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: 17CB56 # Created Tue Apr 1 01:11:03 2025 # Orbit generated from Bernstein formalism # Fitting 17 observations of 17 # Arc: 2.09y # First observation: 2017/01/28 # Last observation: 2019/03/03 Preliminary a, adot, b, bdot, g, gdot: -0.000043 0.022025 -0.000025 0.013505 0.023309 0.000000 # Chi-squared of fit: 9.32 DOF: 28 RMS: 0.13 # Min/Max residuals: -0.31 0.27 # Exact a, adot, b, bdot, g, gdot: 1.382943E-05 2.178470E-02 9.753678E-06 1.334581E-02 2.335840E-02 -7.185111E-03 # Covariance matrix: 1.8207E-13 -2.2484E-13 8.3312E-15 -6.7810E-14 1.0286E-13 -2.7131E-12 -2.2484E-13 1.3430E-12 -9.7726E-14 7.5284E-13 1.1393E-13 3.0556E-11 8.3312E-15 -9.7726E-14 1.5282E-13 -1.6931E-13 -1.7918E-14 -2.6183E-12 -6.7810E-14 7.5284E-13 -1.6931E-13 6.8277E-13 1.2151E-13 2.0104E-11 1.0286E-13 1.1393E-13 -1.7918E-14 1.2151E-13 5.3343E-13 5.1098E-12 -2.7131E-12 3.0556E-11 -2.6183E-12 2.0104E-11 5.1098E-12 8.1668E-10 # lat0 lon0 xBary yBary zBary JD0 -11.061337 154.002437 0.428644 -0.170220 -0.871639 2457782.011681 # Heliocentric elements and errors Epoch: 2457780.5000 = 2017/01/27 Mean Anomaly: 344.29022 +/- 0.039 Argument of Peri: 29.76505 +/- 0.119 Long of Asc Node: 170.52070 +/- 0.001 Inclination: 33.08953 +/- 0.001 Eccentricity: 0.50023010 +/- 0.0011 Semi-Major Axis: 77.03700917 +/- 0.1032 Time of Perihelion: 2468557.9268 +/- 15.4 Perihelion: 38.50077811 +/- 0.0960 Aphelion: 115.57324023 +/- 0.1748 Period (y) 676.1722 +/- 1.36 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -38.37834029 +/- 0.0012 Ecliptic Y 19.18685260 +/- 0.0006 Ecliptic Z -8.21334615 +/- 0.0003 Ecliptic XDOT -0.00064322 +/- 0.0000 Ecliptic YDOT -0.00253246 +/- 0.0000 Ecliptic ZDOT 0.00169673 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.68628356 +/- 0.0011 Geocenter to KBO 42.81114645 +/- 0.0013 # Hcoef: 8.47
The following table shows the complete astrometric record for 17CB56. 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 (17CB56) followed by the observatory code and reference code for the source of the astrometry.
2017 01 28.51088 10 07 35.96 -00 16 52.4 24.0z 17CB56 T09 C~81Bq 2017 01 28.51425 10 07 35.94 -00 16 52.2 24.5z 17CB56 T09 C~81Bq 2017 01 28.52565 10 07 35.89 -00 16 51.7 24.4z 17CB56 T09 C~81Bq 2017 01 28.53633 10 07 35.85 -00 16 51.4 24.9z 17CB56 T09 C~81Bq 2017 02 02.41503 10 07 16.27 -00 14 53.6 24.3r 17CB56 T09 C~81Bq 2017 02 02.48271 10 07 15.98 -00 14 51.6 24.7r 17CB56 T09 C~81Bq 2017 02 02.52029 10 07 15.83 -00 14 50.3 24.8r 17CB56 T09 C~81Bq 2017 03 29.23660 10 03 37.45 +00 15 04.4 25.7g 17CB56 T09 C~81Bq 2017 03 29.24497 10 03 37.41 +00 15 04.4 26.4g 17CB56 T09 C~81Bq 2017 03 29.25547 10 03 37.39 +00 15 04.8 26.0g 17CB56 T09 C~81Br 2018 01 17.48599 10 14 05.35 -00 04 38.7 24.2i 17CB56 T09 C~81Br 2018 01 17.51563 10 14 05.25 -00 04 38.0 24.7i 17CB56 T09 C~81Br 2018 01 17.54265 10 14 05.16 -00 04 37.7 24.8i 17CB56 T09 C~81Br 2018 01 17.59367 10 14 04.98 -00 04 36.7 24.7i 17CB56 T09 C~81Br 2018 01 17.61241 10 14 04.92 -00 04 36.5 24.1i 17CB56 T09 C~81Br 2019 01 04.513031 10 20 35.85 +00 08 26.3 17CB56 T09 C~81Br 2019 03 03.343756 10 16 56.77 +00 32 20.6 17CB56 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 0.19 0.00 -0.15
2 0.0000 -0.35 0.06 0.08 -0.07
3 0.0000 -1.23 -0.09 0.28 0.13
4 0.0001 -1.90 -0.07 0.34 0.19
5 0.0134 -318.30 0.20 5.35 -0.31
6 0.0136 -323.08 -0.02 5.66 -0.09
7 0.0137 -325.64 -0.05 6.07 0.27
8 0.1635 -4027.00 -0.03 510.99 0.12
9 0.1635 -4027.56 -0.11 510.77 -0.23
10 0.1636 -4027.99 0.06 511.04 -0.13
11 0.9691 5193.98 -0.10 2773.96 0.04
12 0.9692 5192.33 -0.12 2774.08 0.21
13 0.9693 5190.96 -0.01 2773.87 0.06
14 0.9694 5188.08 -0.09 2773.84 0.13
15 0.9695 5187.17 0.03 2773.71 0.03
16 1.9329 10393.81 0.07 5606.22 -0.10
17 2.0913 6804.49 0.07 5768.96 -0.10
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.
17CB56 quality flag:2 Type: SCATNEAR SCATNEAR 4:1EEE axisobj 76.060 76.300 75.825 ecceobj 0.492 0.495 0.490 incobj 33.208 33.209 33.207 qmin 36.472 36.574 37.464 qmax 118.454 118.640 116.847 amean 76.306 76.540 75.870 amin 75.250 75.474 74.584 amax 77.835 78.006 77.571 emean 0.502 0.503 0.492 emin 0.482 0.485 0.481 emax 0.522 0.521 0.508 imean 32.007 32.144 32.398 imin 31.251 31.444 32.034 imax 32.996 33.000 32.708 excite_mean 0.730 0.732 0.728 fracstop 1.000 1.000 1.000 cjmean 2.729 2.727 2.730 libcent 0 -180.0 -180.0 179.0 libamp 0 -180.0 -180.0 174.8 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 140.9 127.8 117.6 kozaiamp 112.8 99.5 84.8