Orbit Fit and Astrometric record for 99KR18

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: 99KR18    
# Created Tue Oct 17 01:37:02 2017
# Orbit generated from Bernstein formalism
# Fitting   19 observations of   21
# Arc:   2.52y
# First observation: 1999/05/11
#  Last observation: 2001/11/15
Preliminary a, adot, b, bdot, g, gdot:
  -0.000002   0.014989   0.000002   0.000141   0.019405   0.000000
# Chi-squared of fit:    16.26 DOF:   32 RMS:  0.16
# Min/Max residuals:    -0.47    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.127603E-05  1.476057E-02  1.480729E-06  1.410387E-04  1.911216E-02  8.635316E-04
# Covariance matrix:
  2.5923E-13  8.2970E-14 -9.0415E-16  2.0591E-15  2.7519E-13  5.5179E-12
  8.2970E-14  4.7816E-13 -2.3449E-15  8.0018E-15  5.6078E-13  2.1816E-11
 -9.0415E-16 -2.3449E-15  1.6327E-13 -8.2456E-14 -3.1836E-15 -1.3601E-13
  2.0591E-15  8.0018E-15 -8.2456E-14  7.8142E-14  9.2490E-15  5.9400E-13
  2.7519E-13  5.6078E-13 -3.1836E-15  9.2490E-15  8.5414E-13  2.5065E-11
  5.5179E-12  2.1816E-11 -1.3601E-13  5.9400E-13  2.5065E-11  1.6316E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.248247  -50.834274    0.997942    0.000607   -0.189691  2451309.863153
# Heliocentric elements and errors
Epoch:              2451300.5000  =  1999/05/02
Mean Anomaly:          168.17795 +/-     0.597
Argument of Peri:      212.08807 +/-     0.608
Long of Asc Node:      283.96827 +/-     0.043
Inclination:             0.60538 +/-     0.001
Eccentricity:         0.20436355 +/-    0.0002
Semi-Major Axis:     43.72142766 +/-    0.0074
Time of Perihelion: 2507565.1921 +/-     174.8
Perihelion:          34.78636142 +/-    0.0123
Aphelion:            52.65649390 +/-    0.0140
Period (y)              289.1011 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.39953650 +/-    0.0016
Ecliptic Y          -41.34268745 +/-    0.0020
Ecliptic Z            0.22677145 +/-    0.0000
Ecliptic XDOT         0.00171478 +/-    0.0000
Ecliptic YDOT         0.00124828 +/-    0.0000
Ecliptic ZDOT         0.00002077 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   52.52617630 +/-    0.0018
Geocenter to KBO     52.32270600 +/-    0.0025
# Hcoef:  7.91

The following table shows the complete astrometric record for 99KR18. 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 (99KR18) followed by the observatory code and reference code for the source of the astrometry.

1999 05  11.36241  20 46 07.53   -17 43 25.4   24.6R 99KR18    807  Ca6743      
1999 05  18.31687  20 46 03.91   -17 43 36.4   25.0R 99KR18    807  Ca6743      
1999 05  18.39397  20 46 03.87   -17 43 37.1   24.7R 99KR18    807  Ca6743      
1999 05  19.31240  20 46 03.12   -17 43 39.3   24.8R 99KR18    807  Ca6743      
1999 05  19.38827  20 46 03.03   -17 43 39.6   24.4R 99KR18    807  Ca6743      
1999 08  08.38579  20 42 00.01   -17 58 58.7   25.1R 99KR18    568  Ca6743      
1999 08  08.43446  20 41 59.82   -17 58 59.7   25.5R 99KR18    568  Ca6743      
1999 08  08.43968  20 41 59.79   -17 58 59.7   25.1R 99KR18    568  Ca6743      
1999 08  08.44484  20 41 59.77   -17 59 00.0   24.9R 99KR18    568  Ca6743      
2000 07  28.15275  20 46 10.60   -17 42 20.9   24.3R 99KR18    309  Ce1692      
2000 07  28.15829  20 46 10.58   -17 42 20.9   24.4R 99KR18    309  Ce1692      
2000 07  28.16385  20 46 10.55   -17 42 21.1   24.2R 99KR18    309  Ce1692      
2000 07  29.05402  20 46 07.01   -17 42 34.3         99KR18    309  Ce1692      
2000 07  29.05958  20 46 06.98   -17 42 34.5         99KR18    309  Ce1692      
2000 07  29.06537  20 46 06.96   -17 42 35.0   25. R 99KR18    309  Ce1692      
2001 07  26.47918  20 49 45.63   -17 27 42.1         99KR18    568  Ce1692      
2001 08  13.02713  20 48 35.81   -17 32 17.6         99KR18    807  Ce1692      
2001 08  13.06199  20 48 35.70   -17 32 18.1         99KR18    807  Ce1692      
2001 11  14.03099  20 46 01.52   -17 42 40.2   24.4R 99KR18    309  Ce1692      
2001 11  14.07814  20 46 01.60   -17 42 39.5   24.8R 99KR18    309  Ce1692      
2001 11  15.04998  20 46 03.20   -17 42 33.6   25.4R 99KR18    309  Ce1692      

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     0.19       0.00    -0.28
  2   0.0190    -52.79    -0.10       3.03     0.22
  3   0.0193    -53.53     0.11       2.50    -0.34
  4   0.0218    -64.44     0.16       3.21     0.04
  5   0.0220    -65.76    -0.14       3.26     0.05
  6   0.2437  -3655.48     0.04      21.75     0.24
  7   0.2439  -3658.36     0.07      21.48    -0.04
  8   0.2439  -3658.77    -0.03      21.59     0.07
  9   0.2439  -3659.12    -0.08      21.38    -0.15
 10   1.2150     59.33    -0.13      50.64     0.07
 11   1.2150     59.05    -0.08      50.72     0.15
 12   1.2151     58.58    -0.21      50.64     0.07
 13   1.2175      6.31 (   0.19)     51.25 (   0.59)
 14   1.2175      5.84 (   0.05)     51.17 (   0.51)
 15   1.2175      5.44    -0.01      50.76     0.10
 16   2.2098   3257.33    -0.03      79.61    -0.47
 17   2.2578   2221.02    -0.17      81.47     0.18
 18   2.2579   2219.37     0.23      81.41     0.12
 19   2.5124    -70.92    -0.01      66.24    -0.23
 20   2.5126    -69.63     0.18      66.62     0.14
 21   2.5152    -46.02     0.01      66.28     0.03

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.

99KR18    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE

axisobj        43.639    43.662    43.619
ecceobj         0.207     0.207     0.206
incobj          0.608     0.608     0.608
qmin           34.001    33.982    34.028
qmax           53.993    53.979    53.979
amean          43.727    43.727    43.727
amin           43.293    43.292    43.269
amax           44.242    44.234    44.234
emean           0.178     0.173     0.188
emin            0.104     0.093     0.138
emax            0.221     0.221     0.221
imean           6.205     6.498     5.514
imin            2.180     2.180     2.180
imax           10.902    10.803     9.556
excite_mean     0.213     0.212     0.214
fracstop        1.000     1.000     1.000
cjmean          3.043     3.044     3.043

libcent 0       183.1     172.0     176.6
libamp  0       118.0     118.8     101.9
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       260.8     242.1     266.0
kozaiamp         70.3      64.9      60.3