Orbit Fit and Astrometric record for 01XZ255

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: 01XZ255   
# Created Tue Jun 10 01:09:06 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     19 observations of     21
# Arc:  15.13y
# First observation: 2001/12/11
#  Last observation: 2017/01/28
# Chi-squared of fit:    21.37 DOF:     32 RMS:  0.19
# Min/Max residuals:    -0.53    0.49
# Exact a, adot, b, bdot, g, gdot:
  2.468048E-05  1.033621E-01  5.524241E-07  4.218583E-03  6.613525E-02  6.304779E-03
# Covariance matrix:
  1.8794E-13 -8.8520E-14  1.6305E-15 -3.5929E-15  9.8089E-14 -2.4114E-14
 -8.8520E-14  9.2263E-14 -1.8478E-15  4.0078E-15 -1.0707E-13  2.6787E-14
  1.6305E-15 -1.8478E-15  1.1448E-13 -6.7661E-15  1.8484E-15 -5.2574E-16
 -3.5929E-15  4.0078E-15 -6.7661E-15  1.1178E-15 -4.7168E-15  1.1765E-15
  9.8089E-14 -1.0707E-13  1.8484E-15 -4.7168E-15  1.5237E-13 -3.2780E-14
 -2.4114E-14  2.6787E-14 -5.2574E-16  1.1765E-15 -3.2780E-14  7.9277E-15
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.164922  104.210840    0.408107    0.018011   -0.889573  2452255.037583
# Heliocentric elements and errors
Epoch:              2452254.5000  =  2001/12/11
Mean Anomaly:           87.10883 +/-     0.232
Argument of Peri:      293.75788 +/-     0.000
Long of Asc Node:       77.81368 +/-     0.000
Inclination:             2.60718 +/-     0.000
Eccentricity:         0.03555959 +/-    0.0006
Semi-Major Axis:     16.02879096 +/-    0.0001
Time of Perihelion: 2446582.8519 +/-      15.1
Perihelion:          15.45881378 +/-    0.0090
Aphelion:            16.59876814 +/-    0.0090
Period (y)               64.1740 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -3.53263904 +/-    0.0002
Ecliptic Y           15.62301117 +/-    0.0002
Ecliptic Z            0.30740508 +/-    0.0000
Ecliptic XDOT        -0.00421980 +/-    0.0000
Ecliptic YDOT        -0.00080098 +/-    0.0000
Ecliptic ZDOT         0.00018012 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   16.02036486 +/-    0.0002
Geocenter to KBO     15.12054210 +/-    0.0003
# Hcoef: 10.86

The following table shows the complete astrometric record for 01XZ255. 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 (01XZ255) followed by the observatory code and reference code for the source of the astrometry.

2001 12  11.53684  07 02 15.64   +23 50 22.6   23.2R 01XZ255   568  Cf2430      
2001 12  11.56015  07 02 15.38   +23 50 22.9         01XZ255   568  Cf2430      
2001 12  11.58345  07 02 15.10   +23 50 23.3         01XZ255   568  Cf2430      
2001 12  19.42206  07 00 41.35   +23 53 12.0   22.6R 01XZ255   568  Cf2430      
2001 12  19.45198  07 00 40.97   +23 53 12.5   22.7R 01XZ255   568  Cf2430      
2002 01  08.31481  06 56 24.22   +24 00 05.8   22.6R 01XZ255   568  Cf2430      
2002 01  08.33928  06 56 23.87   +24 00 06.4   22.8R 01XZ255   568  Cf2430      
2002 02  15.48741  06 49 19.32   +24 09 11.7         01XZ255   568  Cf2430      
2002 02  15.51343  06 49 19.08   +24 09 12.5         01XZ255   568  Cf2430      
2002 10  31.54044  07 32 05.64   +23 05 42.4   23.0R 01XZ255   568  Cg5849      
2002 11  01.55572  07 32 04.64   +23 05 51.7   23.1R 01XZ255   568  Cg5849      
2003 03  03.24506  07 13 00.99   +23 48 51.9         01XZ255   568  Ch6100      
2003 03  03.26162  07 13 00.89   +23 48 52.2         01XZ255   568  Ch6100      
2015 01  25.573472 11 51 05.95   +03 54 16.4         01XZ255   T09  C~8r3J      
2015 01  25.630699 11 51 05.64   +03 54 18.8         01XZ255   T09  C~8r3J      
2017 01  28.59808  12 30 53.54   -00 31 22.8   22.6z 01XZ255   T09  C~8PvK      
2017 01  28.61691  12 30 53.46   -00 31 22.1   22.6z 01XZ255   T09  C~8PvK      
2017 01  28.64799  12 30 53.35   -00 31 21.3   22.5z 01XZ255   T09  C~8PvK      
2017 01  28.65069  12 30 53.34   -00 31 21.1   22.5z 01XZ255   T09  C~8PvL      
2025 05  27.25600  15 02 02.840  -15 46 57.67  22.8G 01XZ255   G37              
2025 05  27.31397  15 02 02.209  -15 46 54.61        01XZ255   G37              

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     0.02       0.00     0.09
     2   0.0001      0.00     0.21       0.00    -0.09
     3   0.0001      0.00     0.10       0.00    -0.18
     4   0.0216      0.00    -0.05       0.00     0.10
     5   0.0217      0.00    -0.08       0.00    -0.06
     6   0.0761      0.00    -0.15       0.00    -0.10
     7   0.0761      0.00    -0.53       0.00     0.01
     8   0.1806      0.00     0.49       0.00    -0.39
     9   0.1806      0.00     0.03       0.00     0.23
    10   0.8871      0.00     0.05       0.00     0.01
    11   0.8899      0.00     0.13       0.00    -0.20
    12   1.2230      0.00    -0.15       0.00     0.23
    13   1.2231      0.00    -0.21       0.00     0.41
    14  13.1226      0.00     0.02       0.00    -0.11
    15  13.1228      0.00    -0.05       0.00    -0.10
    16  15.1323      0.00     0.02       0.00     0.03
    17  15.1323      0.00    -0.10       0.00     0.13
    18  15.1324      0.00     0.03       0.00    -0.06
    19  15.1324      0.00     0.03       0.00     0.06
    20  23.4571      0.00 (   2.84)      0.00 (  -1.57)
    21  23.4573      0.00 (   2.94)      0.00 (  -0.91)

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.

01XZ255    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        16.004    16.004    16.004
ecceobj         0.037     0.037     0.037
incobj          2.607     2.607     2.607
qmin           13.323    11.928    12.142
qmax           18.448    18.839    19.513
amean          15.923    15.651    15.869
amin           15.667    14.983    15.672
amax           16.985    16.154    16.070
emean           0.098     0.121     0.142
emin            0.034     0.034     0.034
emax            0.152     0.223     0.230
imean           1.602     1.396     1.583
imin            0.197     0.219     1.180
imax            2.042     2.131     2.042
excite_mean     0.102     0.124     0.145
fracstop        0.010     0.016     0.019
cjmean          3.337     3.354     3.332

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       245.9     253.1     199.2
kozaiamp        176.0     179.8     178.5