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: 17CH56 # Created Wed Mar 26 01:11:06 2025 # Orbit generated from Bernstein formalism # Fitting 21 observations of 21 # Arc: 1.87y # First observation: 2015/03/22 # Last observation: 2017/02/01 Preliminary a, adot, b, bdot, g, gdot: 0.000043 0.021933 0.000001 0.003038 0.022761 0.000000 # Chi-squared of fit: 6.58 DOF: 36 RMS: 0.10 # Min/Max residuals: -0.26 0.21 # Exact a, adot, b, bdot, g, gdot: 1.384451E-05 2.151237E-02 2.109457E-06 3.051885E-03 2.376194E-02 2.156859E-03 # Covariance matrix: 1.8328E-13 -2.0229E-13 3.4558E-16 -1.3285E-14 -9.2071E-14 -2.4328E-12 -2.0229E-13 4.3705E-12 -6.0805E-15 4.3406E-13 1.1369E-12 7.5988E-11 3.4558E-16 -6.0805E-15 1.7656E-13 -1.0169E-13 -4.6422E-15 -1.3741E-13 -1.3285E-14 4.3406E-13 -1.0169E-13 1.4213E-13 1.6039E-13 8.1519E-12 -9.2071E-14 1.1369E-12 -4.6422E-15 1.6039E-13 1.2803E-12 2.9689E-11 -2.4328E-12 7.5988E-11 -1.3741E-13 8.1519E-12 2.9689E-11 1.4427E-09 # lat0 lon0 xBary yBary zBary JD0 -13.931483 141.762905 -0.631453 -0.184462 -0.744173 2457103.877264 # Heliocentric elements and errors Epoch: 2457100.5000 = 2015/03/19 Mean Anomaly: 118.51255 +/- 0.474 Argument of Peri: 169.25244 +/- 0.445 Long of Asc Node: 201.14382 +/- 0.003 Inclination: 15.93343 +/- 0.000 Eccentricity: 0.13791597 +/- 0.0012 Semi-Major Axis: 39.69590672 +/- 0.0146 Time of Perihelion: 2427027.3552 +/- 119.2 Perihelion: 34.22120730 +/- 0.0483 Aphelion: 45.17060613 +/- 0.0495 Period (y) 250.1075 +/- 0.14 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -33.07942859 +/- 0.0015 Ecliptic Y 25.25890623 +/- 0.0012 Ecliptic Z -10.13213094 +/- 0.0005 Ecliptic XDOT -0.00179342 +/- 0.0000 Ecliptic YDOT -0.00175099 +/- 0.0000 Ecliptic ZDOT 0.00028155 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.83597807 +/- 0.0014 Geocenter to KBO 42.08411233 +/- 0.0020 # Hcoef: 8.37
The following table shows the complete astrometric record for 17CH56. 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 (17CH56) followed by the observatory code and reference code for the source of the astrometry.
2015 03 22.376486 09 18 43.91 +01 02 04.3 17CH56 T09 C~86ur 2015 03 22.38922 09 18 43.86 +01 02 04.8 24.7i 17CH56 T09 C~8ifR 2015 03 22.39754 09 18 43.84 +01 02 05.0 24.8i 17CH56 T09 C~8ifR 2015 03 22.40303 09 18 43.83 +01 02 05.2 24.9i 17CH56 T09 C~8ifR 2015 03 22.41404 09 18 43.78 +01 02 05.5 25.4i 17CH56 T09 C~8ifR 2015 03 22.42499 09 18 43.75 +01 02 05.8 24.6i 17CH56 T09 C~8ifR 2015 03 22.43327 09 18 43.71 +01 02 06.2 24.8i 17CH56 T09 C~8ifR 2015 03 22.453542 09 18 43.66 +01 02 06.6 17CH56 T09 C~86ur 2016 01 12.369773 09 28 31.61 +00 20 59.8 17CH56 T09 C~86ur 2016 11 28.55912 09 35 10.51 +00 09 40.1 24.8r 17CH56 T09 C~81Br 2016 11 28.58230 09 35 10.51 +00 09 39.7 24.5r 17CH56 T09 C~81Br 2016 11 28.58442 09 35 10.50 +00 09 39.7 24.9r 17CH56 T09 C~81Br 2016 11 28.62032 09 35 10.49 +00 09 39.1 25.2r 17CH56 T09 C~81Br 2016 12 23.43184 09 34 27.93 +00 06 20.5 24.0z 17CH56 T09 C~81Br 2016 12 23.43719 09 34 27.91 +00 06 20.3 24.7z 17CH56 T09 C~81Br 2016 12 23.44791 09 34 27.87 +00 06 20.5 24.3z 17CH56 T09 C~81Br 2017 02 01.48410 09 31 54.59 +00 13 19.2 24.2i 17CH56 T09 C~81Br 2017 02 01.50616 09 31 54.48 +00 13 19.7 23.8i 17CH56 T09 C~81Br 2017 02 01.52538 09 31 54.39 +00 13 19.9 24.0i 17CH56 T09 C~81Br 2017 02 01.53367 09 31 54.35 +00 13 20.2 24.0i 17CH56 T09 C~81Br 2017 02 01.54729 09 31 54.30 +00 13 20.6 24.1i 17CH56 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 0.10 0.00 -0.02
2 0.0000 -0.87 -0.07 0.24 0.05
3 0.0001 -1.22 0.04 0.34 0.02
4 0.0001 -1.42 0.14 0.48 0.09
5 0.0001 -2.23 -0.06 0.53 -0.01
6 0.0001 -2.75 0.02 0.68 -0.02
7 0.0002 -3.44 -0.22 0.87 0.05
8 0.0002 -4.28 0.05 1.01 -0.09
9 0.8104 9149.38 -0.00 416.46 -0.10
10 1.6898 15065.78 -0.16 1647.42 0.01
11 1.6898 15065.90 0.09 1647.04 0.04
12 1.6898 15065.76 -0.04 1646.99 0.03
13 1.6899 15065.80 0.21 1646.37 0.04
14 1.7579 14518.80 0.04 1256.68 -0.05
15 1.7579 14518.58 0.03 1256.40 -0.26
16 1.7579 14517.94 -0.18 1256.40 -0.11
17 1.8675 12193.45 0.07 933.05 0.10
18 1.8676 12191.72 -0.06 933.01 0.10
19 1.8676 12190.37 -0.01 932.78 -0.09
20 1.8676 12189.70 -0.07 932.88 0.02
21 1.8677 12188.86 0.08 933.02 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.
17CH56 quality flag:3 Type: 3:2E 3:2E 3:2E axisobj 39.573 39.618 39.529 ecceobj 0.144 0.147 0.142 incobj 15.957 15.957 15.958 qmin 32.831 29.883 32.886 qmax 46.735 49.863 46.522 amean 39.457 39.457 39.457 amin 38.955 38.852 38.960 amax 40.004 40.129 39.989 emean 0.139 0.164 0.142 emin 0.111 0.065 0.118 emax 0.170 0.245 0.165 imean 16.526 15.557 16.325 imin 15.685 13.231 15.564 imax 17.363 18.382 17.114 excite_mean 0.317 0.317 0.315 fracstop 1.000 1.000 1.000 cjmean 2.937 2.936 2.938 libcent 0 179.6 184.0 179.2 libamp 0 128.9 169.4 122.4 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 173.4 241.5 178.7 kozaiamp 180.0 180.0 180.0