Orbit Fit and Astrometric record for 21RY236

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: 21RY236   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.11y
# First observation: 2019/08/28
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000007   0.023738   0.000000  -0.000560   0.024361   0.000000
# Chi-squared of fit:     0.44 DOF:     10 RMS:  0.04
# Min/Max residuals:    -0.09    0.06
# Exact a, adot, b, bdot, g, gdot:
  1.517995E-05  2.370370E-02 -5.620232E-07 -5.591066E-04  2.426477E-02 -1.174028E-04
# Covariance matrix:
  7.2801E-13 -1.9027E-12 -6.1356E-15  3.8731E-14 -1.4350E-12 -3.2442E-11
 -1.9027E-12  7.0989E-11  2.5984E-13 -1.6835E-12  7.7705E-11  1.4111E-09
 -6.1356E-15  2.5984E-13  6.2555E-13 -3.4060E-13  2.8388E-13  5.1900E-12
  3.8731E-14 -1.6835E-12 -3.4060E-13  2.9373E-13 -1.8435E-12 -3.3609E-11
 -1.4350E-12  7.7705E-11  2.8388E-13 -1.8435E-12  8.6569E-11  1.5453E-09
 -3.2442E-11  1.4111E-09  5.1900E-12 -3.3609E-11  1.5453E-09  2.8170E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.608096   -8.932812    0.283390   -0.010225   -0.963765  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          338.52208 +/-    15.300
Argument of Peri:      226.11694 +/-    16.089
Long of Asc Node:      147.03639 +/-     0.020
Inclination:             1.48163 +/-     0.001
Eccentricity:         0.02334187 +/-    0.0031
Semi-Major Axis:     43.11395904 +/-    0.0372
Time of Perihelion: 2464889.5038 +/-    4394.5
Perihelion:          42.10759875 +/-    0.1373
Aphelion:            44.12031933 +/-    0.1378
Period (y)              283.0969 +/-      0.37
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.62082546 +/-    0.0156
Ecliptic Y           -6.83547672 +/-    0.0024
Ecliptic Z           -0.43740745 +/-    0.0002
Ecliptic XDOT         0.00041001 +/-    0.0000
Ecliptic YDOT         0.00264483 +/-    0.0000
Ecliptic ZDOT        -0.00006317 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.18066120 +/-    0.0154
Geocenter to KBO     41.21201618 +/-    0.0158
# Hcoef:  8.67

The following table shows the complete astrometric record for 21RY236. 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 (21RY236) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 28 08.123  -04 06 00.35  24.9r 21RY236   W84  C~7XPn      
2019 08  28.388381 23 28 07.361  -04 06 05.36  24.9r 21RY236   W84  C~7XPn      
2020 10  17.010669 23 29 38.545  -03 58 35.24  24.9r 21RY236   W84  C~7XPn      
2020 10  17.174574 23 29 37.940  -03 58 39.01  24.9r 21RY236   W84  C~7XPn      
2021 09  05.096099 23 37 40.253  -03 08 51.92  24.8r 21RY236   W84  C~7XPn      
2021 09  05.195929 23 37 39.814  -03 08 54.92  24.8r 21RY236   W84  C~7XPn      
2021 10  07.004805 23 35 21.748  -03 23 52.95  24.7r 21RY236   W84  C~7XPn      
2021 10  07.169933 23 35 21.059  -03 23 57.35  24.7r 21RY236   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     0.06       0.00     0.04
     2   0.0005    -12.45    -0.06      -0.11    -0.05
     3   1.1384   1418.89     0.02    -124.23     0.01
     4   1.1388   1409.09    -0.02    -124.13     0.01
     5   2.0230   9228.54     0.04    -235.81     0.05
     6   2.0232   9221.30    -0.04    -235.96    -0.09
     7   2.1103   6963.61     0.03    -241.46     0.03
     8   2.1108   6952.38    -0.03    -241.42    -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.

21RY236    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.162    43.224    43.120
ecceobj         0.027     0.036     0.025
incobj          1.476     1.476     1.476
qmin           40.741    40.236    40.946
qmax           45.554    46.173    45.276
amean          43.052    43.110    43.012
amin           42.718    42.770    42.686
amax           43.383    43.454    43.346
emean           0.034     0.045     0.028
emin            0.012     0.025     0.006
emax            0.050     0.063     0.045
imean           2.128     2.105     2.158
imin            1.033     1.029     1.034
imax            2.836     2.838     2.882
excite_mean     0.050     0.059     0.047
fracstop        1.000     1.000     1.000
cjmean          3.087     3.087     3.087

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       189.0     190.7     183.6
kozaiamp        179.9     180.0     179.9