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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0631899133084167 3.111e-08  
a 2.398022588190907 7.574e-09 au
q 2.246491748731499 7.3734e-08 au
i 3.878454471422684 3.464e-06 deg
node 213.1726648542159 5.1891e-05 deg
peri 351.8646441361365 5.9819e-05 deg
M 173.6771494967124 3.1082e-05 deg
tp 2458346.137334034692
(2018-Aug-15.63733403)		 0.00011651 TDB
period 1356.37048644658
3.71		 6.426e-06
1.759e-08		 d
yr
n .2654142091687119 1.2574e-09 deg/d
Q 2.549553427650316 8.0526e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1918  
   data-arc span      23952 days (65.58 yr)  
   first obs. used      1955-04-20  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48844  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:29:00  

Additional Information
 Earth MOID = 1.24201 au 
 Jupiter MOID = 2.41134 au 
 T_jup = 3.522 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457117.5 (2015-Apr-05.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06230298962122362 3.1185e-08  
q 2.24893670822282 7.3854e-08 au
tp 2456989.984021367619
(2014-Nov-28.48402137)		 0.00011695 TDB
node 213.2063067983926 5.1865e-05 deg
peri 352.1193526166634 5.9966e-05 deg
i 3.878692595477756 3.4652e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1918  
   data-arc span      23952 days (65.58 yr)  
   first obs. used      1955-04-20  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48844  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:29:00  

Additional Information
 Jupiter MOID = 2.41134 au 
 T_jup = 3.522 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.725318245883027E-16 -2.292768501624784E-15 -3.505270323920177E-13 4.4050015433142E-16 -9.913810067219568E-14 -3.622430333140639E-17
q -2.292768501624784E-15 5.454447515783155E-15 9.36294015454741E-13 -3.437243284187559E-16 2.612872590674425E-13 1.385630948625539E-16
tp -3.505270323920177E-13 9.36294015454741E-13 1.367834387133956E-8 1.725773565274662E-11 3.532509930258189E-9 -1.577143363093823E-12
node 4.4050015433142E-16 -3.437243284187559E-16 1.725773565274662E-11 2.689979356043161E-9 -2.679124925250479E-9 -2.201973390944561E-11
peri -9.913810067219568E-14 2.612872590674425E-13 3.532509930258189E-9 -2.679124925250479E-9 3.595923934904027E-9 2.157057108443328E-11
i -3.622430333140639E-17 1.385630948625539E-16 -1.577143363093823E-12 -2.201973390944561E-11 2.157057108443328E-11 1.20074227197357E-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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