Orbit Fit and Astrometric record for 20KJ54

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: 20KJ54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:  76.97d
# First observation: 2020/05/29
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
  -0.000003   0.016637   0.000005  -0.000253   0.022438   0.000000
# Chi-squared of fit:     0.13 DOF:     24 RMS:  0.02
# Min/Max residuals:    -0.03    0.03
# Exact a, adot, b, bdot, g, gdot:
  1.489523E-05  2.200124E-02 -1.385575E-07 -2.439104E-04  2.334688E-02 -2.859465E-04
# Covariance matrix:
  5.5425E-13  1.1148E-10 -1.0592E-13  1.6401E-13  2.2509E-11  6.8547E-10
  1.1148E-10  1.9489E-07 -1.7450E-10  2.7951E-10  3.6276E-08  6.1506E-07
 -1.0592E-13 -1.7450E-10  4.2139E-13 -1.7825E-12 -3.2514E-11 -5.5770E-10
  1.6401E-13  2.7951E-10 -1.7825E-12  1.4413E-11  5.2043E-11  8.8500E-10
  2.2509E-11  3.6276E-08 -3.2514E-11  5.2043E-11  6.7624E-09  1.1666E-07
  6.8547E-10  6.1506E-07 -5.5770E-10  8.8500E-10  1.1666E-07  2.4245E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.413844  -73.125951    0.635532    0.032882   -0.783077  2458998.947781
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          248.99664 +/-    25.113
Argument of Peri:      218.43547 +/-    24.070
Long of Asc Node:      181.74942 +/-     0.460
Inclination:             2.44549 +/-     0.005
Eccentricity:         0.03013872 +/-    0.0747
Semi-Major Axis:     43.12925543 +/-    1.0253
Time of Perihelion: 2490890.4488 +/-    7126.8
Perihelion:          41.82939485 +/-    3.3706
Aphelion:            44.42911600 +/-    3.3894
Period (y)              283.2475 +/-     10.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.04681406 +/-    0.0437
Ecliptic Y          -41.89311622 +/-    0.1442
Ecliptic Z            1.80403440 +/-    0.0064
Ecliptic XDOT         0.00246771 +/-    0.0001
Ecliptic YDOT         0.00078336 +/-    0.0002
Ecliptic ZDOT        -0.00003022 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.62812689 +/-    0.1390
Geocenter to KBO     42.83227862 +/-    0.1509
# Hcoef:  9.24

The following table shows the complete astrometric record for 20KJ54. 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 (20KJ54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  29.44698  19 11 53.709  -19 58 43.48  25.5r 20KJ54    266  C~6c5Z      
2020 05  29.53371  19 11 53.390  -19 58 43.86  25.5r 20KJ54    266  C~6c5Z      
2020 05  29.61905  19 11 53.074  -19 58 44.22  25.5r 20KJ54    266  C~6c5Z      
2020 06  21.45390  19 10 17.245  -20 00 56.04  25.7r 20KJ54    266  C~6c5Z      
2020 06  21.53376  19 10 16.866  -20 00 56.60  25.7r 20KJ54    266  C~6c5Z      
2020 06  21.61261  19 10 16.493  -20 00 57.15  25.7r 20KJ54    266  C~6c5Z      
2020 06  24.43648  19 10 03.243  -20 01 17.65  25.5r 20KJ54    266  C~6c5Z      
2020 06  24.51899  19 10 02.846  -20 01 18.25  25.5r 20KJ54    266  C~6c5Z      
2020 06  24.61428  19 10 02.388  -20 01 18.93  25.5r 20KJ54    266  C~6c5Z      
2020 08  12.26680  19 06 17.723  -20 08 07.71  25.6r 20KJ54    266  C~6c5Z      
2020 08  12.34843  19 06 17.402  -20 08 08.39  25.6r 20KJ54    266  C~6c5Z      
2020 08  12.42950  19 06 17.084  -20 08 09.05  25.6r 20KJ54    266  C~6c5Z      
2020 08  14.24286  19 06 10.233  -20 08 23.97  25.5r 20KJ54    266  C~6c5Z      
2020 08  14.33285  19 06 09.890  -20 08 24.71  25.5r 20KJ54    266  C~6c5Z      
2020 08  14.42134  19 06 09.553  -20 08 25.43  25.5r 20KJ54    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     0.00       0.00    -0.01
     2   0.0002     -4.51     0.01       0.18    -0.01
     3   0.0005     -8.97    -0.00       0.37    -0.01
     4   0.0630  -1365.77    -0.02      33.86     0.03
     5   0.0632  -1371.14    -0.03      33.94     0.03
     6   0.0634  -1376.42    -0.03      34.03     0.02
     7   0.0712  -1564.29     0.02      36.14    -0.02
     8   0.0714  -1569.91     0.03      36.22    -0.01
     9   0.0716  -1576.40     0.03      36.32    -0.01
    10   0.2048  -4768.47    -0.00       1.71    -0.02
    11   0.2051  -4773.04    -0.01       1.55    -0.01
    12   0.2053  -4777.57    -0.01       1.41    -0.01
    13   0.2103  -4875.18     0.00      -2.37     0.01
    14   0.2105  -4880.06     0.01      -2.55     0.02
    15   0.2107  -4884.86     0.00      -2.73     0.01

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.

20KJ54    quality flag:1

Type:      CLASSICAL CLASSICAL   REMOVED

axisobj        42.620    48.642    39.948
ecceobj         0.038     0.174     0.195
incobj          2.447     2.435     2.460
qmin           39.922    39.597    30.836
qmax           45.966    58.750    62.604
amean          42.829    48.964    42.524
amin           42.490    48.520    34.117
amax           43.171    49.465    47.355
emean           0.047     0.176     0.230
emin            0.026     0.165     0.082
emax            0.065     0.188     0.323
imean           3.664     2.805     1.698
imin            2.519     2.475     0.207
imax            4.506     3.127     2.717
excite_mean     0.079     0.183     0.232
fracstop        1.000     1.000     0.425
cjmean          3.080     3.122     3.019

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       184.3     170.7     183.1
kozaiamp        180.0     180.0     179.9