Orbit Fit and Astrometric record for 17KZ31

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: 17KZ31    
# Created Thu Jul 19 01:38:25 2018
# Orbit generated from Bernstein formalism
# Fitting   62 observations of   64
# Arc:   2.01y
# First observation: 2016/04/11
#  Last observation: 2018/04/16
Preliminary a, adot, b, bdot, g, gdot:
   0.010176  -0.267428  -0.001108   0.030990   0.102457   0.000000
# Chi-squared of fit:   189.77 DOF:  118 RMS:  0.31
# Min/Max residuals:    -1.74    0.84
# Exact a, adot, b, bdot, g, gdot:
 -3.936734E-05 -2.492540E-01  4.325766E-06  2.960105E-02  9.928593E-02 -2.143752E-02
# Covariance matrix:
  2.2371E-13 -3.1668E-13 -1.2194E-14  2.7367E-14  6.0384E-14  3.9574E-13
 -3.1668E-13  7.0976E-13  3.2855E-14 -8.1703E-14 -6.1568E-14 -1.1544E-12
 -1.2194E-14  3.2855E-14  1.2334E-13 -9.1759E-14 -3.7874E-15 -5.9594E-14
  2.7367E-14 -8.1703E-14 -9.1759E-14  8.7811E-14  3.5253E-15  1.5164E-13
  6.0384E-14 -6.1568E-14 -3.7874E-15  3.5253E-15  8.1921E-14  6.7910E-14
  3.9574E-13 -1.1544E-12 -5.9594E-14  1.5164E-13  6.7910E-14  2.1320E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
  -18.506354 -147.703016    0.183801   -0.311255   -0.930294  2457489.909369
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          359.38742 +/-     0.000
Argument of Peri:      300.85033 +/-     0.001
Long of Asc Node:      144.82663 +/-     0.000
Inclination:           161.69157 +/-     0.000
Eccentricity:         0.79372099 +/-    0.0000
Semi-Major Axis:     53.13247799 +/-    0.0042
Time of Perihelion: 2457721.2117 +/-       0.0
Perihelion:          10.96011504 +/-    0.0012
Aphelion:            95.30484094 +/-    0.0075
Period (y)              387.3007 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -9.00485125 +/-    0.0000
Ecliptic Y           -5.47378298 +/-    0.0000
Ecliptic Z           -3.19684766 +/-    0.0000
Ecliptic XDOT        -0.00341741 +/-    0.0000
Ecliptic YDOT         0.00596402 +/-    0.0000
Ecliptic ZDOT         0.00096169 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   11.01224232 +/-    0.0000
Geocenter to KBO     10.07192067 +/-    0.0000
# Hcoef: 10.43

The following table shows the complete astrometric record for 17KZ31. 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 (17KZ31) followed by the observatory code and reference code for the source of the astrometry.

