Orbit Fit and Astrometric record for 98WX24

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: 98WX24    
# Created Sun Oct 22 01:36:58 2017
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   29
# Arc:  10.09y
# First observation: 1998/11/18
#  Last observation: 2008/12/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000278   0.021025  -0.000004   0.000336   0.022275   0.000000
# Chi-squared of fit:    57.80 DOF:   48 RMS:  0.26
# Min/Max residuals:    -0.61    0.63
# Exact a, adot, b, bdot, g, gdot:
  1.195609E-05  2.075929E-02  8.943692E-07  3.314212E-04  2.265889E-02  3.650408E-05
# Covariance matrix:
  1.4218E-13 -7.6299E-14  8.1739E-16 -1.0473E-15  2.1797E-14 -3.0559E-13
 -7.6299E-14  9.8039E-14 -1.2018E-15  1.5530E-15 -6.7718E-14  4.5324E-13
  8.1739E-16 -1.2018E-15  9.6654E-14 -1.2282E-14  8.2655E-16 -5.7613E-15
 -1.0473E-15  1.5530E-15 -1.2282E-14  3.5569E-15 -1.1688E-15  7.4512E-15
  2.1797E-14 -6.7718E-14  8.2655E-16 -1.1688E-15  3.1844E-13 -3.4178E-13
 -3.0559E-13  4.5324E-13 -5.7613E-15  7.4512E-15 -3.4178E-13  2.1747E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.116028   53.666591   -0.044767   -0.002218   -0.983454  2451135.885631
# Heliocentric elements and errors
Epoch:              2451130.5000  =  1998/11/13
Mean Anomaly:          171.15689 +/-     0.125
Argument of Peri:      181.12626 +/-     0.121
Long of Asc Node:       60.80210 +/-     0.001
Inclination:             0.91929 +/-     0.000
Eccentricity:         0.03628122 +/-    0.0001
Semi-Major Axis:     43.55776515 +/-    0.0047
Time of Perihelion: 2506210.6939 +/-      35.5
Perihelion:          41.97743618 +/-    0.0057
Aphelion:            45.13809411 +/-    0.0060
Period (y)              287.4793 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.70245034 +/-    0.0007
Ecliptic Y           36.37094668 +/-    0.0009
Ecliptic Z           -0.08932648 +/-    0.0000
Ecliptic XDOT        -0.00201860 +/-    0.0000
Ecliptic YDOT         0.00149886 +/-    0.0000
Ecliptic ZDOT         0.00004001 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.12066706 +/-    0.0008
Geocenter to KBO     44.13278825 +/-    0.0011
# Hcoef:  6.57

The following table shows the complete astrometric record for 98WX24. 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 (98WX24) followed by the observatory code and reference code for the source of the astrometry.

