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: 20BF157 # Created Wed Jul 17 01:11:43 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 26 observations of 26 # Arc: 6.32y # First observation: 2017/12/23 # Last observation: 2024/04/17 # Chi-squared of fit: 15.06 DOF: 46 RMS: 0.13 # Min/Max residuals: -0.40 0.35 # Exact a, adot, b, bdot, g, gdot: 3.012216E-05 1.532591E-01 1.977555E-05 1.033526E-01 8.007842E-02 -2.985863E-02 # Covariance matrix: 1.2897E-13 -3.2429E-14 -2.7273E-16 7.7586E-16 1.3981E-14 -2.6473E-15 -3.2429E-14 1.2372E-14 1.5502E-16 3.1224E-16 4.7642E-15 -7.9954E-16 -2.7273E-16 1.5502E-16 1.2387E-13 -3.4963E-14 -3.7541E-15 1.7960E-15 7.7586E-16 3.1224E-16 -3.4963E-14 1.1437E-14 9.9437E-16 -5.6908E-17 1.3981E-14 4.7642E-15 -3.7541E-15 9.9437E-16 2.9010E-14 -6.8110E-15 -2.6473E-15 -7.9954E-16 1.7960E-15 -5.6908E-17 -6.8110E-15 1.9773E-15 # lat0 lon0 xBary yBary zBary JD0 -3.380374 106.648826 0.260471 -0.056138 -0.953186 2458110.904018 # Heliocentric elements and errors Epoch: 2458110.5000 = 2017/12/23 Mean Anomaly: 359.19049 +/- 0.001 Argument of Peri: 16.02168 +/- 0.000 Long of Asc Node: 110.18113 +/- 0.000 Inclination: 34.21331 +/- 0.000 Eccentricity: 0.86429616 +/- 0.0000 Semi-Major Axis: 95.79846889 +/- 0.0000 Time of Perihelion: 2458880.6203 +/- 0.6 Perihelion: 13.00021992 +/- 0.0001 Aphelion: 178.59671786 +/- 0.0001 Period (y) 937.6614 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -3.59781008 +/- 0.0000 Ecliptic Y 12.92669630 +/- 0.0000 Ecliptic Z -0.73612986 +/- 0.0000 Ecliptic XDOT -0.00478215 +/- 0.0000 Ecliptic YDOT -0.00228307 +/- 0.0000 Ecliptic ZDOT 0.00358749 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 13.43829357 +/- 0.0000 Geocenter to KBO 12.48786780 +/- 0.0000 # Hcoef: 12.49
The following table shows the complete astrometric record for 20BF157. 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 (20BF157) followed by the observatory code and reference code for the source of the astrometry.
2017 12 23.403217 07 10 26.908 +19 02 48.39 23.7G 20BF157 F51 C~7zrO 2019 01 03.570708 07 50 20.779 +23 58 24.09 23.4G 20BF157 F51 C~7zrO 2020 01 19.414291 08 33 39.260 +28 30 08.68 23.7G 20BF157 F51 C~7zrO 2020 01 21.375628 08 33 12.084 +28 33 52.46 23.2G 20BF157 F51 C~7zrO 2020 01 21.389766 08 33 11.859 +28 33 54.48 22.8G 20BF157 F51 C~7zrO 2020 01 21.418003 08 33 11.484 +28 33 57.34 23.6G 20BF157 F51 C~7zrO 2020 01 22.392211 08 32 57.930 +28 35 47.22 23.1G 20BF157 F51 C~7zrO 2020 01 22.403623 08 32 57.739 +28 35 48.91 23.0G 20BF157 F51 C~7zrO 2020 01 24.33755 08 32 30.691 +28 39 24.40 23.3r 20BF157 T09 C~7zrO 2020 01 24.56268 08 32 27.465 +28 39 49.22 23.2r 