Orbit Fit and Astrometric record for 17CX33

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: 17CX33    
# Created Sat Dec 16 02:38:14 2017
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:  89.76d
# First observation: 2017/02/01
#  Last observation: 2017/05/02
Preliminary a, adot, b, bdot, g, gdot:
  -0.000514   0.132625  -0.001238  -0.221220   0.108628   0.000000
# Chi-squared of fit:    52.10 DOF:   44 RMS:  0.26
# Min/Max residuals:    -0.67    0.90
# Exact a, adot, b, bdot, g, gdot:
  1.403253E-05  9.086624E-02 -3.949684E-05 -2.625907E-01  1.049900E-01 -1.383990E-02
# Covariance matrix:
  1.9450E-13  2.1320E-12  1.5379E-15  2.4585E-13  9.7990E-13  8.7697E-12
  2.1320E-12  3.2517E-10 -4.2576E-12  1.7864E-10  5.8545E-11 -1.3023E-09
  1.5379E-15 -4.2576E-12  1.9395E-13 -4.4275E-12 -5.2138E-13  3.3365E-11
  2.4585E-13  1.7864E-10 -4.4275E-12  1.5869E-10  2.3950E-11 -1.2899E-09
  9.7990E-13  5.8545E-11 -5.2138E-13  2.3950E-11  1.3858E-11 -1.0402E-10
  8.7697E-12 -1.3023E-09  3.3365E-11 -1.2899E-09 -1.0402E-10  1.3147E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   20.149252  129.408121   -0.048079    0.339514   -0.924788  2457785.919991
# Heliocentric elements and errors
Epoch:              2457780.5000  =  2017/01/27
Mean Anomaly:          359.90325 +/-     0.002
Argument of Peri:      163.00747 +/-     0.051
Long of Asc Node:      315.88179 +/-     0.001
Inclination:            71.99777 +/-     0.004
Eccentricity:         0.85893825 +/-    0.0002
Semi-Major Axis:     74.08354694 +/-    0.1043
Time of Perihelion: 2457843.0951 +/-       1.3
Perihelion:          10.45035442 +/-    0.0205
Aphelion:           137.71673945 +/-    0.1945
Period (y)              637.6625 +/-      1.35
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -6.34264247 +/-    0.0002
Ecliptic Y            7.63532185 +/-    0.0002
Ecliptic Z            3.28057252 +/-    0.0001
Ecliptic XDOT        -0.00311025 +/-    0.0000
Ecliptic YDOT         0.00004974 +/-    0.0000
Ecliptic ZDOT        -0.00655294 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   10.45415752 +/-    0.0002
Geocenter to KBO      9.52471238 +/-    0.0003
# Hcoef: 10.84

The following table shows the complete astrometric record for 17CX33. 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 (17CX33) followed by the observatory code and reference code for the source of the astrometry.

