Orbit Fit and Astrometric record for 20KR54

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: 20KR54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:  76.98d
# First observation: 2020/05/28
#  Last observation: 2020/08/13
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.019530   0.000003   0.000231   0.023887   0.000000
# Chi-squared of fit:     0.32 DOF:     36 RMS:  0.02
# Min/Max residuals:    -0.05    0.04
# Exact a, adot, b, bdot, g, gdot:
  1.579299E-05  2.512624E-02  1.166511E-07  2.165648E-04  2.481685E-02  3.354582E-04
# Covariance matrix:
  1.9844E-13  1.0571E-11 -7.8296E-15 -1.7272E-14  2.7576E-12  1.7847E-10
  1.0571E-11  1.6216E-07 -8.9259E-11 -3.6179E-10  3.0537E-08  5.6461E-07
 -7.8296E-15 -8.9259E-11  1.7713E-13 -7.4620E-13 -1.6823E-11 -3.1377E-10
 -1.7272E-14 -3.6179E-10 -7.4620E-13  1.6110E-11 -6.8064E-11 -1.2431E-09
  2.7576E-12  3.0537E-08 -1.6823E-11 -6.8064E-11  5.7559E-09  1.0750E-07
  1.7847E-10  5.6461E-07 -3.1377E-10 -1.2431E-09  1.0750E-07  2.2409E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.004133  -72.223119    0.660695    0.026542   -0.762157  2458997.947541
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          357.79667 +/-    43.212
Argument of Peri:       77.72323 +/-    49.980
Long of Asc Node:      211.67615 +/-     0.330
Inclination:             2.03395 +/-     0.003
Eccentricity:         0.07358935 +/-    0.0238
Semi-Major Axis:     44.33035451 +/-    1.1153
Time of Perihelion: 2459650.3219 +/-   12940.4
Perihelion:          41.06811275 +/-    1.4769
Aphelion:            47.59259627 +/-    1.5960
Period (y)              295.1617 +/-     11.14
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.90436175 +/-    0.0376
Ecliptic Y          -39.28251097 +/-    0.1172
Ecliptic Z            1.40926240 +/-    0.0043
Ecliptic XDOT         0.00265878 +/-    0.0001
Ecliptic YDOT         0.00081543 +/-    0.0001
Ecliptic ZDOT         0.00002494 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.07085971 +/-    0.1127
Geocenter to KBO     40.29520596 +/-    0.1232
# Hcoef:  9.91

The following table shows the complete astrometric record for 20KR54. 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 (20KR54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  28.44674  19 15 55.677  -20 16 16.91  26.1r 20KR54    266  C~6c5a      
2020 05  28.50129  19 15 55.474  -20 16 17.17  26.1r 20KR54    266  C~6c5a      
2020 05  28.55756  19 15 55.264  -20 16 17.43  26.1r 20KR54    266  C~6c5a      
2020 05  30.43935  19 15 48.294  -20 16 26.28  25.9r 20KR54    266  C~6c5a      
2020 05  30.53044  19 15 47.943  -20 16 26.74  25.9r 20KR54    266  C~6c5a      
2020 05  30.61862  19 15 47.602  -20 16 27.16  25.9r 20KR54    266  C~6c5a      
2020 06  01.43269  19 15 40.652  -20 16 36.33  26.2r 20KR54    266  C~6c5a      
2020 06  01.47325  19 15 40.490  -20 16 36.55  26.2r 20KR54    266  C~6c5a      
2020 06  01.60571  19 15 39.961  -20 16 37.24  26.2r 20KR54    266  C~6c5a      
2020 06  20.45583  19 14 16.748  -20 18 39.06  25.8r 20KR54    266  C~6c5a      
2020 06  20.52860  19 14 16.390  -20 18 39.61  25.8r 20KR54    266  C~6c5a      
2020 06  20.62233  19 14 15.930  -20 18 40.30  25.8r 20KR54    266  C~6c5a      
2020 06  22.44948  19 14 07.054  -20 18 54.38  26.2r 20KR54    266  C~6c5a      
2020 06  22.52092  19 14 06.698  -20 18 54.93  26.2r 20KR54    266  C~6c5a      
2020 06  22.59118  19 14 06.348  -20 18 55.47  26.2r 20KR54    266  C~6c5a      
2020 06  25.44823  19 13 52.253  -20 19 18.09  25.9r 20KR54    266  C~6c5a      
2020 06  25.53213  19 13 51.828  -20 19 18.76  25.9r 20KR54    266  C~6c5a      
2020 06  25.61487  19 13 51.410  -20 19 19.41  25.9r 20KR54    266  C~6c5a      
2020 08  13.24332  19 09 55.646  -20 26 30.66  25.7r 20KR54    266  C~6c5a      
2020 08  13.33331  19 09 55.277  -20 26 31.43  25.7r 20KR54    266  C~6c5a      
2020 08  13.42301  19 09 54.909  -20 26 32.18  25.7r 20KR54    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     0.04       0.00     0.00
     2   0.0001     -2.87     0.04       0.11     0.00
     3   0.0003     -5.83     0.04       0.24     0.00
     4   0.0055   -104.22    -0.02       4.15     0.01
     5   0.0057   -109.18    -0.02       4.33     0.01
     6   0.0059   -113.99    -0.02       4.53     0.01
     7   0.0109   -212.15    -0.02       8.07    -0.04
     8   0.0110   -214.44    -0.03       8.15    -0.04
     9   0.0114   -221.91    -0.03       8.43    -0.05
    10   0.0630  -1398.60    -0.00      37.50     0.01
    11   0.0632  -1403.67     0.00      37.59     0.01
    12   0.0635  -1410.18     0.01      37.73     0.01
    13   0.0685  -1535.82     0.00      39.60     0.00
    14   0.0686  -1540.86     0.01      39.69     0.01
    15   0.0688  -1545.81     0.00      39.78    -0.00
    16   0.0767  -1745.36     0.00      42.43     0.03
    17   0.0769  -1751.38     0.00      42.52     0.03
    18   0.0771  -1757.29     0.00      42.62     0.03
    19   0.2103  -5101.21    -0.01      23.73    -0.01
    20   0.2105  -5106.46     0.00      23.59    -0.01
    21   0.2107  -5111.68     0.00      23.47    -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.

20KR54    quality flag:1

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        43.744    50.343    40.647
ecceobj         0.063     0.237     0.138
incobj          2.042     2.034     2.051
qmin           40.431    37.828    34.681
qmax           47.756    64.194    47.275
amean          43.972    50.718    40.830
amin           43.619    50.225    40.489
amax           44.336    51.299    41.202
emean           0.061     0.240     0.083
emin            0.044     0.229     0.038
emax            0.078     0.252     0.148
imean           3.497     3.101     7.403
imin            2.816     2.681     2.895
imax            4.161     3.448    11.159
excite_mean     0.087     0.246     0.160
fracstop        1.000     1.000     1.000
cjmean          3.092     3.110     3.035

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       175.3     170.5     179.4
kozaiamp        179.9     180.0     179.9