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: 17FD163 # Created Sun Dec 22 02:11:00 2024 # Orbit generated from Bernstein formalism # Fitting 13 observations of 13 # Arc: 1.14y # First observation: 2017/03/25 # Last observation: 2018/05/15 Preliminary a, adot, b, bdot, g, gdot: 0.000023 0.010663 -0.000003 -0.002390 0.016616 0.000000 # Chi-squared of fit: 24.38 DOF: 20 RMS: 0.24 # Min/Max residuals: -0.60 0.44 # Exact a, adot, b, bdot, g, gdot: 9.819147E-06 1.071485E-02 -1.482256E-06 -2.407620E-03 1.663436E-02 2.714685E-03 # Covariance matrix: 5.0275E-13 3.6921E-13 -3.5215E-15 -1.9903E-13 1.1644E-12 8.3105E-11 3.6921E-13 5.4889E-12 -2.2179E-14 -1.3286E-12 7.5673E-12 5.5608E-10 -3.5215E-15 -2.2179E-14 3.8955E-13 -3.7143E-13 -3.8114E-14 -2.4203E-12 -1.9903E-13 -1.3286E-12 -3.7143E-13 8.7256E-13 -2.0116E-12 -1.4876E-10 1.1644E-12 7.5673E-12 -3.8114E-14 -2.0116E-12 1.2160E-11 8.3750E-10 8.3105E-11 5.5608E-10 -2.4203E-12 -1.4876E-10 8.3750E-10 6.2321E-08 # lat0 lon0 xBary yBary zBary JD0 -4.244797 160.724332 -0.394989 -0.067333 -0.909495 2457837.592601 # Heliocentric elements and errors Epoch: 2457830.5000 = 2017/03/18 Mean Anomaly: 127.13801 +/- 2.478 Argument of Peri: 45.95902 +/- 2.091 Long of Asc Node: 323.10681 +/- 0.007 Inclination: 13.31396 +/- 0.005 Eccentricity: 0.36580752 +/- 0.0073 Semi-Major Axis: 47.59556958 +/- 0.2628 Time of Perihelion: 2415473.8975 +/- 747.5 Perihelion: 30.18475248 +/- 0.3862 Aphelion: 65.00638669 +/- 0.5002 Period (y) 328.3659 +/- 2.72 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -57.58537236 +/- 0.0119 Ecliptic Y 19.71400291 +/- 0.0042 Ecliptic Z -4.44980983 +/- 0.0009 Ecliptic XDOT -0.00097161 +/- 0.0000 Ecliptic YDOT -0.00153386 +/- 0.0000 Ecliptic ZDOT -0.00042833 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 61.02882784 +/- 0.0113 Geocenter to KBO 60.11651978 +/- 0.0126 # Hcoef: 6.86
The following table shows the complete astrometric record for 17FD163. 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 (17FD163) followed by the observatory code and reference code for the source of the astrometry.
2017 03 25.09180 10 42 24.224 +03 36 51.83 24.6r 17FD163 807 C~31Lz 2017 03 25.18432 10 42 23.929 +03 36 53.90 24.7r 17FD163 807 C~31Lz 2017 03 26.17398 10 42 21.010 +03 37 12.20 24.6r 17FD163 807 C~31Lz 2017 05 20.22178 10 40 43.577 +03 48 53.68 17FD163 G37 C~31Lz 2018 03 11.10997 10 45 13.401 +03 10 49.18 17FD163 304 C~31Lz 2018 03 11.17002 10 45 13.201 +03 10 49.93 24.6r 17FD163 304 C~31Lz 2018 03 11.24009 10 45 12.974 +03 10 51.54 17FD163 304 C~31Lz 2018 03 12.14828 10 45 09.943 +03 11 09.38 17FD163 304 C~31Lz 2018 03 12.22608 10 45 09.684 +03 11 10.93 17FD163 304 C~31Lz 2018 05 15.18273 10 42 49.088 +03 27 05.60 17FD163 G37 C~31Lz 2018 05 15.19010 10 42 49.084 +03 27 05.57 17FD163 G37 C~31Lz 2018 05 15.24396 10 42 49.044 +03 27 06.02 17FD163 G37 C~31Lz 2018 05 15.25138 10 42 49.036 +03 27 06.12 17FD163 G37 C~31Lz
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 0.08 0.00 -0.17
2 0.0003 -4.87 -0.24 0.26 0.09
3 0.0030 -52.24 0.18 0.77 0.24
4 0.1537 -1667.44 -0.03 102.41 -0.24
5 0.9610 2935.37 0.29 -493.73 0.20
6 0.9612 2932.31 0.44 -494.16 -0.18
7 0.9614 2928.55 0.43 -493.95 0.10
8 0.9639 2879.77 -0.57 -494.53 0.07
9 0.9641 2875.59 -0.60 -494.56 0.11
10 1.1392 565.48 0.03 -403.08 -0.04
11 1.1392 565.44 0.07 -403.13 -0.11
12 1.1394 564.71 -0.01 -402.94 -0.05
13 1.1394 564.56 -0.07 -402.89 -0.03
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.
17FD163 quality flag:2 Type: 2:1E CENTAURR CENTAURR axisobj 47.460 48.332 46.813 ecceobj 0.374 0.395 0.356 incobj 13.350 13.361 13.339 qmin 29.486 27.938 28.709 qmax 67.109 69.198 64.584 amean 47.796 47.937 44.583 amin 47.029 46.448 41.517 amax 48.707 49.519 47.388 emean 0.358 0.393 0.329 emin 0.339 0.349 0.273 emax 0.382 0.416 0.364 imean 15.803 14.464 14.937 imin 14.598 12.820 13.492 imax 16.491 17.461 16.873 excite_mean 0.450 0.467 0.419 fracstop 1.000 0.046 0.128 cjmean 2.893 2.871 2.890 libcent 0 179.8 -180.0 -180.0 libamp 0 163.5 -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 168.8 107.3 187.9 kozaiamp 180.0 57.8 149.6