Orbit Fit and Astrometric record for 20KH54

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: 20KH54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:  79.98d
# First observation: 2020/05/26
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000005   0.015628   0.000004  -0.000708   0.022053   0.000000
# Chi-squared of fit:     0.61 DOF:     36 RMS:  0.03
# Min/Max residuals:    -0.06    0.06
# Exact a, adot, b, bdot, g, gdot:
  1.489969E-05  2.162551E-02 -6.185174E-07 -7.143298E-04  2.307529E-02  3.420766E-03
# Covariance matrix:
  2.1050E-13 -1.0617E-11  5.2513E-15 -1.3888E-15 -1.1850E-12  1.1907E-10
 -1.0617E-11  1.0166E-07 -6.9676E-11 -1.6994E-10  1.9100E-08  3.4203E-07
  5.2513E-15 -6.9676E-11  1.8585E-13 -6.7993E-13 -1.3105E-11 -2.3758E-10
 -1.3888E-15 -1.6994E-10 -6.7993E-13  9.5723E-12 -3.2093E-11 -6.0965E-10
 -1.1850E-12  1.9100E-08 -1.3105E-11 -3.2093E-11  3.5946E-09  6.5666E-08
  1.1907E-10  3.4203E-07 -2.3758E-10 -6.0965E-10  6.5666E-08  1.4744E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.550400  -73.292298    0.672031    0.033358   -0.751781  2458995.943811
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           76.48317 +/-    12.668
Argument of Peri:       33.61261 +/-     9.827
Long of Asc Node:      159.52844 +/-     0.456
Inclination:             3.10901 +/-     0.018
Eccentricity:         0.14091401 +/-    0.0551
Semi-Major Axis:     44.70098473 +/-    1.5817
Time of Perihelion: 2435798.5393 +/-    3638.7
Perihelion:          38.40198987 +/-    2.8149
Aphelion:            50.99997959 +/-    3.0551
Period (y)              298.8710 +/-     15.86
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.02471366 +/-    0.0323
Ecliptic Y          -42.38660518 +/-    0.1077
Ecliptic Z            1.92843467 +/-    0.0050
Ecliptic XDOT         0.00258329 +/-    0.0001
Ecliptic YDOT         0.00034920 +/-    0.0001
Ecliptic ZDOT        -0.00006684 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.10143873 +/-    0.1039
Geocenter to KBO     43.33640250 +/-    0.1126
# Hcoef:  8.88

The following table shows the complete astrometric record for 20KH54. 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 (20KH54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  26.44301  19 11 07.342  -19 51 48.69  25.5r 20KH54    266  C~7ulo      
2020 05  26.50149  19 11 07.140  -19 51 48.93  25.5r 20KH54    266  C~7ulo      
2020 05  26.55599  19 11 06.951  -19 51 49.14  25.5r 20KH54    266  C~7ulo      
2020 05  29.44698  19 10 56.882  -19 52 00.94  25.4r 20KH54    266  C~6c5Z      
2020 05  29.53511  19 10 56.559  -19 52 01.33  25.4r 20KH54    266  C~6c5Z      
2020 05  29.61905  19 10 56.252  -19 52 01.69  25.4r 20KH54    266  C~6c5Z      
2020 05  31.44139  19 10 49.630  -19 52 09.80  25.4r 20KH54    266  C~6c5Z      
2020 05  31.52961  19 10 49.297  -19 52 10.21  25.4r 20KH54    266  C~6c5Z      
2020 05  31.61814  19 10 48.962  -19 52 10.61  25.4r 20KH54    266  C~6c5Z      
2020 06  21.45390  19 09 21.266  -19 54 14.81  25.4r 20KH54    266  C~6c5Z      
2020 06  21.53376  19 09 20.891  -19 54 15.38  25.4r 20KH54    266  C~6c5Z      
2020 06  21.61261  19 09 20.522  -19 54 15.92  25.4r 20KH54    266  C~6c5Z      
2020 06  24.43648  19 09 07.397  -19 54 36.61  24.5r 20KH54    266  C~7ulo      
2020 06  24.48544  19 09 07.163  -19 54 36.97  24.5r 20KH54    266  C~7ulo      
2020 06  24.53438  19 09 06.930  -19 54 37.33  24.5r 20KH54    266  C~7ulo      
2020 08  12.26680  19 05 24.772  -20 01 32.25  25.4r 20KH54    266  C~6c5Z      
2020 08  12.34843  19 05 24.456  -20 01 32.95  25.4r 20KH54    266  C~6c5Z      
2020 08  12.42950  19 05 24.143  -20 01 33.63  25.4r 20KH54    266  C~6c5Z      
2020 08  14.24286  19 05 17.398  -20 01 49.01  25.2r 20KH54    266  C~6c5Z      
2020 08  14.33285  19 05 17.060  -20 01 49.77  25.2r 20KH54    266  C~6c5Z      
2020 08  14.42134  19 05 16.728  -20 01 50.50  25.2r 20KH54    266  C~6c5Z      

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     0.03
     2   0.0002     -2.86    -0.01       0.11     0.02
     3   0.0003     -5.53    -0.00       0.22     0.02
     4   0.0082   -147.96     0.01       5.76    -0.01
     5   0.0085   -152.53    -0.00       5.93    -0.01
     6   0.0087   -156.87     0.01       6.10    -0.01
     7   0.0137   -250.58    -0.00       9.37    -0.01
     8   0.0139   -255.30     0.00       9.54    -0.00
     9   0.0142   -260.04     0.00       9.71    -0.01
    10   0.0712  -1503.02     0.06      34.93     0.00
    11   0.0714  -1508.34     0.06      34.99     0.00
    12   0.0716  -1513.57     0.06      35.07     0.01
    13   0.0794  -1699.84    -0.06      36.52    -0.03
    14   0.0795  -1703.16    -0.06      36.56    -0.02
    15   0.0796  -1706.47    -0.06      36.59    -0.02
    16   0.2131  -4866.35     0.02     -12.55     0.05
    17   0.2133  -4870.85     0.02     -12.74     0.05
    18   0.2135  -4875.32     0.02     -12.92     0.04
    19   0.2185  -4971.56    -0.01     -17.45    -0.04
    20   0.2187  -4976.38    -0.01     -17.67    -0.04
    21   0.2190  -4981.11    -0.02     -17.87    -0.04

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.

20KH54    quality flag:1

Type:      CLASSICAL  SCATNEAR  SCATNEAR

axisobj        44.114    50.963    40.319
ecceobj         0.138     0.288     0.110
incobj          3.109     3.059     3.169
qmin           37.428    35.755    32.739
qmax           51.656    67.819    48.640
amean          44.364    51.295    40.539
amin           43.997    50.626    39.989
amax           44.772    52.043    40.920
emean           0.133     0.287     0.108
emin            0.116     0.272     0.052
emax            0.154     0.303     0.191
imean           3.067     2.732     6.700
imin            1.995     2.068     2.223
imax            4.017     3.402    13.174
excite_mean     0.144     0.291     0.160
fracstop        1.000     1.000     1.000
cjmean          3.080     3.084     3.030

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       179.8     174.8     179.9
kozaiamp        179.9     179.9     180.0