Orbit Fit and Astrometric record for 98WY24

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: 98WY24    
# Created Tue Oct 24 01:36:58 2017
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:  13.10y
# First observation: 1998/11/18
#  Last observation: 2011/12/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000461   0.024916  -0.000034   0.000742   0.025534   0.000000
# Chi-squared of fit:    24.57 DOF:   52 RMS:  0.16
# Min/Max residuals:    -0.40    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.442339E-05  2.408602E-02 -3.467761E-07  7.181638E-04  2.442900E-02 -4.232216E-04
# Covariance matrix:
  1.5089E-13 -3.3150E-14  6.3069E-16 -8.0804E-16  1.0162E-13 -8.8412E-14
 -3.3150E-14  5.0204E-14 -1.4338E-15  1.4401E-15  4.8131E-14  1.5700E-13
  6.3069E-16 -1.4338E-15  7.6564E-14 -9.3754E-15 -1.6684E-15 -4.7856E-15
 -8.0804E-16  1.4401E-15 -9.3754E-15  3.3431E-15  1.3223E-15  4.8310E-15
  1.0162E-13  4.8131E-14 -1.6684E-15  1.3223E-15  3.0457E-13  1.4352E-13
 -8.8412E-14  1.5700E-13 -4.7856E-15  4.8310E-15  1.4352E-13  5.2673E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.890176   76.000717    0.331435   -0.014628   -0.926879  2451135.938351
# Heliocentric elements and errors
Epoch:              2451130.5000  =  1998/11/13
Mean Anomaly:          328.01501 +/-     0.054
Argument of Peri:        7.46312 +/-     0.058
Long of Asc Node:      102.61655 +/-     0.002
Inclination:             1.91146 +/-     0.000
Eccentricity:         0.04085809 +/-    0.0001
Semi-Major Axis:     43.34564442 +/-    0.0038
Time of Perihelion: 2460391.5526 +/-      15.5
Perihelion:          41.57462427 +/-    0.0045
Aphelion:            45.11666458 +/-    0.0047
Period (y)              285.3819 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           10.45501909 +/-    0.0002
Ecliptic Y           40.53306740 +/-    0.0009
Ecliptic Z           -0.63596850 +/-    0.0000
Ecliptic XDOT        -0.00263100 +/-    0.0000
Ecliptic YDOT         0.00061732 +/-    0.0000
Ecliptic ZDOT         0.00008119 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.86456058 +/-    0.0009
Geocenter to KBO     40.93494720 +/-    0.0009
# Hcoef:  6.58

The following table shows the complete astrometric record for 98WY24. 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 (98WY24) followed by the observatory code and reference code for the source of the astrometry.

1998 11  18.43762  04 59 35.44   +21 49 05.4   22.6R 98WY24    695  Ca3208      
1998 11  18.50897  04 59 35.07   +21 49 04.7         98WY24    695  Ca3208      
1998 11  19.49641  04 59 30.18   +21 48 57.5   22.5R 98WY24    695   a3608      
1998 11  19.53615  04 59 29.97   +21 48 57.4         98WY24    695   a3608      
1998 11  26.37301  04 58 55.18   +21 48 06.5   22.7R 98WY24    695  Ca3208      
1998 11  27.37204  04 58 50.01   +21 47 59.2         98WY24    695  Ca3208      
1998 12  19.01745  04 56 55.74   +21 45 18.4   22.7R 98WY24    950   a3608      
1998 12  19.10795  04 56 55.29   +21 45 17.3         98WY24    950   a3608      
1998 12  19.15789  04 56 55.04   +21 45 16.8         98WY24    950   a3608      
1999 01  22.30591  04 54 23.97   +21 41 59.6   22.9R 98WY24    568  Ca5544      
1999 01  22.35924  04 54 23.79   +21 41 59.7         98WY24    568  Ca5545      
1999 01  23.34528  04 54 20.55   +21 41 55.8         98WY24    568  Ca5545      
2000 11  23.44734  05 10 59.69   +22 09 06.5   22.8R 98WY24    695  Cc3588      
2000 11  23.49502  05 10 59.45   +22 09 06.2         98WY24    695  Cc3588      
2000 11  27.35230  05 10 39.68   +22 08 43.3   23.1R 98WY24    695  Cc3588      
2000 11  27.42891  05 10 39.28   +22 08 42.9   23.1R 98WY24    695  Cc3588      
2000 11  28.39859  05 10 34.24   +22 08 37.0   22.8R 98WY24    695  Cc3588      
2000 11  29.37068  05 10 29.17   +22 08 31.1   23.1R 98WY24    695  Cc3588      
2000 11  29.43688  05 10 28.81   +22 08 30.8   23.1R 98WY24    695  Cc3588      
2001 01  25.16590  05 05 58.55   +22 03 39.7   22.7R 98WY24    695  Cc6418      
2001 01  25.24633  05 05 58.30   +22 03 39.6         98WY24    695  Cc6418      
2002 01  30.08376  05 11 38.65   +22 13 15.2   21.2  98WY24    304  Cf1458      
2002 01  30.10590  05 11 38.57   +22 13 15.2         98WY24    304  Cf1458      
2002 02  14.02889  05 11 03.99   +22 12 55.1   21.3R 98WY24    304   f1458      
2002 02  14.08993  05 11 03.89   +22 12 55.0         98WY24    304   f1458      
2008 12  22.36861  05 56 31.91   +22 59 01.2   21.8r 98WY24    695  C~0hkJ      
2008 12  22.45199  05 56 31.45   +22 59 01.1   21.8r 98WY24    695  C~0hkJ      
2011 12  24.39708  06 14 38.60   +23 04 50.5   22.7R 98WY24    688  C~0bcS      
2011 12  24.44397  06 14 38.36   +23 04 50.6         98WY24    688  C~0bcS      

