Orbit Fit and Astrometric record for 98KY61

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: 98KY61    
# Created Thu Oct 19 01:36:58 2017
# Orbit generated from Bernstein formalism
# Fitting   54 observations of   56
# Arc:  16.89y
# First observation: 1998/05/20
#  Last observation: 2015/04/09
Preliminary a, adot, b, bdot, g, gdot:
  -0.000097   0.020008   0.000001  -0.000716   0.021879   0.000000
# Chi-squared of fit:    52.03 DOF:  102 RMS:  0.17
# Min/Max residuals:    -0.56    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.356120E-05  1.959187E-02 -2.167820E-06 -7.026396E-04  2.175333E-02  3.392352E-04
# Covariance matrix:
  3.6962E-14 -4.6445E-15 -2.8029E-17  1.0447E-16  3.3720E-14 -1.0478E-14
 -4.6445E-15  2.5630E-14  3.2429E-16 -8.5204E-16  5.4332E-14  7.4887E-14
 -2.8029E-17  3.2429E-16  3.1779E-14 -2.5146E-15  7.2689E-16  9.9647E-16
  1.0447E-16 -8.5204E-16 -2.5146E-15  1.2979E-15 -1.6724E-15 -2.6421E-15
  3.3720E-14  5.4332E-14  7.2689E-16 -1.6724E-15  4.1759E-13  1.3701E-13
 -1.0478E-14  7.4887E-14  9.9647E-16 -2.6421E-15  1.3701E-13  2.3323E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.026791  -55.201539    0.927446   -0.000394   -0.410490  2450953.830171
# Heliocentric elements and errors
Epoch:              2450950.5000  =  1998/05/17
Mean Anomaly:          187.54643 +/-     0.047
Argument of Peri:      353.77029 +/-     0.038
Long of Asc Node:      122.91562 +/-     0.000
Inclination:             2.05104 +/-     0.000
Eccentricity:         0.04058409 +/-    0.0001
Semi-Major Axis:     44.60070096 +/-    0.0046
Time of Perihelion: 2503067.6487 +/-      11.8
Perihelion:          42.79062204 +/-    0.0056
Aphelion:            46.41077988 +/-    0.0059
Period (y)              297.8659 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           25.71614380 +/-    0.0008
Ecliptic Y          -38.61724892 +/-    0.0011
Ecliptic Z           -0.02160338 +/-    0.0000
Ecliptic XDOT         0.00205087 +/-    0.0000
Ecliptic YDOT         0.00138104 +/-    0.0000
Ecliptic ZDOT        -0.00008853 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.39625451 +/-    0.0010
Geocenter to KBO     45.96996358 +/-    0.0014
# Hcoef:  7.30

The following table shows the complete astrometric record for 98KY61. 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 (98KY61) followed by the observatory code and reference code for the source of the astrometry.

