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: 17BM231 # Created Wed May 8 01:18:05 2024 # Orbit generated from Bernstein formalism # Fitting 18 observations of 18 # Arc: 68.97d # First observation: 2016/12/25 # Last observation: 2017/03/04 Preliminary a, adot, b, bdot, g, gdot: 0.000004 0.038372 0.000005 0.005470 0.032374 0.000000 # Chi-squared of fit: 8.71 DOF: 30 RMS: 0.12 # Min/Max residuals: -0.22 0.26 # Exact a, adot, b, bdot, g, gdot: 1.905194E-05 3.697505E-02 2.237374E-06 5.339990E-03 3.182011E-02 1.820333E-03 # Covariance matrix: 3.5968E-13 -3.6047E-12 9.2995E-15 -9.8517E-14 4.7301E-13 1.6204E-10 -3.6047E-12 5.3190E-09 2.5037E-11 4.0015E-10 1.1553E-09 4.6888E-08 9.2995E-15 2.5037E-11 3.6285E-13 2.8599E-13 5.5995E-12 2.5004E-10 -9.8517E-14 4.0015E-10 2.8599E-13 4.6306E-11 8.7583E-11 3.6176E-09 4.7301E-13 1.1553E-09 5.5995E-12 8.7583E-11 2.5874E-10 1.1605E-08 1.6204E-10 4.6888E-08 2.5004E-10 3.6176E-09 1.1605E-08 6.8982E-07 # lat0 lon0 xBary yBary zBary JD0 -13.038250 148.864381 0.810786 -0.126874 -0.548762 2457747.965269 # Heliocentric elements and errors Epoch: 2457740.5000 = 2016/12/18 Mean Anomaly: 9.06414 +/- 8.380 Argument of Peri: 289.20716 +/- 10.967 Long of Asc Node: 205.54414 +/- 0.056 Inclination: 14.97977 +/- 0.009 Eccentricity: 0.12429142 +/- 0.0083 Semi-Major Axis: 36.44194352 +/- 0.1758 Time of Perihelion: 2455717.3658 +/- 1870.3 Perihelion: 31.91252258 +/- 0.3407 Aphelion: 40.97136446 +/- 0.3625 Period (y) 219.9938 +/- 1.59 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -26.27264449 +/- 0.0132 Ecliptic Y 16.81155057 +/- 0.0080 Ecliptic Z -7.08987673 +/- 0.0036 Ecliptic XDOT -0.00186176 +/- 0.0001 Ecliptic YDOT -0.00259732 +/- 0.0000 Ecliptic ZDOT 0.00041223 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 31.98666024 +/- 0.0117 Geocenter to KBO 31.42667035 +/- 0.0159 # Hcoef: 9.47
The following table shows the complete astrometric record for 17BM231. 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 (17BM231) followed by the observatory code and reference code for the source of the astrometry.
2016 12 25.46448 09 46 00.29 -00 22 43.6 24.7r 17BM231 T09 C~7xTm 2016 12 25.48124 09 46 00.24 -00 22 43.9 24.4r 17BM231 T09 C~7xTm 2016 12 25.49171 09 46 00.20 -00 22 43.7 24.7r 17BM231 T09 C~7xTm 2016 12 25.50217 09 46 00.18 -00 22 43.9 24.5r 17BM231 T09 C~7xTm 2017 01 21.37737 09 44 01.96 -00 18 44.1 24.0z 17BM231 T09 C~7xTm 2017 01 21.56723 09 44 00.92 -00 18 40.2 23.7z 17BM231 T09 C~7xTm 2017 01 21.63253 09 44 00.56 -00 18 39.0 23.9z 17BM231 T09 C~7xTm 2017 01 21.64058 09 44 00.54 -00 18 38.8 23.9z 17BM231 T09 C~7xTm 2017 01 28.43816 09 43 23.14 -00 16 12.0 26.0g 17BM231 T09 C~7xTm 2017 01 28.45502 09 43 23.03 -00 16 11.7 25.6g 17BM231 T09 C~7xTm 2017 01 28.47182 09 43 22.94 -00 16 11.0 25.2g 17BM231 T09 C~7xTm 2017 01 28.47671 09 43 22.93 -00 16 11.0 26.0g 17BM231 T09 C~7xTm 2017 03 04.39116 09 40 01.57 +00 02 59.8 23.8i 17BM231 T09 C~7xTm 2017 03 04.41889 09 40 01.40 +00 03 00.6 24.0i 17BM231 T09 C~7xTm 2017 03 04.42156 09 40 01.39 +00 03 00.8 24.2i 17BM231 T09 C~7xTm 2017 03 04.42430 09 40 01.39 +00 03 00.9 24.1i 17BM231 T09 C~7xTm 2017 03 04.42698 09 40 01.36 +00 03 01.1 24.0i 17BM231 T09 C~7xTm 2017 03 04.43238 09 40 01.33 +00 03 01.3 24.1i 17BM231 T09 C~7xTm
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 -0.14 0.00 0.09
2 0.0000 -0.60 0.04 -0.54 -0.14
3 0.0001 -1.24 -0.11 -0.55 0.04
4 0.0001 -1.45 0.16 -0.84 -0.06
5 0.0737 -1750.45 0.19 -379.20 -0.11
6 0.0742 -1766.44 0.00 -380.84 0.11
7 0.0744 -1771.93 -0.05 -381.55 0.03
8 0.0744 -1772.28 0.26 -381.47 0.19
9 0.0930 -2349.79 -0.05 -434.49 -0.06
10 0.0931 -2351.45 -0.20 -434.77 -0.22
11 0.0931 -2352.96 -0.21 -434.57 0.09
12 0.0931 -2353.10 0.09 -434.62 0.07
13 0.1887 -5586.12 0.07 -381.27 0.19
14 0.1888 -5588.79 -0.07 -381.39 -0.18
15 0.1888 -5589.00 -0.03 -381.25 -0.06
16 0.1888 -5589.04 0.18 -381.16 0.01
17 0.1888 -5589.53 -0.06 -381.12 0.02
18 0.1888 -5590.02 -0.06 -381.09 0.00
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.
17BM231 quality flag:2 Type: 4:3E CENTAURR CENTAURR axisobj 36.383 37.661 35.448 ecceobj 0.122 0.174 0.092 incobj 14.993 14.967 15.022 qmin 31.175 28.773 29.115 qmax 42.276 50.386 52.042 amean 36.477 37.969 35.704 amin 36.045 36.526 34.856 amax 36.947 40.405 41.374 emean 0.126 0.198 0.093 emin 0.083 0.158 0.030 emax 0.145 0.250 0.258 imean 16.830 14.295 13.731 imin 15.235 12.052 9.054 imax 18.449 15.325 15.764 excite_mean 0.316 0.318 0.259 fracstop 1.000 0.081 0.776 cjmean 2.915 2.931 2.948 libcent 0 176.6 -180.0 -180.0 libamp 0 136.2 -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 182.2 217.6 183.7 kozaiamp 180.0 179.3 179.9