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187789 (1998 UN31)
Classification: Inner Main-belt Asteroid          SPK-ID: 2187789
[ 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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09219105299745192 4.1452e-08  
a 1.907764956861428 7.3186e-09 au
q 1.731886096616735 7.9842e-08 au
i 20.14360882779225 4.9643e-06 deg
node 222.1115447023364 1.0857e-05 deg
peri 108.2472361800659 3.7375e-05 deg
M 194.1554568479278 3.1364e-05 deg
tp 2459643.888488051581
(2022-Mar-05.38848805)		 8.2648e-05 TDB
period 962.4667333926358
2.64		 5.5384e-06
1.516e-08		 d
yr
n .3740389018236737 2.1523e-09 deg/d
Q 2.083643817106122 7.9933e-09 au
   Orbit Determination Parameters
   # obs. used (total)      512  
   data-arc span      7735 days (21.18 yr)  
   first obs. used      1998-10-18  
   last obs. used      2019-12-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52641  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:56:50  

Additional Information
 Earth MOID = .80314 au 
 Jupiter MOID = 3.13705 au 
 T_jup = 3.860 
[ 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 17.2   n/a MPO433236  

187789 (1998 UN31)          Discovered 1998-Oct-22 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20080618/Numbers.arcLast Updated: 2008-06-20

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Alternate Designations
 1998 UN31 = 2006 UJ217 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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