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91638 (1999 TQ82)
Classification: Main-belt Asteroid          SPK-ID: 2091638
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2101434908998694 4.9511e-08  
a 3.073738157720724 1.6804e-08 au
q 2.427812091145158 1.594e-07 au
i 6.389383684643269 4.1236e-06 deg
node 25.77340518355519 4.1456e-05 deg
peri 320.3328008578274 4.2776e-05 deg
M 321.3051476837733 9.5014e-06 deg
tp 2459212.067728054966
(2020-Dec-28.56772806)
5.2412e-05 TDB
period 1968.333706957925
5.39
1.6141e-05
4.419e-08
d
yr
n .1828958162568799 1.4998e-09 deg/d
Q 3.71966422429629 2.0335e-08 au
  Orbit Determination Parameters
   # obs. used (total)      685  
   data-arc span      7681 days (21.03 yr)  
   first obs. used      1999-09-09  
   last obs. used      2020-09-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54694  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:39:07  

Additional Information
 Earth MOID = 1.4254 au 
 Jupiter MOID = 1.72538 au 
 T_jup = 3.186 
[ 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 14.8   n/a MPO474794  
diameter diameter 4.978 km 0.770 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 7.146 h n/a LCDB (Rev. 2019-August); 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 0.086   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

91638 (1999 TQ82)          Discovered 1999-Oct-12 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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