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     0.24       0.00     0.17
  2   0.0002     -5.20     0.04      -0.16     0.02
  3   0.0029    -73.67     0.10      -0.26    -0.04
  4   0.0030    -76.59    -0.02      -0.06     0.17
  5   0.0217   -563.76    -0.24      -0.16    -0.32
  6   0.0245   -636.13     0.03       0.12    -0.18
  7   0.0837  -2236.01    -0.40       9.61     0.31
  8   0.0840  -2242.37    -0.07       9.19    -0.17
  9   0.0841  -2245.88     0.08       9.07    -0.31
 10   0.1776  -4360.42     0.04      44.58    -0.34
 11   0.1777  -4362.90     0.10      44.96    -0.03
 12   0.1804  -4408.23    -0.05      46.15    -0.20
 13   2.0151   9595.04     0.05     297.44     0.03
 14   2.0152   9591.68     0.11     297.43     0.02
 15   2.0258   9315.48     0.01     298.05     0.05
 16   2.0260   9309.90     0.05     298.13     0.12
 17   2.0286   9239.49    -0.01     298.25     0.04
 18   2.0313   9168.66     0.00     298.42    -0.01
 19   2.0315   9163.64    -0.11     298.55     0.11
 20   2.1868   5391.86    -0.17     345.17     0.25
 21   2.1870   5388.39     0.13     345.39     0.36
 22   3.1996  10156.56     0.18     499.75     0.20
 23   3.1996  10155.45     0.02     499.84     0.26
 24   3.2405   9674.17    -0.01     520.38    -0.05
 25   3.2407   9672.77     0.02     520.40    -0.12
 26  10.0943  48382.69    -0.12    1528.78    -0.17
 27  10.0945  48375.99    -0.15    1528.73    -0.25
 28  13.0978  64510.15    -0.06    2013.47     0.05
 29  13.0979  64506.51     0.21    2013.49     0.06

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.

98WY24    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.496    43.507    43.484
ecceobj         0.044     0.044     0.044
incobj          1.911     1.911     1.911
qmin           40.169    40.179    40.188
qmax           46.555    46.532    46.476
amean          43.252    43.263    43.240
amin           42.917    42.920    42.906
amax           43.605    43.619    43.589
emean           0.049     0.049     0.049
emin            0.030     0.030     0.030
emax            0.068     0.068     0.067
imean           1.024     1.020     1.028
imin            0.127     0.128     0.128
imax            1.605     1.598     1.611
excite_mean     0.053     0.053     0.052
fracstop        1.000     1.000     1.000
cjmean          3.089     3.089     3.089

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       179.2     178.9     179.4
kozaiamp        180.0     179.9     179.9