Orbit Fit and Astrometric record for 98WG24

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: 98WG24    
# Created Tue Oct 24 01:36:58 2017
# Orbit generated from Bernstein formalism
# Fitting   37 observations of   37
# Arc:  18.35y
# First observation: 1998/11/18
#  Last observation: 2017/03/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.002172   0.026958  -0.000103   0.001025   0.025630   0.000000
# Chi-squared of fit:    51.94 DOF:   68 RMS:  0.21
# Min/Max residuals:    -0.57    0.49
# Exact a, adot, b, bdot, g, gdot:
  1.569899E-05  2.522131E-02  1.299960E-06  9.576547E-04  2.475607E-02 -1.980722E-03
# Covariance matrix:
  1.5117E-13 -3.4487E-14  1.4701E-15 -1.0911E-15  9.1364E-14 -6.9676E-14
 -3.4487E-14  1.8582E-14 -9.3690E-16  6.6718E-16 -7.1272E-15  4.1774E-14
  1.4701E-15 -9.3690E-16  6.3340E-14 -6.3023E-15  2.2822E-16 -2.3010E-15
 -1.0911E-15  6.6718E-16 -6.3023E-15  1.6047E-15 -2.4825E-16  1.6389E-15
  9.1364E-14 -7.1272E-15  2.2822E-16 -2.4825E-16  1.5710E-13 -1.8177E-14
 -6.9676E-14  4.1774E-14 -2.3010E-15  1.6389E-15 -1.8177E-14  1.0263E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.495222   76.259188    0.335703   -0.008225   -0.925422  2451135.932941
# Heliocentric elements and errors
Epoch:              2451130.5000  =  1998/11/13
Mean Anomaly:          324.00527 +/-     0.014
Argument of Peri:       33.17368 +/-     0.018
Long of Asc Node:       88.34231 +/-     0.000
Inclination:             2.22482 +/-     0.000
Eccentricity:         0.12713455 +/-    0.0000
Semi-Major Axis:     45.72775635 +/-    0.0035
Time of Perihelion: 2462423.3787 +/-       4.3
Perihelion:          39.91417852 +/-    0.0035
Aphelion:            51.54133418 +/-    0.0043
Period (y)              309.2275 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           10.14815168 +/-    0.0002
Ecliptic Y           40.05527790 +/-    0.0006
Ecliptic Z           -0.34907384 +/-    0.0000
Ecliptic XDOT        -0.00276188 +/-    0.0000
Ecliptic YDOT         0.00045976 +/-    0.0000
Ecliptic ZDOT         0.00010777 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.32229571 +/-    0.0006
Geocenter to KBO     40.39412683 +/-    0.0006
# Hcoef:  6.55

The following table shows the complete astrometric record for 98WG24. 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 (98WG24) followed by the observatory code and reference code for the source of the astrometry.

1998 11  18.43221  05 00 31.48   +22 14 15.4   22.1R 98WG24    695  Ca3208      
1998 11  18.50365  05 00 31.12   +22 14 15.0         98WG24    695  Ca3208      
1998 11  19.39534  05 00 26.67   +22 14 08.7   22.4R 98WG24    695  Ca3208      
1998 11  19.50699  05 00 26.10   +22 14 08.0         98WG24    695  Ca3208      
1999 01  22.29072  04 55 16.53   +22 07 13.1   22.8R 98WG24    568  Ca5544      
1999 01  22.34875  04 55 16.33   +22 07 12.8         98WG24    568  Ca5544      
1999 01  23.33334  04 55 13.05   +22 07 08.7         98WG24    568  Ca5544      
1999 11  30.32365  05 05 44.82   +22 24 46.3   22.7R 98WG24    695  Ca9916      
1999 11  30.33074  05 05 44.79   +22 24 46.4   22.5R 98WG24    695  Ca9916      
1999 12  28.22900  05 03 16.68   +22 21 46.3   22.4R 98WG24    695  Ca9916      
1999 12  28.23622  05 03 16.69   +22 21 46.2   22.5R 98WG24    695  Ca9916      
1999 12  28.32757  05 03 16.15   +22 21 45.1         98WG24    695  Ca9916      
1999 12  29.29841  05 03 11.30   +22 21 39.9   22.6R 98WG24    695  Ca9916      
1999 12  29.30588  05 03 11.27   +22 21 39.8   22.8R 98WG24    695  Ca9916      
1999 12  29.36427  05 03 10.96   +22 21 39.7   22.3R 98WG24    695  Ca9916      
1999 12  29.37226  05 03 10.95   +22 21 39.6   22.3R 98WG24    695  Ca9916      
2000 01  05.14468  05 02 38.14   +22 21 00.3   23.0R 98WG24    697  Ca9916      
2000 01  05.22955  05 02 37.75   +22 20 59.6   23.0R 98WG24    697  Ca9916      
2000 01  05.30292  05 02 37.39   +22 20 59.4   23.1R 98WG24    697  Ca9916      
2000 11  23.45178  05 12 33.15   +22 36 22.4   22.8R 98WG24    695  Cc2190      
2000 11  23.50455  05 12 32.87   +22 36 21.8         98WG24    695  Cc2190      
2000 11  26.35848  05 12 18.14   +22 36 06.3   22.8R 98WG24    695  Cc2190      
2000 11  26.45245  05 12 17.63   +22 36 05.7   22.9R 98WG24    695  Cc2190      
2000 11  27.41353  05 12 12.62   +22 36 00.5   22.5R 98WG24    695  Cc2190      
2002 01  30.08895  05 13 27.56   +22 41 32.8   20.5  98WG24    304  Cf1458      
2002 01  30.11159  05 13 27.50   +22 41 32.7         98WG24    304  Cf1458      
2002 02  13.04581  05 12 53.77   +22 41 08.5   21.5R 98WG24    304   f1458      
2002 02  13.09976  05 12 53.67   +22 41 08.5         98WG24    304   f1458      
2005 11  16.98956  05 44 59.11   +23 17 40.0   22.0R 98WG24    250  S~06AK      
2005 11  16.99628  05 44 59.08   +23 17 40.0         98WG24    250  S~06AK      
2005 11  17.00299  05 44 59.05   +23 17 40.0         98WG24    250  S~06AK      
2008 12  21.40374  06 01 28.62   +23 31 05.2   21.4r 98WG24    695  C~0hkJ      
2008 12  21.47708  06 01 28.21   +23 31 05.3   22.1r 98WG24    695  C~0hkJ      
2008 12  22.38747  06 01 23.16   +23 31 06.0   21.8r 98WG24    695  C~0hkJ      
2013 11  06.43622  06 37 54.56   +23 30 54.6   23.2R 98WG24    G37  C~0yiW      
2013 11  06.51738  06 37 54.33   +23 30 54.9         98WG24    G37  C~0yiW      
2017 03  24.24519  06 48 47.455  +23 31 02.94        98WG24    568  C           

