Orbit Fit and Astrometric record for 21RL237

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: 21RL237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.03y
# First observation: 2019/09/27
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
  -0.000022   0.033874  -0.000024   0.008424   0.027971   0.000000
# Chi-squared of fit:     8.20 DOF:     10 RMS:  0.18
# Min/Max residuals:    -0.34    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.876136E-05  3.364007E-02  3.671931E-06  8.357883E-03  2.736871E-02 -3.496862E-03
# Covariance matrix:
  7.2271E-13 -1.0926E-12  3.1217E-14 -1.8641E-13 -4.6439E-13 -1.0715E-11
 -1.0926E-12  7.9672E-12 -3.3462E-13  1.9732E-12  8.3217E-12  1.1339E-10
  3.1217E-14 -3.3462E-13  6.2934E-13 -4.2897E-13 -3.7557E-13 -4.9436E-12
 -1.8641E-13  1.9732E-12 -4.2897E-13  7.7879E-13  2.1915E-12  2.9129E-11
 -4.6439E-13  8.3217E-12 -3.7557E-13  2.1915E-12  1.2433E-11  1.2591E-10
 -1.0715E-11  1.1339E-10 -4.9436E-12  2.9129E-11  1.2591E-10  1.6738E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.048086  -10.665853   -0.249643   -0.034597   -0.967804  2458753.515384
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:          356.31125 +/-     0.044
Argument of Peri:        6.66703 +/-     0.179
Long of Asc Node:      357.68104 +/-     0.000
Inclination:            14.09244 +/-     0.001
Eccentricity:         0.54651810 +/-    0.0008
Semi-Major Axis:     81.73675312 +/-    0.1327
Time of Perihelion: 2461516.1731 +/-      32.3
Perihelion:          37.06613838 +/-    0.0890
Aphelion:           126.40736785 +/-    0.2154
Period (y)              738.9827 +/-      1.80
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.88489190 +/-    0.0046
Ecliptic Y           -6.69899568 +/-    0.0009
Ecliptic Z           -1.30568586 +/-    0.0002
Ecliptic XDOT         0.00031714 +/-    0.0000
Ecliptic YDOT         0.00336714 +/-    0.0000
Ecliptic ZDOT         0.00084783 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.51101983 +/-    0.0045
Geocenter to KBO     36.53807218 +/-    0.0047
# Hcoef: 10.29

The following table shows the complete astrometric record for 21RL237. 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 (21RL237) followed by the observatory code and reference code for the source of the astrometry.

2019 09  27.014583 23 24 00.881  -06 06 20.55  26.0r 21RL237   W84  C~7XPn      
2019 09  27.176040 23 24 00.094  -06 06 24.94  26.0r 21RL237   W84  C~7XPn      
2020 10  16.001792 23 28 56.155  -05 01 23.05  26.0r 21RL237   W84  C~7XPn      
2020 10  16.175804 23 28 55.459  -05 01 25.70  26.0r 21RL237   W84  C~7XPn      
2021 09  05.096099 23 38 33.162  -03 31 40.56  25.8r 21RL237   W84  C~7XPn      
2021 09  05.195929 23 38 32.678  -03 31 42.98  25.8r 21RL237   W84  C~7XPn      
2021 10  07.004805 23 35 59.565  -03 45 18.53  25.9r 21RL237   W84  C~7XPn      
2021 10  07.169933 23 35 58.781  -03 45 22.12  25.9r 21RL237   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     0.14       0.00     0.24
     2   0.0004    -12.52    -0.16       0.58    -0.16
     3   1.0540   5588.98    -0.23    1845.16    -0.34
     4   1.0545   5578.37     0.28    1846.84     0.17
     5   1.9414  15676.73    -0.03    3368.86    -0.04
     6   1.9416  15669.08     0.06    3369.52     0.12
     7   2.0287  13229.54     0.08    3531.68    -0.18
     8   2.0292  13217.30    -0.13    3533.04     0.19

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.

21RL237    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        81.987    82.215    81.764
ecceobj         0.549     0.550     0.548
incobj         14.074    14.074    14.075
qmin           35.617    35.630    35.317
qmax          128.896   130.304   129.418
amean          80.840    81.341    80.926
amin           79.425    79.875    79.502
amax           82.693    83.372    82.987
emean           0.547     0.549     0.549
emin            0.533     0.535     0.535
emax            0.560     0.563     0.564
imean          13.666    13.811    13.383
imin           12.905    12.996    12.241
imax           14.798    14.802    14.798
excite_mean     0.596     0.598     0.596
fracstop        1.000     1.000     1.000
cjmean          3.039     3.039     3.038

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       171.9     148.7     158.7
kozaiamp        179.9     180.0     180.0