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: 16SD58 # Created Mon Jul 7 01:11:20 2025 # Orbit generated from Bernstein formalism # Fitting 20 observations of 20 # Arc: 0.97y # First observation: 2015/10/10 # Last observation: 2016/09/28 Preliminary a, adot, b, bdot, g, gdot: -0.000002 0.029696 -0.000000 -0.003955 0.028002 0.000000 # Chi-squared of fit: 5.37 DOF: 34 RMS: 0.09 # Min/Max residuals: -0.22 0.24 # Exact a, adot, b, bdot, g, gdot: 1.677064E-05 2.980094E-02 -2.018006E-06 -3.965255E-03 2.805060E-02 2.208800E-03 # Covariance matrix: 2.9389E-13 1.6771E-11 6.9478E-14 -1.9353E-12 4.2707E-12 5.2532E-10 1.6771E-11 5.9811E-09 2.4887E-11 -6.7450E-10 1.3329E-09 1.8357E-07 6.9478E-14 2.4887E-11 2.0605E-13 -2.9316E-12 5.5438E-12 7.6386E-10 -1.9353E-12 -6.7450E-10 -2.9316E-12 7.6620E-11 -1.5044E-10 -2.0705E-08 4.2707E-12 1.3329E-09 5.5438E-12 -1.5044E-10 2.9886E-10 4.0938E-08 5.2532E-10 1.8357E-07 7.6386E-10 -2.0705E-08 4.0938E-08 5.6350E-06 # lat0 lon0 xBary yBary zBary JD0 -14.241846 28.091240 0.198744 -0.241551 -0.952373 2457306.018909 # Heliocentric elements and errors Epoch: 2457300.5000 = 2015/10/05 Mean Anomaly: 40.60283 +/- 23.951 Argument of Peri: 193.19030 +/- 32.168 Long of Asc Node: 147.24748 +/- 0.075 Inclination: 15.82886 +/- 0.011 Eccentricity: 0.09372844 +/- 0.0658 Semi-Major Axis: 39.22781806 +/- 0.6347 Time of Perihelion: 2447179.0340 +/- 5965.3 Perihelion: 35.55105589 +/- 2.6444 Aphelion: 42.90458022 +/- 2.6728 Period (y) 245.6968 +/- 5.96 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 31.44010875 +/- 0.0188 Ecliptic Y 16.55776441 +/- 0.0100 Ecliptic Z -8.77049538 +/- 0.0054 Ecliptic XDOT -0.00127093 +/- 0.0002 Ecliptic YDOT 0.00261306 +/- 0.0001 Ecliptic ZDOT -0.00042812 +/- 0.0001 # Distances at JD0 (AU) Heliocenter to KBO 36.60002172 +/- 0.0168 Geocenter to KBO 35.64985709 +/- 0.0220 # Hcoef: 8.92
The following table shows the complete astrometric record for 16SD58. 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 (16SD58) followed by the observatory code and reference code for the source of the astrometry.
2015 10 10.51812 02 04 33.22 -02 31 53.1 24.5r 16SD58 T09 C~8vIL 2015 10 10.54879 02 04 33.06 -02 31 54.1 24.5r 16SD58 T09 C~8vIL 2015 10 10.60093 02 04 32.81 -02 31 55.9 24.2r 16SD58 T09 C~8vIL 2015 10 14.51991 02 04 13.31 -02 34 09.9 25.2g 16SD58 T09 C~8eVS 2015 10 14.55055 02 04 13.13 -02 34 11.3 25.2g 16SD58 T09 C~8eVS 2015 10 14.57894 02 04 13.00 -02 34 12.3 25.4g 16SD58 T09 C~8eVS 2015 10 14.60271 02 04 12.87 -02 34 12.8 25.2g 16SD58 T09 C~8eVS 2015 11 06.46299 02 02 15.54 -02 45 15.7 24.3z 16SD58 T09 C~8eVS 2015 11 06.50498 02 02 15.33 -02 45 16.8 24.5z 16SD58 T09 C~8eVS 2015 11 06.52457 02 02 15.23 -02 45 17.3 24.0z 16SD58 T09 C~8eVS 2015 11 10.39623 02 01 55.81 -02 46 43.4 24.6i 16SD58 T09 C~8eVS 2015 11 10.40854 02 01 55.77 -02 46 43.8 24.2i 16SD58 T09 C~8eVS 2015 11 10.41958 02 01 55.70 -02 46 44.0 24.2i 16SD58 T09 C~8eVS 2015 11 10.44606 02 01 55.57 -02 46 44.6 24.0i 16SD58 T09 C~8eVS 2015 11 10.45724 02 01 55.52 -02 46 44.8 24.3i 16SD58 T09 C~8eVS 2015 11 10.46823 02 01 55.46 -02 46 45.0 24.0i 16SD58 T09 C~8eVS 2016 09 27.52266 02 12 11.20 -02 01 25.4 25.1g 16SD58 568 C~2eAJ 2016 09 27.58184 02 12 10.94 -02 01 27.6 24.7g 16SD58 568 C~2eAJ 2016 09 28.47127 02 12 07.09 -02 02 00.3 24.9g 16SD58 568 C~2eAJ 2016 09 28.59154 02 12 06.56 -02 02 04.6 25.0g 16SD58 568 C~2eAJ
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 -0.04
2 0.0001 -2.60 -0.06 -0.09 0.05
3 0.0002 -6.74 0.09 -0.46 0.01
4 0.0110 -327.39 0.24 -23.29 0.13
5 0.0110 -330.41 -0.22 -23.66 -0.10
6 0.0111 -332.59 -0.02 -23.91 -0.22
7 0.0112 -334.59 -0.04 -23.69 0.11
8 0.0738 -2213.54 -0.04 -27.31 0.07
9 0.0739 -2216.88 0.01 -27.23 -0.07
10 0.0739 -2218.45 -0.00 -27.18 -0.11
11 0.0845 -2521.17 -0.13 -5.74 0.19
12 0.0846 -2521.87 0.13 -5.90 -0.06
13 0.0846 -2522.92 -0.06 -5.72 0.05
14 0.0847 -2524.96 -0.02 -5.60 -0.01
15 0.0847 -2525.73 0.08 -5.52 -0.01
16 0.0847 -2526.64 0.03 -5.40 0.04
17 0.9665 7071.16 0.00 -705.04 -0.02
18 0.9666 7066.73 0.00 -705.73 -0.04
19 0.9691 7001.12 -0.06 -715.99 -0.01
20 0.9694 6992.16 0.06 -717.21 0.06
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.
16SD58 quality flag:1 Type: 3:2E REMOVED CLASSICAL axisobj 39.645 44.558 38.742 ecceobj 0.103 0.309 0.082 incobj 15.796 15.835 15.769 qmin 34.755 30.382 34.553 qmax 44.577 58.313 42.695 amean 39.459 44.023 38.476 amin 39.066 42.908 38.179 amax 39.901 44.689 38.814 emean 0.097 0.300 0.081 emin 0.076 0.283 0.060 emax 0.119 0.311 0.101 imean 14.910 14.720 12.712 imin 14.314 14.578 8.942 imax 15.626 14.931 17.732 excite_mean 0.275 0.393 0.235 fracstop 1.000 0.002 1.000 cjmean 2.965 2.920 2.979 libcent 0 179.7 -180.0 -180.0 libamp 0 88.1 -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 178.1 175.7 176.9 kozaiamp 180.0 3.3 180.0