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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1569531331439067 2.6621e-08  
a 2.534392625638442 9.3988e-09 au
q 2.136611762427676 6.9483e-08 au
i 12.6830915312443 4.1676e-06 deg
node 342.948058523185 1.5169e-05 deg
peri 241.4633264690644 2.2625e-05 deg
M 274.8438843976581 1.8638e-05 deg
tp 2459549.096171676027
(2021-Nov-30.59617168)
7.7159e-05 TDB
period 1473.700636950127
4.03
8.1979e-06
2.244e-08
d
yr
n .2442829913848936 1.3589e-09 deg/d
Q 2.932173488849207 1.0874e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1644  
   data-arc span      14640 days (40.08 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50668  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:09:49  

Additional Information
 Earth MOID = 1.16119 au 
 Jupiter MOID = 2.1522 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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