Orbit Fit and Astrometric record for 12GX17

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: 12GX17    
# Created Sat Dec  4 02:11:28 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     25 observations of     25
# Arc:   8.02y
# First observation: 2012/04/14
#  Last observation: 2020/04/22
# Chi-squared of fit:    32.73 DOF:     44 RMS:  0.20
# Min/Max residuals:    -0.38    0.42
# Exact a, adot, b, bdot, g, gdot:
  1.589783E-05  3.476512E-02  1.018180E-05  2.118361E-02  3.610935E-02  2.370062E-02
# Covariance matrix:
  1.1762E-13 -7.5838E-14  1.5863E-14 -3.6213E-14 -1.8543E-14 -2.6034E-13
 -7.5838E-14  2.1789E-13 -5.3735E-14  1.2594E-13 -2.1223E-13  9.0615E-13
  1.5863E-14 -5.3735E-14  1.0541E-13 -4.8828E-14  5.0074E-14 -2.3364E-13
 -3.6213E-14  1.2594E-13 -4.8828E-14  8.5474E-14 -1.2574E-13  5.4740E-13
 -1.8543E-14 -2.1223E-13  5.0074E-14 -1.2574E-13  9.0265E-13 -9.0657E-13
 -2.6034E-13  9.0615E-13 -2.3364E-13  5.4740E-13 -9.0657E-13  3.9386E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.513359 -165.822821   -0.182660   -0.163579   -0.976043  2456031.839716
# Heliocentric elements and errors
Epoch:              2456032.5000  =  2012/04/15
Mean Anomaly:           36.21607 +/-     0.012
Argument of Peri:      243.53339 +/-     0.010
Long of Asc Node:      209.19170 +/-     0.000
Inclination:            32.60401 +/-     0.000
Eccentricity:         0.55000625 +/-    0.0001
Semi-Major Axis:     37.47450048 +/-    0.0082
Time of Perihelion: 2447603.0154 +/-       3.9
Perihelion:          16.86329095 +/-    0.0045
Aphelion:            58.08571002 +/-    0.0129
Period (y)              229.4098 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -27.39287753 +/-    0.0007
Ecliptic Y           -7.10763708 +/-    0.0002
Ecliptic Z           -4.57683951 +/-    0.0001
Ecliptic XDOT        -0.00133504 +/-    0.0000
Ecliptic YDOT        -0.00305103 +/-    0.0000
Ecliptic ZDOT         0.00128717 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   28.66738623 +/-    0.0007
Geocenter to KBO     27.69340324 +/-    0.0007
# Hcoef:  7.80

The following table shows the complete astrometric record for 12GX17. 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 (12GX17) followed by the observatory code and reference code for the source of the astrometry.

