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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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06318991819718157 3.17e-08  
a 2.398022589280936 7.6906e-09 au
q 2.24649173802928 7.4933e-08 au
i 3.878454224728858 3.4898e-06 deg
node 213.1726715276529 5.3122e-05 deg
peri 351.8646337465079 6.1055e-05 deg
M 173.6771525592314 3.1322e-05 deg
tp 2458346.137322049887
0.00011748 TDB
period 1356.370487371394
n .2654142089877445 1.2768e-09 deg/d
Q 2.549553440532592 8.1766e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1874  
   data-arc span      23935 days (65.53 yr)  
   first obs. used      1955-04-20  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49112  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:31:51  

Additional Information
 Earth MOID = 1.24201 au 
 Jupiter MOID = 2.41134 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 14.3   n/a MPO435765  
diameter diameter 3.802 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.280   0.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2175-Aug-13 05:18 00:01 Iris 0.0445175283611005 0.0445019540872003 0.0445331026357187 5.43829440608303 5.43829438233765 2515686.720562574 1.21068312616074 776.38958521271 40.1298431671455 -0.395793103452764 8651.00831117891 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 03:31:56 2020-Nov-13 03:31
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Nov-27 19:03 UT
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