Orbit Fit and Astrometric record for 01XU254

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: 01XU254   
# Created Mon Dec 18 02:37:09 2017
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:  13.19y
# First observation: 2001/12/09
#  Last observation: 2015/02/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000476   0.023976  -0.000143   0.002704   0.025336   0.000000
# Chi-squared of fit:    66.77 DOF:   44 RMS:  0.29
# Min/Max residuals:    -0.80    0.50
# Exact a, adot, b, bdot, g, gdot:
  1.759552E-05  2.299894E-02 -3.718998E-07  2.595979E-03  2.390268E-02 -1.507370E-03
# Covariance matrix:
  1.7322E-13 -1.9632E-14  1.9901E-15 -2.2002E-15  1.1178E-13 -6.5518E-14
 -1.9632E-14  4.2889E-14 -4.5017E-15  4.5280E-15  6.3856E-14  1.3138E-13
  1.9901E-15 -4.5017E-15  1.0613E-13 -1.1091E-14 -5.1889E-15 -1.5115E-14
 -2.2002E-15  4.5280E-15 -1.1091E-14  2.8269E-15  4.8378E-15  1.5313E-14
  1.1178E-13  6.3856E-14 -5.1889E-15  4.8378E-15  3.4271E-13  1.3714E-13
 -6.5518E-14  1.3138E-13 -1.5115E-14  1.5313E-14  1.3714E-13  4.4523E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.005850  106.707016    0.479710   -0.015061   -0.853410  2452252.885873
# Heliocentric elements and errors
Epoch:              2452250.5000  =  2001/12/07
Mean Anomaly:          292.42438 +/-     0.038
Argument of Peri:       67.47572 +/-     0.046
Long of Asc Node:      114.75039 +/-     0.000
Inclination:             6.49554 +/-     0.000
Eccentricity:         0.07893403 +/-    0.0000
Semi-Major Axis:     43.77272563 +/-    0.0041
Time of Perihelion: 2472106.4797 +/-      10.8
Perihelion:          40.31756817 +/-    0.0041
Aphelion:            47.22788309 +/-    0.0047
Period (y)              289.6100 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -11.81004453 +/-    0.0003
Ecliptic Y           41.02491456 +/-    0.0010
Ecliptic Z           -0.73444000 +/-    0.0000
Ecliptic XDOT        -0.00248360 +/-    0.0000
Ecliptic YDOT        -0.00091769 +/-    0.0000
Ecliptic ZDOT         0.00030054 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.69730868 +/-    0.0009
Geocenter to KBO     41.83631145 +/-    0.0010
# Hcoef:  6.66

The following table shows the complete astrometric record for 01XU254. 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 (01XU254) followed by the observatory code and reference code for the source of the astrometry.

