Orbit Fit and Astrometric record for 05GH228

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 05GH228   
# Created Mon Nov 19 02:08:43 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   25 observations of   25
# Arc:   9.96y
# First observation: 2005/04/05
#  Last observation: 2015/03/23
# Chi-squared of fit:    75.38 DOF:   44 RMS:  0.31
# Min/Max residuals:    -0.56    0.87
# Exact a, adot, b, bdot, g, gdot:
  1.743214E-05  3.821953E-02 -4.498456E-06 -1.171932E-02  3.292735E-02 -5.030643E-03
# Covariance matrix:
  3.3825E-13 -8.7303E-14 -2.1551E-14  1.7173E-14 -1.4356E-13 -1.3241E-13
 -8.7303E-14  7.0199E-14  2.6223E-14 -2.0106E-14 -6.9149E-15  1.5087E-13
 -2.1551E-14  2.6223E-14  1.2963E-13 -2.6898E-14 -9.3070E-15  6.2363E-14
  1.7173E-14 -2.0106E-14 -2.6898E-14  1.1880E-14  6.4673E-15 -4.7692E-14
 -1.4356E-13 -6.9149E-15 -9.3070E-15  6.4673E-15  1.5620E-13 -4.4873E-14
 -1.3241E-13  1.5087E-13  6.2363E-14 -4.7692E-14 -4.4873E-14  3.5720E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.916191  123.932181   -0.945649    0.010585   -0.313421  2453465.808223
# Heliocentric elements and errors
Epoch:              2453466.5000  =  2005/04/06
Mean Anomaly:          335.73187 +/-     0.007
Argument of Peri:      209.33898 +/-     0.010
Long of Asc Node:      311.87026 +/-     0.000
Inclination:            17.12912 +/-     0.000
Eccentricity:         0.19272441 +/-    0.0000
Semi-Major Axis:     36.86912320 +/-    0.0024
Time of Perihelion: 2458978.7189 +/-       7.5
Perihelion:          29.76354311 +/-    0.0023
Aphelion:            43.97470329 +/-    0.0031
Period (y)              223.8734 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -17.90774234 +/-    0.0002
Ecliptic Y           24.91542439 +/-    0.0003
Ecliptic Z            1.01537093 +/-    0.0000
Ecliptic XDOT        -0.00242118 +/-    0.0000
Ecliptic YDOT        -0.00210087 +/-    0.0000
Ecliptic ZDOT        -0.00098782 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   30.70016410 +/-    0.0003
Geocenter to KBO     30.37001494 +/-    0.0004
# Hcoef:  8.70

The following table shows the complete astrometric record for 05GH228. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (05GH228) followed by the observatory code and reference code for the source of the astrometry.