2016 04  11.40858  13 31 36.138  -29 31 20.39  20.4w 17KZ31    F51  C~2Rk0      
2016 04  11.41893  13 31 35.778  -29 31 18.47  20.4w 17KZ31    F51  C~2Rk0      
2016 04  11.42927  13 31 35.419  -29 31 16.57  20.5w 17KZ31    F51  C~2Rk0      
2016 04  11.43964  13 31 35.067  -29 31 14.67  20.5w 17KZ31    F51  C~2Rk0      
2016 05  15.31762  13 13 09.385  -27 27 37.63  20.2i 17KZ31    F51  C~2Rk0      
2016 05  15.32729  13 13 09.092  -27 27 35.28  20.5i 17KZ31    F51  C~2Rk0      
2016 05  15.33703  13 13 08.822  -27 27 32.86  20.4i 17KZ31    F51  C~2Rk0      
2016 05  15.34716  13 13 08.526  -27 27 30.66  20.3i 17KZ31    F51  C~2Rk0      
2017 02  10.52558  13 06 10.090  -24 14 49.97  20.3i 17KZ31    F51  C~2GJi      
2017 02  10.53524  13 06 09.850  -24 14 49.55  20.6i 17KZ31    F51  C~2GJi      
2017 02  10.54490  13 06 09.635  -24 14 48.99  20.7i 17KZ31    F51  C~2GJi      
2017 02  10.55456  13 06 09.446  -24 14 48.37  20.5i 17KZ31    F51  C~2GJi      
2017 04  15.40210  12 35 18.057  -21 27 54.03  20.3i 17KZ31    F51  C~2GJi      
2017 04  15.40468  12 35 17.968  -21 27 53.49  20.6i 17KZ31    F51  C~2GJi      
2017 04  15.41345  12 35 17.696  -21 27 51.39  20.4i 17KZ31    F51  C~2GJi      
2017 04  15.41604  12 35 17.619  -21 27 50.75  20.4i 17KZ31    F51  C~2GJi      
2017 04  15.42478  12 35 17.337  -21 27 48.67  20.6i 17KZ31    F51  C~2GJi      
2017 04  15.42736  12 35 17.253  -21 27 48.10  20.5i 17KZ31    F51  C~2GJi      
2017 05  02.22351  12 27 07.92   -20 18 56.6   20.2V 17KZ31    G96  C~2GJi      
2017 05  02.22777  12 27 07.80   -20 18 54.9   20.6V 17KZ31    G96  C~2GJi      
2017 05  02.23204  12 27 07.69   -20 18 54.1   21.3V 17KZ31    G96  C~2GJi      
2017 05  02.23631  12 27 07.55   -20 18 53.0   20.6V 17KZ31    G96  C~2GJi      
2017 05  27.26450  12 17 33.263  -18 37 18.57  20.8w 17KZ31    F51  C~2GJi      
2017 05  27.27553  12 17 33.059  -18 37 16.12  20.7w 17KZ31    F51  C~2GJi      
2017 05  27.28653  12 17 32.858  -18 37 13.52  20.7w 17KZ31    F51  C~2GJi      
2017 05  27.29755  12 17 32.644  -18 37 11.09  20.7w 17KZ31    F51  C~2GJi      
2017 05  27.96826  12 17 20.41   -18 34 36.6   20.5V 17KZ31    807  C~2GJi      
2017 05  27.97204  12 17 20.34   -18 34 35.6   20.4V 17KZ31    807  C~2GJi      
2017 05  27.97582  12 17 20.27   -18 34 34.7   20.9V 17KZ31    807  C~2GJi      
2017 05  28.146714 12 17 17.16   -18 33 56.8   20.6G 17KZ31    H01  C~2GJi      
2017 05  28.154442 12 17 17.03   -18 33 54.9   20.5G 17KZ31    H01  C~2GJi      
2017 05  28.163504 12 17 16.82   -18 33 52.0   20.5G 17KZ31    W86  C~2GJi      
