Orbit Fit and Astrometric record for 21RE237

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: 21RE237   
# 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:
   0.000008   0.026903   0.000001  -0.000832   0.025705   0.000000
# Chi-squared of fit:     1.91 DOF:     10 RMS:  0.09
# Min/Max residuals:    -0.20    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.644738E-05  2.686216E-02 -7.074641E-07 -8.309840E-04  2.557820E-02 -1.287129E-04
# Covariance matrix:
  7.2913E-13 -1.7097E-12 -6.8136E-15  4.4304E-14 -1.1578E-12 -2.5033E-11
 -1.7097E-12  5.2282E-11  2.3429E-13 -1.6113E-12  5.4974E-11  9.1035E-10
 -6.8136E-15  2.3429E-13  6.2547E-13 -3.4201E-13  2.4487E-13  4.1083E-12
  4.4304E-14 -1.6113E-12 -3.4201E-13  3.0421E-13 -1.6951E-12 -2.8218E-11
 -1.1578E-12  5.4974E-11  2.4487E-13 -1.6951E-12  5.9360E-11  9.5770E-10
 -2.5033E-11  9.1035E-10  4.1083E-12 -2.8218E-11  9.5770E-10  1.5943E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.356398   -9.448968    0.258223   -0.022973   -0.970454  2458724.712719
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          356.50291 +/-     1.899
Argument of Peri:      221.12773 +/-     2.450
Long of Asc Node:      133.55357 +/-     0.017
Inclination:             2.21796 +/-     0.001
Eccentricity:         0.12240698 +/-    0.0007
Semi-Major Axis:     45.64494401 +/-    0.0361
Time of Perihelion: 2459814.6890 +/-     594.2
Perihelion:          40.05768414 +/-    0.0466
Aphelion:            51.23220388 +/-    0.0530
Period (y)              308.3878 +/-      0.37
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           39.47255952 +/-    0.0116
Ecliptic Y           -6.83757131 +/-    0.0019
Ecliptic Z           -0.92547931 +/-    0.0003
Ecliptic XDOT         0.00046483 +/-    0.0000
Ecliptic YDOT         0.00283945 +/-    0.0000
Ecliptic ZDOT        -0.00008882 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.07108494 +/-    0.0114
Geocenter to KBO     39.09579670 +/-    0.0118
# Hcoef:  8.82

The following table shows the complete astrometric record for 21RE237. 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 (21RE237) followed by the observatory code and reference code for the source of the astrometry.

2019 08  29.211918 23 27 24.886  -04 59 28.27  24.6r 21RE237   W84  C~7XPn      
2019 08  29.387113 23 27 24.100  -04 59 33.43  24.6r 21RE237   W84  C~7XPn      
2020 10  17.010669 23 29 33.254  -04 48 57.34  24.6r 21RE237   W84  C~7XPn      
2020 10  17.174574 23 29 32.630  -04 49 01.12  24.6r 21RE237   W84  C~7XPn      
2021 09  05.096099 23 38 23.517  -03 55 05.95  24.9r 21RE237   W84  C~7XPn      
2021 09  05.195929 23 38 23.041  -03 55 09.19  24.9r 21RE237   W84  C~7XPn      
2021 10  07.004805 23 35 59.556  -04 10 42.42  24.9r 21RE237   W84  C~7XPn      
2021 10  07.169933 23 35 58.843  -04 10 47.06  24.9r 21RE237   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     0.03       0.00     0.04
     2   0.0005    -12.83    -0.03      -0.12     0.02
     3   1.1357   2011.89    -0.01    -176.52    -0.07
     4   1.1361   2001.83     0.00    -176.31    -0.06
     5   2.0202  10583.17     0.19    -350.11     0.11
     6   2.0205  10575.33    -0.20    -350.26     0.00
     7   2.1076   8229.48     0.04    -354.49     0.07
     8   2.1080   8217.83    -0.03    -354.52    -0.11

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.

21RE237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.692    45.731    45.657
ecceobj         0.124     0.125     0.124
incobj          2.215     2.215     2.216
qmin           39.209    39.210    39.180
qmax           52.188    52.275    52.190
amean          45.554    45.590    45.522
amin           45.173    45.214    45.136
amax           45.979    46.019    45.942
emean           0.122     0.123     0.122
emin            0.108     0.109     0.107
emax            0.136     0.137     0.136
imean           1.676     1.670     1.686
imin            1.002     1.001     1.002
imax            2.220     2.212     2.258
excite_mean     0.126     0.126     0.126
fracstop        1.000     1.000     1.000
cjmean          3.101     3.101     3.101

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       175.5     176.2     175.8
kozaiamp        179.9     180.0     180.0