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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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06318992478316925 3.4214e-08  
a 2.398022590699052 8.2126e-09 au
q 2.246491723564438 8.0054e-08 au
i 3.87845447652969 3.5518e-06 deg
node 213.1726634538852 5.8269e-05 deg
peri 351.8646363398377 6.6439e-05 deg
M 173.6771571041978 3.2592e-05 deg
tp 2458346.137304345382
(2018-Aug-15.63730435)		 0.00012262 TDB
period 1356.370488574566
3.71		 6.9679e-06
1.908e-08		 d
yr
n .2654142087523081 1.3635e-09 deg/d
Q 2.549553457833666 8.7316e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1762  
   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      .50203  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:16:21  

Additional Information
 Earth MOID = 1.24201 au 
 Jupiter MOID = 2.41134 au 
 T_jup = 3.522 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456856.5 (2014-Jul-18.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06235150664821509 3.4287e-08  
q 2.248959417274631 8.0142e-08 au
tp 2456989.577248013371
(2014-Nov-28.07724801)		 0.00012405 TDB
node 213.2091066358771 5.8242e-05 deg
peri 351.9951736503079 6.6581e-05 deg
i 3.878519700467148 3.5531e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1762  
   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      .50203  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:16:21  

Additional Information
 Jupiter MOID = 2.41134 au 
 T_jup = 3.522 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.175589436329029E-15 -2.73616718278221E-15 -9.368051240156178E-13 -3.951354685691044E-16 -2.666522687947299E-13 2.936646525234152E-17
q -2.73616718278221E-15 6.4227793243181E-15 2.227335176146874E-12 1.35878442186646E-15 6.298586929410468E-13 -1.887873574392533E-17
tp -9.368051240156178E-13 2.227335176146874E-12 1.538793453434728E-8 2.221141857116872E-11 4.018235442910308E-9 -1.933442039094609E-12
node -3.951354685691044E-16 1.35878442186646E-15 2.221141857116872E-11 3.392132097767588E-9 -3.378358107758214E-9 -4.226680307427032E-11
peri -2.666522687947299E-13 6.298586929410468E-13 4.018235442910308E-9 -3.378358107758214E-9 4.43308299721889E-9 4.167340345508593E-11
i 2.936646525234152E-17 -1.887873574392533E-17 -1.933442039094609E-12 -4.226680307427032E-11 4.167340345508593E-11 1.262431477742469E-11

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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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