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39421 (2128 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2039421
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .118542515603471 4.2692e-08  
a 2.224187492872158 7.7854e-09 au
q 1.960526712293315 9.5311e-08 au
i 8.51440808811528 5.2285e-06 deg
node 12.70758415436722 2.6483e-05 deg
peri 292.1605597170546 3.3031e-05 deg
M 74.26974045960283 2.0537e-05 deg
tp 2458750.543218607142
(2019-Sep-24.04321861)
6.8831e-05 TDB
period 1211.589548375677
3.32
6.3615e-06
1.742e-08
d
yr
n .2971303280740871 1.5601e-09 deg/d
Q 2.487848273451001 8.7083e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1205  
   data-arc span      16759 days (45.88 yr)  
   first obs. used      1973-09-19  
   last obs. used      2019-08-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52869  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 05:49:05  

Additional Information
 Earth MOID = .964946 au 
 Jupiter MOID = 2.74472 au 
 T_jup = 3.624 
[ 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 15.1   n/a MPO436046  

39421 (2128 T-2)          Discovered 1973-Sep-29 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 2128 T-2 = 2000 XQ6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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