Orbit Fit and Astrometric record for 21RS237

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: 21RS237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.10y
# First observation: 2019/08/28
#  Last observation: 2021/10/03
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.023265   0.000001  -0.000507   0.024083   0.000000
# Chi-squared of fit:     0.78 DOF:     14 RMS:  0.05
# Min/Max residuals:    -0.09    0.08
# Exact a, adot, b, bdot, g, gdot:
  1.523110E-05  2.323508E-02 -3.566880E-07 -5.059733E-04  2.400876E-02  7.682141E-05
# Covariance matrix:
  7.2758E-13 -1.9819E-12 -6.1231E-15  3.7862E-14 -1.5106E-12 -3.4801E-11
 -1.9819E-12  9.8014E-11  3.5406E-13 -2.2018E-12  1.0633E-10  2.0259E-09
 -6.1231E-15  3.5406E-13  6.2649E-13 -3.3564E-13  3.8447E-13  7.3358E-12
  3.7862E-14 -2.2018E-12 -3.3564E-13  2.7404E-13 -2.3917E-12 -4.5617E-11
 -1.5106E-12  1.0633E-10  3.8447E-13 -2.3917E-12  1.1673E-10  2.2007E-09
 -3.4801E-11  2.0259E-09  7.3358E-12 -4.5617E-11  2.2007E-09  4.1972E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.082279   -8.284780    0.294273   -0.001376   -0.960551  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          357.25620 +/-    38.232
Argument of Peri:      186.48137 +/-    39.241
Long of Asc Node:      167.63509 +/-     0.005
Inclination:             1.25440 +/-     0.001
Eccentricity:         0.01298081 +/-    0.0008
Semi-Major Axis:     43.17669970 +/-    0.0361
Time of Perihelion: 2459510.3106 +/-   11005.3
Perihelion:          42.61623099 +/-    0.0499
Aphelion:            43.73716842 +/-    0.0506
Period (y)              283.7150 +/-      0.36
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.12770945 +/-    0.0185
Ecliptic Y           -6.43827764 +/-    0.0027
Ecliptic Z           -0.05982605 +/-    0.0000
Ecliptic XDOT         0.00039884 +/-    0.0000
Ecliptic YDOT         0.00262129 +/-    0.0000
Ecliptic ZDOT        -0.00005794 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.61688517 +/-    0.0183
Geocenter to KBO     41.65146957 +/-    0.0187
# Hcoef:  7.98

The following table shows the complete astrometric record for 21RS237. 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 (21RS237) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 29 41.519  -03 21 41.18  24.2r 21RS237   W84  C~7XPo      
2019 08  28.388381 23 29 40.769  -03 21 45.99  24.2r 21RS237   W84  C~7XPo      
2020 10  21.004397 23 30 53.246  -03 16 09.31  24.3r 21RS237   W84  C~7XPo      
2020 10  21.174149 23 30 52.662  -03 16 12.88  24.3r 21RS237   W84  C~7XPo      
2021 09  04.092679 23 39 05.204  -02 24 57.73  24.1r 21RS237   W84  C~7XPo      
2021 09  04.195842 23 39 04.750  -02 25 00.74  24.1r 21RS237   W84  C~7XPo      
2021 09  06.108763 23 38 56.590  -02 25 54.07  24.1r 21RS237   W84  C~7XPo      
2021 09  06.196686 23 38 56.199  -02 25 56.62  24.1r 21RS237   W84  C~7XPo      
2021 10  03.011907 23 37 00.126  -02 38 34.58  24.2r 21RS237   W84  C~7XPo      
2021 10  03.165173 23 36 59.474  -02 38 38.73  24.2r 21RS237   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     0.00
     2   0.0005    -12.22    -0.02       0.01    -0.01
     3   1.1493   1117.93    -0.05    -118.71    -0.06
     4   1.1498   1108.49     0.05    -118.54     0.06
     5   2.0202   9107.95     0.08    -212.03     0.02
     6   2.0205   9100.50    -0.09    -212.10    -0.05
     7   2.0257   8966.83     0.08    -212.61     0.06
     8   2.0260   8960.42    -0.06    -212.63     0.04
     9   2.0994   7060.20     0.00    -219.78    -0.04
    10   2.0998   7049.58    -0.01    -219.72    -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.

21RS237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.229    43.287    43.196
ecceobj         0.016     0.028     0.017
incobj          1.246     1.246     1.245
qmin           41.335    40.680    41.516
qmax           45.033    45.874    44.809
amean          43.116    43.173    43.084
amin           42.784    42.833    42.756
amax           43.449    43.526    43.418
emean           0.021     0.037     0.018
emin            0.000     0.017     0.000
emax            0.037     0.054     0.033
imean           2.352     2.319     2.386
imin            1.363     1.320     1.386
imax            3.057     3.046     3.085
excite_mean     0.046     0.055     0.045
fracstop        1.000     1.000     1.000
cjmean          3.088     3.088     3.088

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       188.5     192.5     175.8
kozaiamp        180.0     180.0     179.9