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6947 Andrewdavis (1981 ET8)
Classification: Main-belt Asteroid          SPK-ID: 2006947
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06316937411075352 3.441e-08  
a 2.399019072437087 8.3193e-09 au
q 2.247474539151475 8.0683e-08 au
i 3.878420042304533 3.5945e-06 deg
node 213.1851087136688 5.8561e-05 deg
peri 352.2927525082832 6.6737e-05 deg
M 67.07864111635739 3.2678e-05 deg
tp 2458347.610537620650
(2018-Aug-17.11053762)
0.00012314 TDB
period 1357.216021991918
3.72
7.0598e-06
1.933e-08
d
yr
n .265248858079089 1.3797e-09 deg/d
Q 2.550563605722698 8.8448e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1747  
   data-arc span      23597 days (64.61 yr)  
   first obs. used      1955-04-20  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50195  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 22:18:49  

Additional Information
 Earth MOID = 1.2431 au 
 Jupiter MOID = 2.4115 au 
 T_jup = 3.521 
[ 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 14.3   n/a MPO435765  
diameter diameter 3.802 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.280   0.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6947 Andrewdavis           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Andrew M. Davis (b. 1950) is a meteoriticist at the University of Chicago. His work on the trace elemental and isotopic composition of meteorites has addressed fundamental questions about timescales and processes in the solar nebula.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

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