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19939 (1981 EG16)
Classification: Main-belt Asteroid          SPK-ID: 2019939
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1571012189850536 2.9363e-08  
a 2.534174118807929 1.0894e-08 au
q 2.136052275622829 7.4446e-08 au
i 12.68257086785678 4.4089e-06 deg
node 342.9535842525375 1.6287e-05 deg
peri 241.4714380173639 2.3938e-05 deg
M 225.9841650082514 1.9824e-05 deg
tp 2459549.038000996524
(2021-Nov-30.53800100)
8.3035e-05 TDB
period 1473.510054770072
4.03
9.5018e-06
2.601e-08
d
yr
n .2443145866800173 1.5754e-09 deg/d
Q 2.932295961993028 1.2606e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1407  
   data-arc span      14226 days (38.95 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52514  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:58:34  

Additional Information
 Earth MOID = 1.1616 au 
 Jupiter MOID = 2.15325 au 
 T_jup = 3.398 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6   n/a MPO452452  
diameter diameter 3.474 km 0.316 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.254   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19939 (1981 EG16)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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