Orbit Fit and Astrometric record for 21RU236

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: 21RU236   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.10y
# First observation: 2019/08/28
#  Last observation: 2021/10/04
Preliminary a, adot, b, bdot, g, gdot:
   0.000002   0.019419   0.000000  -0.000185   0.021825   0.000000
# Chi-squared of fit:     1.74 DOF:     10 RMS:  0.08
# Min/Max residuals:    -0.14    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.357628E-05  1.939816E-02 -3.682812E-07 -1.850266E-04  2.177826E-02  4.694871E-05
# Covariance matrix:
  7.2562E-13 -2.2815E-12 -3.0920E-15  1.9532E-14 -1.9536E-12 -4.9530E-11
 -2.2815E-12  1.7921E-10  2.7237E-13 -1.7440E-12  2.0682E-10  4.4313E-09
 -3.0920E-15  2.7237E-13  6.2787E-13 -3.3889E-13  3.1427E-13  6.7466E-12
  1.9532E-14 -1.7440E-12 -3.3889E-13  2.7178E-13 -2.0133E-12 -4.3194E-11
 -1.9536E-12  2.0682E-10  3.1427E-13 -2.0133E-12  2.4013E-10  5.1158E-09
 -4.9530E-11  4.4313E-09  6.7466E-12 -4.3194E-11  5.1158E-09  1.0975E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.127494   -7.137382    0.313448   -0.002120   -0.954465  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          181.05492 +/-    16.287
Argument of Peri:       11.80048 +/-    16.308
Long of Asc Node:      159.71851 +/-     0.037
Inclination:             0.56580 +/-     0.001
Eccentricity:         0.05656589 +/-    0.0003
Semi-Major Axis:     44.36728511 +/-    0.0528
Time of Perihelion: 2512375.4714 +/-    4882.4
Perihelion:          41.85761012 +/-    0.0511
Aphelion:            46.87696009 +/-    0.0569
Period (y)              295.5306 +/-      0.53
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           46.47237117 +/-    0.0324
Ecliptic Y           -6.14175936 +/-    0.0041
Ecliptic Z           -0.10218909 +/-    0.0001
Ecliptic XDOT         0.00031726 +/-    0.0000
Ecliptic YDOT         0.00241958 +/-    0.0000
Ecliptic ZDOT        -0.00002350 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.87657126 +/-    0.0321
Geocenter to KBO     45.91735468 +/-    0.0327
# Hcoef:  7.94

The following table shows the complete astrometric record for 21RU236. 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 (21RU236) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 33 59.203  -02 57 00.07  24.7r 21RU236   W84  C~7XPn      
2019 08  28.388381 23 33 58.507  -02 57 04.56  24.7r 21RU236   W84  C~7XPn      
2020 10  21.004397 23 34 37.386  -02 53 40.41  24.5r 21RU236   W84  C~7XPn      
2020 10  21.174149 23 34 36.830  -02 53 43.84  24.5r 21RU236   W84  C~7XPn      
2021 09  06.108763 23 41 36.586  -02 09 10.33  24.6r 21RU236   W84  C~7XPn      
2021 09  06.196686 23 41 36.212  -02 09 12.52  24.6r 21RU236   W84  C~7XPn      
2021 10  04.002582 23 39 45.378  -02 21 12.66  24.4r 21RU236   W84  C~7XPn      
2021 10  04.175328 23 39 44.699  -02 21 17.03  24.4r 21RU236   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     0.10       0.00     0.05
     2   0.0005    -11.35    -0.10      -0.00     0.00
     3   1.1493    604.34     0.02     -42.70    -0.10
     4   1.1498    595.33    -0.03     -42.56    -0.02
     5   2.0257   7433.22     0.13     -78.50    -0.03
     6   2.0260   7427.20    -0.14     -78.29     0.17
     7   2.1021   5614.78     0.05     -80.84    -0.02
     8   2.1026   5603.70    -0.03     -80.82    -0.05

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.

21RU236    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.442    44.615    44.388
ecceobj         0.054     0.072     0.055
incobj          0.558     0.558     0.557
qmin           40.844    40.062    40.842
qmax           48.028    49.132    47.866
amean          44.318    44.487    44.268
amin           43.966    44.126    43.923
amax           44.689    44.867    44.628
emean           0.059     0.080     0.058
emin            0.044     0.064     0.043
emax            0.075     0.095     0.073
imean           1.675     1.620     1.708
imin            1.006     0.904     1.042
imax            2.224     2.222     2.247
excite_mean     0.066     0.085     0.066
fracstop        1.000     1.000     1.000
cjmean          3.100     3.099     3.100

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       172.5     182.4     170.0
kozaiamp        180.0     180.0     180.0