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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1599605774198938 3.2942e-08  
a 2.395267386159577 6.2124e-09 au
q 2.012119031994452 8.0327e-08 au
i 2.58374944625401 4.6795e-06 deg
node 26.37211821309068 7.3689e-05 deg
peri 90.82805819802611 7.5565e-05 deg
M 354.4896177136588 1.5329e-05 deg
tp 2459417.225673738647
(2021-Jul-21.72567374)
5.7664e-05 TDB
period 1354.033560322574
3.71
5.2678e-06
1.442e-08
d
yr
n .2658722874743493 1.0344e-09 deg/d
Q 2.778415740324703 7.2062e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2044  
   data-arc span      25691 days (70.34 yr)  
   first obs. used      1950-12-09  
   last obs. used      2021-04-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4395  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 15:18:38  

Additional Information
 Earth MOID = 1.03074 au 
 Jupiter MOID = 2.30825 au 
 T_jup = 3.510 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456930.5 (2014-Sep-30.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1588395321343661 3.267e-08  
q 2.01479367588179 7.9546e-08 au
tp 2456706.778146581812
(2014-Feb-18.27814658)
5.8342e-05 TDB
node 26.49204534087685 7.353e-05 deg
peri 90.31444079501857 7.5475e-05 deg
i 2.587092223702778 4.6824e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2044  
   data-arc span      25691 days (70.34 yr)  
   first obs. used      1950-12-09  
   last obs. used      2021-04-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4395  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 15:18:38  

Additional Information
 Jupiter MOID = 2.30825 au 
 T_jup = 3.510 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.067318618995025E-15 -2.59339084389563E-15 7.989156738205512E-13 -7.008616919874284E-16 2.617625180051688E-13 -9.633579271285015E-16
q -2.59339084389563E-15 6.327505189951308E-15 -1.929937639418359E-12 1.10142337160754E-15 -6.315525790536816E-13 2.422579845486271E-15
tp 7.989156738205512E-13 -1.929937639418359E-12 3.40374055076909E-9 -1.170487955731373E-12 1.000264967197658E-9 -1.33673088770899E-12
node -7.008616919874284E-16 1.10142337160754E-15 -1.170487955731373E-12 5.40662375936848E-9 -5.400900498442581E-9 -9.626180311136784E-11
peri 2.617625180051688E-13 -6.315525790536816E-13 1.000264967197658E-9 -5.400900498442581E-9 5.69648794574776E-9 9.576016114673497E-11
i -9.633579271285015E-16 2.422579845486271E-15 -1.33673088770899E-12 -9.626180311136784E-11 9.576016114673497E-11 2.19246729333379E-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)  
rotation period rot_per 12.115 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
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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