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136840 (1997 WN28)
Classification: Main-belt Asteroid          SPK-ID: 2136840
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1397365930817395 4.69e-08  
a 2.731123344065374 1.3832e-08 au
q 2.349485472679671 1.3158e-07 au
i 24.8905455637469 5.2048e-06 deg
node 234.8550683891868 1.0986e-05 deg
peri 142.0511486813885 2.394e-05 deg
M 25.76652876645334 1.8901e-05 deg
tp 2458882.504943505494
(2020-Feb-03.00494351)
8.6427e-05 TDB
period 1648.581410520713
4.51
1.2524e-05
3.429e-08
d
yr
n .2183695616744169 1.6589e-09 deg/d
Q 3.112761215451076 1.5765e-08 au
  Orbit Determination Parameters
   # obs. used (total)      854  
   data-arc span      10423 days (28.54 yr)  
   first obs. used      1991-06-03  
   last obs. used      2019-12-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52479  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 18:38:46  

Additional Information
 Earth MOID = 1.38873 au 
 Jupiter MOID = 2.379 au 
 T_jup = 3.207 
[ 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 15.0   n/a MPO401192  
diameter diameter 2.756 km 0.510 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.232   0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

136840 (1997 WN28)          Discovered 1997-Nov-30 by Spacewatch at Kitt Peak
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

[ show close-approach data ]
Alternate Designations
 1997 WN28 = 2000 KA11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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