Orbit Fit and Astrometric record for 20KA54

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: 20KA54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:  76.98d
# First observation: 2020/05/28
#  Last observation: 2020/08/13
Preliminary a, adot, b, bdot, g, gdot:
   0.000002   0.020261   0.000003  -0.004809   0.023864   0.000000
# Chi-squared of fit:     0.62 DOF:     30 RMS:  0.03
# Min/Max residuals:    -0.08    0.07
# Exact a, adot, b, bdot, g, gdot:
  1.600758E-05  2.504738E-02 -3.439692E-06 -4.808601E-03  2.464771E-02 -1.437588E-03
# Covariance matrix:
  2.8849E-13  6.2519E-11 -3.8706E-14 -5.4984E-13  1.2825E-11  4.1185E-10
  6.2519E-11  1.9359E-07 -1.2418E-10 -1.1370E-09  3.6667E-08  7.1946E-07
 -3.8706E-14 -1.2418E-10  2.4445E-13 -4.6368E-13 -2.3507E-11 -4.5787E-10
 -5.4984E-13 -1.1370E-09 -4.6368E-13  2.3898E-11 -2.1668E-10 -4.5252E-09
  1.2825E-11  3.6667E-08 -2.3507E-11 -2.1668E-10  6.9513E-09  1.3757E-07
  4.1185E-10  7.1946E-07 -4.5787E-10 -4.5252E-09  1.3757E-07  2.9722E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.316083  -72.143099    0.661759    0.030654   -0.761079  2458997.947541
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          335.69116 +/-    21.300
Argument of Peri:      200.82270 +/-    30.062
Long of Asc Node:      118.67028 +/-     0.206
Inclination:            11.04845 +/-     0.190
Eccentricity:         0.14996178 +/-    0.0189
Semi-Major Axis:     47.63134088 +/-    0.8808
Time of Perihelion: 2467098.2312 +/-    7100.8
Perihelion:          40.48846012 +/-    1.1712
Aphelion:            54.77422163 +/-    1.3554
Period (y)              328.7361 +/-      9.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.04010697 +/-    0.0420
Ecliptic Y          -39.52041148 +/-    0.1305
Ecliptic Z            1.63952646 +/-    0.0056
Ecliptic XDOT         0.00261402 +/-    0.0001
Ecliptic YDOT         0.00098801 +/-    0.0002
Ecliptic ZDOT        -0.00054039 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.34628334 +/-    0.1254
Geocenter to KBO     40.57172163 +/-    0.1372
# Hcoef: 10.33

The following table shows the complete astrometric record for 20KA54. 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 (20KA54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  28.44674  19 16 05.608  -19 57 06.05  26.2r 20KA54    266  C~7ulo      
2020 05  28.50129  19 16 05.409  -19 57 06.45  26.2r 20KA54    266  C~7ulo      
2020 05  28.55756  19 16 05.203  -19 57 06.85  26.2r 20KA54    266  C~7ulo      
2020 05  30.43935  19 15 58.359  -19 57 20.51  26.2r 20KA54    266  C~6c5Y      
2020 05  30.53044  19 15 58.014  -19 57 21.20  26.2r 20KA54    266  C~6c5Y      
2020 05  30.61862  19 15 57.679  -19 57 21.84  26.2r 20KA54    266  C~6c5Y      
2020 06  20.45583  19 14 28.276  -20 00 27.08  26.7r 20KA54    266  C~6c5Y      
2020 06  20.52860  19 14 27.923  -20 00 27.82  26.7r 20KA54    266  C~6c5Y      
2020 06  20.62233  19 14 27.470  -20 00 28.76  26.7r 20KA54    266  C~6c5Y      
2020 06  22.44948  19 14 18.729  -20 00 47.70  26.5r 20KA54    266  C~6c5Y      
2020 06  22.52092  19 14 18.378  -20 00 48.44  26.5r 20KA54    266  C~6c5Y      
2020 06  22.59118  19 14 18.034  -20 00 49.16  26.5r 20KA54    266  C~6c5Y      
2020 06  25.44823  19 14 04.144  -20 01 19.44  26.6r 20KA54    266  C~6c5Y      
2020 06  25.53213  19 14 03.725  -20 01 20.33  26.6r 20KA54    266  C~6c5Y      
2020 06  25.61487  19 14 03.313  -20 01 21.20  26.6r 20KA54    266  C~6c5Y      
2020 08  13.24332  19 10 10.819  -20 10 51.58  26.3r 20KA54    266  C~6c5Y      
2020 08  13.33331  19 10 10.454  -20 10 52.62  26.3r 20KA54    266  C~6c5Y      
2020 08  13.42301  19 10 10.091  -20 10 53.63  26.3r 20KA54    266  C~6c5Y      

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     0.01       0.00     0.07
     2   0.0001     -2.83     0.02      -0.03     0.07
     3   0.0003     -5.77     0.02      -0.05     0.06
     4   0.0055   -103.22    -0.02      -1.08    -0.08
     5   0.0057   -108.13    -0.02      -1.14    -0.08
     6   0.0059   -112.90    -0.01      -1.16    -0.08
     7   0.0630  -1386.59    -0.01     -22.96     0.01
     8   0.0632  -1391.62    -0.01     -23.06     0.01
     9   0.0635  -1398.07    -0.01     -23.18     0.01
    10   0.0685  -1522.69     0.02     -26.29    -0.01
    11   0.0686  -1527.69     0.02     -26.39    -0.01
    12   0.0688  -1532.59     0.03     -26.49    -0.01
    13   0.0767  -1730.62    -0.01     -31.68     0.01
    14   0.0769  -1736.59    -0.01     -31.81     0.02
    15   0.0771  -1742.46    -0.01     -31.94     0.01
    16   0.2103  -5063.83     0.00    -192.30    -0.01
    17   0.2105  -5069.07    -0.00    -192.71    -0.00
    18   0.2107  -5074.26    -0.00    -193.09     0.00

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.

20KA54    quality flag:1

Type:      CLASSICAL  SCATNEAR  SCATNEAR

axisobj        46.975    54.248    44.329
ecceobj         0.143     0.269     0.191
incobj         11.080    10.494    11.614
qmin           39.687    39.006    35.149
qmax           55.237    70.995    54.519
amean          47.227    54.642    44.567
amin           46.817    54.078    44.085
amax           47.719    55.290    45.121
emean           0.143     0.272     0.193
emin            0.130     0.261     0.165
emax            0.158     0.284     0.211
imean           9.503     8.873     9.635
imin            9.108     8.482     8.758
imax            9.924     9.200    10.740
excite_mean     0.219     0.313     0.255
fracstop        1.000     1.000     1.000
cjmean          3.082     3.112     3.029

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       187.2     188.7     191.1
kozaiamp        180.0     180.0     180.0