Orbit Fit and Astrometric record for 20KB54

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: 20KB54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     24 observations of     24
# Arc:  75.98d
# First observation: 2020/05/30
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.015720   0.000004  -0.000581   0.021929   0.000000
# Chi-squared of fit:     0.19 DOF:     42 RMS:  0.02
# Min/Max residuals:    -0.03    0.05
# Exact a, adot, b, bdot, g, gdot:
  1.471813E-05  2.140022E-02 -3.906470E-07 -5.747533E-04  2.289652E-02  1.356722E-03
# Covariance matrix:
  2.8958E-13  5.3581E-11 -4.2581E-14  2.4075E-14  1.0965E-11  3.7641E-10
  5.3581E-11  1.4878E-07 -1.1064E-10  1.0887E-10  2.7547E-08  4.6671E-07
 -4.2581E-14 -1.1064E-10  2.3236E-13 -9.6313E-13 -2.0502E-11 -3.5066E-10
  2.4075E-14  1.0887E-10 -9.6313E-13  8.8247E-12  2.0043E-11  3.1442E-10
  1.0965E-11  2.7547E-08 -2.0502E-11  2.0043E-11  5.1071E-09  8.7930E-08
  3.7641E-10  4.6671E-07 -3.5066E-10  3.1442E-10  8.7930E-08  1.8174E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.317344  -72.708128    0.628172    0.031804   -0.789088  2458999.940151
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           92.34029 +/-    45.855
Argument of Peri:       25.46282 +/-    41.332
Long of Asc Node:      163.05270 +/-     0.574
Inclination:             2.72622 +/-     0.018
Eccentricity:         0.04884102 +/-    0.0584
Semi-Major Axis:     44.28197581 +/-    1.3423
Time of Perihelion: 2431382.9633 +/-   13651.9
Perihelion:          42.11919877 +/-    2.8821
Aphelion:            46.44475286 +/-    2.9426
Period (y)              294.6787 +/-     13.40
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.61185329 +/-    0.0405
Ecliptic Y          -42.61428066 +/-    0.1300
Ecliptic Z            1.76601021 +/-    0.0055
Ecliptic XDOT         0.00250040 +/-    0.0001
Ecliptic YDOT         0.00060675 +/-    0.0001
Ecliptic ZDOT        -0.00006234 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.47644940 +/-    0.1251
Geocenter to KBO     43.67476211 +/-    0.1363
# Hcoef:  9.25

