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6948 Gounelle (1981 ET22)
Classification: Main-belt Asteroid          SPK-ID: 2006948
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .159729441021339 4.1057e-08  
a 2.394744367697329 7.5414e-09 au
q 2.012233188456035 9.7418e-08 au
i 2.583835302855845 4.935e-06 deg
node 26.3748992154584 9.9715e-05 deg
peri 90.8743688551434 0.00010107 deg
M 249.1194465770316 1.5827e-05 deg
tp 2459417.407830010809
(2021-Jul-21.90783001)
5.9918e-05 TDB
period 1353.590094661284
3.71
6.394e-06
1.751e-08
d
yr
n .2659593930392086 1.2563e-09 deg/d
Q 2.777255546938624 8.746e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1498  
   data-arc span      25047 days (68.57 yr)  
   first obs. used      1950-12-09  
   last obs. used      2019-07-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48442  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:16:22  

Additional Information
 Earth MOID = 1.03042 au 
 Jupiter MOID = 2.30977 au 
 T_jup = 3.511 
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Orbital Elements at Epoch 2455933.5 (2012-Jan-07.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1585704487133203 4.0781e-08  
q 2.015758390051284 9.6659e-08 au
tp 2455353.406226178359
(2010-Jun-05.90622618)
5.942e-05 TDB
node 26.53275138183759 9.9463e-05 deg
peri 90.52773628360035 0.00010087 deg
i 2.587512936109143 4.9369e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1498  
   data-arc span      25047 days (68.57 yr)  
   first obs. used      1950-12-09  
   last obs. used      2019-07-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48442  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:16:22  

Additional Information
 Jupiter MOID = 2.30977 au 
 T_jup = 3.511 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.663066269620888E-15 -3.933605460182335E-15 9.456599079675052E-13 3.419367296182436E-15 2.709363002218811E-13 -1.823747337390135E-15
q -3.933605460182335E-15 9.34303741856416E-15 -2.30116131935735E-12 -8.389970414431442E-15 -6.544830847114285E-13 4.372666693420316E-15
tp 9.456599079675052E-13 -2.30116131935735E-12 3.530741031694985E-9 3.615990827631041E-12 1.014610761215805E-9 -2.155312597568381E-12
node 3.419367296182436E-15 -8.389970414431442E-15 3.615990827631041E-12 9.892798776523059E-9 -9.881272135846125E-9 -1.8217697659469E-10
peri 2.709363002218811E-13 -6.544830847114285E-13 1.014610761215805E-9 -9.881272135846125E-9 1.01740748191053E-8 1.81398164457066E-10
i -1.823747337390135E-15 4.372666693420316E-15 -2.155312597568381E-12 -1.8217697659469E-10 1.81398164457066E-10 2.437278252202594E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO448983  
diameter diameter 3.626 km 0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.256   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6948 Gounelle           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Matthieu Gounelle (b. 1971) is curator of meteorites at Muséum National d´Histoire Naturelle in Paris. His research encompasses both physical and theoretical studies focused on the evolution of the early solar system.
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

Alternate Designations
 1981 ET22 = 1990 QL7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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