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: 17CG56 # Created Sun Dec 22 02:10:56 2024 # Orbit generated from Bernstein formalism # Fitting 18 observations of 18 # Arc: 1.20y # First observation: 2016/02/12 # Last observation: 2017/04/27 Preliminary a, adot, b, bdot, g, gdot: 0.000014 0.087904 -0.000026 -0.017606 0.053050 0.000000 # Chi-squared of fit: 8.83 DOF: 30 RMS: 0.12 # Min/Max residuals: -0.34 0.23 # Exact a, adot, b, bdot, g, gdot: 2.643287E-05 8.634511E-02 -5.686063E-06 -1.730564E-02 5.157339E-02 -1.875024E-02 # Covariance matrix: 7.3406E-13 -2.0157E-13 1.2488E-15 -1.0771E-13 1.2046E-13 6.0810E-12 -2.0157E-13 6.5134E-10 3.4054E-12 -1.3670E-10 3.0233E-10 7.4393E-09 1.2488E-15 3.4054E-12 7.2481E-13 -1.4029E-12 1.5876E-12 3.8915E-11 -1.0771E-13 -1.3670E-10 -1.4029E-12 2.9476E-11 -6.3501E-11 -1.5632E-09 1.2046E-13 3.0233E-10 1.5876E-12 -6.3501E-11 1.4091E-10 3.4550E-09 6.0810E-12 7.4393E-09 3.8915E-11 -1.5632E-09 3.4550E-09 8.5076E-08 # lat0 lon0 xBary yBary zBary JD0 -11.398313 147.119340 0.076740 -0.193929 -0.962830 2457430.884467 # Heliocentric elements and errors Epoch: 2457430.5000 = 2016/02/12 Mean Anomaly: 353.12820 +/- 0.091 Argument of Peri: 257.64208 +/- 0.407 Long of Asc Node: 283.51251 +/- 0.005 Inclination: 15.58844 +/- 0.001 Eccentricity: 0.60190541 +/- 0.0029 Semi-Major Axis: 48.00240183 +/- 0.2715 Time of Perihelion: 2459749.2886 +/- 23.5 Perihelion: 19.10949670 +/- 0.1744 Aphelion: 76.89530697 +/- 0.4559 Period (y) 332.5850 +/- 2.82 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -16.74967948 +/- 0.0037 Ecliptic Y 10.91447355 +/- 0.0024 Ecliptic Z -3.83211070 +/- 0.0009 Ecliptic XDOT -0.00151695 +/- 0.0000 Ecliptic YDOT -0.00448473 +/- 0.0000 Ecliptic ZDOT -0.00070384 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 20.35589762 +/- 0.0033 Geocenter to KBO 19.38984570 +/- 0.0045 # Hcoef: 11.51
The following table shows the complete astrometric record for 17CG56. 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 (17CG56) followed by the observatory code and reference code for the source of the astrometry.
2016 02 12.383678 09 41 47.71 +01 44 25.2 17CG56 T09 C~86ur 2016 02 12.416367 09 41 47.41 +01 44 26.1 17CG56 T09 C~86ur 2017 01 28.50412 10 01 27.73 -01 00 09.6 24.1z 17CG56 T09 C~81Br 2017 01 28.53366 10 01 27.48 -01 00 08.9 23.9z 17CG56 T09 C~81Br 2017 01 28.54708 10 01 27.36 -01 00 08.6 24.4z 17CG56 T09 C~81Br 2017 01 28.56591 10 01 27.21 -01 00 08.7 24.1z 17CG56 T09 C~81Br 2017 02 02.37546 10 00 47.33 -00 58 26.9 25.2r 17CG56 T09 C~81Br 2017 02 02.37761 10 00 47.33 -00 58 27.0 25.1r 17CG56 T09 C~81Br 2017 02 02.39300 10 00 47.19 -00 58 26.4 24.2r 17CG56 T09 C~81Br 2017 02 02.41283 10 00 47.02 -00 58 25.9 24.5r 17CG56 T09 C~81Br 2017 02 02.42388 10 00 46.93 -00 58 25.7 24.7r 17CG56 T09 C~81Br 2017 03 06.44451 09 56 08.82 -00 38 49.2 24.0i 17CG56 T09 C~81Br 2017 03 06.44718 09 56 08.80 -00 38 49.1 24.1i 17CG56 T09 C~81Br 2017 03 06.46600 09 56 08.64 -00 38 48.2 24.1i 17CG56 T09 C~81Br 2017 03 06.47147 09 56 08.58 -00 38 47.7 24.1i 17CG56 T09 C~81Br 2017 03 22.241006 09 54 09.63 -00 26 14.8 17CG56 T09 C~86ur 2017 03 22.245952 09 54 09.59 -00 26 14.4 17CG56 T09 C~86ur 2017 04 27.338145 09 51 44.54 -00 00 38.2 17CG56 T09 C~86ur
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 0.01 0.00 0.08
2 0.0001 -4.54 -0.01 -0.65 -0.13
3 0.9613 20047.47 0.11 -3390.64 0.11
4 0.9614 20043.67 -0.01 -3391.23 0.23
5 0.9614 20041.86 -0.15 -3391.55 0.23
6 0.9615 20039.75 0.09 -3392.40 -0.16
7 0.9747 19436.59 -0.12 -3496.71 -0.12
8 0.9747 19436.63 0.20 -3496.80 -0.17
9 0.9747 19434.43 0.01 -3496.94 0.02
10 0.9748 19431.84 0.01 -3497.32 0.05
11 0.9748 19430.48 0.10 -3497.58 0.02
12 1.0625 15075.21 -0.07 -3783.23 -0.01
13 1.0625 15074.89 -0.03 -3783.24 -0.02
14 1.0625 15072.31 -0.06 -3783.19 -0.00
15 1.0625 15071.29 -0.34 -3783.02 0.16
16 1.1057 13128.59 0.16 -3669.38 -0.10
17 1.1057 13127.88 0.02 -3669.20 0.02
18 1.2045 10554.24 0.10 -2947.57 -0.19
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.
17CG56 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 47.400 47.752 47.088 ecceobj 0.595 0.597 0.594 incobj 15.581 15.587 15.575 qmin 18.906 17.871 18.895 qmax 79.565 80.802 75.896 amean 47.186 47.816 46.797 amin 45.913 44.554 45.542 amax 49.818 49.998 47.532 emean 0.587 0.607 0.589 emin 0.573 0.591 0.577 emax 0.599 0.624 0.598 imean 18.392 15.400 17.806 imin 17.138 13.467 17.123 imax 19.043 17.239 18.436 excite_mean 0.666 0.663 0.663 fracstop 0.012 0.054 0.005 cjmean 2.561 2.559 2.562 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 266.7 305.4 262.5 kozaiamp 9.1 179.9 3.8