Orbit Fit and Astrometric record for 15GX55

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: 15GX55    
# Created Sat Dec  4 02:13:20 2021
# Orbit generated from Bernstein formalism
# Fitting     35 observations of     35
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000594   0.020380  -0.000440  -0.027320   0.032138   0.000000
# Chi-squared of fit:     7.98 DOF:     64 RMS:  0.08
# Min/Max residuals:    -0.27    0.28
# Exact a, adot, b, bdot, g, gdot:
  9.652196E-06  2.063055E-02 -1.416624E-05 -2.907886E-02  3.315772E-02  3.640941E-02
# Covariance matrix:
  1.6549E-13 -3.5848E-14  1.8902E-14 -8.5257E-14  1.1864E-13  1.5861E-12
 -3.5848E-14  1.1774E-13  1.9494E-14 -8.6153E-14  7.4271E-14  1.5967E-12
  1.8902E-14  1.9494E-14  1.2386E-13 -1.7292E-13  4.8252E-14  1.8536E-12
 -8.5257E-14 -8.6153E-14 -1.7292E-13  5.2953E-13 -2.1489E-13 -8.0788E-12
  1.1864E-13  7.4271E-14  4.8252E-14 -2.1489E-13  2.2821E-13  3.9882E-12
  1.5861E-12  1.5967E-12  1.8536E-12 -8.0788E-12  3.9882E-12  1.4932E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.379410 -153.067931    0.841045    0.021447   -0.512822  2457071.101558
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:            2.54631 +/-     0.015
Argument of Peri:       82.65209 +/-     0.003
Long of Asc Node:       27.10341 +/-     0.000
Inclination:            53.26059 +/-     0.001
Eccentricity:         0.92313932 +/-    0.0003
Semi-Major Axis:    192.79368275 +/-    0.7372
Time of Perihelion: 2450154.6441 +/-       1.5
Perihelion:          14.81825382 +/-    0.0817
Aphelion:           370.76911168 +/-    1.4191
Period (y)             2676.9940 +/-     15.36
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -27.70624268 +/-    0.0004
Ecliptic Y          -13.13051882 +/-    0.0002
Ecliptic Z            1.25167165 +/-    0.0000
Ecliptic XDOT        -0.00199894 +/-    0.0000
Ecliptic YDOT        -0.00292994 +/-    0.0000
Ecliptic ZDOT        -0.00227408 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   30.68571475 +/-    0.0004
Geocenter to KBO     30.15888596 +/-    0.0004
# Hcoef:  9.41

The following table shows the complete astrometric record for 15GX55. 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 (15GX55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.60078  13 43 25.720  -08 09 32.40  24.4r 15GX55    568  C~2lVC      
2015 02  17.64179  13 43 25.566  -08 09 32.16  24.5r 15GX55    568  C~2lVC      
2015 02  20.63493  13 43 14.896  -08 09 10.73  24.4r 15GX55    568  C~2lVC      
2015 03  18.57924  13 41 04.944  -08 02 55.49  24.2r 15GX55    568  C~2lVC      
2015 03  18.62665  13 41 04.649  -08 02 54.52  24.3r 15GX55    568  C~2lVC      
2015 03  20.58351  13 40 52.609  -08 02 15.39  24.2r 15GX55    568  C~2lVC      
2015 04  11.51839  13 38 25.268  -07 54 05.68  24.1r 15GX55    568  C~2lVD      
2015 04  13.38199  13 38 12.160  -07 53 22.35  24.1r 15GX55    568  C~2lVD      
2015 04  13.44320  13 38 11.727  -07 53 20.93  23.9r 15GX55    568  C~2lVD      
2015 04  13.52553  13 38 11.140  -07 53 19.00  24.2r 15GX55    568  C~2lVD      
2015 04  19.49336  13 37 29.034  -07 51 01.20  24.0r 15GX55    568  C~2lVD      
2015 04  19.54045  13 37 28.711  -07 50 59.98  24.1r 15GX55    568  C~2lVD      
2015 05  18.33721  13 34 18.158  -07 41 39.38  24.1r 15GX55    568  C~2lVD      
2015 06  20.28725  13 31 51.048  -07 38 30.92  24.6r 15GX55    568  C~2lVD      
2015 06  20.32802  13 31 50.932  -07 38 31.02  24.5r 15GX55    568  C~2lVD      
2015 07  20.27721  13 31 19.159  -07 45 40.62  24.2r 15GX55    568  C~2lVD      
2016 02  04.61430  13 45 58.544  -10 03 59.55  25.0w 15GX55    568  C~2lVD      
2016 02  04.62644  13 45 58.521  -10 04 00.03  25.2w 15GX55    568  C~2lVD      
2016 02  04.63139  13 45 58.506  -10 03 59.65  25.1w 15GX55    568  C~2lVD      
2016 02  11.59752  13 45 43.858  -10 04 19.66  25.1w 15GX55    568  C~2lVD      
2016 03  11.60894  13 43 45.584  -10 00 32.19  24.4w 15GX55    568  C~2lVD      
2016 04  03.47768  13 41 25.002  -09 53 17.77  24.6w 15GX55    568  C~2lVD      
2016 04  09.45883  13 40 44.616  -09 51 04.89  24.4w 15GX55    568  C~2lVD      
2016 05  02.34368  13 38 09.399  -09 42 35.04  24.8w 15GX55    568  C~2lVD      
2016 05  02.35991  13 38 09.301  -09 42 34.72  25.1w 15GX55    568  C~2lVD      
2016 05  07.34704  13 37 37.055  -09 40 52.89  24.7w 15GX55    568  C~2lVD      
2016 05  07.36327  13 37 36.960  -09 40 52.64  24.7w 15GX55    568  C~2lVD      
2016 05  28.31649  13 35 37.073  -09 35 12.61  24.4w 15GX55    568  C~2lVD      
2016 05  29.32340  13 35 32.111  -09 35 00.78  24.9w 15GX55    568  C~2lVD      
2016 06  27.31141  13 33 51.230  -09 33 17.67  24.5w 15GX55    568  C~2lVD      
2016 07  07.30770  13 33 37.432  -09 34 40.45  24.8w 15GX55    568  C~2lVD      
2017 03  29.48279  13 44 00.543  -11 43 32.90  24.7w 15GX55    568  C~2lVD      
2017 03  29.50431  13 44 00.393  -11 43 32.44  23.8w 15GX55    568  C~2lVD      
2017 05  24.25153  13 38 08.898  -11 24 19.28  24.9w 15GX55    568  C~2lVD      
2017 06  24.29454  13 36 09.032  -11 19 45.76  24.8w 15GX55    568  C~2lVD      

