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21851 (1999 TO142)
Classification: Main-belt Asteroid          SPK-ID: 2021851
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2285629880190779 3.2381e-08  
a 2.457172171193323 8.324e-09 au
q 1.895553557668052 8.0526e-08 au
i 3.29276734581537 4.3821e-06 deg
node 98.1651443956932 6.188e-05 deg
peri 248.8202780833309 6.2695e-05 deg
M 191.4161653964934 1.2184e-05 deg
tp 2459859.317666178614
(2022-Oct-06.81766618)
4.9411e-05 TDB
period 1406.863003099396
3.85
7.1489e-06
1.957e-08
d
yr
n .2558884548153589 1.3003e-09 deg/d
Q 3.018790784718594 1.0227e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1207  
   data-arc span      9784 days (26.79 yr)  
   first obs. used      1994-04-05  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51874  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:43  

Additional Information
 Earth MOID = .889875 au 
 Jupiter MOID = 2.40674 au 
 T_jup = 3.453 
[ 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 14.99   n/a E2021B10  
diameter diameter 5.902 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.030   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21851 (1999 TO142)          Discovered 1999-Oct-07 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TO142 = 1999 RB219 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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