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JPL Small-Body Database Browser
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39504 (1981 EZ39)
Classification: Main-belt Asteroid          SPK-ID: 2039504
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1346453917294835 4.1072e-08  
a 2.284318220082735 9.3006e-09 au
q 1.976745298504899 9.5433e-08 au
i 4.093218376518866 5.7196e-06 deg
node 1.650126682666143 5.2382e-05 deg
peri 46.79530205675722 5.6336e-05 deg
M 245.760395514364 1.9553e-05 deg
tp 2459400.672759991289
(2021-Jul-05.17275999)
6.8974e-05 TDB
period 1261.052979354263
3.45
7.7016e-06
2.109e-08
d
yr
n .2854757142593187 1.7435e-09 deg/d
Q 2.591891141660572 1.0553e-08 au
  Orbit Determination Parameters
   # obs. used (total)      861  
   data-arc span      13971 days (38.25 yr)  
   first obs. used      1981-03-02  
   last obs. used      2019-06-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54333  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:07  

Additional Information
 Earth MOID = .989061 au 
 Jupiter MOID = 2.76457 au 
 T_jup = 3.588 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456809.5 (2014-Jun-01.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1346404251422749 4.0925e-08  
q 1.975643940036603 9.4994e-08 au
tp 2456880.845332936388
(2014-Aug-11.34533294)
6.7518e-05 TDB
node 1.726409218624224 5.239e-05 deg
peri 46.96036847941001 5.6339e-05 deg
i 4.094148774400413 5.7189e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      861  
   data-arc span      13971 days (38.25 yr)  
   first obs. used      1981-03-02  
   last obs. used      2019-06-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54333  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:07  

Additional Information
 Jupiter MOID = 2.76457 au 
 T_jup = 3.588 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.674828712080845E-15 -3.873891109540245E-15 -1.112392918971891E-12 1.41488250309069E-15 -3.395912364904464E-13 -1.38450868666521E-15
q -3.873891109540245E-15 9.023874388884352E-15 2.521367326828274E-12 -4.308647916066544E-15 7.687596752109101E-13 3.430481540416837E-15
tp -1.112392918971891E-12 2.521367326828274E-12 4.558676628875707E-9 -2.12148128803311E-12 1.407312529084759E-9 -1.357195420128763E-12
node 1.41488250309069E-15 -4.308647916066544E-15 -2.12148128803311E-12 2.744671985834107E-9 -2.737627513728412E-9 -1.274925710826607E-11
peri -3.395912364904464E-13 7.687596752109101E-13 1.407312529084759E-9 -2.737627513728412E-9 3.174100249272247E-9 1.226533432212486E-11
i -1.38450868666521E-15 3.430481540416837E-15 -1.357195420128763E-12 -1.274925710826607E-11 1.226533432212486E-11 3.270632998363276E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.7   n/a MPO474252  

39504 (1981 EZ39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EZ39 = 2000 UV100 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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