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JPL Small-Body Database Browser
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20940 (1236 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2020940
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1401799584087976 3.9408e-08  
a 2.407818461854578 7.7229e-09 au
q 2.070290570015868 9.4351e-08 au
i 1.786792768484826 4.177e-06 deg
node 347.0030967153293 0.00010366 deg
peri 18.42631902099781 0.00010441 deg
M 70.60216612505053 1.1544e-05 deg
tp 2458332.860899301980
(2018-Aug-02.36089930)
4.3663e-05 TDB
period 1364.690087279078
3.74
6.5657e-06
1.798e-08
d
yr
n .2637961566188033 1.2692e-09 deg/d
Q 2.745346353693288 8.8055e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1493  
   data-arc span      16845 days (46.12 yr)  
   first obs. used      1973-09-19  
   last obs. used      2019-11-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5301  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 00:11:06  

Additional Information
 Earth MOID = 1.06761 au 
 Jupiter MOID = 2.70862 au 
 T_jup = 3.507 
[ 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 MPO263534  
diameter diameter 4.481 km 0.205 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20940 (1236 T-2)          Discovered 1973-Sep-29 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1236 T-2 = 1998 HJ38 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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