Orbit Fit and Astrometric record for 21RX236

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 Tue Apr  1 01:11:26 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