1998 05  20.32944  20 28 36.04   -19 05 27.6   24.6R 98KY61    807  Ca1784      
1998 05  20.33653  20 28 36.02   -19 05 28.0   23.4R 98KY61    807  Ca1784      
1998 05  20.34340  20 28 36.02   -19 05 27.9   23.2R 98KY61    807  Ca1784      
1998 05  20.35028  20 28 36.01   -19 05 28.0   24.4R 98KY61    807  Ca1784      
1998 05  20.35801  20 28 36.00   -19 05 27.9   23.9R 98KY61    807  Ca1784      
1998 05  20.36495  20 28 35.99   -19 05 28.0   23.7R 98KY61    807  Ca1784      
1998 05  20.37190  20 28 35.98   -19 05 28.0   23.5R 98KY61    807  Ca1784      
1998 05  20.37882  20 28 35.97   -19 05 28.2   23.5R 98KY61    807  Ca1784      
1998 05  20.38569  20 28 35.97   -19 05 28.1   23.4R 98KY61    807  Ca1784      
1998 05  20.39264  20 28 35.95   -19 05 28.2   23.5R 98KY61    807  Ca1784      
1998 05  20.39951  20 28 35.94   -19 05 28.2   24.1R 98KY61    807  Ca1784      
1998 05  20.41333  20 28 35.93   -19 05 28.3   23.2R 98KY61    807  Ca1784      
1998 05  20.42020  20 28 35.92   -19 05 28.4   23.3R 98KY61    807  Ca1784      
1998 05  20.42707  20 28 35.91   -19 05 28.3   24.3R 98KY61    807  Ca1784      
1998 05  20.43394  20 28 35.90   -19 05 28.4   23.6R 98KY61    807  Ca1784      
1998 05  29.33005  20 28 20.81   -19 06 25.4   23.3R 98KY61    807  Ca1784      
1998 05  29.33693  20 28 20.81   -19 06 25.3   24.0R 98KY61    807  Ca1784      
1998 05  29.34380  20 28 20.79   -19 06 25.5   23.5R 98KY61    807  Ca1784      
1998 05  29.35067  20 28 20.77   -19 06 25.5   24.0R 98KY61    807  Ca1784      
1998 05  29.35755  20 28 20.76   -19 06 25.6   24.1R 98KY61    807  Ca1784      
1998 05  29.36443  20 28 20.75   -19 06 25.6   24.0R 98KY61    807  Ca1784      
1998 05  29.37131  20 28 20.74   -19 06 25.7   23.6R 98KY61    807  Ca1784      
1998 05  29.37818  20 28 20.72   -19 06 25.9   23.8R 98KY61    807  Ca1784      
1998 05  29.38506  20 28 20.70   -19 06 25.9   23.8R 98KY61    807  Ca1784      
1998 05  29.39193  20 28 20.68   -19 06 25.9   24.2R 98KY61    807  Ca1784      
1998 05  29.39881  20 28 20.68   -19 06 26.0   23.6R 98KY61    807  Ca1784      
1998 05  29.40568  20 28 20.66   -19 06 25.9   23.9R 98KY61    807  Ca1784      
1998 05  30.31126  20 28 18.78   -19 06 32.9   23.6R 98KY61    807  Ca1784      
1998 05  30.31814  20 28 18.77   -19 06 32.9   23.4R 98KY61    807  Ca1784      
1998 05  30.32501  20 28 18.76   -19 06 33.0   23.6R 98KY61    807  Ca1784      
1998 05  30.33189  20 28 18.74   -19 06 33.0   23.7R 98KY61    807  Ca1784      
1998 05  30.33876  20 28 18.72   -19 06 33.1   23.7R 98KY61    807  Ca1784      
1998 05  30.34564  20 28 18.71   -19 06 33.1   23.8R 98KY61    807  Ca1784      
1998 05  30.35267  20 28 18.69   -19 06 33.2   23.4R 98KY61    807  Ca1784      
1998 05  30.35954  20 28 18.66   -19 06 33.2   23.7R 98KY61    807  Ca1784      
1998 05  30.36642  20 28 18.65   -19 06 33.3   23.6R 98KY61    807  Ca1784      
1998 05  30.37329  20 28 18.62   -19 06 33.4   23.5R 98KY61    807  Ca1784      
1998 05  30.38032  20 28 18.62   -19 06 33.6   23.7R 98KY61    807  Ca1784      
1998 05  30.38719  20 28 18.60   -19 06 33.5   23.7R 98KY61    807  Ca1784      
1998 06  30.45556  20 26 41.43   -19 12 25.9         98KY61    568  Ca1784      
1998 06  30.48295  20 26 41.31   -19 12 26.2         98KY61    568  Ca1784      
1998 07  01.44990  20 26 37.48   -19 12 40.0         98KY61    568  Ca1784      
2000 07  29.08958  20 34 01.30   -18 51 40.4   22.9R 98KY61    807  Ch1065      
2000 07  29.19720  20 34 00.82   -18 51 42.0         98KY61    807  Ch1065      
2001 06  26.46844  20 40 59.55   -18 28 06.2         98KY61    568  Cd2199      
2001 06  26.49992  20 40 59.43   -18 28 06.2         98KY61    568  Cd2199      
2001 06  27.41677  20 40 56.13   -18 28 19.2         98KY61    568  Cd2199      
2005 06  14.420775 21 00 05.59   -17 21 45.4         98KY61    645  C~1cF1      
2005 06  14.421604 21 00 05.59   -17 21 45.4         98KY61    645  C~1cF1      
2005 06  14.424092 21 00 05.58   -17 21 45.5         98KY61    645  C~1cF1      
2013 10  06.11748  21 29 45.48   -15 28 50.8   24.1R 98KY61    695  C~0zdB      
2013 10  07.14082  21 29 42.64   -15 28 55.2         98KY61    695  C~0zdB      
2013 10  07.22721  21 29 42.45   -15 28 55.5         98KY61    695  C~0zdB      
2015 04  09.386319 21 44 16.798  -14 19 28.36  23.4R 98KY61    309  C~1PqX      
2015 04  09.395995 21 44 16.827  -14 19 28.42  23.6R 98KY61    309  C~1PqX      
2015 04  09.406968 21 44 16.880  -14 19 27.95  23.8R 98KY61    309  C~1PqX      

