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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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06316937422435213 3.4413e-08  
a 2.399019072435165 8.32e-09 au
q 2.24747453887715 8.0693e-08 au
i 3.878420015686614 3.5953e-06 deg
node 213.1851085070759 5.8564e-05 deg
peri 352.292752742864 6.674e-05 deg
M 67.07864110393922 3.2678e-05 deg
tp 2458347.610537667771
(2018-Aug-17.11053767)		 0.00012314 TDB
period 1357.216021990287
3.72		 7.0604e-06
1.933e-08		 d
yr
n .2652488580794077 1.3799e-09 deg/d
Q 2.55056360599318 8.8456e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1744  
   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      .50193  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 21:37:45  

Additional Information
 Earth MOID = 1.2431 au 
 Jupiter MOID = 2.4115 au 
 T_jup = 3.521 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456812.5 (2014-Jun-04.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06241828460520667 3.4545e-08  
q 2.249001645637033 8.0824e-08 au
tp 2456989.407607404992
(2014-Nov-27.90760740)		 0.00012416 TDB
node 213.2128424678454 5.8552e-05 deg
peri 351.9417682406495 6.6852e-05 deg
i 3.87833810986647 3.5965e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1744  
   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      .50193  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 21:37:45  

Additional Information
 Jupiter MOID = 2.4115 au 
 T_jup = 3.521 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.193342948352483E-15 -2.780265704062392E-15 -9.661264956618632E-13 -4.562394192128422E-16 -2.733692862291656E-13 2.734394362311105E-17
q -2.780265704062392E-15 6.532528212027281E-15 2.304119000580089E-12 1.502159660220741E-15 6.474944016165863E-13 -2.813358847053125E-17
tp -9.661264956618632E-13 2.304119000580089E-12 1.541552093205706E-8 2.309349392483756E-11 4.021920613952337E-9 -2.001364947336664E-12
node -4.562394192128422E-16 1.502159660220741E-15 2.309349392483756E-11 3.428306661039115E-9 -3.414228156352711E-9 -4.548934917594896E-11
peri -2.733692862291656E-13 6.474944016165863E-13 4.021920613952337E-9 -3.414228156352711E-9 4.469212663061309E-9 4.487143018621571E-11
i 2.734394362311105E-17 -2.813358847053125E-17 -2.001364947336664E-12 -4.548934917594896E-11 4.487143018621571E-11 1.293467497539307E-11

[ 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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