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JPL Small-Body Database Browser
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19947 (1981 EE39)
Classification: Main-belt Asteroid          SPK-ID: 2019947
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0691305499728037 6.0912e-08  
a 3.038205425917041 2.4367e-08 au
q 2.828172613893039 1.9542e-07 au
i 6.916189160651587 5.5555e-06 deg
node 166.7674874880151 3.7902e-05 deg
peri 204.34588229 4.8021e-05 deg
M 307.6120557851801 3.1159e-05 deg
tp 2459281.983527570218
(2021-Mar-08.48352757)
0.00016873 TDB
period 1934.301325315459
5.30
2.327e-05
6.371e-08
d
yr
n .1861137121132297 2.239e-09 deg/d
Q 3.248238237941042 2.6051e-08 au
  Orbit Determination Parameters
   # obs. used (total)      805  
   data-arc span      14082 days (38.55 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-08-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55495  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:58:34  

Additional Information
 Earth MOID = 1.82877 au 
 Jupiter MOID = 2.12838 au 
 T_jup = 3.226 
[ 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 14.4   n/a MPO492963  
diameter diameter 5.973 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.103   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19947 (1981 EE39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EE39 = 1999 RF68 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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