Orbit Fit and Astrometric record for 17CD56

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: 17CD56    
# Created Thu Oct 31 01:10:32 2024
# Orbit generated from Bernstein formalism
# Fitting     25 observations of     25
# Arc:   1.06y
# First observation: 2016/02/12
#  Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
   0.000034   0.022451  -0.000003  -0.001919   0.024144   0.000000
# Chi-squared of fit:    19.51 DOF:     44 RMS:  0.16
# Min/Max residuals:    -0.44    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.444474E-05  2.249818E-02 -1.847502E-06 -1.922381E-03  2.422414E-02 -2.515186E-04
# Covariance matrix:
  7.3381E-13  7.1613E-13 -2.7889E-14 -9.2278E-14  1.2338E-12  6.5381E-11
  7.1613E-13  6.4884E-12 -9.4309E-14 -4.6749E-13  4.8149E-12  3.1262E-10
 -2.7889E-14 -9.4309E-14  4.2417E-13 -4.2707E-13 -1.0891E-13 -5.4881E-12
 -9.2278E-14 -4.6749E-13 -4.2707E-13  5.5758E-13 -3.8438E-13 -2.4610E-11
  1.2338E-12  4.8149E-12 -1.0891E-13 -3.8438E-13  4.9173E-12  2.6947E-10
  6.5381E-11  3.1262E-10 -5.4881E-12 -2.4610E-11  2.6947E-10  1.6665E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
  -12.877372  145.080243    0.042436   -0.219176   -0.959522  2457430.845210
# Heliocentric elements and errors
Epoch:              2457430.5000  =  2016/02/12
Mean Anomaly:          192.67432 +/-     4.460
Argument of Peri:       57.94537 +/-     4.459
Long of Asc Node:      256.50662 +/-     0.010
Inclination:            13.48504 +/-     0.001
Eccentricity:         0.06716342 +/-    0.0010
Semi-Major Axis:     39.63808842 +/-    0.0113
Time of Perihelion: 2499797.4857 +/-    1129.2
Perihelion:          36.97585896 +/-    0.0415
Aphelion:            42.30031788 +/-    0.0419
Period (y)              249.5613 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -33.78415865 +/-    0.0030
Ecliptic Y           23.63218117 +/-    0.0021
Ecliptic Z           -9.20021685 +/-    0.0008
Ecliptic XDOT        -0.00139352 +/-    0.0000
Ecliptic YDOT        -0.00213552 +/-    0.0000
Ecliptic ZDOT        -0.00020546 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.24326399 +/-    0.0027
Geocenter to KBO     41.28112772 +/-    0.0038
# Hcoef:  8.24

The following table shows the complete astrometric record for 17CD56. 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 (17CD56) followed by the observatory code and reference code for the source of the astrometry.