20BF157 T09 C~7zrO 2020 01 27.516875 08 31 45.979 +28 45 11.59 23.2G 20BF157 F52 C~7zrO 2020 02 25.326854 08 25 33.133 +29 28 06.15 23.5G 20BF157 T12 C~7zrO 2020 02 25.338751 08 25 33.012 +29 28 06.95 23.6G 20BF157 T12 C~7zrO 2020 02 25.350467 08 25 32.878 +29 28 07.77 23.6G 20BF157 T12 C~7zrO 2020 02 25.424871 08 25 32.042 +29 28 12.76 23.4G 20BF157 T12 C~7zrO 2020 02 25.436559 08 25 31.913 +29 28 13.59 23.3G 20BF157 T12 C~7zrO 2020 02 25.448195 08 25 31.782 +29 28 14.32 23.3G 20BF157 T12 C~7zrO 2020 03 24.363620 08 22 12.269 +29 49 53.80 23.6G 20BF157 T12 C~7zrO 2021 03 18.10579 09 11 39.498 +32 58 58.56 23.7r 20BF157 304 C~7zrO 2021 04 12.03850 09 09 48.662 +33 02 06.08 23.9r 20BF157 304 C~7zrO 2022 01 09.581166 10 15 33.168 +32 50 23.54 24.3G 20BF157 T12 C~7zrO 2022 01 09.612442 10 15 32.926 +32 50 28.32 24.3G 20BF157 T12 C~7zrO 2022 04 03.378916 09 59 54.783 +35 00 54.62 24.1G 20BF157 T12 C~7zrO 2024 03 06.23591 11 39 26.721 +34 45 59.33 23.6r 20BF157 G37 C~7zrO 2024 03 06.26059 11 39 26.435 +34 46 01.56 23.7r 20BF157 G37 C~7zrO 2024 04 17.434006 11 31 30.530 +35 16 36.24 24.2G 20BF157 T12 C~7zrO
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 0.13
2 1.0299 0.00 0.06 0.00 -0.15
3 2.0726 0.00 -0.22 0.00 -0.08
4 2.0780 0.00 -0.04 0.00 -0.13
5 2.0780 0.00 -0.40 0.00 0.27
6 2.0781 0.00 0.00 0.00 -0.09
7 2.0807 0.00 0.35 0.00 -0.18
8 2.0808 0.00 -0.07 0.00 0.22
9 2.0861 0.00 0.04 0.00 -0.07
10 2.0867 0.00 0.05 0.00 -0.14
11 2.0948 0.00 0.28 0.00 -0.00
12 2.1736 0.00 -0.05 0.00 0.05
13 2.1737 0.00 0.12 0.00 0.03
14 2.1737 0.00 0.07 0.00 0.05
15 2.1739 0.00 -0.06 0.00 -0.03
16 2.1739 0.00 -0.05 0.00 0.02
17 2.1740 0.00 -0.08 0.00 -0.04
18 2.2504 0.00 -0.00 0.00 -0.16
19 3.2326 0.00 0.12 0.00 0.12
20 3.3008 0.00 -0.06 0.00 0.18
21 4.0470 0.00 0.11 0.00 -0.03
22 4.0471 0.00 0.11 0.00 -0.01
23 4.2765 0.00 0.01 0.00 0.05
24 6.2008 0.00 -0.19 0.00 0.06
25 6.2008 0.00 0.10 0.00 -0.18
26 6.3163 0.00 -0.01 0.00 0.04
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.
20BF157 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 98.257 98.253 98.262 ecceobj 0.867 0.867 0.867 incobj 34.187 34.187 34.187 qmin 12.641 12.606 12.646 qmax 215.203 198.322 207.582 amean 99.819 93.766 92.753 amin 87.590 83.232 83.572 amax 115.015 105.864 110.468 emean 0.861 0.856 0.851 emin 0.843 0.840 0.819 emax 0.874 0.873 0.879 imean 34.548 34.168 34.824 imin 32.170 32.177 32.166 imax 37.300 36.802 38.262 excite_mean 1.031 1.024 1.025 fracstop 0.209 0.166 0.211 cjmean 1.824 1.835 1.832 libcent 0 -180.0 -180.0 -180.0 libamp 0 -180.0 -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 42.2 38.2 41.8 kozaiamp 22.4 20.0 23.7