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 Sun Oct 22 01:37:16 2017
# Orbit generated from Bernstein formalism
# Fitting   13 observations of   13
# Arc:   1.22y
# First observation: 2001/12/11
#  Last observation: 2003/03/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000402   0.100618   0.000004   0.004100   0.064327   0.000000
# Chi-squared of fit:    14.86 DOF:   20 RMS:  0.19
# Min/Max residuals:    -0.51    0.43
# Exact a, adot, b, bdot, g, gdot:
  2.453957E-05  1.033574E-01  2.556325E-07  4.219271E-03  6.613375E-02  6.258391E-03
# Covariance matrix:
  3.1907E-13  1.1656E-12 -4.3787E-15  7.3442E-14  7.2113E-13  1.5710E-11
  1.1656E-12  1.6264E-11 -5.1725E-14  8.6305E-13  7.5215E-12  1.8678E-10
 -4.3787E-15 -5.1725E-14  1.8197E-13 -1.9037E-13 -2.4477E-14 -6.1507E-13
  7.3442E-14  8.6305E-13 -1.9037E-13  5.7453E-13  4.0977E-13  1.0256E-11
  7.2113E-13  7.5215E-12 -2.4477E-14  4.0977E-13  3.8595E-12  8.8025E-11
  1.5710E-11  1.8678E-10 -6.1507E-13  1.0256E-11  8.8025E-11  2.2227E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.164922  104.210840    0.408107    0.018011   -0.889573  2452255.037583
# Heliocentric elements and errors
Epoch:              2452250.5000  =  2001/12/07
Mean Anomaly:           87.18701 +/-     0.101
Argument of Peri:      293.66432 +/-     0.062
Long of Asc Node:       77.81847 +/-     0.004
Inclination:             2.60761 +/-     0.000
Eccentricity:         0.03511609 +/-    0.0005
Semi-Major Axis:     16.02790798 +/-    0.0007
Time of Perihelion: 2446574.2311 +/-       6.6
Perihelion:          15.46507056 +/-    0.0073
Aphelion:            16.59074539 +/-    0.0073
Period (y)               64.1687 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -3.53272163 +/-    0.0001
Ecliptic Y           15.62334593 +/-    0.0004
Ecliptic Z            0.30740761 +/-    0.0000
Ecliptic XDOT        -0.00421923 +/-    0.0000
Ecliptic YDOT        -0.00080281 +/-    0.0000
Ecliptic ZDOT         0.00018011 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   16.02072282 +/-    0.0004
Geocenter to KBO     15.12087334 +/-    0.0004
# Hcoef: 11.13

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      

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     0.16
  2   0.0001     -3.58     0.23      -0.08    -0.01
  3   0.0001     -7.44     0.14      -0.09    -0.10
  4   0.0216  -1304.11    -0.04      32.15     0.15
  5   0.0217  -1309.35    -0.05      32.11    -0.01
  6   0.0761  -4853.73    -0.16      90.57    -0.06
  7   0.0761  -4858.56    -0.51      90.71     0.01
  8   0.1806 -10706.89     0.43     109.54    -0.32
  9   0.1806 -10710.24    -0.05     110.06     0.26
 10   0.8871  24883.76    -0.03     614.02    -0.07
 11   0.8899  24868.44     0.07     621.07    -0.28
 12   1.2230   8811.05     0.02     939.30     0.05
 13   1.2231   8809.64    -0.06     939.43     0.21

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        16.003    16.005    16.001
ecceobj         0.037     0.038     0.036
incobj          2.607     2.607     2.607
qmin           12.468    12.638    13.294
qmax           18.827    18.747    18.316
amean          15.863    15.863    15.865
amin           15.618    15.461    15.670
amax           16.018    16.169    16.083
emean           0.109     0.106     0.098
emin            0.034     0.035     0.033
emax            0.202     0.185     0.159
imean           1.663     1.662     1.707
imin            1.376     1.222     1.403
imax            2.040     2.053     2.030
excite_mean     0.113     0.110     0.103
fracstop        0.011     0.011     0.010
cjmean          3.339     3.340     3.341

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       245.3     244.5     233.4
kozaiamp        175.2     175.8     174.0