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: 21RW236
# Created Mon Apr 28 01:11:27 2025
# Orbit generated from Bernstein formalism
# Fitting 8 observations of 8
# Arc: 2.01y
# First observation: 2019/09/29
# Last observation: 2021/10/03
Preliminary a, adot, b, bdot, g, gdot:
-0.000010 0.019624 0.000003 -0.001495 0.022019 0.000000
# Chi-squared of fit: 1.40 DOF: 10 RMS: 0.07
# Min/Max residuals: -0.19 0.19
# Exact a, adot, b, bdot, g, gdot:
1.437801E-05 1.952913E-02 -8.812014E-07 -1.486556E-03 2.176450E-02 -2.510923E-03
# Covariance matrix:
7.2974E-13 -1.2397E-12 -1.1173E-14 6.8069E-14 -8.4166E-13 -2.2220E-11
-1.2397E-12 1.1349E-11 1.4488E-13 -8.8224E-13 1.5604E-11 2.8811E-10
-1.1173E-14 1.4488E-13 6.1764E-13 -3.5733E-13 2.0942E-13 3.7830E-12
6.8069E-14 -8.8224E-13 -3.5733E-13 3.4653E-13 -1.2749E-12 -2.3035E-11
-8.4166E-13 1.5604E-11 2.0942E-13 -1.2749E-12 2.6170E-11 4.1643E-10
-2.2220E-11 2.8811E-10 3.7830E-12 -2.3035E-11 4.1643E-10 7.5227E-09
# lat0 lon0 xBary yBary zBary JD0
0.105096 -8.916287 -0.253233 0.001789 -0.967161 2458755.514497
# Heliocentric elements and errors
Epoch: 2458750.5000 = 2019/09/24
Mean Anomaly: 266.82567 +/- 0.968
Argument of Peri: 285.33457 +/- 0.762
Long of Asc Node: 172.73616 +/- 0.000
Inclination: 4.35395 +/- 0.002
Eccentricity: 0.12035674 +/- 0.0040
Semi-Major Axis: 45.96242925 +/- 0.0737
Time of Perihelion: 2488208.0528 +/- 297.6
Perihelion: 40.43054095 +/- 0.1970
Aphelion: 51.49431754 +/- 0.2035
Period (y) 311.6109 +/- 0.75
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 46.38891878 +/- 0.0107
Ecliptic Y -7.02792900 +/- 0.0017
Ecliptic Z 0.08422145 +/- 0.0000
Ecliptic XDOT 0.00007755 +/- 0.0000
Ecliptic YDOT 0.00247679 +/- 0.0000
Ecliptic ZDOT -0.00018781 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 46.91834039 +/- 0.0106
Geocenter to KBO 45.94638612 +/- 0.0108
# Hcoef: 7.35
The following table shows the complete astrometric record for 21RW236. 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 (21RW236) followed by the observatory code and reference code for the source of the astrometry.
2019 09 29.013696 23 27 04.222 -03 26 16.91 24.0r 21RW236 W84 C~7XPn 2019 09 29.177510 23 27 03.581 -03 26 21.02 24.0r 21RW236 W84 C~7XPn 2020 10 17.010669 23 30 12.448 -03 12 00.59 24.0r 21RW236 W84 C~7XPn 2020 10 17.174574 23 30 11.897 -03 12 04.29 24.0r 21RW236 W84 C~7XPn 2021 09 04.092679 23 37 15.733 -02 31 29.77 23.8r 21RW236 W84 C~7XPn 2021 09 04.195842 23 37 15.301 -02 31 32.69 23.8r 21RW236 W84 C~7XPn 2021 10 03.011907 23 35 20.866 -02 44 17.77 24.0r 21RW236 W84 C~7XPn 2021 10 03.165173 23 35 20.268 -02 44 21.69 24.0r 21RW236 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 -0.04
2 0.0004 -10.44 0.04 0.00 0.05
3 1.0513 2928.22 0.02 -323.67 0.03
4 1.0518 2919.18 -0.02 -323.81 -0.04
5 1.9331 9721.02 0.19 -596.72 0.03
6 1.9334 9713.91 -0.19 -596.83 -0.03
7 2.0123 7832.99 0.01 -620.99 -0.00
8 2.0127 7823.20 -0.01 -621.05 0.01
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.
21RW236 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 46.078 46.271 45.899 ecceobj 0.124 0.134 0.114 incobj 4.338 4.338 4.339 qmin 39.292 38.954 39.619 qmax 52.883 53.609 52.265 amean 45.926 46.115 45.750 amin 45.531 45.731 45.378 amax 46.354 46.557 46.177 emean 0.128 0.138 0.118 emin 0.115 0.125 0.104 emax 0.141 0.152 0.132 imean 4.406 4.412 4.400 imin 3.903 3.903 3.902 imax 4.898 4.908 4.891 excite_mean 0.149 0.158 0.140 fracstop 1.000 1.000 1.000 cjmean 3.098 3.097 3.099 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 182.8 183.1 182.0 kozaiamp 180.0 180.0 179.9