2017 02  01.41919  09 13 44.536  +37 11 53.09  21.1w 17CX33    F51  C~28Fb      
2017 02  01.43072  09 13 44.197  +37 11 52.57  21.2w 17CX33    F51  C~28Fb      
2017 02  01.44209  09 13 43.838  +37 11 52.20  21.2w 17CX33    F51  C~28Fb      
2017 02  01.45345  09 13 43.485  +37 11 51.60  20.9w 17CX33    F51  C~28Fb      
2017 02  02.391851 09 13 15.371  +37 11 09.95  21.1G 17CX33    568  C~28Fb      
2017 02  02.392836 09 13 15.342  +37 11 09.90  21.2G 17CX33    568  C~28Fb      
2017 02  02.393819 09 13 15.310  +37 11 09.86  21.0G 17CX33    568  C~28Fb      
2017 02  07.46820  09 10 43.20   +37 06 42.3   20.2R 17CX33    291  C~28Fb      
2017 02  07.48070  09 10 42.83   +37 06 41.6   19.9R 17CX33    291  C~28Fb      
2017 02  21.23845  09 04 03.03   +36 48 19.8   21.0V 17CX33    I52  C~28Fb      
2017 02  21.25030  09 04 02.72   +36 48 18.3   21.2V 17CX33    I52  C~28Fb      
2017 02  21.25342  09 04 02.60   +36 48 19.3   20.2V 17CX33    G96  C~28Fb      
2017 02  21.25930  09 04 02.49   +36 48 17.4   21.2V 17CX33    G96  C~28Fb      
2017 02  21.26519  09 04 02.32   +36 48 17.0   20.4V 17CX33    G96  C~28Fb      
2017 02  21.27107  09 04 02.16   +36 48 16.7   20.7V 17CX33    G96  C~28Fb      
2017 02  21.27523  09 04 02.02   +36 48 16.1   21.3V 17CX33    I52  C~28Fb      
2017 02  22.21319  09 03 35.98   +36 46 40.5   20.9V 17CX33    I52  C~28Fb      
2017 02  22.22906  09 03 35.47   +36 46 38.4   21.4V 17CX33    I52  C~28Fb      
2017 02  22.24272  09 03 35.11   +36 46 37.2   20.9V 17CX33    I52  C~28Fb      
2017 02  22.25526  09 03 34.79   +36 46 36.3   21.9V 17CX33    I52  C~28Fb      
2017 02  23.377631 09 03 03.915  +36 44 38.46  21.4G 17CX33    568  C~28Fb      
2017 02  23.379169 09 03 03.872  +36 44 38.27  21.4G 17CX33    568  C~28Fb      
2017 02  23.380708 09 03 03.831  +36 44 38.09  21.4G 17CX33    568  C~28Fb      
2017 05  02.15252  08 47 21.75   +33 17 16.8   21.3R 17CX33    G37  C~2Faf      
2017 05  02.18393  08 47 21.78   +33 17 09.5         17CX33    G37  C~2Faf      

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    -0.01
  2   0.0000     -3.68     0.07      -1.78     0.00
  3   0.0001     -7.63    -0.11      -3.49     0.06
  4   0.0001    -11.44    -0.15      -5.39    -0.07
  5   0.0027   -316.94     0.05    -151.19    -0.10
  6   0.0027   -317.26     0.07    -151.35    -0.10
  7   0.0027   -317.61     0.04    -151.51    -0.11
  8   0.0166  -1961.50     0.04    -974.26     0.17
  9   0.0166  -1965.49     0.08    -976.29     0.27
 10   0.0543  -6205.67    -0.21   -3471.19    -0.03
 11   0.0543  -6208.79     0.18   -3473.72    -0.24
 12   0.0543  -6210.47    -0.57   -3473.19     0.90
 13   0.0543  -6211.17     0.46   -3475.39    -0.15
 14   0.0543  -6213.01     0.36   -3476.37     0.02
 15   0.0544  -6214.76     0.35   -3477.22     0.32
 16   0.0544  -6216.20     0.15   -3478.29     0.07
 17   0.0569  -6487.76     0.02   -3661.33     0.01
 18   0.0570  -6493.02    -0.58   -3665.13    -0.67
 19   0.0570  -6496.81    -0.38   -3667.55    -0.39
 20   0.0570  -6500.23    -0.12   -3669.53     0.09
 21   0.0601  -6821.37     0.09   -3890.51     0.01
 22   0.0601  -6821.81     0.10   -3890.85    -0.02
 23   0.0601  -6822.23     0.13   -3891.16    -0.03
 24   0.2457 -14639.25     0.06  -19092.06    -0.01
 25   0.2458 -14637.03    -0.06  -19099.10     0.02

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.

17CX33    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        74.802    76.383    73.288
ecceobj         0.860     0.862     0.857
incobj         71.970    71.976    71.963
qmin            8.908     8.408    10.051
qmax          140.723   230.621   173.521
amean          55.766    81.201    80.637
amin           43.073    62.457    69.682
amax           75.644   119.959    91.939
emean           0.820     0.879     0.871
emin            0.786     0.843     0.851
emax            0.863     0.923     0.887
imean          73.592    72.414    73.160
imin           72.620    70.468    72.034
imax           74.450    74.286    74.151
excite_mean     1.262     1.297     1.294
fracstop        0.077     0.152     0.026
cjmean          0.973     0.843     0.828

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       145.8     140.3     160.1
kozaiamp         20.0      20.3       3.6