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21842 (1999 TH102)
Classification: Main-belt Asteroid          SPK-ID: 2021842
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1936706889374985 1.9004e-08  
a 3.096934303705124 1.3748e-08 au
q 2.49714890351238 6.0881e-08 au
i 16.41212010641569 5.6651e-07 deg
node 125.2986297133753 1.706e-06 deg
peri 115.8578554496894 4.1762e-06 deg
M 91.10117447948241 4.1025e-06 deg
tp 2458696.746715267515
(2019-Aug-01.24671527)
2.0286e-05 TDB
period 1990.656910186574
5.45
1.3256e-05
3.629e-08
d
yr
n .1808448247198253 1.2042e-09 deg/d
Q 3.696719703897868 1.6411e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2411  
   data-arc span      12228 days (33.48 yr)  
   first obs. used      1987-07-29  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40357  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:04:50  

Additional Information
 Earth MOID = 1.53216 au 
 Jupiter MOID = 1.67486 au 
 T_jup = 3.132 
[ 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 12.36   n/a E2021B10  
diameter diameter 10.114 km 0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.458 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.144   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21842 (1999 TH102)          Discovered 1999-Oct-02 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TH102 = 1987 OQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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