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91781 (1999 TR212)
Classification: Main-belt Asteroid          SPK-ID: 2091781
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557759798686288 3.9915e-08  
a 2.808329704469162 1.8034e-08 au
q 2.370859392961302 1.1776e-07 au
i 15.99700951271003 4.5176e-06 deg
node 213.0709930018967 1.5822e-05 deg
peri 315.8602796776809 2.3079e-05 deg
M 1.532151066191419 1.4665e-05 deg
tp 2458993.184068098606
(2020-May-23.68406810)
7.0028e-05 TDB
period 1718.978984917294
4.71
1.6558e-05
4.533e-08
d
yr
n .2094266440478449 2.0172e-09 deg/d
Q 3.245800015977022 2.0843e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1025  
   data-arc span      8366 days (22.90 yr)  
   first obs. used      1997-06-01  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52291  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:43:10  

Additional Information
 Earth MOID = 1.39936 au 
 Jupiter MOID = 1.82048 au 
 T_jup = 3.248 
[ 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 14.6   n/a MPO426571  
diameter diameter 3.620 km 0.617 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.257   0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91781 (1999 TR212)          Discovered 1999-Oct-15 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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