2005 04  05.30748  08 26 56.56   +21 07 57.7   22.2i 05GH228   568  C~0W4h      
2005 04  06.25340  08 26 55.33   +21 07 52.0         05GH228   568  C~0W4h      
2005 04  06.31853  08 26 55.24   +21 07 51.6   24.3i 05GH228   568  C~0W4h      
2006 01  31.37053  08 40 38.31   +19 46 07.2         05GH228   568  C~0W4h      
2006 02  01.40821  08 40 31.15   +19 46 26.1   23.4r 05GH228   568  C~0W4h      
2006 02  01.45481  08 40 30.82   +19 46 27.0   23.5r 05GH228   568  C~0W4h      
2006 02  01.49483  08 40 30.54   +19 46 27.7   23.1r 05GH228   568  C~0W4h      
2006 11  24.52391  08 54 49.60   +18 14 16.8   23.6i 05GH228   568  C~0W4h      
2006 11  24.57566  08 54 49.50   +18 14 16.7   23.6i 05GH228   568  C~0W4h      
2006 11  24.62784  08 54 49.42   +18 14 17.0   23.1i 05GH228   568  C~0W4h      
2007 01  19.31997  08 50 31.50   +18 25 56.0         05GH228   568  C~0W4h      
2007 01  19.36257  08 50 31.21   +18 25 56.9   23.4g 05GH228   568  C~0W4h      
2007 01  19.39540  08 50 31.00   +18 25 57.6   23.3g 05GH228   568  C~0W4h      
2007 01  20.38314  08 50 24.39   +18 26 17.9   23.4g 05GH228   568  C~0W4h      
2007 01  20.40364  08 50 24.22   +18 26 18.6   23.6g 05GH228   568  C~0W4h      
2007 11  08.43586  09 03 04.45   +16 58 40.0   21.9r 05GH228   695  C~0W4h      
2007 11  09.42347  09 03 05.28   +16 58 29.7   21.7r 05GH228   695  C~0W4h      
2010 01  21.34055  09 15 15.91   +14 27 03.5         05GH228   568  C~0W4h      
2010 03  19.13984  09 09 26.15   +14 47 00.0         05GH228   675  C~0W4h      
2010 03  19.17093  09 09 26.02   +14 47 00.4         05GH228   675  C~0W4h      
2010 03  20.13230  09 09 21.72   +14 47 14.6         05GH228   675  C~0W4h      
2010 03  20.16283  09 09 21.59   +14 47 15.0         05GH228   675  C~0W4h      
2015 03  23.13159  09 49 44.46   +07 45 42.0   22.9R 05GH228   695  C~1Q3L      
2015 03  23.19598  09 49 44.13   +07 45 43.7         05GH228   695  C~1Q3L      
2015 03  23.25978  09 49 43.80   +07 45 45.3         05GH228   695  C~1Q3L      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

  1   0.0000      0.00     0.14       0.00    -0.27
  2   0.0026      0.00     0.05       0.00    -0.16
  3   0.0028      0.00     0.02       0.00    -0.14
  4   0.8243      0.00    -0.40       0.00    -0.16
  5   0.8271      0.00    -0.18       0.00    -0.56
  6   0.8272      0.00    -0.22       0.00    -0.53
  7   0.8273      0.00    -0.21       0.00    -0.56
  8   1.6378      0.00     0.27       0.00     0.52
  9   1.6380      0.00     0.08       0.00     0.36
 10   1.6381      0.00     0.22       0.00     0.60
 11   1.7906      0.00    -0.28       0.00    -0.14
 12   1.7907      0.00    -0.29       0.00    -0.10
 13   1.7908      0.00    -0.08       0.00    -0.07
 14   1.7935      0.00     0.41       0.00     0.58
 15   1.7936      0.00    -0.03       0.00     0.87
 16   2.5931      0.00     0.29       0.00     0.30
 17   2.5958      0.00     0.21       0.00     0.21
 18   4.7968      0.00     0.43       0.00     0.25
 19   4.9523      0.00    -0.29       0.00    -0.13
 20   4.9524      0.00    -0.07       0.00    -0.20
 21   4.9550      0.00     0.06       0.00    -0.28
 22   4.9551      0.00     0.18       0.00    -0.33
 23   9.9626      0.00    -0.01       0.00    -0.05
 24   9.9627      0.00    -0.07       0.00     0.00
 25   9.9629      0.00    -0.16       0.00    -0.02

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

05GH228    quality flag:2

Type:           4:3E  CENTAURS  CENTAURS

axisobj        36.756    36.756    36.756
ecceobj         0.188     0.188     0.188
incobj         17.155    17.155    17.155
qmin           28.437    29.533    29.533
qmax           45.367    44.216    44.217
amean          36.477    36.474    36.478
amin           35.940    35.957    35.972
amax           37.071    37.018    37.019
emean           0.174     0.095     0.120
emin            0.071     0.044     0.039
emax            0.224     0.194     0.194
imean          20.171    21.730    18.948
imin           18.114    18.606    13.537
imax           22.220    23.611    22.175
excite_mean     0.388     0.383     0.347
fracstop        1.000     1.000     1.000
cjmean          2.851     2.852     2.888

libcent 0       177.1    -180.0    -180.0
libamp  0       174.9    -180.0    -180.0
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       197.9     186.7     225.5
kozaiamp        179.9     179.9     179.9