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39499 (1981 EJ29)
Classification: Main-belt Asteroid          SPK-ID: 2039499
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04480546147087538 4.3166e-08  
a 3.015529104676842 1.9871e-08 au
q 2.88041693156294 1.3567e-07 au
i 9.686891708225884 6.5172e-06 deg
node 197.2712060618423 2.4634e-05 deg
peri 287.894387972488 7.3245e-05 deg
M 221.980324304814 6.9347e-05 deg
tp 2459733.800895592570
(2022-Jun-03.30089559)
0.00036943 TDB
period 1912.686152055151
5.24
1.8905e-05
5.176e-08
d
yr
n .1882169741299093 1.8604e-09 deg/d
Q 3.150641277790744 2.0761e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1129  
   data-arc span      14509 days (39.72 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5243  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:21:02  

Additional Information
 Earth MOID = 1.91281 au 
 Jupiter MOID = 1.8915 au 
 T_jup = 3.225 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456996.5 (2014-Dec-05.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04161811642304367 4.2112e-08  
q 2.892588517712454 1.3196e-07 au
tp 2457804.275298908031
(2017-Feb-19.77529891)
0.00040448 TDB
node 197.429039813183 2.4562e-05 deg
peri 284.9553834838499 7.9873e-05 deg
i 9.697312254318392 6.5256e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1129  
   data-arc span      14509 days (39.72 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5243  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:21:02  

Additional Information
 Jupiter MOID = 1.8915 au 
 T_jup = 3.225 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.773434324220477E-15 -5.501726752892202E-15 4.875863070274059E-12 1.106639631092557E-15 9.778310791427423E-13 -1.32220315964413E-15
q -5.501726752892202E-15 1.741329668289617E-14 -1.382235847886954E-11 -2.11153695113198E-15 -2.818853998496236E-12 4.956545143524512E-15
tp 4.875863070274059E-12 -1.382235847886954E-11 1.636071924948633E-7 5.50365912489842E-11 3.074500603542788E-8 -2.599287866356394E-12
node 1.106639631092557E-15 -2.11153695113198E-15 5.50365912489842E-11 6.032947788488922E-10 -5.837736428395225E-10 -1.930084860697622E-11
peri 9.778310791427423E-13 -2.818853998496236E-12 3.074500603542788E-8 -5.837736428395225E-10 6.379656427497699E-9 1.841848716521789E-11
i -1.32220315964413E-15 4.956545143524512E-15 -2.599287866356394E-12 -1.930084860697622E-11 1.841848716521789E-11 4.258329035534633E-11

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 14.0   n/a MPO347804  
diameter diameter 5.596 km 1.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.170   0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

39499 (1981 EJ29)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EJ29 = 1992 HK7 = 1994 TN17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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