2017 05  28.164838 12 17 16.83   -18 33 52.7   20.8G 17KZ31    H01  C~2GJi      
2017 05  28.167436 12 17 16.75   -18 33 51.1   20.7G 17KZ31    W86  C~2GJi      
2017 05  28.169408 12 17 16.75   -18 33 51.6   20.6G 17KZ31    H01  C~2GJi      
2017 05  28.171370 12 17 16.66   -18 33 50.2   20.6G 17KZ31    W86  C~2GJi      
2017 05  28.175306 12 17 16.61   -18 33 49.4   20.7G 17KZ31    W86  C~2GJi      
2017 05  28.18747  12 17 16.38   -18 33 47.8   20.5R 17KZ31    926  C~2GJi      
2017 05  28.19528  12 17 16.20   -18 33 46.9   21.2R 17KZ31    926  C~2GJi      
2017 05  28.20207  12 17 16.13   -18 33 44.0   20.7R 17KZ31    926  C~2GJi      
2017 05  28.274237 12 17 14.865  -18 33 27.55  20.7G 17KZ31    568  C~2GJi      
2017 05  28.275223 12 17 14.848  -18 33 27.31  20.7G 17KZ31    568  C~2GJi      
2017 05  28.276205 12 17 14.829  -18 33 27.08  20.8G 17KZ31    568  C~2GJi      
2017 05  29.18138  12 16 58.67   -18 30 01.4   20.4V 17KZ31    I52  C~2GJi      
2017 05  29.18489  12 16 58.66   -18 30 01.1   21.0R 17KZ31    926  C~2GJi      
2017 05  29.19084  12 16 58.45   -18 29 58.9   20.1V 17KZ31    I52  C~2GJi      
2017 05  29.19363  12 16 58.47   -18 29 59.0   21.6R 17KZ31    926  C~2GJi      
2017 05  29.20016  12 16 58.38   -18 29 57.9   21.4V 17KZ31    I52  C~2GJi      
2017 05  29.20233  12 16 58.29   -18 29 57.2   22.1R 17KZ31    926  C~2GJi      
2017 05  29.46416  12 16 53.64   -18 28 56.5         17KZ31    Q62  C~2GJi      
2017 05  29.46672  12 16 53.60   -18 28 55.9         17KZ31    Q62  C~2GJi      
2017 05  29.46927  12 16 53.55   -18 28 55.3   20.2w 17KZ31    Q62  C~2GJi      
2018 02  11.55211  12 17 14.218  -16 19 51.99  20.7w 17KZ31    F51  C~2Y58      
2018 02  11.56394  12 17 13.921  -16 19 50.67  20.7w 17KZ31    F51  C~2Y58      
2018 02  11.57579  12 17 13.641  -16 19 49.23  20.9w 17KZ31    F51  C~2Y58      
2018 02  11.58762  12 17 13.364  -16 19 47.77  20.7w 17KZ31    F51  C~2Y58      
2018 03  22.28385  11 59 23.65   -14 27 17.5   20.8G 17KZ31    G96  C~2b0l      
2018 03  22.28900  11 59 23.50   -14 27 16.7   20.6G 17KZ31    G96  C~2b0l      
2018 03  22.29414  11 59 23.37   -14 27 15.8   20.4G 17KZ31    G96  C~2b0l      
2018 03  22.29929  11 59 23.19   -14 27 13.5   20.6G 17KZ31    G96  C~2b0l      
2018 04  16.27660  11 47 36.19   -12 49 38.6   20.2G 17KZ31    G96  C~2bsK      
2018 04  16.28176  11 47 36.06   -12 49 36.5   20.5G 17KZ31    G96  C~2bsK      
2018 04  16.28692  11 47 35.94   -12 49 35.5   20.8G 17KZ31    G96  C~2bsK      
2018 04  16.29208  11 47 35.80   -12 49 34.5         17KZ31    G96  C~2bsK      

