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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1406138571522077 3.942e-08  
a 2.406903676105589 7.2141e-09 au
q 2.068459666414554 9.4392e-08 au
i 1.787244702431926 4.1482e-06 deg
node 346.9975182967661 9.0554e-05 deg
peri 18.35705032182462 9.1171e-05 deg
M 228.9967193694076 1.0767e-05 deg
tp 2459696.825013411984
(2022-Apr-27.32501341)
4.1592e-05 TDB
period 1363.912445308555
3.73
6.132e-06
1.679e-08
d
yr
n .2639465614074354 1.1867e-09 deg/d
Q 2.745347685796624 8.2285e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      17046 days (46.67 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51758  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:06  

Additional Information
 Earth MOID = 1.06504 au 
 Jupiter MOID = 2.71297 au 
 T_jup = 3.508 
[ 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 15.15   n/a E2021B10  
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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