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39507 (1981 EC45)
Classification: Main-belt Asteroid          SPK-ID: 2039507
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1185218820929017 4.8752e-08  
a 2.982493348221053 2.0328e-08 au
q 2.629002623260333 1.5221e-07 au
i 11.49864673724304 4.7466e-06 deg
node 199.2812493665132 2.3706e-05 deg
peri 199.7788086551047 3.2807e-05 deg
M 351.3889821682371 2.4599e-05 deg
tp 2459045.500738430002
(2020-Jul-15.00073843)
0.0001287 TDB
period 1881.341573239325
5.15
1.9234e-05
5.266e-08
d
yr
n .1913528118023491 1.9563e-09 deg/d
Q 3.335984073181772 2.2737e-08 au
  Orbit Determination Parameters
   # obs. used (total)      587  
   data-arc span      14134 days (38.70 yr)  
   first obs. used      1981-03-07  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54665  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 03:09:44  

Additional Information
 Earth MOID = 1.63877 au 
 Jupiter MOID = 2.10637 au 
 T_jup = 3.218 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457332.5 (2015-Nov-06.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .118239506706299 4.9185e-08  
q 2.630075905845036 1.5374e-07 au
tp 2457148.539659455182
(2015-May-06.03965946)
0.00012289 TDB
node 199.3843704774521 2.3644e-05 deg
peri 197.2679230124501 3.2757e-05 deg
i 11.50955239993281 4.7605e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      587  
   data-arc span      14134 days (38.70 yr)  
   first obs. used      1981-03-07  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54665  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 03:09:44  

Additional Information
 Jupiter MOID = 2.10637 au 
 T_jup = 3.218 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.4191289689829E-15 -7.514876548864679E-15 -2.347962799071403E-12 -4.137888392680488E-15 -3.252420116020764E-13 -2.685785750625631E-15
q -7.514876548864679E-15 2.363547491414168E-14 7.501021787612478E-12 1.440671771220754E-14 1.050724226463284E-12 9.172587784646884E-15
tp -2.347962799071403E-12 7.501021787612478E-12 1.510116575761989E-8 3.277742542670364E-12 2.803006822549755E-9 1.312227799332076E-11
node -4.137888392680488E-15 1.440671771220754E-14 3.277742542670364E-12 5.590609586504008E-10 -5.469632461656623E-10 -3.043650155140779E-11
peri -3.252420116020764E-13 1.050724226463284E-12 2.803006822549755E-9 -5.469632461656623E-10 1.073046775448904E-9 3.222861860166888E-11
i -2.685785750625631E-15 9.172587784646884E-15 1.312227799332076E-11 -3.043650155140779E-11 3.222861860166888E-11 2.266269661521434E-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 14.7   n/a MPO439361  

39507 (1981 EC45)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EC45 = 1999 VV184 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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