Orbit Fit and Astrometric record for 17CE56

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: 17CE56    
# Created Tue Apr  1 01:11:03 2025
# Orbit generated from Bernstein formalism
# Fitting     25 observations of     25
# Arc:   0.92y
# First observation: 2016/04/02
#  Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000051   0.021864  -0.000003   0.001051   0.022405   0.000000
# Chi-squared of fit:    13.45 DOF:     44 RMS:  0.13
# Min/Max residuals:    -0.41    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.475982E-05  2.174353E-02 -6.316566E-07  1.061020E-03  2.283553E-02  1.075405E-03
# Covariance matrix:
  2.8561E-13  2.1155E-12  3.4167E-15  7.0728E-14  1.1669E-12  9.6456E-11
  2.1155E-12  1.2542E-10  1.0076E-13  3.4036E-12  4.9782E-11  4.7638E-09
  3.4167E-15  1.0076E-13  2.0397E-13 -2.3753E-13  4.9408E-14  4.1106E-12
  7.0728E-14  3.4036E-12 -2.3753E-13  4.9469E-13  1.3956E-12  1.3087E-10
  1.1669E-12  4.9782E-11  4.9408E-14  1.3956E-12  2.1222E-11  1.9378E-09
  9.6456E-11  4.7638E-09  4.1106E-12  1.3087E-10  1.9378E-09  1.8271E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.589746 -173.932872   -0.117284    0.062038   -0.986750  2457480.945354
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           50.16975 +/-     7.625
Argument of Peri:      355.47072 +/-     9.715
Long of Asc Node:      134.64258 +/-     0.020
Inclination:             4.47692 +/-     0.001
Eccentricity:         0.06498917 +/-    0.0170
Semi-Major Axis:     46.59849711 +/-    0.1106
Time of Perihelion: 2441288.6765 +/-    2460.2
Perihelion:          43.57009941 +/-    0.8012
Aphelion:            49.62689480 +/-    0.8031
Period (y)              318.1018 +/-      1.13
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.43515563 +/-    0.0088
Ecliptic Y           -4.84320559 +/-    0.0009
Ecliptic Z            2.74186473 +/-    0.0006
Ecliptic XDOT         0.00015560 +/-    0.0001
Ecliptic YDOT        -0.00261206 +/-    0.0000
Ecliptic ZDOT         0.00013504 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.78233489 +/-    0.0087
Geocenter to KBO     43.79141417 +/-    0.0088
# Hcoef:  8.16

