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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06302595668233964 2.8851e-08  
a 2.398452257336965 7.1339e-09 au
q 2.247287509261386 6.9185e-08 au
i 3.878030487881346 3.294e-06 deg
node 213.1718288149851 4.6356e-05 deg
peri 351.7758729117448 5.4505e-05 deg
M 226.8476498298205 3.0358e-05 deg
tp 2459702.312389156082
(2022-May-02.81238916)
0.00011514 TDB
period 1356.735047224483
3.71
6.0532e-06
1.657e-08
d
yr
n .2653428911831118 1.1838e-09 deg/d
Q 2.549617005412544 7.5836e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2075  
   data-arc span      24015 days (65.75 yr)  
   first obs. used      1955-04-20  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47565  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:34:20  

Additional Information
 Earth MOID = 1.2419 au 
 Jupiter MOID = 2.41014 au 
 T_jup = 3.522 
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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 14.29   n/a E2021B10  
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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