Orbit Fit and Astrometric record for 21RW236

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: 21RW236   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.01y
# First observation: 2019/09/29
#  Last observation: 2021/10/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000010   0.019624   0.000003  -0.001495   0.022019   0.000000
# Chi-squared of fit:     1.40 DOF:     10 RMS:  0.07
# Min/Max residuals:    -0.19    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.437801E-05  1.952913E-02 -8.812014E-07 -1.486556E-03  2.176450E-02 -2.510923E-03
# Covariance matrix:
  7.2974E-13 -1.2397E-12 -1.1173E-14  6.8069E-14 -8.4166E-13 -2.2220E-11
 -1.2397E-12  1.1349E-11  1.4488E-13 -8.8224E-13  1.5604E-11  2.8811E-10
 -1.1173E-14  1.4488E-13  6.1764E-13 -3.5733E-13  2.0942E-13  3.7830E-12
  6.8069E-14 -8.8224E-13 -3.5733E-13  3.4653E-13 -1.2749E-12 -2.3035E-11
 -8.4166E-13  1.5604E-11  2.0942E-13 -1.2749E-12  2.6170E-11  4.1643E-10
 -2.2220E-11  2.8811E-10  3.7830E-12 -2.3035E-11  4.1643E-10  7.5227E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.105096   -8.916287   -0.253233    0.001789   -0.967161  2458755.514497
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:          266.82567 +/-     0.968
Argument of Peri:      285.33457 +/-     0.762
Long of Asc Node:      172.73616 +/-     0.000
Inclination:             4.35395 +/-     0.002
Eccentricity:         0.12035674 +/-    0.0040
Semi-Major Axis:     45.96242925 +/-    0.0737
Time of Perihelion: 2488208.0528 +/-     297.6
Perihelion:          40.43054095 +/-    0.1970
Aphelion:            51.49431754 +/-    0.2035
Period (y)              311.6109 +/-      0.75
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           46.38891878 +/-    0.0107
Ecliptic Y           -7.02792900 +/-    0.0017
Ecliptic Z            0.08422145 +/-    0.0000
Ecliptic XDOT         0.00007755 +/-    0.0000
Ecliptic YDOT         0.00247679 +/-    0.0000
Ecliptic ZDOT        -0.00018781 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.91834039 +/-    0.0106
Geocenter to KBO     45.94638612 +/-    0.0108
# Hcoef:  7.35

The following table shows the complete astrometric record for 21RW236. 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 (21RW236) followed by the observatory code and reference code for the source of the astrometry.

2019 09  29.013696 23 27 04.222  -03 26 16.91  24.0r 21RW236   W84  C~7XPn      
2019 09  29.177510 23 27 03.581  -03 26 21.02  24.0r 21RW236   W84  C~7XPn      
2020 10  17.010669 23 30 12.448  -03 12 00.59  24.0r 21RW236   W84  C~7XPn      
2020 10  17.174574 23 30 11.897  -03 12 04.29  24.0r 21RW236   W84  C~7XPn      
2021 09  04.092679 23 37 15.733  -02 31 29.77  23.8r 21RW236   W84  C~7XPn      
2021 09  04.195842 23 37 15.301  -02 31 32.69  23.8r 21RW236   W84  C~7XPn      
2021 10  03.011907 23 35 20.866  -02 44 17.77  24.0r 21RW236   W84  C~7XPn      
2021 10  03.165173 23 35 20.268  -02 44 21.69  24.0r 21RW236   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    -0.04       0.00    -0.04
     2   0.0004    -10.44     0.04       0.00     0.05
     3   1.0513   2928.22     0.02    -323.67     0.03
     4   1.0518   2919.18    -0.02    -323.81    -0.04
     5   1.9331   9721.02     0.19    -596.72     0.03
     6   1.9334   9713.91    -0.19    -596.83    -0.03
     7   2.0123   7832.99     0.01    -620.99    -0.00
     8   2.0127   7823.20    -0.01    -621.05     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.

21RW236    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.078    46.271    45.899
ecceobj         0.124     0.134     0.114
incobj          4.338     4.338     4.339
qmin           39.292    38.954    39.619
qmax           52.883    53.609    52.265
amean          45.926    46.115    45.750
amin           45.531    45.731    45.378
amax           46.354    46.557    46.177
emean           0.128     0.138     0.118
emin            0.115     0.125     0.104
emax            0.141     0.152     0.132
imean           4.406     4.412     4.400
imin            3.903     3.903     3.902
imax            4.898     4.908     4.891
excite_mean     0.149     0.158     0.140
fracstop        1.000     1.000     1.000
cjmean          3.098     3.097     3.099

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       182.8     183.1     182.0
kozaiamp        180.0     180.0     179.9