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: 20UT74 # Created Tue Apr 1 01:11:22 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 0.96y # First observation: 2020/10/20 # Last observation: 2021/10/06 Preliminary a, adot, b, bdot, g, gdot: 0.000003 0.021274 -0.000000 0.001120 0.022694 0.000000 # Chi-squared of fit: 10.33 DOF: 10 RMS: 0.20 # Min/Max residuals: -0.42 0.43 # Exact a, adot, b, bdot, g, gdot: 1.495205E-05 2.117678E-02 7.543406E-07 1.112705E-03 2.249277E-02 -3.122252E-03 # Covariance matrix: 8.4355E-13 5.0865E-11 -3.1963E-14 2.4222E-12 3.8894E-11 2.3885E-09 5.0865E-11 5.5427E-09 -3.4495E-12 2.6163E-10 4.1951E-09 2.5805E-07 -3.1963E-14 -3.4495E-12 3.7079E-13 -5.6246E-13 -2.6180E-12 -1.6073E-10 2.4222E-12 2.6163E-10 -5.6246E-13 1.3214E-11 1.9830E-10 1.2187E-08 3.8894E-11 4.1951E-09 -2.6180E-12 1.9830E-10 3.1867E-09 1.9553E-07 2.3885E-09 2.5805E-07 -1.6073E-10 1.2187E-08 1.9553E-07 1.2019E-05 # lat0 lon0 xBary yBary zBary JD0 -3.081440 -6.586443 -0.553319 -0.044395 -0.823640 2459142.505034 # Heliocentric elements and errors Epoch: 2459140.5000 = 2020/10/18 Mean Anomaly: 296.80519 +/- 5.272 Argument of Peri: 33.50690 +/- 12.239 Long of Asc Node: 38.88802 +/- 0.047 Inclination: 4.29001 +/- 0.004 Eccentricity: 0.13849475 +/- 0.1657 Semi-Major Axis: 47.46786339 +/- 2.5479 Time of Perihelion: 2480109.4602 +/- 458.2 Perihelion: 40.89381356 +/- 8.1668 Aphelion: 54.04191321 +/- 8.3841 Period (y) 327.0452 +/- 26.33 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 44.99052630 +/- 0.1107 Ecliptic Y -4.64282081 +/- 0.0128 Ecliptic Z -2.38989595 +/- 0.0060 Ecliptic XDOT -0.00006684 +/- 0.0004 Ecliptic YDOT 0.00260847 +/- 0.0000 Ecliptic ZDOT 0.00015546 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 45.29254734 +/- 0.1100 Geocenter to KBO 44.45873990 +/- 0.1116 # Hcoef: 9.11
The following table shows the complete astrometric record for 20UT74. 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 (20UT74) followed by the observatory code and reference code for the source of the astrometry.
2020 10 20.004233 23 40 42.428 -05 26 39.78 25.5r 20UT74 W84 C~7XOR 2020 10 20.172968 23 40 41.839 -05 26 42.92 25.5r 20UT74 W84 C~7XOR 2020 10 22.003924 23 40 35.692 -05 27 16.52 25.7r 20UT74 W84 C~7XOR 2020 10 22.173214 23 40 35.130 -05 27 19.48 25.7r 20UT74 W84 C~7XOR 2021 09 09.073508 23 47 50.788 -04 37 23.22 25.6r 20UT74 W84 C~7XOR 2021 09 09.192572 23 47 50.256 -04 37 27.26 25.6r 20UT74 W84 C~7XOR 2021 10 06.002765 23 45 59.580 -04 48 53.62 25.5r 20UT74 W84 C~7XOR 2021 10 06.167954 23 45 58.929 -04 48 57.69 25.5r 20UT74 W84 C~7XOR
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 0.01
2 0.0005 -9.32 -0.03 0.61 0.03
3 0.0055 -106.90 -0.07 6.20 -0.03
4 0.0059 -115.78 0.11 6.82 -0.02
5 0.8873 7051.28 0.43 163.17 0.41
6 0.8876 7042.36 -0.42 162.64 -0.18
7 0.9610 5249.80 -0.08 193.70 0.03
8 0.9614 5239.25 0.08 193.85 -0.23
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.
20UT74 quality flag:1 Type: CLASSICAL CENTAURR CLASSICAL axisobj 47.448 69.755 46.504 ecceobj 0.142 0.578 0.038 incobj 4.288 4.295 4.286 qmin 39.517 28.833 44.036 qmax 55.539 119.823 48.894 amean 47.261 71.358 46.349 amin 46.840 66.757 45.988 amax 47.755 74.662 46.725 emean 0.146 0.587 0.034 emin 0.131 0.562 0.022 emax 0.163 0.605 0.047 imean 3.737 4.227 3.681 imin 3.243 3.933 3.348 imax 4.248 5.250 4.014 excite_mean 0.160 0.592 0.073 fracstop 1.000 0.033 1.000 cjmean 3.110 2.905 3.124 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 171.1 87.5 174.2 kozaiamp 180.0 48.2 180.0