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: 21RX237 # Created Mon Apr 28 01:11:27 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 2.02y # First observation: 2019/09/29 # Last observation: 2021/10/04 Preliminary a, adot, b, bdot, g, gdot: -0.000003 0.024934 0.000002 -0.001190 0.025178 0.000000 # Chi-squared of fit: 0.60 DOF: 10 RMS: 0.05 # Min/Max residuals: -0.10 0.10 # Exact a, adot, b, bdot, g, gdot: 1.571846E-05 2.491917E-02 -5.558147E-07 -1.188214E-03 2.496309E-02 -2.611986E-04 # Covariance matrix: 7.3102E-13 -1.2247E-12 -6.6863E-15 4.1952E-14 -7.4294E-13 -1.7194E-11 -1.2247E-12 1.0973E-11 8.1912E-14 -5.3182E-13 1.4264E-11 2.1831E-10 -6.6863E-15 8.1912E-14 6.1652E-13 -3.4930E-13 1.0970E-13 1.6725E-12 4.1952E-14 -5.3182E-13 -3.4930E-13 3.0221E-13 -7.2689E-13 -1.0884E-11 -7.4294E-13 1.4264E-11 1.0970E-13 -7.2689E-13 2.3333E-11 2.9865E-10 -1.7194E-11 2.1831E-10 1.6725E-12 -1.0884E-11 2.9865E-10 4.4683E-09 # lat0 lon0 xBary yBary zBary JD0 -0.702228 -8.966814 -0.254085 -0.011836 -0.966866 2458755.514497 # Heliocentric elements and errors Epoch: 2458750.5000 = 2019/09/24 Mean Anomaly: 358.00435 +/- 3.679 Argument of Peri: 196.26746 +/- 3.988 Long of Asc Node: 157.27176 +/- 0.007 Inclination: 2.81092 +/- 0.001 Eccentricity: 0.03984788 +/- 0.0005 Semi-Major Axis: 42.73260667 +/- 0.0259 Time of Perihelion: 2459316.1135 +/- 1042.6 Perihelion: 41.02980299 +/- 0.0324 Aphelion: 44.43541035 +/- 0.0340 Period (y) 279.3491 +/- 0.25 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 40.56442212 +/- 0.0077 Ecliptic Y -6.14992841 +/- 0.0012 Ecliptic Z -0.49099880 +/- 0.0001 Ecliptic XDOT 0.00040460 +/- 0.0000 Ecliptic YDOT 0.00270527 +/- 0.0000 Ecliptic ZDOT -0.00013019 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 41.03090349 +/- 0.0076 Geocenter to KBO 40.05913794 +/- 0.0078 # Hcoef: 8.27
The following table shows the complete astrometric record for 21RX237. 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 (21RX237) followed by the observatory code and reference code for the source of the astrometry.
2019 09 29.013696 23 28 09.527 -04 12 00.04 24.3r 21RX237 W84 C~7XPo 2019 09 29.177510 23 28 08.797 -04 12 04.66 24.3r 21RX237 W84 C~7XPo 2020 10 17.010669 23 32 15.221 -03 50 12.02 24.3r 21RX237 W84 C~7XPo 2020 10 17.174574 23 32 14.599 -03 50 15.98 24.3r 21RX237 W84 C~7XPo 2021 09 06.108763 23 40 35.367 -03 00 30.77 24.3r 21RX237 W84 C~7XPo 2021 09 06.196686 23 40 34.957 -03 00 33.32 24.3r 21RX237 W84 C~7XPo 2021 10 04.002582 23 38 30.876 -03 14 12.71 24.3r 21RX237 W84 C~7XPo 2021 10 04.175328 23 38 30.122 -03 14 17.50 24.3r 21RX237 W84 C~7XPo
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 -0.04
2 0.0004 -11.86 -0.02 0.06 0.01
3 1.0513 3894.64 0.01 -248.66 0.05
4 1.0518 3884.52 -0.01 -248.62 0.02
5 1.9387 11964.67 0.10 -478.51 -0.10
6 1.9389 11958.00 -0.09 -478.41 0.03
7 2.0150 9921.25 -0.01 -492.80 -0.01
8 2.0155 9908.95 0.01 -492.71 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.
21RX237 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.769 42.826 42.714 ecceobj 0.042 0.043 0.041 incobj 2.803 2.803 2.804 qmin 39.488 39.499 39.471 qmax 46.025 46.103 45.992 amean 42.662 42.718 42.608 amin 42.334 42.389 42.284 amax 43.011 43.061 42.955 emean 0.050 0.051 0.049 emin 0.027 0.028 0.025 emax 0.071 0.071 0.071 imean 3.476 3.455 3.493 imin 2.131 2.130 2.131 imax 4.636 4.544 4.683 excite_mean 0.079 0.079 0.078 fracstop 1.000 1.000 1.000 cjmean 3.078 3.079 3.078 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 183.2 183.7 181.9 kozaiamp 180.0 179.9 179.9