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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09943332649411092 6.1884e-08  
a 2.287785767040355 8.7199e-09 au
q 2.060303617917651 1.4009e-07 au
i 2.423865925985652 5.5096e-06 deg
node 233.3679971960433 0.00011411 deg
peri 129.9971719214398 0.0001157 deg
M 177.5177045428327 2.0244e-05 deg
tp 2457977.252377817524
(2017-Aug-11.75237782)
6.9842e-05 TDB
period 1263.925446554847
3.46
7.2262e-06
1.978e-08
d
yr
n .2848269262884707 1.6284e-09 deg/d
Q 2.515267916163058 9.587e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1113  
   data-arc span      13953 days (38.20 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54952  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:07:00  

Additional Information
 Earth MOID = 1.05794 au 
 Jupiter MOID = 2.87764 au 
 T_jup = 3.593 
[ 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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