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     0.08       0.00    -0.14
  2   0.0002     -5.01     0.10       0.11    -0.04
  3   0.0026    -67.12     0.07       0.16    -0.26
  4   0.0029    -75.06     0.04       0.27    -0.17
  5   0.1776  -4395.45     0.16      45.48    -0.00
  6   0.1777  -4398.25     0.16      45.49    -0.06
  7   0.1804  -4444.02    -0.02      46.47    -0.14
  8   1.0319   4389.29    -0.08     202.80     0.09
  9   1.0319   4388.89     0.05     202.94     0.23
 10   1.1083   2326.32    -0.17     219.82    -0.00
 11   1.1083   2326.45     0.48     219.71    -0.12
 12   1.1085   2318.88    -0.57     219.35    -0.56
 13   1.1112   2251.41    -0.22     220.74     0.07
 14   1.1112   2250.99    -0.11     220.68     0.00
 15   1.1114   2246.70    -0.28     221.00     0.29
 16   1.1114   2246.55     0.14     220.92     0.19
 17   1.1299   1789.68     0.12     226.48     0.20
 18   1.1302   1784.23     0.28     226.31    -0.06
 19   1.1304   1779.24     0.15     226.61     0.17
 20   2.0151  10094.25    -0.12     399.62     0.06
 21   2.0153  10090.33    -0.24     399.34    -0.23
 22   2.0231   9885.29    -0.10     400.69    -0.09
 23   2.0233   9878.18    -0.28     400.67    -0.14
 24   2.0260   9808.45    -0.09     401.22    -0.01
 25   3.1996  10872.24    -0.11     648.08    -0.13
 26   3.1997  10871.40     0.05     648.05    -0.18
 27   3.2378  10402.94     0.04     661.75     0.08
 28   3.2380  10401.55     0.02     661.86     0.14
 29   6.9967  37461.21     0.33    1417.16     0.47
 30   6.9968  37460.78     0.33    1417.17     0.48
 31   6.9968  37460.35     0.34    1417.18     0.49
 32  10.0916  51733.84    -0.22    2077.02    -0.10
 33  10.0918  51727.84    -0.19    2077.11    -0.03
 34  10.0943  51654.02    -0.15    2077.62    -0.05
 35  14.9678  85129.32    -0.05    3189.44    -0.10
 36  14.9681  85125.60    -0.02    3189.53    -0.08
 37  18.3458  95810.86     0.09    3966.35    -0.23

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.

98WG24    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.908    45.919    45.898
ecceobj         0.130     0.131     0.130
incobj          2.224     2.224     2.224
qmin           38.848    38.863    38.825
qmax           52.736    52.736    52.734
amean          45.638    45.648    45.629
amin           45.260    45.276    45.249
amax           46.067    46.076    46.059
emean           0.131     0.131     0.131
emin            0.117     0.117     0.117
emax            0.146     0.145     0.146
imean           0.760     0.759     0.761
imin            0.020     0.028     0.020
imax            1.312     1.313     1.313
excite_mean     0.132     0.132     0.132
fracstop        1.000     1.000     1.000
cjmean          3.100     3.100     3.100

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       176.8     176.4     177.0
kozaiamp        179.9     179.9     180.0