2012 04  14.33895  12 37 02.077  -14 20 34.21  22.3w 12GX17    F51  C~0frl      
2012 04  14.36865  12 37 01.879  -14 20 32.60  22.3w 12GX17    F51  C~0frl      
2012 04  14.38348  12 37 01.780  -14 20 31.87  22.2w 12GX17    F51  C~0frl      
2012 04  18.17323  12 36 38.25   -14 16 56.4   22.5R 12GX17    H01  C~0frl      
2012 04  18.19007  12 36 38.16   -14 16 55.5   22.6R 12GX17    H01  C~0frl      
2012 04  18.20451  12 36 38.08   -14 16 54.5   22.3R 12GX17    H01  C~0frl      
2012 04  18.22192  12 36 37.97   -14 16 53.5   21.8R 12GX17    H01  C~0frl      
2012 04  18.26365  12 36 37.71   -14 16 51.1   22.7R 12GX17    H01  C~0frl      
2012 04  18.27894  12 36 37.60   -14 16 50.5   21.9R 12GX17    H01  C~0frl      
2012 04  18.30916  12 36 37.42   -14 16 48.6   21.7R 12GX17    H01  C~0frl      
2013 03  16.26319  12 49 26.033  -14 25 13.53  22.7r 12GX17    807  C~12zi      
2013 03  16.26319  12 49 26.00   -14 25 14.0   22.4r 12GX17    W84  C~2J9V      
2013 03  16.31084  12 49 25.756  -14 25 11.68  22.7r 12GX17    807  C~12zi      
2013 03  16.31085  12 49 25.72   -14 25 11.9         12GX17    W84  C~2J9V      
2013 03  16.37053  12 49 25.370  -14 25 09.00  22.7r 12GX17    807  C~12zi      
2013 03  16.37053  12 49 25.34   -14 25 09.4         12GX17    W84  C~2J9V      
2013 05  09.08731  12 44 01.334  -13 38 50.50  22.7r 12GX17    807  C~12zi      
2013 05  10.13299  12 43 56.334  -13 37 55.55  22.7r 12GX17    807  C~12zi      
2015 03  16.30954  13 06 38.93   -13 43 52.1   22.1R 12GX17    G37  C~1N7Y      
2015 03  16.38737  13 06 38.49   -13 43 48.9         12GX17    G37  C~1N7Y      
2018 03  22.531680 13 29 03.342  -12 37 29.45  22.7G 12GX17    T14  C~2b0U      
2018 03  22.534808 13 29 03.330  -12 37 29.33  22.7G 12GX17    T14  C~2b0U      
2020 04  22.39538  13 39 54.968  -11 35 37.44  22.6w 12GX17    F51  C~3qIl      
2020 04  22.40701  13 39 54.907  -11 35 37.02  22.4w 12GX17    F51  C~3qIl      
2020 04  22.41872  13 39 54.855  -11 35 36.85  22.7w 12GX17    F51  C~3qIl      

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    -0.21       0.00    -0.12
     2   0.0001      0.00    -0.32       0.00    -0.18
     3   0.0001      0.00    -0.38       0.00    -0.29
     4   0.0105      0.00    -0.11       0.00    -0.01
     5   0.0105      0.00     0.12       0.00    -0.06
     6   0.0106      0.00     0.27       0.00     0.11
     7   0.0106      0.00     0.25       0.00     0.12
     8   0.0107      0.00     0.26       0.00     0.14
     9   0.0108      0.00     0.04       0.00    -0.13
    10   0.0109      0.00     0.17       0.00     0.04
    11   0.9197      0.00    -0.35       0.00    -0.23
    12   0.9197      0.00     0.15       0.00     0.24
    13   0.9198      0.00     0.42       0.00     0.05
    14   0.9198      0.00    -0.12       0.00    -0.17
    15   0.9200      0.00     0.16       0.00     0.17
    16   0.9200      0.00    -0.29       0.00    -0.23
    17   1.0671      0.00    -0.05       0.00     0.39
    18   1.0699      0.00     0.18       0.00     0.24
    19   2.9185      0.00    -0.22       0.00    -0.18
    20   2.9187      0.00    -0.12       0.00    -0.04
    21   5.9362      0.00     0.13       0.00     0.12
    22   5.9362      0.00     0.21       0.00     0.12
    23   8.0221      0.00    -0.20       0.00     0.10
    24   8.0221      0.00    -0.10       0.00     0.03
    25   8.0221      0.00     0.14       0.00    -0.29

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.

12GX17    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        37.521    37.522    37.521
ecceobj         0.550     0.550     0.550
incobj         32.585    32.585    32.585
qmin           16.751    16.686    16.753
qmax           60.257    58.448    59.005
amean          38.188    36.695    37.517
amin           36.983    36.039    36.880
amax           38.845    37.684    38.917
emean           0.504     0.534     0.529
emin            0.453     0.520     0.505
emax            0.556     0.551     0.550
imean          35.968    33.480    34.100
imin           32.903    32.903    32.903
imax           38.434    33.889    35.438
excite_mean     0.775     0.768     0.771
fracstop        0.046     0.011     0.022
cjmean          2.372     2.388     2.381

libcent 0      -180.0    -180.0    -180.0
libamp  0      -180.0    -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       259.4     250.7     253.8
kozaiamp         16.7       7.5      10.9