Orbit Fit and Astrometric record for 21RB237

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: 21RB237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.11y
# First observation: 2019/08/29
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000006   0.022878   0.000000  -0.000657   0.023948   0.000000
# Chi-squared of fit:     7.65 DOF:     10 RMS:  0.17
# Min/Max residuals:    -0.35    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.476571E-05  2.282490E-02 -1.023143E-06 -6.557879E-04  2.382993E-02 -6.275970E-04
# Covariance matrix:
  7.2772E-13 -1.9073E-12 -7.2707E-15  4.7236E-14 -1.4680E-12 -3.3775E-11
 -1.9073E-12  7.0075E-11  2.9842E-13 -2.0254E-12  7.8081E-11  1.4483E-09
 -7.2707E-15  2.9842E-13  6.2550E-13 -3.4332E-13  3.3139E-13  6.1997E-12
  4.7236E-14 -2.0254E-12 -3.4332E-13  3.1289E-13 -2.2581E-12 -4.2041E-11
 -1.4680E-12  7.8081E-11  3.3139E-13 -2.2581E-12  8.8561E-11  1.6148E-09
 -3.3775E-11  1.4483E-09  6.1997E-12 -4.2041E-11  1.6148E-09  3.0064E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.155637   -9.274664    0.261175   -0.019557   -0.969739  2458724.712719
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          273.16257 +/-     1.462
Argument of Peri:      304.68405 +/-     0.768
Long of Asc Node:      136.02497 +/-     0.021
Inclination:             2.00151 +/-     0.001
Eccentricity:         0.03056091 +/-    0.0076
Semi-Major Axis:     42.97125074 +/-    0.0517
Time of Perihelion: 2483538.6764 +/-     415.3
Perihelion:          41.65801001 +/-    0.3306
Aphelion:            44.28449147 +/-    0.3311
Period (y)              281.6924 +/-      0.51
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.32503069 +/-    0.0164
Ecliptic Y           -7.18293199 +/-    0.0027
Ecliptic Z           -0.84638554 +/-    0.0003
Ecliptic XDOT         0.00035846 +/-    0.0000
Ecliptic YDOT         0.00260054 +/-    0.0000
Ecliptic ZDOT        -0.00007410 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.93855032 +/-    0.0161
Geocenter to KBO     41.96404055 +/-    0.0166
# Hcoef:  9.22

The following table shows the complete astrometric record for 21RB237. 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 (21RB237) followed by the observatory code and reference code for the source of the astrometry.

2019 08  29.211918 23 27 44.419  -04 44 16.85  25.3r 21RB237   W84  C~7XPn      
2019 08  29.387113 23 27 43.673  -04 44 21.94  25.3r 21RB237   W84  C~7XPn      
2020 10  17.010669 23 29 11.670  -04 37 29.37  25.4r 21RB237   W84  C~7XPn      
2020 10  17.174574 23 29 11.072  -04 37 33.06  25.4r 21RB237   W84  C~7XPn      
2021 09  05.096099 23 37 00.883  -03 49 35.08  25.5r 21RB237   W84  C~7XPn      
2021 09  05.195929 23 37 00.436  -03 49 38.65  25.5r 21RB237   W84  C~7XPn      
2021 10  07.004805 23 34 44.218  -04 04 22.08  25.6r 21RB237   W84  C~7XPn      
2021 10  07.169933 23 34 43.573  -04 04 26.45  25.6r 21RB237   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     0.08       0.00     0.12
     2   0.0005    -12.26    -0.08      -0.29    -0.10
     3   1.1357   1359.43     0.04    -139.66    -0.00
     4   1.1361   1349.76    -0.04    -139.52    -0.04
     5   2.0202   8948.51     0.25    -276.60     0.25
     6   2.0205   8940.94    -0.25    -277.22    -0.35
     7   2.1076   6716.10    -0.19    -280.22     0.21
     8   2.1080   6705.49     0.20    -280.41    -0.10

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.

21RB237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.028    43.133    42.949
ecceobj         0.035     0.053     0.018
incobj          1.998     1.998     1.998
qmin           39.936    39.219    40.651
qmax           46.090    47.044    45.186
amean          42.916    43.017    42.841
amin           42.585    42.679    42.515
amax           43.259    43.382    43.170
emean           0.046     0.064     0.030
emin            0.026     0.044     0.009
emax            0.066     0.085     0.047
imean           2.091     2.087     2.103
imin            0.939     0.904     0.943
imax            2.949     3.000     2.928
excite_mean     0.059     0.074     0.047
fracstop        1.000     1.000     1.000
cjmean          3.084     3.083     3.085

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       183.3     183.6     182.5
kozaiamp        180.0     180.0     179.9