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     0.04       0.00     0.06
     2   0.0001     -2.22    -0.09      -0.60    -0.01
     3   0.0083   -157.81     0.07     -37.36    -0.05
     4   0.0793  -2093.78    -0.10    -379.93    -0.04
     5   0.0795  -2098.22    -0.13    -380.60    -0.02
     6   0.0848  -2279.17    -0.05    -408.41    -0.02
     7   0.1449  -4497.97    -0.09    -740.59     0.04
     8   0.1500  -4695.33    -0.09    -770.54    -0.04
     9   0.1502  -4701.85    -0.01    -771.54    -0.02
    10   0.1504  -4710.68     0.02    -772.90     0.01
    11   0.1667  -5344.22     0.14    -870.60    -0.00
    12   0.1668  -5349.14     0.28    -871.20     0.20
    13   0.2457  -8194.96    -0.02   -1375.93    -0.12
    14   0.3359 -10304.85    -0.01   -1997.64    -0.02
    15   0.3360 -10306.42    -0.00   -1998.36     0.06
    16   0.4180 -10590.29    -0.06   -2571.57     0.02
    17   0.9638   4570.44    -0.01   -5606.63     0.13
    18   0.9638   4570.29     0.12   -5607.20    -0.27
    19   0.9638   4569.95    -0.11   -5606.92     0.08
    20   0.9829   4374.84     0.09   -5702.82    -0.01
    21   1.0623   2660.88    -0.13   -6114.74    -0.00
    22   1.1249    565.22    -0.00   -6454.56    -0.00
    23   1.1413    -39.75    -0.03   -6545.37     0.05
    24   1.2040  -2364.95     0.02   -6898.26    -0.01
    25   1.2040  -2366.42     0.17   -6898.48     0.02
    26   1.2176  -2848.11    -0.02   -6976.23    -0.04
    27   1.2177  -2849.51     0.15   -6976.50    -0.06
    28   1.2751  -4626.87     0.04   -7303.39     0.05
    29   1.2778  -4699.64    -0.02   -7319.08     0.07
    30   1.3572  -6129.25    -0.04   -7767.23    -0.08
    31   1.3846  -6289.50    -0.05   -7919.05    -0.05
    32   2.1106   5084.69     0.10  -11820.21     0.04
    33   2.1106   5082.46    -0.08  -11820.57     0.02
    34   2.2632   -161.72    -0.05  -12604.67     0.08
    35   2.3482  -1907.12    -0.06  -12990.68    -0.08

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.

15GX55    quality flag:2

Type:       CENTAURR  CENTAURS  CENTAURR

axisobj       189.534   191.714   187.412
ecceobj         0.922     0.923     0.921
incobj         53.342    53.342    53.342
qmin           13.866    13.854    13.819
qmax          385.825   385.137   472.545
amean         186.117   164.397   216.245
amin          183.445   151.144   179.023
amax          200.324   199.967   244.605
emean           0.920     0.889     0.927
emin            0.915     0.866     0.914
emax            0.926     0.926     0.939
imean          53.074    57.069    53.792
imin           52.720    52.742    52.537
imax           53.456    60.697    55.298
excite_mean     1.219     1.222     1.229
fracstop        0.003     1.000     0.392
cjmean          1.313     1.340     1.328

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        82.4      72.8      82.7
kozaiamp          0.9      13.2       2.7