Orbit Fit and Astrometric record for 21RN238

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: 21RN238   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.02y
# First observation: 2019/09/29
#  Last observation: 2021/10/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000006   0.024904  -0.000001   0.000412   0.025145   0.000000
# Chi-squared of fit:     1.21 DOF:     10 RMS:  0.07
# Min/Max residuals:    -0.13    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.590579E-05  2.485817E-02  4.481154E-07  4.111703E-04  2.488782E-02 -9.110671E-04
# Covariance matrix:
  7.3132E-13 -1.2349E-12  2.5883E-15 -1.4775E-14 -7.5214E-13 -1.7419E-11
 -1.2349E-12  1.1591E-11 -3.7435E-14  1.9711E-13  1.5068E-11  2.3136E-10
  2.5883E-15 -3.7435E-14  6.1656E-13 -3.4610E-13 -5.3253E-14 -7.7142E-13
 -1.4775E-14  1.9711E-13 -3.4610E-13  2.7897E-13  2.6938E-13  4.0423E-12
 -7.5214E-13  1.5068E-11 -5.3253E-14  2.6938E-13  2.4219E-11  3.1544E-10
 -1.7419E-11  2.3136E-10 -7.7142E-13  4.0423E-12  3.1544E-10  4.7433E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.727888   -8.878584   -0.252596   -0.012274   -0.967251  2458755.514497
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:          328.96007 +/-     2.195
Argument of Peri:      357.38301 +/-     2.485
Long of Asc Node:       28.29316 +/-     0.034
Inclination:             1.18551 +/-     0.001
Eccentricity:         0.05117443 +/-    0.0019
Semi-Major Axis:     43.00647399 +/-    0.0326
Time of Perihelion: 2467632.6369 +/-     628.1
Perihelion:          40.80564234 +/-    0.0877
Aphelion:            45.20730565 +/-    0.0890
Period (y)              282.0389 +/-      0.32
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.69346535 +/-    0.0079
Ecliptic Y           -6.10764625 +/-    0.0012
Ecliptic Z           -0.51043663 +/-    0.0001
Ecliptic XDOT         0.00033210 +/-    0.0000
Ecliptic YDOT         0.00271812 +/-    0.0000
Ecliptic ZDOT         0.00004627 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.15242411 +/-    0.0078
Geocenter to KBO     40.18029570 +/-    0.0079
# Hcoef:  8.66

The following table shows the complete astrometric record for 21RN238. 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 (21RN238) followed by the observatory code and reference code for the source of the astrometry.

2019 09  29.013696 23 28 31.473  -04 11 19.80  24.7r 21RN238   W84  C~7XPp      
2019 09  29.177510 23 28 30.745  -04 11 24.22  24.7r 21RN238   W84  C~7XPp      
2020 10  18.012125 23 32 23.881  -03 44 39.41  24.8r 21RN238   W84  C~7XPp      
2020 10  18.176134 23 32 23.250  -03 44 42.98  24.8r 21RN238   W84  C~7XPp      
2021 09  06.108763 23 40 39.373  -02 50 08.41  24.6r 21RN238   W84  C~7XPp      
2021 09  06.196686 23 40 38.972  -02 50 10.71  24.6r 21RN238   W84  C~7XPp      
2021 10  04.002582 23 38 34.502  -03 03 26.01  24.7r 21RN238   W84  C~7XPp      
2021 10  04.175328 23 38 33.747  -03 03 30.62  24.7r 21RN238   W84  C~7XPp      

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    -0.02       0.00    -0.04
     2   0.0004    -11.75     0.02       0.23     0.04
     3   1.0541   3827.51     0.07      98.17    -0.12
     4   1.0545   3817.41    -0.07      98.62     0.12
     5   1.9387  11949.20    -0.01     162.39    -0.13
     6   1.9389  11942.75     0.01     162.66     0.10
     7   2.0150   9909.96    -0.03     172.55    -0.02
     8   2.0155   9897.73     0.03     172.81     0.06

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.

21RN238    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.058    43.127    42.990
ecceobj         0.055     0.059     0.052
incobj          1.188     1.188     1.187
qmin           39.271    39.150    39.350
qmax           46.837    47.092    46.638
amean          42.942    43.010    42.877
amin           42.610    42.665    42.548
amax           43.299    43.364    43.235
emean           0.062     0.066     0.059
emin            0.038     0.043     0.035
emax            0.082     0.086     0.079
imean           1.650     1.618     1.680
imin            0.214     0.209     0.206
imax            2.500     2.481     2.526
excite_mean     0.069     0.073     0.066
fracstop        1.000     1.000     1.000
cjmean          3.083     3.083     3.083

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       187.0     185.1     188.9
kozaiamp        180.0     180.0     180.0