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 Sun Dec 22 02:10:56 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