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     0.14       0.00     0.34
  2   0.0000     -0.37    -0.09      -0.32     0.02
  3   0.0000     -0.35     0.08      -0.22     0.12
  4   0.0001     -0.51     0.06      -0.29     0.06
  5   0.0001     -0.62     0.10      -0.16     0.19
  6   0.0001     -0.78     0.08      -0.22     0.13
  7   0.0001     -0.92     0.09      -0.18     0.17
  8   0.0001     -1.11     0.05      -0.34     0.01
  9   0.0002     -1.08     0.21      -0.25     0.11
 10   0.0002     -1.38     0.06      -0.28     0.08
 11   0.0002     -1.52     0.06      -0.24     0.12
 12   0.0002     -1.68     0.18      -0.30     0.06
 13   0.0002     -1.84     0.16      -0.37    -0.01
 14   0.0003     -1.96     0.19      -0.24     0.13
 15   0.0003     -2.12     0.17      -0.30     0.06
 16   0.0246   -223.44    -0.17      -4.29    -0.08
 17   0.0247   -223.41     0.07      -4.19     0.02
 18   0.0247   -223.74    -0.04      -4.32    -0.10
 19   0.0247   -224.01    -0.10      -4.25    -0.03
 20   0.0247   -224.17    -0.05      -4.31    -0.10
 21   0.0247   -224.31     0.02      -4.28    -0.06
 22   0.0248   -224.47     0.08      -4.34    -0.12
 23   0.0248   -224.80    -0.03      -4.47    -0.25
 24   0.0248   -225.07    -0.10      -4.40    -0.18
 25   0.0248   -225.35    -0.16      -4.33    -0.11
 26   0.0248   -225.37     0.03      -4.43    -0.21
 27   0.0248   -225.62    -0.01      -4.27    -0.04
 28   0.0273   -253.17    -0.02      -4.67    -0.04
 29   0.0273   -253.31     0.07      -4.64     0.00
 30   0.0274   -253.47     0.13      -4.70    -0.06
 31   0.0274   -253.74     0.07      -4.63     0.01
 32   0.0274   -254.04    -0.01      -4.66    -0.02
 33   0.0274   -254.18     0.08      -4.63     0.02
 34   0.0274   -254.48     0.00      -4.66    -0.01
 35   0.0275   -254.89    -0.19      -4.55     0.09
 36   0.0275   -255.05    -0.13      -4.62     0.03
 37   0.0275   -255.49    -0.35      -4.61     0.04
 38   0.0275   -255.54    -0.17      -4.81    -0.16
 39   0.0275   -255.79    -0.20      -4.64     0.01
 40   0.1126  -1676.97     0.11     -18.22    -0.17
 41   0.1127  -1678.69     0.00     -18.11    -0.05
 42   0.1153  -1734.67     0.19     -18.63    -0.16
 43   2.1924   4676.94    -0.09    -323.42     0.05
 44   2.1927   4669.94     0.10    -323.28     0.21
 45   3.1024  10794.25    -0.56    -455.55    -0.01
 46   3.1025  10792.60    -0.50    -455.11     0.44
 47   3.1050  10743.75    -0.24    -455.60     0.42
 48   7.0694  27774.56     0.21   -1037.33    -0.45
 49   7.0694  27774.56     0.24   -1037.33    -0.45
 50   7.0694  27774.39     0.17   -1037.38    -0.50
 51  15.3807  55343.52 (   6.07)  -2296.13 (  -8.59)
 52  15.3835  55300.27     0.18   -2286.93     0.16
 53  15.3837  55297.37 (   0.47)  -2286.32 (   0.70)
 54  16.8872  69870.38    -0.06   -2488.70     0.14
 55  16.8872  69870.80    -0.23   -2488.91    -0.05
 56  16.8873  69871.78     0.10   -2488.72     0.16

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.

98KY61    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.381    44.395    44.367
ecceobj         0.046     0.046     0.046
incobj          2.053     2.053     2.053
qmin           41.285    41.288    41.259
qmax           47.716    47.719    47.711
amean          44.388    44.401    44.374
amin           44.039    44.054    44.032
amax           44.762    44.771    44.733
emean           0.051     0.051     0.052
emin            0.036     0.036     0.036
emax            0.067     0.066     0.067
imean           1.137     1.135     1.140
imin            0.513     0.515     0.511
imax            1.717     1.713     1.722
excite_mean     0.055     0.055     0.056
fracstop        1.000     1.000     1.000
cjmean          3.103     3.103     3.102

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       197.9     197.5     198.5
kozaiamp        180.0     180.0     179.9