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: 21RX236 # Created Mon Apr 28 01:11:27 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 2.10y # First observation: 2019/08/28 # Last observation: 2021/10/04 Preliminary a, adot, b, bdot, g, gdot: 0.000004 0.022043 0.000000 0.000203 0.023263 0.000000 # Chi-squared of fit: 1.75 DOF: 10 RMS: 0.08 # Min/Max residuals: -0.18 0.18 # Exact a, adot, b, bdot, g, gdot: 1.475321E-05 2.209430E-02 4.288662E-07 2.032074E-04 2.328542E-02 1.754462E-03 # Covariance matrix: 7.2739E-13 -2.0433E-12 2.7261E-15 -1.6467E-14 -1.5991E-12 -3.8188E-11 -2.0433E-12 1.2982E-10 -2.0438E-13 1.2134E-12 1.4398E-10 2.8076E-09 2.7261E-15 -2.0438E-13 6.2825E-13 -3.3846E-13 -2.2700E-13 -4.4296E-12 -1.6467E-14 1.2134E-12 -3.3846E-13 2.6683E-13 1.3467E-12 2.6303E-11 -1.5991E-12 1.4398E-10 -2.2700E-13 1.3467E-12 1.6116E-10 3.1155E-09 -3.8188E-11 2.8076E-09 -4.4296E-12 2.6303E-11 3.1155E-09 6.0861E-08 # lat0 lon0 xBary yBary zBary JD0 -0.168174 -7.649209 0.304909 -0.002806 -0.957225 2458723.711696 # Heliocentric elements and errors Epoch: 2458720.5000 = 2019/08/25 Mean Anomaly: 78.43049 +/- 0.451 Argument of Peri: 255.37922 +/- 0.763 Long of Asc Node: 9.48142 +/- 0.038 Inclination: 0.54579 +/- 0.001 Eccentricity: 0.07580245 +/- 0.0111 Semi-Major Axis: 44.33148747 +/- 0.0337 Time of Perihelion: 2435232.3233 +/- 132.3 Perihelion: 40.97105201 +/- 0.4920 Aphelion: 47.69192293 +/- 0.4923 Period (y) 295.1730 +/- 0.34 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 43.47394754 +/- 0.0232 Ecliptic Y -6.15291168 +/- 0.0031 Ecliptic Z -0.12603183 +/- 0.0001 Ecliptic XDOT 0.00055877 +/- 0.0000 Ecliptic YDOT 0.00254778 +/- 0.0000 Ecliptic ZDOT 0.00002306 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.90738344 +/- 0.0230 Geocenter to KBO 42.94533029 +/- 0.0234 # Hcoef: 8.56
The following table shows the complete astrometric record for 21RX236. 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 (21RX236) followed by the observatory code and reference code for the source of the astrometry.
2019 08 28.210895 23 32 10.056 -03 11 22.49 24.9r 21RX236 W84 C~7XPn 2019 08 28.388381 23 32 09.319 -03 11 27.00 24.9r 21RX236 W84 C~7XPn 2020 10 21.004397 23 33 08.258 -03 04 13.50 24.8r 21RX236 W84 C~7XPn 2020 10 21.174149 23 33 07.675 -03 04 17.15 24.8r 21RX236 W84 C~7XPn 2021 09 06.108763 23 40 47.604 -02 14 10.04 25.0r 21RX236 W84 C~7XPn 2021 09 06.196686 23 40 47.225 -02 14 12.68 25.0r 21RX236 W84 C~7XPn 2021 10 04.002582 23 38 50.227 -02 26 45.65 24.9r 21RX236 W84 C~7XPn 2021 10 04.175328 23 38 49.511 -02 26 49.91 24.9r 21RX236 W84 C~7XPn
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 -0.06
2 0.0005 -11.92 -0.05 0.21 0.07
3 1.1493 970.30 0.05 49.82 -0.01
4 1.1498 960.83 -0.05 49.92 -0.03
5 2.0257 8484.51 0.10 83.77 0.18
6 2.0260 8478.24 -0.10 83.60 -0.04
7 2.1021 6567.36 -0.01 87.24 -0.18
8 2.1026 6555.81 0.01 87.58 0.06
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.
21RX236 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.360 44.531 44.252 ecceobj 0.072 0.099 0.046 incobj 0.551 0.551 0.551 qmin 40.448 39.452 41.480 qmax 48.246 49.667 47.043 amean 44.247 44.419 44.136 amin 43.894 44.062 43.795 amax 44.612 44.807 44.502 emean 0.066 0.092 0.041 emin 0.050 0.076 0.025 emax 0.082 0.109 0.057 imean 1.906 1.961 1.866 imin 1.180 1.197 1.163 imax 2.501 2.552 2.433 excite_mean 0.075 0.099 0.053 fracstop 1.000 1.000 1.000 cjmean 3.098 3.095 3.100 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 173.9 172.8 174.4 kozaiamp 180.0 179.9 179.9