Orbit Fit and Astrometric record for 20QH83

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: 20QH83    
# Created Wed Dec  8 02:14:11 2021
# Orbit generated from Bernstein formalism
# Fitting     20 observations of     21
# Arc:   1.08y
# First observation: 2020/08/16
#  Last observation: 2021/09/13
Preliminary a, adot, b, bdot, g, gdot:
   0.000074   0.029900  -0.000012   0.012248   0.029554   0.000000
# Chi-squared of fit:     5.98 DOF:     34 RMS:  0.10
# Min/Max residuals:    -0.30    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.575696E-05  2.981563E-02  6.388326E-06  1.218826E-02  2.950587E-02 -7.662980E-03
# Covariance matrix:
  2.8448E-13  6.5069E-13 -3.0162E-14  4.1275E-13  7.2668E-13  3.2391E-11
  6.5069E-13  8.0048E-12 -2.3403E-13  3.4274E-12  4.5194E-12  2.6948E-10
 -3.0162E-14 -2.3403E-13  1.3767E-13 -2.6028E-13 -1.5877E-13 -8.6088E-12
  4.1275E-13  3.4274E-12 -2.6028E-13  1.9865E-12  2.2216E-12  1.2443E-10
  7.2668E-13  4.5194E-12 -1.5877E-13  2.2216E-12  3.5819E-12  1.7445E-10
  3.2391E-11  2.6948E-10 -8.6088E-12  1.2443E-10  1.7445E-10  9.7799E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.651808  -47.681713   -0.196997   -0.062847   -0.982580  2459077.711691
# Heliocentric elements and errors
Epoch:              2459070.5000  =  2020/08/09
Mean Anomaly:          310.64482 +/-     0.140
Argument of Peri:       66.52284 +/-     0.177
Long of Asc Node:      321.27117 +/-     0.000
Inclination:            22.45117 +/-     0.001
Eccentricity:         0.25226926 +/-    0.0032
Semi-Major Axis:     39.55234782 +/-    0.0714
Time of Perihelion: 2471526.7431 +/-      10.2
Perihelion:          29.57450617 +/-    0.1367
Aphelion:            49.53018946 +/-    0.1544
Period (y)              248.7520 +/-      0.67
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           23.58570460 +/-    0.0015
Ecliptic Y          -25.61084112 +/-    0.0016
Ecliptic Z           -2.15837642 +/-    0.0001
Ecliptic XDOT         0.00162412 +/-    0.0000
Ecliptic YDOT         0.00233855 +/-    0.0000
Ecliptic ZDOT         0.00117372 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.88350947 +/-    0.0015
Geocenter to KBO     33.89155732 +/-    0.0022
# Hcoef:  7.57

The following table shows the complete astrometric record for 20QH83. 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 (20QH83) followed by the observatory code and reference code for the source of the astrometry.

2020 08  16.21089  21 03 29.78   -20 36 26.7   23.0R 20QH83    G37  C~4qof      
2020 08  16.23677  21 03 29.62   -20 36 27.2   22.6R 20QH83    G37  C~4qof      
2020 08  16.27702  21 03 29.38   -20 36 27.8   22.0R 20QH83    G37  C~4qof      
2020 08  16.29120  21 03 29.29   -20 36 28.0   22.3R 20QH83    G37  C~4qof      
2020 08  16.31867  21 03 29.13   -20 36 28.5   22.6R 20QH83    G37  C~4qof      
2020 09  20.11116  21 00 30.82   -20 42 48.1   22.2R 20QH83    G37  C~4qof      
2020 09  20.14420  21 00 30.69   -20 42 48.2   22.7R 20QH83    G37  C~4qof      
2020 09  20.16523  21 00 30.60   -20 42 48.3   23.3R 20QH83    G37  C~4qof      
2020 09  20.17927  21 00 30.54   -20 42 48.3   22.6R 20QH83    G37  C~4qof      
2020 09  20.19324  21 00 30.49   -20 42 48.4   22.9R 20QH83    G37  C~4qof      
2020 09  24.15293  21 00 15.62   -20 43 01.3         20QH83    G37  C~4qof      
2020 09  24.16003  21 00 15.58   -20 43 01.8         20QH83    G37  C~4qof      
2020 09  24.16672  21 00 15.56   -20 43 01.9         20QH83    G37  C~4qof      
2020 09  24.19183  21 00 15.46   -20 43 02.2         20QH83    G37  C~4qof      
2021 07  08.38678  21 13 24.49   -19 13 44.2   22.8R 20QH83    G37  C~4v6j      
2021 07  08.42792  21 13 24.29   -19 13 45.1   22.7R 20QH83    G37  C~4v6j      
2021 07  08.43503  21 13 24.22   -19 13 44.9   22.7R 20QH83    G37  C~4v6j      
2021 07  08.44361  21 13 24.21   -19 13 45.2   23.0R 20QH83    G37  C~4v6j      
2021 07  08.45071  21 13 24.18   -19 13 45.4   22.8R 20QH83    G37  C~4v6j      
2021 09  13.14456  21 07 09.64   -19 32 19.9   22.6R 20QH83    G37  C~52gG      
2021 09  13.18734  21 07 09.44   -19 32 20.3   22.5R 20QH83    G37  C~52gG      

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     0.05       0.00     0.03
     2   0.0001     -2.30    -0.04       0.16    -0.02
     3   0.0002     -5.70     0.01       0.55     0.02
     4   0.0002     -6.96    -0.04       0.72     0.07
     5   0.0003     -9.26     0.01       0.89    -0.01
     6   0.0956  -2516.81    -0.01     347.43    -0.04
     7   0.0956  -2518.59     0.04     347.85    -0.01
     8   0.0957  -2519.83    -0.03     348.11     0.00
     9   0.0957  -2520.64    -0.06     348.34     0.07
    10   0.0958  -2521.34     0.02     348.45     0.01
    11   0.1066  -2725.20 (   0.37)    394.81 (   0.49)
    12   0.1066  -2725.88     0.05     394.48     0.08
    13   0.1067  -2726.17     0.09     394.47    -0.02
    14   0.1067  -2727.61    -0.09     394.57    -0.22
    15   0.8930   9480.27    -0.05    2286.58     0.07
    16   0.8931   9477.29     0.06    2286.57    -0.15
    17   0.8932   9476.40    -0.30    2287.06     0.31
    18   0.8932   9476.18     0.12    2286.82     0.02
    19   0.8932   9475.71     0.18    2286.76    -0.08
    20   1.0758   4077.15    -0.02    2789.01    -0.06
    21   1.0759   4074.33     0.01    2789.45    -0.07

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.

20QH83    quality flag:2

Type:           3:2E      3:2E  CENTAURR

axisobj        39.213    39.327    39.105
ecceobj         0.253     0.260     0.247
incobj         22.503    22.501    22.504
qmin           28.226    28.800    28.529
qmax           51.461    50.775    51.423
amean          39.455    39.455    39.462
amin           38.859    38.936    38.815
amax           40.128    40.039    40.214
emean           0.259     0.243     0.249
emin            0.235     0.212     0.231
emax            0.286     0.270     0.283
imean          23.449    24.225    23.888
imin           22.593    23.518    23.063
imax           24.207    25.085    24.211
excite_mean     0.475     0.477     0.476
fracstop        1.000     1.000     0.069
cjmean          2.791     2.788     2.782

libcent 0       178.7     180.2    -180.0
libamp  0       151.3     114.7    -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       173.4      90.2     110.7
kozaiamp        179.9      28.1      43.6