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    -0.07       0.00     0.08
  2   0.0000     -5.08    -0.08      -0.04     0.12
  3   0.0001    -10.13    -0.07      -0.10     0.14
  4   0.0001    -15.10     0.04      -0.13     0.19
  5   0.0928 -16378.30     0.11     892.33     0.10
  6   0.0929 -16382.86    -0.01     892.82     0.06
  7   0.0929 -16387.16     0.16     893.50     0.21
  8   0.0929 -16391.69     0.28     893.84    -0.01
  9   0.8354 -26560.25     0.21    8998.61     0.41
 10   0.8354 -26563.44    -0.14    8997.56     0.10
 11   0.8354 -26566.38    -0.25    8996.80     0.07
 12   0.8354 -26569.02    -0.06    8996.24     0.25
 13   1.0102 -55012.41    -0.07    6219.66     0.21
 14   1.0103 -55013.86    -0.15    6219.53     0.09
 15   1.0103 -55018.51    -0.13    6219.56     0.11
 16   1.0103 -55019.85    -0.10    6219.61     0.15
 17   1.0103 -55024.62    -0.22    6219.55     0.09
 18   1.0103 -55026.01    -0.24    6219.48     0.02
 19   1.0563 -63696.01     0.49    6526.29    -0.27
 20   1.0563 -63698.54     0.10    6526.98     0.28
 21   1.0563 -63700.45     0.34    6526.92     0.09
 22   1.0563 -63702.92     0.02    6526.91    -0.05
 23   1.1249 -74936.36     0.26    7876.60     0.13
 24   1.1249 -74940.60     0.35    7877.32     0.07
 25   1.1249 -74944.88     0.38    7878.20     0.18
 26   1.1250 -74949.25     0.33    7878.82     0.03
 27   1.1268 -75208.15     0.02    7928.75     0.01
 28   1.1268 -75209.70    -0.06    7929.14     0.13
 29   1.1268 -75211.19    -0.09    7929.44     0.16
 30   1.1273 -75276.25     0.13    7940.86    -0.07
 31   1.1273 -75279.15     0.22    7941.63     0.15
 32   1.1273 -75283.74     0.05    7942.72    -0.05
 33   1.1273 -75283.20     0.19    7942.15    -0.08
 34   1.1273 -75285.24     0.08    7943.02    -0.04
 35   1.1273 -75284.95     0.22    7942.55    -0.00
 36   1.1273 -75287.00    -0.17    7943.16    -0.18
 37   1.1274 -75288.16     0.19    7943.52    -0.11
 38   1.1274 -75292.28    -0.15    7943.26    -0.64
 39   1.1274 -75295.29    -0.15    7942.72    -1.74
 40   1.1274 -75297.94    -0.18    7944.87    -0.08
 41   1.1276 -75325.01     0.17    7950.47    -0.03
 42   1.1276 -75325.39     0.18    7950.56    -0.01
 43   1.1276 -75325.79     0.16    7950.63    -0.01
 44   1.1301 -75669.26    -0.04    8017.97    -0.00
 45   1.1301 -75669.58 (   0.99)   8018.17 (  -0.07)
 46   1.1301 -75673.77    -0.94    8018.61    -0.06
 47   1.1301 -75673.43     0.47    8018.67    -0.21
 48   1.1302 -75675.32 (   1.06)   8019.00 (  -0.35)
 49   1.1302 -75676.98     0.24    8018.97    -0.55
 50   1.1309 -75776.79    -0.81    8039.73    -0.32
 51   1.1309 -75777.69    -0.74    8039.98    -0.26
 52   1.1309 -75778.73    -0.82    8040.15    -0.27
 53   1.8375 -80025.77     0.12   15412.67     0.05
 54   1.8375 -80030.79    -0.01   15411.66    -0.15
 55   1.8376 -80035.63     0.03   15410.89    -0.10
 56   1.8376 -80040.44     0.10   15410.16    -0.01
 57   1.9435 -99981.84    -0.10   13342.10     0.26
 58   1.9435 -99984.65     0.18   13341.63    -0.03
 59   1.9436 -99987.22     0.68   13341.42    -0.06
 60   1.9436 -99991.47    -0.49   13342.13     0.84
 61   2.0120-115067.21     0.08   12999.13    -0.42
 62   2.0120-115070.81    -0.42   13000.05     0.47
 63   2.0120-115073.46     0.03   12999.98     0.38
 64   2.0120-115076.43     0.15   12999.73     0.11

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.

17KZ31    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        53.835    53.850    53.820
ecceobj         0.797     0.797     0.797
incobj        161.663   161.663   161.663
qmin           10.509    10.633    10.422
qmax           98.252    97.320    97.115
amean          53.078    52.957    52.727
amin           52.110    52.149    51.884
amax           54.569    54.133    53.952
emean           0.795     0.794     0.795
emin            0.789     0.788     0.789
emax            0.802     0.800     0.801
imean         161.526   161.290   162.236
imin          160.381   160.381   160.381
imax          162.907   162.431   163.785
excite_mean     0.856     0.857     0.852
fracstop        0.042     0.046     0.043
cjmean         -0.955    -0.954    -0.953

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       182.1     172.8     184.6
kozaiamp        179.7     179.7     179.8