Orbit Fit and Astrometric record for 21RG237

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: 21RG237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.11y
# First observation: 2019/08/29
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000023   0.026343   0.000001  -0.000629   0.025698   0.000000
# Chi-squared of fit:     1.95 DOF:     14 RMS:  0.08
# Min/Max residuals:    -0.13    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.609076E-05  2.632481E-02 -2.125234E-07 -6.288742E-04  2.560406E-02  1.556576E-04
# Covariance matrix:
  6.4156E-13  5.2751E-13  1.7289E-15 -1.7965E-14  1.2697E-12  1.3495E-11
  5.2751E-13  4.6950E-12  1.4290E-14 -1.2171E-13  4.7559E-12  9.2169E-11
  1.7289E-15  1.4290E-14  3.5097E-13 -1.9087E-13  1.3466E-14  2.9512E-13
 -1.7965E-14 -1.2171E-13 -1.9087E-13  1.8120E-13 -1.2412E-13 -2.4924E-12
  1.2697E-12  4.7559E-12  1.3466E-14 -1.2412E-13  6.5026E-12  9.3678E-11
  1.3495E-11  9.2169E-11  2.9512E-13 -2.4924E-12  9.3678E-11  1.8882E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.832760   -8.813511    0.268973   -0.030947   -0.967307  2458724.712719
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:            1.37770 +/-     1.179
Argument of Peri:      230.74635 +/-     1.373
Long of Asc Node:      118.44798 +/-     0.019
Inclination:             2.25832 +/-     0.001
Eccentricity:         0.07400084 +/-    0.0002
Semi-Major Axis:     43.22612272 +/-    0.0118
Time of Perihelion: 2458323.2456 +/-     340.0
Perihelion:          40.02735351 +/-    0.0130
Aphelion:            46.42489192 +/-    0.0145
Period (y)              284.2023 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           39.49340689 +/-    0.0038
Ecliptic Y           -6.40216520 +/-    0.0006
Ecliptic Z           -1.24911610 +/-    0.0001
Ecliptic XDOT         0.00045407 +/-    0.0000
Ecliptic YDOT         0.00278004 +/-    0.0000
Ecliptic ZDOT        -0.00006797 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.02845486 +/-    0.0038
Geocenter to KBO     39.05631325 +/-    0.0039
# Hcoef:  8.94

The following table shows the complete astrometric record for 21RG237. 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 (21RG237) followed by the observatory code and reference code for the source of the astrometry.

2019 08  29.211918 23 30 30.795  -05 10 42.61  24.8r 21RG237   W84  C~7XPn      
2019 08  29.387113 23 30 30.004  -05 10 47.75  24.8r 21RG237   W84  C~7XPn      
2019 09  28.012277 23 28 14.618  -05 25 27.47  24.8r 21RG237   W84  C~7XPn      
2019 09  28.177548 23 28 13.869  -05 25 31.97  24.8r 21RG237   W84  C~7XPn      
2020 10  16.001792 23 32 33.169  -04 59 53.08  24.9r 21RG237   W84  C~7XPn      
2020 10  16.175804 23 32 32.470  -04 59 57.33  24.9r 21RG237   W84  C~7XPn      
2021 09  09.073508 23 40 55.070  -04 08 25.62  24.9r 21RG237   W84  C~7XPn      
2021 09  09.192572 23 40 54.518  -04 08 29.09  24.9r 21RG237   W84  C~7XPn      
2021 10  07.004805 23 38 48.126  -04 22 04.09  24.9r 21RG237   W84  C~7XPn      
2021 10  07.169933 23 38 47.394  -04 22 08.75  24.9r 21RG237   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    -12.89    -0.06      -0.06     0.02
     3   0.0816  -2218.12    -0.07     -11.26    -0.06
     4   0.0820  -2230.17     0.08     -10.99     0.09
     5   1.1329   1936.31     0.15    -125.62     0.03
     6   1.1334   1925.03    -0.13    -125.39    -0.04
     7   2.0311  10057.75    -0.01    -269.52    -0.11
     8   2.0314  10048.78     0.05    -269.41     0.01
     9   2.1076   7985.99     0.08    -265.06     0.12
    10   2.1080   7974.08    -0.13    -264.98    -0.02

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.

21RG237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.267    43.297    43.238
ecceobj         0.076     0.076     0.075
incobj          2.259     2.259     2.259
qmin           38.666    38.706    38.885
qmax           47.917    47.902    47.689
amean          43.159    43.188    43.128
amin           42.809    42.840    42.782
amax           43.528    43.556    43.509
emean           0.081     0.081     0.076
emin            0.057     0.057     0.056
emax            0.101     0.100     0.096
imean           1.966     1.952     1.885
imin            0.511     0.512     0.509
imax            3.174     3.130     2.989
excite_mean     0.089     0.088     0.084
fracstop        1.000     1.000     1.000
cjmean          3.082     3.082     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       180.1     180.6     175.1
kozaiamp        180.0     180.0     180.0