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212902 (2007 WY31)
Classification: Main-belt Asteroid          SPK-ID: 2212902
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1893362924248705 4.1858e-08  
a 2.755303208260468 2.3352e-08 au
q 2.23362431430208 1.1457e-07 au
i 6.984706891272712 6.9226e-06 deg
node 278.3818885795903 4.3553e-05 deg
peri 290.1942272960703 4.847e-05 deg
M 134.7088776213087 1.8785e-05 deg
tp 2458375.404689792036
(2018-Sep-13.90468979)
8.6063e-05 TDB
period 1670.523247231558
4.57
2.1237e-05
5.814e-08
d
yr
n .2155013410298856 2.7397e-09 deg/d
Q 3.276982102218855 2.7774e-08 au
  Orbit Determination Parameters
   # obs. used (total)      286  
   data-arc span      7078 days (19.38 yr)  
   first obs. used      2000-04-07  
   last obs. used      2019-08-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52989  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 04:03:17  

Additional Information
 Earth MOID = 1.24006 au 
 Jupiter MOID = 1.77324 au 
 T_jup = 3.307 
[ 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 15.8   n/a MPO437022  
diameter diameter 3.953 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.054   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

212902 (2007 WY31)          Discovered 2007-Nov-19 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20090409/Numbers.arcLast Updated: 2009-04-10

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