1998 11  18.38490  03 25 15.39   +18 34 38.3   22.5R 98WX24    695  Ca3208      
1998 11  18.45898  03 25 14.98   +18 34 37.1         98WX24    695  Ca3208      
1998 11  26.33705  03 24 37.99   +18 32 23.6   22.8R 98WX24    695  Ca3208      
1998 11  27.34580  03 24 33.32   +18 32 06.7         98WX24    695  Ca3208      
1998 12  18.07999  03 23 04.16   +18 26 43.3         98WX24    950  Ca3608      
1998 12  18.12219  03 23 04.03   +18 26 42.6         98WX24    950  Ca3608      
1998 12  18.16236  03 23 03.87   +18 26 42.2         98WX24    950  Ca3608      
1999 01  22.33679  03 21 31.54   +18 21 10.7   22.8R 98WX24    568  Ca5544      
1999 01  23.37498  03 21 30.35   +18 21 07.4         98WX24    568  Ca5544      
1999 10  07.42896  03 33 08.14   +19 03 46.2         98WX24    568  Ca7322      
1999 10  07.48706  03 33 07.94   +19 03 45.5         98WX24    568  Ca7322      
1999 10  07.62051  03 33 07.47   +19 03 43.9         98WX24    568  Ca7322      
1999 10  09.58354  03 33 00.86   +19 03 21.1   23.0R 98WX24    568  Ca6740      
1999 10  09.61509  03 33 00.70   +19 03 20.6   22.8R 98WX24    568  Ca6740      
1999 10  10.51748  03 32 57.52   +19 03 09.6   22.7R 98WX24    568  Ca6740      
1999 10  10.58385  03 32 57.32   +19 03 09.0   22.9R 98WX24    568  Ca6740      
2000 11  28.28747  03 34 11.04   +19 08 43.0   22.8R 98WX24    695  Cc3588      
2000 11  29.23117  03 34 06.63   +19 08 28.1   22.9R 98WX24    695  Cc3588      
2000 11  29.29959  03 34 06.31   +19 08 26.8   22.8R 98WX24    695  Cc3588      
2003 10  22.33777  03 51 48.18   +20 09 18.2   21.7R 98WX24    304  Ci9217      
2003 10  22.34662  03 51 48.13   +20 09 18.0         98WX24    304  Ci9217      
2003 10  23.27302  03 51 44.36   +20 09 07.1   22.8R 98WX24    304  Ci9217      
2003 10  23.30439  03 51 44.24   +20 09 06.7         98WX24    304  Ci9217      
2008 11  17.19471  04 14 37.62   +21 18 32.9   24.0R 98WX24    250  S~06AK      
2008 11  17.20166  04 14 37.59   +21 18 32.8         98WX24    250  S~06AK      
2008 11  17.20791  04 14 37.56   +21 18 32.7         98WX24    250  S~06AK      
2008 11  17.21485  04 14 37.52   +21 18 32.7         98WX24    250  S~06AK      
2008 12  22.27277  04 11 50.31   +21 11 34.2   22.6r 98WX24    695  C~0hkJ      
2008 12  22.36040  04 11 49.93   +21 11 33.1   22.8r 98WX24    695  C~0hkJ      

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     0.52       0.00    -0.14
  2   0.0002     -5.94    -0.22       0.29     0.14
  3   0.0218   -548.62     0.51       2.00     0.23
  4   0.0245   -617.15     0.63       2.20     0.22
  5   0.0813  -1926.14    -0.61       6.93    -0.22
  6   0.0814  -1928.10    -0.16       6.72    -0.43
  7   0.0815  -1930.41    -0.18       6.91    -0.25
  8   0.1778  -3285.90     0.15      18.11     0.16
  9   0.1807  -3303.13 (   0.42)     19.22 (   0.93)
 10   0.8844   6938.25    -0.35      62.49     0.05
 11   0.8846   6935.33    -0.38      62.48     0.02
 12   0.8850   6928.47    -0.56      62.51     0.00
 13   0.8903   6831.91 (   0.85)     62.67 (  -0.04)
 14   0.8904   6829.59     0.16      62.72     0.00
 15   0.8929   6783.13    -0.14      62.77    -0.02
 16   0.8931   6780.23     0.47      62.86     0.05
 17   2.0285   7875.95    -0.03     139.45     0.13
 18   2.0311   7811.62    -0.09     139.75     0.24
 19   2.0313   7806.90    -0.08     139.56     0.02
 20   4.9253  23338.76     0.57     339.35    -0.22
 21   4.9253  23338.02     0.36     339.30    -0.26
 22   4.9278  23283.14    -0.29     339.86     0.14
 23   4.9279  23281.38    -0.16     339.83     0.10
 24   9.9981  43520.21     0.01     694.86     0.05
 25   9.9981  43519.76     0.06     694.83     0.02
 26   9.9981  43519.32     0.05     694.81    -0.00
 27   9.9982  43518.74    -0.02     694.91     0.10
 28  10.0941  41044.16    -0.14     700.28     0.00
 29  10.0944  41038.52    -0.08     700.16    -0.13

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.

98WX24    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.652    43.666    43.638
ecceobj         0.034     0.034     0.034
incobj          0.921     0.921     0.921
qmin           40.985    41.002    40.978
qmax           45.943    45.920    45.942
amean          43.369    43.383    43.356
amin           43.036    43.058    43.020
amax           43.711    43.720    43.699
emean           0.033     0.033     0.033
emin            0.015     0.015     0.015
emax            0.052     0.051     0.052
imean           1.264     1.259     1.270
imin            0.311     0.313     0.308
imax            1.925     1.917     1.932
excite_mean     0.041     0.041     0.041
fracstop        1.000     1.000     1.000
cjmean          3.092     3.092     3.092

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       161.7     162.0     161.9
kozaiamp        179.8     180.0     179.9