2016 02  12.344421 09 32 18.73   +01 00 09.3         17CD56    T09  C~83Ex      
2016 02  12.514449 09 32 17.90   +01 00 12.9         17CD56    T09  C~83Ex      
2016 04  04.246919 09 28 56.81   +01 23 09.1         17CD56    T09  C~83Ex      
2016 04  04.257515 09 28 56.78   +01 23 09.4         17CD56    T09  C~83Ex      
2017 01  21.36859  09 38 40.76   +00 22 15.1   24.2z 17CD56    T09  C~81Br      
2017 01  21.37198  09 38 40.75   +00 22 14.9   24.3z 17CD56    T09  C~81Br      
2017 01  21.37737  09 38 40.73   +00 22 15.1   24.8z 17CD56    T09  C~81Br      
2017 01  21.38540  09 38 40.69   +00 22 14.8   24.7z 17CD56    T09  C~81Br      
2017 01  21.39346  09 38 40.65   +00 22 14.9   24.8z 17CD56    T09  C~81Br      
2017 01  21.63521  09 38 39.61   +00 22 18.1   24.4z 17CD56    T09  C~81Br      
2017 01  21.64327  09 38 39.55   +00 22 18.5   23.8z 17CD56    T09  C~81Br      
2017 01  28.39139  09 38 09.47   +00 23 58.2   25.5g 17CD56    T09  C~81Br      
2017 01  28.39557  09 38 09.47   +00 23 58.2   25.2g 17CD56    T09  C~81Br      
2017 01  28.40405  09 38 09.40   +00 23 58.2   24.9g 17CD56    T09  C~81Br      
2017 01  28.41673  09 38 09.36   +00 23 58.2   25.4g 17CD56    T09  C~81Br      
2017 01  28.45922  09 38 09.16   +00 23 59.1   25.9g 17CD56    T09  C~81Br      
2017 02  01.47870  09 37 50.67   +00 25 08.6   24.1i 17CD56    T09  C~81Br      
2017 02  01.51997  09 37 50.45   +00 25 09.4   23.9i 17CD56    T09  C~81Br      
2017 02  01.62394  09 37 49.98   +00 25 11.3   23.7i 17CD56    T09  C~81Br      
2017 02  01.62661  09 37 49.95   +00 25 11.4   24.0i 17CD56    T09  C~81Br      
2017 03  04.37777  09 35 28.05   +00 37 18.1   23.7i 17CD56    T09  C~81Br      
2017 03  04.38579  09 35 28.02   +00 37 18.5   23.8i 17CD56    T09  C~81Br      
2017 03  04.38848  09 35 28.01   +00 37 18.6   23.8i 17CD56    T09  C~81Br      
2017 03  04.39116  09 35 28.00   +00 37 18.8   23.9i 17CD56    T09  C~81Br      
2017 03  04.41073  09 35 27.92   +00 37 19.1   23.8i 17CD56    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     0.05       0.00     0.12
     2   0.0005    -12.94    -0.07      -0.66    -0.12
     3   0.1421  -3312.84     0.04     317.02     0.04
     4   0.1421  -3313.36    -0.02     317.16     0.04
     5   0.9419   6160.32    -0.20    -279.52     0.06
     6   0.9419   6160.24    -0.05    -279.75    -0.15
     7   0.9419   6159.89    -0.04    -279.66    -0.01
     8   0.9419   6159.42     0.03    -280.14    -0.41
     9   0.9420   6158.82    -0.03    -280.24    -0.44
    10   0.9426   6143.02     0.36    -282.31    -0.23
    11   0.9426   6142.04    -0.08    -282.23    -0.07
    12   0.9611   5682.64    -0.09    -335.32     0.29
    13   0.9611   5682.64     0.20    -335.32     0.32
    14   0.9611   5681.65    -0.19    -335.67     0.03
    15   0.9612   5681.08     0.15    -335.86    -0.07
    16   0.9613   5677.95     0.04    -335.99     0.11
    17   0.9723   5392.91     0.19    -360.86     0.02
    18   0.9724   5389.53    -0.19    -361.18    -0.05
    19   0.9727   5382.24     0.09    -361.68     0.04
    20   0.9727   5381.78    -0.18    -361.74     0.01
    21   1.0569   3131.76    -0.06    -369.62    -0.10
    22   1.0569   3131.21    -0.04    -369.39     0.10
    23   1.0569   3131.03    -0.02    -369.34     0.13
    24   1.0569   3130.82    -0.04    -369.20     0.26
    25   1.0570   3129.59     0.13    -369.31     0.07

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.

17CD56    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.472    39.491    39.454
ecceobj         0.072     0.074     0.072
incobj         13.461    13.459    13.460
qmin           35.187    35.233    35.135
qmax           43.979    43.896    43.892
amean          39.461    39.461    39.461
amin           39.139    39.135    39.136
amax           39.804    39.812    39.808
emean           0.076     0.076     0.078
emin            0.052     0.051     0.054
emax            0.105     0.105     0.105
imean          15.056    15.087    15.047
imin           14.316    14.357    14.328
imax           15.768    15.807    15.772
excite_mean     0.271     0.271     0.271
fracstop        1.000     1.000     1.000
cjmean          2.967     2.967     2.967

libcent 0       177.1     179.5     179.4
libamp  0        54.3      57.8      50.6
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       180.3     180.7     180.6
kozaiamp        180.0     180.0     180.0