Orbit Fit and Astrometric record for 04KV18

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: 04KV18    
# Created Tue Dec 12 02:37:24 2017
# Orbit generated from Bernstein formalism
# Fitting   22 observations of   22
# Arc:  12.01y
# First observation: 2004/05/24
#  Last observation: 2016/05/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000916   0.049224  -0.000341   0.011842   0.039518   0.000000
# Chi-squared of fit:    13.98 DOF:   38 RMS:  0.14
# Min/Max residuals:    -0.32    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.985628E-05  4.838377E-02  5.371798E-06  1.161313E-02  3.898492E-02  6.778485E-03
# Covariance matrix:
  1.9206E-13 -1.3982E-13  1.9362E-14 -3.0930E-14  9.1201E-14 -2.1151E-13
 -1.3982E-13  2.1893E-13 -3.2855E-14  5.1660E-14  3.7405E-14  3.5269E-13
  1.9362E-14 -3.2855E-14  9.2900E-14 -1.8542E-14 -8.0986E-15 -5.4339E-14
 -3.0930E-14  5.1660E-14 -1.8542E-14  1.8019E-14  1.0606E-14  8.5402E-14
  9.1201E-14  3.7405E-14 -8.0986E-15  1.0606E-14  5.0572E-13  7.0865E-14
 -2.1151E-13  3.5269E-13 -5.4339E-14  8.5402E-14  7.0865E-14  5.8302E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.393470 -130.499878   -0.248520   -0.023824   -0.981519  2453149.860913
# Heliocentric elements and errors
Epoch:              2453140.5000  =  2004/05/15
Mean Anomaly:           41.61147 +/-     0.010
Argument of Peri:      295.41044 +/-     0.014
Long of Asc Node:      235.59076 +/-     0.000
Inclination:            13.58015 +/-     0.000
Eccentricity:         0.18914463 +/-    0.0000
Semi-Major Axis:     30.32429779 +/-    0.0027
Time of Perihelion: 2446090.4033 +/-       1.5
Perihelion:          24.58861961 +/-    0.0025
Aphelion:            36.05997597 +/-    0.0034
Period (y)              166.9915 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -17.10618292 +/-    0.0003
Ecliptic Y          -20.40583602 +/-    0.0004
Ecliptic Z           -0.62361854 +/-    0.0000
Ecliptic XDOT         0.00225917 +/-    0.0000
Ecliptic YDOT        -0.00259070 +/-    0.0000
Ecliptic ZDOT         0.00080388 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   26.63472429 +/-    0.0003
Geocenter to KBO     25.65094196 +/-    0.0005
# Hcoef:  9.00

The following table shows the complete astrometric record for 04KV18. 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 (04KV18) followed by the observatory code and reference code for the source of the astrometry.

2004 05  24.36017  15 06 36.12   -18 56 49.5   23.5g 04KV18    568  C~07Xq      
2004 05  24.38333  15 06 35.95   -18 56 48.6   23.8g 04KV18    568  C~07Xq      
2004 05  24.40770  15 06 35.77   -18 56 47.8   23.8g 04KV18    568  C~07Xq      
2004 05  25.36907  15 06 29.05   -18 56 13.5   23.9g 04KV18    568  C~07Xq      
2004 06  10.28202  15 04 45.65   -18 47 05.7   22.5i 04KV18    568  C~0X5W      
2004 06  10.29034  15 04 45.60   -18 47 05.5   22.8i 04KV18    568  C~0X5W      
2004 06  10.35397  15 04 45.21   -18 47 03.3   22.9i 04KV18    568  C~0X5W      
2004 06  10.42113  15 04 44.80   -18 47 01.2   22.8i 04KV18    568  C~0X5W      
2005 05  14.39021  15 19 49.14   -19 08 12.8         04KV18    568  C~0X5W      
2005 05  14.42394  15 19 48.89   -19 08 11.6   22.9R 04KV18    568  C~0X5W      
2005 05  14.46270  15 19 48.61   -19 08 10.4   22.6R 04KV18    568  C~0X5W      
2005 07  12.02961  15 14 16.60   -18 39 47.2   22.6R 04KV18    809  C~0X5W      
2005 07  12.07765  15 14 16.46   -18 39 46.5   22.7R 04KV18    809  C~0X5W      
2005 07  12.12861  15 14 16.32   -18 39 45.4   22.8R 04KV18    809  C~0X5W      
2005 07  13.07431  15 14 13.81   -18 39 28.2   22.8R 04KV18    809  C~0X5W      
2005 08  02.01982  15 13 49.84   -18 35 17.7         04KV18    309  C~0X5W      
2005 08  02.11937  15 13 49.87   -18 35 17.0         04KV18    309  C~0X5W      
2005 08  03.11032  15 13 50.19   -18 35 10.5         04KV18    309  C~0X5W      
2006 05  02.37141  15 33 07.62   -19 17 02.3   21.9r 04KV18    695  C~0X5W      
2006 05  02.44260  15 33 07.12   -19 16 59.9   22.2r 04KV18    695  C~0X5W      
2016 05  29.36303  17 17 46.632  -17 17 09.23  22.5R 04KV18    G37              
2016 05  29.42410  17 17 46.212  -17 17 08.18        04KV18    G37              

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    -0.05       0.00    -0.14
  2   0.0001     -2.57    -0.12       0.21    -0.08
  3   0.0001     -5.24    -0.18       0.28    -0.18
  4   0.0028   -106.33    -0.17       7.23    -0.32
  5   0.0463  -1668.07     0.24     131.15     0.05
  6   0.0464  -1668.81     0.26     131.15    -0.01
  7   0.0465  -1674.74     0.17     131.74     0.10
  8   0.0467  -1680.91     0.15     132.15    -0.01
  9   0.9720  11036.46    -0.15    2312.70     0.22
 10   0.9721  11032.72    -0.14    2312.96     0.28
 11   0.9722  11028.56     0.02    2313.11     0.19
 12   1.1326   6027.59    -0.01    2737.66     0.13
 13   1.1327   6025.48     0.01    2737.82    -0.06
 14   1.1328   6023.27     0.04    2738.35     0.09
 15   1.1354   5984.30     0.07    2745.57     0.09
 16   1.1900   5589.36    -0.23    2897.63    -0.14
 17   1.1903   5589.58    -0.01    2898.41    -0.10
 18   1.1930   5592.26    -0.09    2905.89    -0.16
 19   1.9384  22207.73     0.05    4594.82    -0.05
 20   1.9386  22200.19     0.15    4595.48     0.16
 21  12.0137 121270.92    -0.03   29314.91    -0.11
 22  12.0139 121262.69     0.04   29315.20     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.

04KV18    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        30.034    30.042    30.026
ecceobj         0.182     0.183     0.182
incobj         13.618    13.618    13.618
qmin           22.996    21.998    23.771
qmax           38.425    37.720    37.257
amean          30.239    30.120    30.122
amin           29.464    29.312    29.476
amax           31.017    31.050    30.942
emean           0.202     0.159     0.186
emin            0.177     0.036     0.163
emax            0.240     0.254     0.205
imean          14.278    14.018    14.724
imin           13.315    10.091    14.222
imax           15.050    16.640    15.562
excite_mean     0.319     0.293     0.315
fracstop        0.060     0.401     0.025
cjmean          2.902     2.914     2.905

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       180.0     180.6     143.3
kozaiamp        179.9     179.9     178.1