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: 20BU175 # Created Sun Apr 27 01:11:19 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 11 observations of 11 # Arc: 5.11y # First observation: 2020/01/24 # Last observation: 2025/03/04 # Chi-squared of fit: 5.23 DOF: 16 RMS: 0.12 # Min/Max residuals: -0.20 0.28 # Exact a, adot, b, bdot, g, gdot: 1.197006E-05 1.233239E-02 -3.488235E-06 -3.670722E-03 1.617891E-02 9.279681E-03 # Covariance matrix: 5.9807E-13 -6.8852E-13 -1.1161E-13 1.9378E-13 -3.9829E-13 -9.7993E-12 -6.8852E-13 1.4145E-12 2.5390E-13 -4.3224E-13 1.1887E-12 2.1892E-11 -1.1161E-13 2.5390E-13 3.4677E-13 -1.5136E-13 2.2769E-13 4.0188E-12 1.9378E-13 -4.3224E-13 -1.5136E-13 1.6752E-13 -3.6608E-13 -6.8474E-12 -3.9829E-13 1.1887E-12 2.2769E-13 -3.6608E-13 1.7759E-12 1.8627E-11 -9.7993E-12 2.1892E-11 4.0188E-12 -6.8474E-12 1.8627E-11 3.4678E-10 # lat0 lon0 xBary yBary zBary JD0 11.821680 129.195422 0.098776 0.202375 -0.966839 2458872.854851 # Heliocentric elements and errors Epoch: 2458872.5000 = 2020/01/24 Mean Anomaly: 15.26311 +/- 0.096 Argument of Peri: 53.93910 +/- 0.013 Long of Asc Node: 343.43239 +/- 0.001 Inclination: 20.06446 +/- 0.001 Eccentricity: 0.72086486 +/- 0.0014 Semi-Major Axis: 130.59612562 +/- 0.5423 Time of Perihelion: 2435760.6698 +/- 205.1 Perihelion: 36.45396826 +/- 0.2366 Aphelion: 224.73828299 +/- 0.9508 Period (y) 1492.4632 +/- 9.30 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -38.77699920 +/- 0.0032 Ecliptic Y 47.70569201 +/- 0.0039 Ecliptic Z 12.66231014 +/- 0.0010 Ecliptic XDOT -0.00266084 +/- 0.0000 Ecliptic YDOT -0.00002683 +/- 0.0000 Ecliptic ZDOT -0.00028652 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 62.76745026 +/- 0.0035 Geocenter to KBO 61.80832997 +/- 0.0051 # Hcoef: 7.54
The following table shows the complete astrometric record for 20BU175. 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 (20BU175) followed by the observatory code and reference code for the source of the astrometry.
2020 01 24.35405 09 00 45.632 +29 19 14.65 25.4r 20BU175 T09 C~8niV 2020 01 24.58331 09 00 44.758 +29 19 17.66 25.4r 20BU175 T09 C~8niV 2021 01 18.23828 09 03 51.870 +28 53 48.64 25.5r 20BU175 269 C~8niV 2021 01 18.28828 09 03 51.681 +28 53 49.23 25.4r 20BU175 269 C~8niV 2021 01 19.27979 09 03 48.099 +28 54 04.05 25.6r 20BU175 269 C~8niV 2021 03 17.13259 09 00 32.007 +29 01 43.80 25.5r 20BU175 269 C~8niV 2021 03 18.09940 09 00 29.525 +29 01 43.44 25.6r 20BU175 269 C~8niV 2025 01 07.29547 09 14 52.529 +27 16 34.45 25.4r 20BU175 269 C~8niV 2025 01 07.33226 09 14 52.408 +27 16 35.30 25.6r 20BU175 269 C~8niV 2025 03 04.18148 09 11 41.840 +27 27 42.08 25.7r 20BU175 269 C~8niV 2025 03 04.20576 09 11 41.770 +27 27 42.14 25.6r 20BU175 269 C~8niV
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 -0.02
2 0.0006 0.00 0.03 0.00 -0.20
3 0.9853 0.00 0.07 0.00 0.04
4 0.9854 0.00 -0.01 0.00 -0.11
5 0.9882 0.00 0.14 0.00 0.02
6 1.1438 0.00 -0.08 0.00 0.03
7 1.1465 0.00 -0.11 0.00 0.28
8 4.9553 0.00 -0.07 0.00 -0.07
9 4.9555 0.00 -0.16 0.00 0.21
10 5.1084 0.00 0.06 0.00 -0.06
11 5.1084 0.00 0.16 0.00 -0.13
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.
20BU175 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 135.894 135.897 135.890 ecceobj 0.731 0.731 0.731 incobj 20.046 20.046 20.046 qmin 35.049 35.111 35.092 qmax 243.754 239.716 244.313 amean 134.338 132.323 133.889 amin 130.205 128.656 129.875 amax 140.616 138.355 140.750 emean 0.725 0.723 0.726 emin 0.712 0.710 0.715 emax 0.737 0.736 0.738 imean 21.392 20.944 21.016 imin 20.245 20.244 20.245 imax 22.957 22.195 22.262 excite_mean 0.812 0.806 0.810 fracstop 1.000 1.000 1.000 cjmean 2.932 2.932 2.932 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 125.9 115.6 115.4 kozaiamp 72.0 59.8 57.7