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: 20BT175
# Created Wed Apr 30 01:11:18 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 9 observations of 9
# Arc: 5.11y
# First observation: 2020/01/25
# Last observation: 2025/03/04
# Chi-squared of fit: 5.14 DOF: 12 RMS: 0.13
# Min/Max residuals: -0.23 0.20
# Exact a, adot, b, bdot, g, gdot:
1.183694E-05 1.192006E-02 6.507092E-07 9.188892E-05 1.610141E-02 -6.761781E-03
# Covariance matrix:
7.1702E-13 -6.3077E-13 -6.9188E-15 -2.2332E-15 -5.7298E-13 -7.9186E-12
-6.3077E-13 1.1171E-12 5.1783E-15 4.1143E-15 6.2430E-13 1.6404E-11
-6.9188E-15 5.1783E-15 3.7024E-13 -8.1084E-14 1.9010E-14 5.4302E-14
-2.2332E-15 4.1143E-15 -8.1084E-14 3.1037E-14 2.9281E-15 6.1303E-14
-5.7298E-13 6.2430E-13 1.9010E-14 2.9281E-15 1.3177E-12 7.9995E-12
-7.9186E-12 1.6404E-11 5.4302E-14 6.1303E-14 7.9995E-12 2.4990E-10
# lat0 lon0 xBary yBary zBary JD0
8.883407 129.887728 0.093757 0.152636 -0.976510 2458873.829881
# Heliocentric elements and errors
Epoch: 2458874.5000 = 2020/01/26
Mean Anomaly: 315.40402 +/- 0.117
Argument of Peri: 192.39928 +/- 0.031
Long of Asc Node: 42.34930 +/- 0.006
Inclination: 8.75442 +/- 0.000
Eccentricity: 0.51458220 +/- 0.0011
Semi-Major Axis: 74.42931758 +/- 0.1168
Time of Perihelion: 2487928.6171 +/- 489.7
Perihelion: 36.12931588 +/- 0.1020
Aphelion: 112.72931929 +/- 0.1962
Period (y) 642.1319 +/- 1.51
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.90857966 +/- 0.0028
Ecliptic Y 47.89336102 +/- 0.0033
Ecliptic Z 9.59072930 +/- 0.0007
Ecliptic XDOT -0.00081690 +/- 0.0000
Ecliptic YDOT -0.00217105 +/- 0.0000
Ecliptic ZDOT -0.00016234 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 63.07537598 +/- 0.0031
Geocenter to KBO 62.10678677 +/- 0.0044
# Hcoef: 7.63
The following table shows the complete astrometric record for 20BT175. 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 (20BT175) followed by the observatory code and reference code for the source of the astrometry.
2020 01 25.32908 08 59 54.333 +26 18 37.86 25.4r 20BT175 T09 C~8niV 2020 01 25.55704 08 59 53.496 +26 18 41.30 25.4r 20BT175 T09 C~8niV 2020 12 16.34133 09 04 50.788 +25 56 15.60 25.4r 20BT175 269 C~8niV 2020 12 17.33623 09 04 48.531 +25 56 31.37 25.5r 20BT175 269 C~8niV 2021 01 15.28901 09 03 23.203 +26 04 37.15 25.4r 20BT175 269 C~8niV 2025 01 07.30531 09 15 52.824 +25 11 54.22 25.4r 20BT175 269 C~8niV 2025 01 07.34241 09 15 52.685 +25 11 54.99 25.5r 20BT175 269 C~8niV 2025 03 04.17262 09 12 34.937 +25 25 49.32 25.6r 20BT175 269 C~8niV 2025 03 04.19732 09 12 34.878 +25 25 49.41 25.6r 20BT175 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 -0.07 0.00 -0.10
2 0.0006 0.00 -0.04 0.00 -0.19
3 0.8926 0.00 0.09 0.00 0.20
4 0.8953 0.00 -0.04 0.00 0.08
5 0.9746 0.00 0.14 0.00 0.05
6 4.9527 0.00 0.19 0.00 0.05
7 4.9528 0.00 -0.10 0.00 0.15
8 5.1057 0.00 -0.23 0.00 -0.05
9 5.1057 0.00 0.10 0.00 -0.18
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.
20BT175 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 74.585 74.584 74.586 ecceobj 0.509 0.509 0.509 incobj 8.743 8.743 8.743 qmin 35.540 35.571 35.533 qmax 116.492 116.045 116.813 amean 74.641 74.068 74.483 amin 73.014 72.686 72.820 amax 76.370 76.179 76.509 emean 0.512 0.509 0.511 emin 0.498 0.495 0.497 emax 0.526 0.523 0.527 imean 7.771 7.710 7.733 imin 7.201 7.188 7.155 imax 8.550 8.393 8.407 excite_mean 0.530 0.526 0.529 fracstop 1.000 1.000 1.000 cjmean 3.082 3.082 3.083 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 187.7 193.8 185.7 kozaiamp 180.0 180.0 180.0