The following table shows the complete astrometric record for 20KB54. 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 (20KB54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  30.43935  19 13 42.569  -20 01 21.30  25.5r 20KB54    266  C~6c5Y      
2020 05  30.53044  19 13 42.237  -20 01 21.74  25.5r 20KB54    266  C~6c5Y      
2020 05  30.61862  19 13 41.914  -20 01 22.14  25.5r 20KB54    266  C~6c5Y      
2020 06  01.43269  19 13 35.336  -20 01 30.91  26.0r 20KB54    266  C~6c5Y      
2020 06  01.47325  19 13 35.184  -20 01 31.12  26.0r 20KB54    266  C~6c5Y      
2020 06  01.60571  19 13 34.684  -20 01 31.78  26.0r 20KB54    266  C~6c5Y      
2020 06  20.45583  19 12 16.395  -20 03 28.39  25.6r 20KB54    266  C~6c5Y      
2020 06  20.52860  19 12 16.060  -20 03 28.91  25.6r 20KB54    266  C~6c5Y      
2020 06  20.62233  19 12 15.628  -20 03 29.57  25.6r 20KB54    266  C~6c5Y      
2020 06  22.44948  19 12 07.311  -20 03 43.02  25.5r 20KB54    266  C~6c5Y      
2020 06  22.52092  19 12 06.977  -20 03 43.55  25.5r 20KB54    266  C~6c5Y      
2020 06  22.59118  19 12 06.650  -20 03 44.06  25.5r 20KB54    266  C~6c5Y      
2020 06  25.44823  19 11 53.452  -20 04 05.76  25.4r 20KB54    266  C~6c5Y      
2020 06  25.53213  19 11 53.054  -20 04 06.40  25.4r 20KB54    266  C~6c5Y      
2020 06  25.61487  19 11 52.663  -20 04 07.02  25.4r 20KB54    266  C~6c5Y      
2020 08  12.26680  19 08 16.482  -20 10 58.12  26.1r 20KB54    266  C~6c5Y      
2020 08  12.34843  19 08 16.165  -20 10 58.82  26.1r 20KB54    266  C~6c5Y      
2020 08  12.42950  19 08 15.851  -20 10 59.49  26.1r 20KB54    266  C~6c5Y      
2020 08  13.24332  19 08 12.796  -20 11 06.29  25.7r 20KB54    266  C~6c5Y      
2020 08  13.33331  19 08 12.452  -20 11 07.05  25.7r 20KB54    266  C~6c5Y      
2020 08  13.42301  19 08 12.109  -20 11 07.79  25.7r 20KB54    266  C~6c5Y      
2020 08  14.24286  19 08 09.079  -20 11 14.72  25.5r 20KB54    266  C~6c5Y      
2020 08  14.33285  19 08 08.740  -20 11 15.48  25.5r 20KB54    266  C~6c5Y      
2020 08  14.42134  19 08 08.407  -20 11 16.21  25.5r 20KB54    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    -0.00
     2   0.0002     -4.70     0.02       0.15    -0.00
     3   0.0005     -9.26     0.01       0.33     0.00
     4   0.0055   -102.34    -0.02       3.28    -0.01
     5   0.0056   -104.49    -0.01       3.35    -0.01
     6   0.0059   -111.56    -0.01       3.58    -0.01
     7   0.0575  -1220.73    -0.01      25.42    -0.01
     8   0.0577  -1225.48    -0.00      25.49    -0.00
     9   0.0580  -1231.60    -0.01      25.59     0.00
    10   0.0630  -1349.55     0.00      26.73     0.01
    11   0.0632  -1354.29    -0.00      26.78     0.02
    12   0.0634  -1358.92     0.00      26.84     0.02
    13   0.0712  -1546.14     0.01      28.24     0.00
    14   0.0714  -1551.79     0.01      28.30     0.00
    15   0.0717  -1557.33     0.01      28.36     0.00
    16   0.2021  -4630.14     0.01     -13.05    -0.01
    17   0.2024  -4634.65     0.00     -13.22    -0.02
    18   0.2026  -4639.13     0.01     -13.36    -0.01
    19   0.2048  -4682.66    -0.01     -15.05     0.04
    20   0.2050  -4687.56    -0.00     -15.24     0.04
    21   0.2053  -4692.45    -0.01     -15.41     0.05
    22   0.2075  -4735.65    -0.00     -17.27    -0.03
    23   0.2078  -4740.48    -0.00     -17.46    -0.03
    24   0.2080  -4745.22    -0.00     -17.64    -0.03

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.

20KB54    quality flag:1

Type:      CLASSICAL  SCATNEAR  SCATNEAR

axisobj        43.735    50.318    40.457
ecceobj         0.048     0.224     0.145
incobj          2.726     2.676     2.785
qmin           40.981    38.527    33.566
qmax           47.179    63.362    48.755
amean          43.971    50.650    40.794
amin           43.625    50.146    40.190
amax           44.330    51.215    41.409
emean           0.049     0.226     0.152
emin            0.033     0.215     0.122
emax            0.065     0.238     0.179
imean           2.792     2.448     1.735
imin            2.101     2.104     1.096
imax            3.485     2.767     2.333
excite_mean     0.069     0.230     0.155
fracstop        1.000     1.000     1.000
cjmean          3.095     3.119     3.039

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       176.9     178.1     181.4
kozaiamp        180.0     180.0     179.9