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39503 (1981 EC38)
Classification: Main-belt Asteroid          SPK-ID: 2039503
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 .09900384908418686 6.1912e-08  
a 2.28907431450504 8.7214e-09 au
q 2.062447146529294 1.4019e-07 au
i 2.422806792998017 5.4907e-06 deg
node 233.3561355517944 0.00011388 deg
peri 129.6967204288063 0.00011546 deg
M 291.7089745286729 2.0476e-05 deg
tp 2459240.465826693152
(2021-Jan-25.96582669)
7.2527e-05 TDB
period 1264.993416240408
3.46
7.2294e-06
1.979e-08
d
yr
n .284586461382486 1.6264e-09 deg/d
Q 2.515701482480785 9.5848e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1120  
   data-arc span      13984 days (38.29 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-05-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54681  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:07  

Additional Information
 Earth MOID = 1.06088 au 
 Jupiter MOID = 2.87528 au 
 T_jup = 3.592 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.5   n/a MPO333167  
diameter diameter 1.995 km 0.301 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.280   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39503 (1981 EC38)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EC38 = 1996 RK24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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