Orbit Fit and Astrometric record for 21RX237

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: 21RX237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.02y
# First observation: 2019/09/29
#  Last observation: 2021/10/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000003   0.024934   0.000002  -0.001190   0.025178   0.000000
# Chi-squared of fit:     0.60 DOF:     10 RMS:  0.05
# Min/Max residuals:    -0.10    0.10
# Exact a, adot, b, bdot, g, gdot:
  1.571846E-05  2.491917E-02 -5.558147E-07 -1.188214E-03  2.496309E-02 -2.611986E-04
# Covariance matrix:
  7.3102E-13 -1.2247E-12 -6.6863E-15  4.1952E-14 -7.4294E-13 -1.7194E-11
 -1.2247E-12  1.0973E-11  8.1912E-14 -5.3182E-13  1.4264E-11  2.1831E-10
 -6.6863E-15  8.1912E-14  6.1652E-13 -3.4930E-13  1.0970E-13  1.6725E-12
  4.1952E-14 -5.3182E-13 -3.4930E-13  3.0221E-13 -7.2689E-13 -1.0884E-11
 -7.4294E-13  1.4264E-11  1.0970E-13 -7.2689E-13  2.3333E-11  2.9865E-10
 -1.7194E-11  2.1831E-10  1.6725E-12 -1.0884E-11  2.9865E-10  4.4683E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.702228   -8.966814   -0.254085   -0.011836   -0.966866  2458755.514497
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:          358.00435 +/-     3.679
Argument of Peri:      196.26746 +/-     3.988
Long of Asc Node:      157.27176 +/-     0.007
Inclination:             2.81092 +/-     0.001
Eccentricity:         0.03984788 +/-    0.0005
Semi-Major Axis:     42.73260667 +/-    0.0259
Time of Perihelion: 2459316.1135 +/-    1042.6
Perihelion:          41.02980299 +/-    0.0324
Aphelion:            44.43541035 +/-    0.0340
Period (y)              279.3491 +/-      0.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.56442212 +/-    0.0077
Ecliptic Y           -6.14992841 +/-    0.0012
Ecliptic Z           -0.49099880 +/-    0.0001
Ecliptic XDOT         0.00040460 +/-    0.0000
Ecliptic YDOT         0.00270527 +/-    0.0000
Ecliptic ZDOT        -0.00013019 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.03090349 +/-    0.0076
Geocenter to KBO     40.05913794 +/-    0.0078
# Hcoef:  8.27

The following table shows the complete astrometric record for 21RX237. 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 (21RX237) followed by the observatory code and reference code for the source of the astrometry.

2019 09  29.013696 23 28 09.527  -04 12 00.04  24.3r 21RX237   W84  C~7XPo      
2019 09  29.177510 23 28 08.797  -04 12 04.66  24.3r 21RX237   W84  C~7XPo      
2020 10  17.010669 23 32 15.221  -03 50 12.02  24.3r 21RX237   W84  C~7XPo      
2020 10  17.174574 23 32 14.599  -03 50 15.98  24.3r 21RX237   W84  C~7XPo      
2021 09  06.108763 23 40 35.367  -03 00 30.77  24.3r 21RX237   W84  C~7XPo      
2021 09  06.196686 23 40 34.957  -03 00 33.32  24.3r 21RX237   W84  C~7XPo      
2021 10  04.002582 23 38 30.876  -03 14 12.71  24.3r 21RX237   W84  C~7XPo      
2021 10  04.175328 23 38 30.122  -03 14 17.50  24.3r 21RX237   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    -0.04
     2   0.0004    -11.86    -0.02       0.06     0.01
     3   1.0513   3894.64     0.01    -248.66     0.05
     4   1.0518   3884.52    -0.01    -248.62     0.02
     5   1.9387  11964.67     0.10    -478.51    -0.10
     6   1.9389  11958.00    -0.09    -478.41     0.03
     7   2.0150   9921.25    -0.01    -492.80    -0.01
     8   2.0155   9908.95     0.01    -492.71     0.04

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.

21RX237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.769    42.826    42.714
ecceobj         0.042     0.043     0.041
incobj          2.803     2.803     2.804
qmin           39.488    39.499    39.471
qmax           46.025    46.103    45.992
amean          42.662    42.718    42.608
amin           42.334    42.389    42.284
amax           43.011    43.061    42.955
emean           0.050     0.051     0.049
emin            0.027     0.028     0.025
emax            0.071     0.071     0.071
imean           3.476     3.455     3.493
imin            2.131     2.130     2.131
imax            4.636     4.544     4.683
excite_mean     0.079     0.079     0.078
fracstop        1.000     1.000     1.000
cjmean          3.078     3.079     3.078

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       183.2     183.7     181.9
kozaiamp        180.0     179.9     179.9