2001 12  09.38513  07 11 55.57   +21 23 47.7         01XU254   568  Ce7056      
2001 12  09.41419  07 11 55.45   +21 23 47.6         01XU254   568  Ce7056      
2001 12  09.45138  07 11 55.29   +21 23 48.1         01XU254   568  Ce7056      
2002 01  09.50295  07 09 20.96   +21 28 45.2         01XU254   568  Ce7056      
2002 01  09.52848  07 09 20.83   +21 28 45.4         01XU254   568  Ce7056      
2002 01  09.55405  07 09 20.69   +21 28 45.8   22.4R 01XU254   568  Ce7056      
2002 02  03.44805  07 07 18.08   +21 32 53.5   22.7R 01XU254   568  Cf2430      
2002 02  04.44306  07 07 13.70   +21 33 02.9         01XU254   568  Cf2430      
2002 02  05.45629  07 07 09.27   +21 33 12.1         01XU254   568  Cf2430      
2002 10  31.53102  07 19 32.15   +21 18 39.5   22.4R 01XU254   568  Cg5849      
2002 11  01.54547  07 19 30.92   +21 18 42.2   22.7R 01XU254   568  Cg5849      
2003 05  01.25703  07 11 41.29   +21 38 09.7   21.3R 01XU254   568  Ci0016      
2005 01  08.34144  07 26 41.84   +21 23 35.7   22.6r 01XU254   568  C~0D2Y      
2005 01  08.37932  07 26 41.63   +21 23 36.3   23.4r 01XU254   568  C~0D2Y      
2005 01  08.41709  07 26 41.44   +21 23 36.8   23.6r 01XU254   568  C~0D2Y      
2006 02  25.16324  07 28 48.88   +21 29 45.8   22.5R 01XU254   688  Cq5973      
2006 02  25.26905  07 28 48.51   +21 29 46.6         01XU254   688  Cq5973      
2009 02  26.15156  07 46 01.88   +21 17 39.2   23.6R 01XU254   688  C~04pJ      
2009 02  26.25003  07 46 01.49   +21 17 40.1         01XU254   688  C~04pJ      
2013 03  13.16304  08 08 28.28   +20 53 19.8   22.5R 01XU254   695  C~0ucs      
2013 03  14.14592  08 08 25.62   +20 53 28.8         01XU254   695  C~0ucs      
2013 03  14.23631  08 08 25.35   +20 53 29.5         01XU254   695  C~0ucs      
2015 02  18.15977  08 21 40.06   +20 30 10.2   22.1R 01XU254   695  C~1M62      
2015 02  18.20668  08 21 39.85   +20 30 11.0         01XU254   695  C~1M62      
2015 02  18.25255  08 21 39.64   +20 30 11.8         01XU254   695  C~1M62      

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    -0.49       0.00     0.43
  2   0.0001     -1.65    -0.30      -0.31     0.10
  3   0.0002     -3.93    -0.22      -0.08     0.29
  4   0.0852  -2178.91    -0.15      34.60     0.04
  5   0.0853  -2180.73    -0.08      34.58    -0.01
  6   0.0853  -2182.72    -0.17      34.75     0.13
  7   0.1535  -3911.36     0.07      80.38    -0.22
  8   0.1562  -3973.16     0.38      82.66    -0.08
  9   0.1590  -4035.64     0.39      84.68    -0.27
 10   0.8929   6367.09     0.50     516.21     0.31
 11   0.8957   6349.68     0.43     516.56     0.38
 12   1.3905   -303.48    -0.08     831.06     0.27
 13   3.0827  12281.57     0.04    1654.63    -0.80
 14   3.0828  12278.57    -0.12    1654.79    -0.69
 15   3.0829  12275.87     0.02    1654.90    -0.64
 16   4.2129  13988.23    -0.03    2284.69     0.31
 17   4.2132  13982.98    -0.10    2284.71     0.14
 18   7.2163  28501.31     0.01    3940.60     0.11
 19   7.2166  28495.68    -0.41    3940.51    -0.09
 20  11.2574  47936.23     0.07    6243.91    -0.01
 21  11.2601  47895.81     0.45    6244.74     0.24
 22  11.2604  47891.76     0.19    6244.61     0.09
 23  13.1931  59852.82    -0.19    7429.00    -0.07
 24  13.1932  59849.51    -0.11    7429.09    -0.00
 25  13.1933  59846.20    -0.09    7429.17     0.07

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.

01XU254    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.586    43.598    43.574
ecceobj         0.076     0.076     0.076
incobj          6.508     6.508     6.508
qmin           39.443    39.463    39.414
qmax           47.755    47.804    47.787
amean          43.491    43.503    43.480
amin           43.144    43.156    43.134
amax           43.849    43.872    43.850
emean           0.072     0.072     0.072
emin            0.054     0.055     0.054
emax            0.090     0.090     0.090
imean           4.996     4.994     4.997
imin            4.183     4.182     4.179
imax            5.809     5.810     5.818
excite_mean     0.113     0.113     0.113
fracstop        1.000     1.000     1.000
cjmean          3.080     3.080     3.080

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       182.3     182.2     182.4
kozaiamp        180.0     180.0     180.0