The following table shows the complete astrometric record for 17CE56. 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 (17CE56) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.444565 12 27 57.68   +00 53 14.2         17CE56    T09  C~83Ex      
2016 04  04.37012  12 27 49.61   +00 54 05.6   25.8g 17CE56    T09  C~8COt      
2016 04  04.45424  12 27 49.30   +00 54 08.3   26.2g 17CE56    T09  C~8COt      
2016 04  04.48932  12 27 49.13   +00 54 09.1   25.0g 17CE56    T09  C~8COt      
2016 04  04.52167  12 27 48.99   +00 54 09.8   25.4g 17CE56    T09  C~8COt      
2016 04  04.55367  12 27 48.86   +00 54 10.6   25.5g 17CE56    T09  C~8COt      
2016 06  05.320049 12 24 46.18   +01 11 13.6         17CE56    T09  C~83Ex      
2016 06  05.332736 12 24 46.17   +01 11 13.6         17CE56    T09  C~83Ex      
2017 01  30.62076  12 36 10.27   +00 01 08.2   24.1z 17CE56    T09  C~81Br      
2017 01  30.62344  12 36 10.26   +00 01 08.2   24.4z 17CE56    T09  C~81Br      
2017 01  30.62613  12 36 10.26   +00 01 08.2   24.0z 17CE56    T09  C~81Br      
2017 01  30.62880  12 36 10.25   +00 01 08.2   24.1z 17CE56    T09  C~81Br      
2017 01  30.63419  12 36 10.24   +00 01 08.4   24.4z 17CE56    T09  C~81Br      
2017 01  30.65099  12 36 10.22   +00 01 08.7   24.2z 17CE56    T09  C~81Br      
2017 02  02.61286  12 36 04.65   +00 02 00.0   24.5i 17CE56    T09  C~81Br      
2017 02  02.62200  12 36 04.63   +00 02 00.0   24.4i 17CE56    T09  C~81Br      
2017 02  02.63046  12 36 04.62   +00 02 00.3   24.5i 17CE56    T09  C~81Br      
2017 02  02.65847  12 36 04.55   +00 02 00.8   24.7i 17CE56    T09  C~81Br      
2017 02  23.53862  12 35 08.45   +00 09 35.5   24.9r 17CE56    T09  C~81Br      
2017 02  23.57615  12 35 08.34   +00 09 36.0   24.8r 17CE56    T09  C~81Br      
2017 02  23.60801  12 35 08.22   +00 09 37.0   24.9r 17CE56    T09  C~81Br      
2017 02  23.65038  12 35 08.08   +00 09 38.3   24.7r 17CE56    T09  C~81Br      
2017 03  04.54977  12 34 36.76   +00 13 29.5   23.6y 17CE56    T09  C~81Br      
2017 03  04.59052  12 34 36.59   +00 13 30.7   24.1y 17CE56    T09  C~81Br      
2017 03  04.64192  12 34 36.40   +00 13 31.8   23.8y 17CE56    T09  C~81Br      

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     0.06       0.00     0.28
     2   0.0053   -131.50    -0.27      -0.67    -0.41
     3   0.0055   -136.83     0.20      -0.03     0.28
     4   0.0056   -139.49    -0.04      -0.31     0.02
     5   0.0057   -141.70    -0.02      -0.49    -0.15
     6   0.0058   -143.80     0.07      -0.53    -0.17
     7   0.1749  -3064.99    -0.03    -144.46     0.08
     8   0.1749  -3065.13     0.04    -144.52     0.07
     9   0.8301   8026.50     0.01      53.42     0.07
    10   0.8301   8026.36    -0.04      53.36     0.00
    11   0.8301   8026.36     0.04      53.36    -0.01
    12   0.8301   8026.22    -0.01      53.30    -0.08
    13   0.8301   8026.00    -0.05      53.42     0.02
    14   0.8301   8025.61     0.09      53.58     0.10
    15   0.8382   7928.43    -0.02      67.62     0.08
    16   0.8383   7928.15     0.03      67.50    -0.08
    17   0.8383   7927.90     0.08      67.72     0.10
    18   0.8384   7926.73    -0.09      67.76     0.02
    19   0.8955   6972.73    -0.18     152.25     0.09
    20   0.8956   6971.02     0.22     152.06    -0.21
    21   0.8957   6968.97    -0.02     152.26    -0.10
    22   0.8958   6966.52    -0.08     152.63     0.14
    23   0.9202   6443.03     0.12     178.97     0.03
    24   0.9203   6440.21    -0.14     179.07     0.03
    25   0.9205   6437.15     0.03     178.95    -0.20

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.

17CE56    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.098    46.629    45.839
ecceobj         0.060     0.113     0.021
incobj          4.486     4.488     4.484
qmin           42.626    40.683    44.225
qmax           50.261    53.384    48.103
amean          46.327    46.855    46.077
amin           45.951    46.464    45.715
amax           46.722    47.290    46.443
emean           0.064     0.116     0.023
emin            0.051     0.104     0.010
emax            0.076     0.129     0.036
imean           3.354     3.361     3.353
imin            3.005     2.995     3.001
imax            3.708     3.761     3.694
excite_mean     0.087     0.130     0.063
fracstop        1.000     1.000     1.000
cjmean          3.121     3.116     3.122

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       173.3     175.5     178.0
kozaiamp        180.0     180.0     180.0