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266894 (2009 WR81)
Classification: Outer Main-belt Asteroid          SPK-ID: 2266894
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1464567623332165 6.6329e-08  
a 3.513527795644861 8.0279e-08 au
q 2.998947890326952 2.3966e-07 au
i 12.18656620242066 9.1849e-06 deg
node 125.5571057986926 3.2661e-05 deg
peri 290.8465678694932 5.3298e-05 deg
M 158.8132747049437 5.2311e-05 deg
tp 2457539.298592230140
(2016-May-30.79859223)
0.00032956 TDB
period 2405.545175659407
6.59
8.2444e-05
2.257e-07
d
yr
n .1496542254299244 5.129e-09 deg/d
Q 4.028107700962771 9.2036e-08 au
  Orbit Determination Parameters
   # obs. used (total)      172  
   data-arc span      6083 days (16.65 yr)  
   first obs. used      2002-10-05  
   last obs. used      2019-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5091  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 04:37:01  

Additional Information
 Earth MOID = 2.03934 au 
 Jupiter MOID = 1.41747 au 
 T_jup = 3.070 
[ 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 15.1   n/a MPO437228  
diameter diameter 6.136 km 0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.047   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

266894 (2009 WR81)          Discovered 2009-Nov-18 by La Sagra at La Sagra
Reference: 20110218/Numbers.arcLast Updated: 2011-02-22

[ show close-approach data ]
Alternate Designations
 2009 WR81 = 2002 TH159 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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