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: 21RH237 # Created Tue Apr 1 01:11:26 2025 # Orbit generated from Bernstein formalism # Fitting 9 observations of 10 # Arc: 2.10y # First observation: 2019/08/30 # Last observation: 2021/10/06 Preliminary a, adot, b, bdot, g, gdot: 0.000006 0.020204 0.000000 -0.000516 0.022237 0.000000 # Chi-squared of fit: 5.06 DOF: 12 RMS: 0.13 # Min/Max residuals: -0.33 0.36 # Exact a, adot, b, bdot, g, gdot: 1.421704E-05 2.022289E-02 -3.361955E-07 -5.165725E-04 2.221865E-02 9.010926E-04 # Covariance matrix: 7.2674E-13 -2.0470E-12 -6.6081E-15 4.5837E-14 -1.6890E-12 -4.1688E-11 -2.0470E-12 8.7187E-11 3.0270E-13 -2.2654E-12 1.0043E-10 2.0652E-09 -6.6081E-15 3.0270E-13 6.2435E-13 -3.3799E-13 3.4696E-13 7.1979E-12 4.5837E-14 -2.2654E-12 -3.3799E-13 2.9612E-13 -2.6119E-12 -5.3821E-11 -1.6890E-12 1.0043E-10 3.4696E-13 -2.6119E-12 1.1725E-10 2.3816E-09 -4.1688E-11 2.0652E-09 7.1979E-12 -5.3821E-11 2.3816E-09 4.9065E-08 # lat0 lon0 xBary yBary zBary JD0 -1.853279 -8.112992 0.264344 -0.031329 -0.968428 2458725.713221 # Heliocentric elements and errors Epoch: 2458720.5000 = 2019/08/25 Mean Anomaly: 124.00781 +/- 6.943 Argument of Peri: 102.14167 +/- 6.942 Long of Asc Node: 120.64391 +/- 0.028 Inclination: 2.33688 +/- 0.001 Eccentricity: 0.05202779 +/- 0.0085 Semi-Major Axis: 44.60243604 +/- 0.0094 Time of Perihelion: 2421241.9443 +/- 2098.3 Perihelion: 42.28187007 +/- 0.3772 Aphelion: 46.92300201 +/- 0.3772 Period (y) 297.8832 +/- 0.09 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 45.45826454 +/- 0.0217 Ecliptic Y -6.75376383 +/- 0.0031 Ecliptic Z -1.45555864 +/- 0.0007 Ecliptic XDOT 0.00046797 +/- 0.0000 Ecliptic YDOT 0.00245220 +/- 0.0000 Ecliptic ZDOT -0.00006744 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 45.98027612 +/- 0.0215 Geocenter to KBO 45.00724374 +/- 0.0219 # Hcoef: 8.63
The following table shows the complete astrometric record for 21RH237. 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 (21RH237) followed by the observatory code and reference code for the source of the astrometry.
2019 08 30.212420 23 33 07.724 -04 55 14.91 25.1r 21RH237 W84 C~7XPn 2019 08 30.387214 23 33 07.024 -04 55 19.50 25.1r 21RH237 W84 C~7XPn 2020 10 18.012125 23 34 12.778 -04 50 05.49 25.1r 21RH237 W84 C~7XPn 2020 10 18.176134 23 34 12.212 -04 50 08.79 25.1r 21RH237 W84 C~7XPn 2021 09 05.096099 23 41 20.767 -04 06 07.39 25.3r 21RH237 W84 C~7XPn 2021 09 05.195929 23 41 20.340 -04 06 10.35 25.3r 21RH237 W84 C~7XPn 2021 09 09.073508 23 41 04.797 -04 07 53.72 25.0r 21RH237 W84 C~7XPn 2021 09 09.192572 23 41 04.247 -04 07 57.01 25.0r 21RH237 W84 C~7XPn 2021 10 06.002765 23 39 16.033 -04 19 35.54 25.3r 21RH237 W84 C~7XPn 2021 10 06.167954 23 39 15.393 -04 19 39.38 25.3r 21RH237 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 0.04 0.00 -0.01
2 0.0005 -11.42 -0.03 -0.08 0.00
3 1.1357 1015.39 0.01 -100.28 -0.02
4 1.1361 1006.32 -0.02 -99.96 0.04
5 2.0175 7940.96 0.36 -218.20 -0.04
6 2.0178 7933.91 -0.07 -218.37 -0.17
7 2.0284 7679.07 ( 0.54) -220.70 ( -0.18)
8 2.0287 7670.20 -0.33 -220.45 0.09
9 2.1021 5905.21 -0.05 -217.92 -0.00
10 2.1025 5894.89 0.10 -217.64 0.11
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.
21RH237 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.648 44.716 44.613 ecceobj 0.047 0.067 0.041 incobj 2.337 2.338 2.337 qmin 41.614 40.926 41.806 qmax 47.600 48.485 47.362 amean 44.537 44.607 44.498 amin 44.194 44.253 44.148 amax 44.898 44.980 44.853 emean 0.047 0.064 0.042 emin 0.031 0.049 0.027 emax 0.061 0.078 0.056 imean 1.204 1.211 1.200 imin 0.645 0.640 0.631 imax 1.758 1.777 1.761 excite_mean 0.052 0.068 0.047 fracstop 1.000 1.000 1.000 cjmean 3.105 3.103 3.105 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 174.5 173.0 182.8 kozaiamp 180.0 180.0 180.0