Orbit Fit and Astrometric record for 20KZ54

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: 20KZ54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:  26.17d
# First observation: 2020/05/29
#  Last observation: 2020/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.020296  -0.000000  -0.003204   0.021544   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# Chi-squared of fit:     0.61 DOF:     25 RMS:  0.04
# Min/Max residuals:    -0.06    0.06
# Exact a, adot, b, bdot, g, gdot:
  1.273527E-05  1.722338E-02 -2.467594E-06 -3.127727E-03  2.089847E-02 -9.658078E-03
# Covariance matrix:
  5.2289E-13  6.9627E-10 -2.8997E-14 -1.5063E-11  1.3164E-10  3.7957E-09
  6.9627E-10  1.4738E-06 -6.0850E-11 -3.1359E-08  2.7495E-07  5.9248E-06
 -2.8997E-14 -6.0850E-11  1.7660E-13 -1.4295E-12 -1.1363E-11 -2.5230E-10
 -1.5063E-11 -3.1359E-08 -1.4295E-12  7.6643E-10 -5.8642E-09 -1.3686E-07
  1.3164E-10  2.7495E-07 -1.1363E-11 -5.8642E-09  5.1386E-08  1.1751E-06
  3.7957E-09  5.9248E-06 -2.5230E-10 -1.3686E-07  1.1751E-06  8.0105E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.351439  -73.098703    0.635905    0.032017   -0.782810  2458998.947781
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          313.39142 +/-    42.249
Argument of Peri:      273.46552 +/-    11.437
Long of Asc Node:      118.64828 +/-     0.810
Inclination:            10.57648 +/-     0.668
Eccentricity:         0.50679681 +/-    0.4275
Semi-Major Axis:     56.22100474 +/-   29.5110
Time of Perihelion: 2478925.1999 +/-    8953.9
Perihelion:          27.72837893 +/-   28.0958
Aphelion:            84.71363054 +/-   50.5455
Period (y)              421.5568 +/-    331.92
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           13.52448481 +/-    0.1507
Ecliptic Y          -46.68640179 +/-    0.4962
Ecliptic Z            1.96319858 +/-    0.0213
Ecliptic XDOT         0.00180439 +/-    0.0004
Ecliptic YDOT         0.00185306 +/-    0.0011
Ecliptic ZDOT        -0.00046156 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.64551315 +/-    0.4781
Geocenter to KBO     47.85039881 +/-    0.5190
# Hcoef:  9.52

The following table shows the complete astrometric record for 20KZ54. 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 (20KZ54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  29.44698  19 12 02.570  -20 02 14.38  26.4r 20KZ54    266  C~6c5a      
2020 05  29.53371  19 12 02.277  -20 02 14.88  26.4r 20KZ54    266  C~6c5a      
2020 05  29.61905  19 12 01.987  -20 02 15.36  26.4r 20KZ54    266  C~6c5a      
2020 05  30.43935  19 11 59.259  -20 02 20.07  26.3r 20KZ54    266  C~6c5a      
2020 05  30.53044  19 11 58.946  -20 02 20.61  26.3r 20KZ54    266  C~6c5a      
2020 05  30.61862  19 11 58.642  -20 02 21.11  26.3r 20KZ54    266  C~6c5a      
2020 05  31.44139  19 11 55.859  -20 02 25.98  26.3r 20KZ54    266  C~6c5a      
2020 05  31.52961  19 11 55.551  -20 02 26.52  26.3r 20KZ54    266  C~6c5a      
2020 05  31.61814  19 11 55.242  -20 02 27.04  26.3r 20KZ54    266  C~6c5a      
2020 06  21.45390  19 10 34.270  -20 04 55.89  26.4r 20KZ54    266  C~6c5a      
2020 06  21.53376  19 10 33.924  -20 04 56.54  26.4r 20KZ54    266  C~6c5a      
2020 06  21.61261  19 10 33.583  -20 04 57.18  26.4r 20KZ54    266  C~6c5a      
2020 06  24.43648  19 10 21.468  -20 05 20.80  26.2r 20KZ54    266  C~6c5a      
2020 06  24.51899  19 10 21.105  -20 05 21.49  26.2r 20KZ54    266  C~6c5a      
2020 06  24.61428  19 10 20.686  -20 05 22.28  26.2r 20KZ54    266  C~6c5a      

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     0.06       0.00     0.02
     2   0.0002     -4.16     0.06       0.01     0.02
     3   0.0005     -8.27     0.05       0.04     0.02
     4   0.0027    -47.00     0.02       0.09     0.01
     5   0.0030    -51.45     0.02       0.10     0.01
     6   0.0032    -55.76     0.01       0.13     0.01
     7   0.0055    -95.28    -0.05       0.12    -0.03
     8   0.0057    -99.65    -0.06       0.12    -0.04
     9   0.0059   -104.04    -0.05       0.14    -0.04
    10   0.0630  -1254.58     0.04      -8.52     0.02
    11   0.0632  -1259.49     0.04      -8.57     0.02
    12   0.0634  -1264.34     0.04      -8.63     0.02
    13   0.0712  -1436.62    -0.02     -11.47    -0.02
    14   0.0714  -1441.78    -0.01     -11.53    -0.02
    15   0.0716  -1447.74    -0.02     -11.61    -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.

20KZ54    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0