971181124 4.7731e-08 au
i 9.275121088968929 5.587e-06 deg
node 85.84137422616698 2.6712e-05 deg
peri 107.9915122808391 2.9608e-05 deg
M 256.6210031508353 1.3071e-05 deg
tp 2458724.592549802743
(2019-Aug-29.09254980)
1.5815e-05 TDB
period 432.1314705168621
1.18
1.5295e-06
4.188e-09
d
yr
n .8330798022403059 2.9487e-09 deg/d
Q 1.41102731941933 3.3296e-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 = .0298819 au 
 Jupiter MOID = 3.56178 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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