Orbit Fit and Astrometric record for 17CJ55

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: 17CJ55    
# Created Tue Apr  1 01:11:03 2025
# Orbit generated from Bernstein formalism
# Fitting     20 observations of     20
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000038   0.021528   0.000000   0.000143   0.022571   0.000000
# Chi-squared of fit:    15.11 DOF:     34 RMS:  0.15
# Min/Max residuals:    -0.42    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.443476E-05  2.142808E-02  5.351045E-07  1.468272E-04  2.293331E-02 -9.621946E-04
# Covariance matrix:
  3.4521E-13  3.4022E-12  8.9534E-15 -1.4405E-14  1.6688E-12  1.4628E-10
  3.4022E-12  3.0318E-10  5.4579E-13 -1.3052E-12  1.0984E-10  1.1160E-08
  8.9534E-15  5.4579E-13  2.3837E-13 -2.8747E-13  2.1016E-13  2.0501E-11
 -1.4405E-14 -1.3052E-12 -2.8747E-13  5.0453E-13 -4.6580E-13 -4.7879E-11
  1.6688E-12  1.0984E-10  2.1016E-13 -4.6580E-13  4.1594E-11  4.1039E-09
  1.4628E-10  1.1160E-08  2.0501E-11 -4.7879E-11  4.1039E-09  4.1315E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.052321 -173.715471   -0.112644    0.052813   -0.987812  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          263.77168 +/-     7.098
Argument of Peri:      183.77058 +/-     6.811
Long of Asc Node:      103.69475 +/-     0.046
Inclination:             3.00852 +/-     0.000
Eccentricity:         0.04239360 +/-    0.0292
Semi-Major Axis:     44.31481119 +/-    0.0948
Time of Perihelion: 2486282.4692 +/-    2122.5
Perihelion:          42.43614688 +/-    1.2993
Aphelion:            46.19347550 +/-    1.2999
Period (y)              295.0065 +/-      0.95
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.25581374 +/-    0.0122
Ecliptic Y           -4.98938100 +/-    0.0013
Ecliptic Z            2.32190273 +/-    0.0007
Ecliptic XDOT         0.00039508 +/-    0.0001
Ecliptic YDOT        -0.00253710 +/-    0.0000
Ecliptic ZDOT         0.00001139 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.59666137 +/-    0.0121
Geocenter to KBO     43.60469570 +/-    0.0123
# Hcoef:  9.06

The following table shows the complete astrometric record for 17CJ55. 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 (17CJ55) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 27 54.51   +00 18 28.2         17CJ55    T09  C~81Bq      
2016 04  02.419999 12 27 54.40   +00 18 29.1         17CJ55    T09  C~81Bq      
2016 04  02.444565 12 27 54.29   +00 18 29.6         17CJ55    T09  C~81Bq      
2016 04  06.568131 12 27 36.91   +00 20 19.7         17CJ55    T09  C~81Bq      
2016 04  06.573767 12 27 36.92   +00 20 19.6         17CJ55    T09  C~81Bq      
2016 06  05.328496 12 24 40.23   +00 36 39.5         17CJ55    T09  C~81Bq      
2016 06  05.358251 12 24 40.20   +00 36 39.8         17CJ55    T09  C~81Bq      
2017 01  30.63152  12 36 01.48   -00 35 27.3   25.2z 17CJ55    T09  C~7zpj      
2017 01  30.63419  12 36 01.46   -00 35 27.3   25.3z 17CJ55    T09  C~7zpj      
2017 01  30.65979  12 36 01.44   -00 35 26.8   25.4z 17CJ55    T09  C~7zpj      
2017 01  30.66247  12 36 01.42   -00 35 26.8   25.1z 17CJ55    T09  C~7zpj      
2017 02  02.61286  12 35 55.75   -00 34 38.6   25.2i 17CJ55    T09  C~7zpj      
2017 02  02.61925  12 35 55.74   -00 34 38.8   25.4i 17CJ55    T09  C~7zpj      
2017 02  02.62764  12 35 55.72   -00 34 38.2   25.5i 17CJ55    T09  C~7zpj      
2017 02  02.65568  12 35 55.66   -00 34 37.9   25.3i 17CJ55    T09  C~7zpj      
2017 02  02.66749  12 35 55.65   -00 34 37.6   25.3i 17CJ55    T09  C~7zpj      
2017 02  23.53862  12 34 58.64   -00 27 21.7   25.9r 17CJ55    T09  C~7zpj      
2017 02  23.56555  12 34 58.56   -00 27 21.0   25.1r 17CJ55    T09  C~7zpj      
2017 02  23.63774  12 34 58.34   -00 27 19.1   26.3r 17CJ55    T09  C~7zpj      
2017 02  23.63983  12 34 58.29   -00 27 19.0   25.4r 17CJ55    T09  C~7zpj      

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    -0.09
     2   0.0001     -1.87     0.06       0.17     0.11
     3   0.0001     -3.58     0.07      -0.02    -0.07
     4   0.0114   -286.57    -0.42      -1.97     0.11
     5   0.0114   -286.39     0.15      -2.00     0.08
     6   0.1750  -3108.37     0.05    -149.70    -0.20
     7   0.1751  -3108.91     0.03    -149.60     0.02
     8   0.8302   7992.52     0.13     -83.74     0.01
     9   0.8302   7992.24    -0.06     -83.86    -0.12
    10   0.8303   7991.77     0.29     -83.52     0.14
    11   0.8303   7991.49     0.10     -83.64     0.01
    12   0.8384   7894.18    -0.14     -72.98     0.03
    13   0.8384   7894.12     0.03     -73.22    -0.23
    14   0.8384   7893.60    -0.18     -72.79     0.18
    15   0.8385   7892.66    -0.13     -72.87     0.01
    16   0.8385   7892.40     0.04     -72.65     0.19
    17   0.8957   6933.38    -0.15     -10.28    -0.23
    18   0.8957   6932.00     0.01     -10.11    -0.11
    19   0.8959   6928.21     0.33      -9.67     0.19
    20   0.8960   6927.48    -0.28      -9.87    -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.

17CJ55    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        43.853    44.259    43.805
ecceobj         0.045     0.122     0.031
incobj          3.008     3.008     3.008
qmin           41.496    34.956    42.021
qmax           46.834    54.716    46.194
amean          44.079    44.553    44.027
amin           43.744    44.047    43.680
amax           44.425    45.107    44.373
emean           0.040     0.154     0.027
emin            0.024     0.115     0.010
emax            0.055     0.213     0.041
imean           1.412     1.714     1.429
imin            0.779     0.290     0.790
imax            2.003     3.665     2.021
excite_mean     0.048     0.158     0.038
fracstop        1.000     1.000     1.000
cjmean          3.100     3.077     3.100

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       159.0     189.2     156.9
kozaiamp        179.9     180.0     180.0