Orbit Fit and Astrometric record for 20KF56

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: 20KF56    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:  77.97d
# First observation: 2020/05/28
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000006   0.015780   0.000003   0.004172   0.023093   0.000000
# Chi-squared of fit:     0.28 DOF:     24 RMS:  0.02
# Min/Max residuals:    -0.05    0.03
# Exact a, adot, b, bdot, g, gdot:
  1.522506E-05  2.374094E-02  2.575791E-06  4.152753E-03  2.445025E-02  1.030324E-03
# Covariance matrix:
  1.9908E-13  1.2120E-11 -7.4619E-15  1.4323E-13  3.0548E-12  1.8367E-10
  1.2120E-11  2.4012E-07 -8.9150E-11  1.6028E-10  4.4407E-08  6.3060E-07
 -7.4619E-15 -8.9150E-11  1.8624E-13 -9.7716E-13 -1.6526E-11 -2.4278E-10
  1.4323E-13  1.6028E-10 -9.7716E-13  1.5460E-11  3.1556E-11  8.6388E-10
  3.0548E-12  4.4407E-08 -1.6526E-11  3.1556E-11  8.2223E-09  1.1875E-07
  1.8367E-10  6.3060E-07 -2.4278E-10  8.6388E-10  1.1875E-07  2.1482E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.065834  -72.791060    0.653103    0.027598   -0.768636  2458997.947541
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           36.33908 +/-    36.704
Argument of Peri:      332.16286 +/-    41.815
Long of Asc Node:      274.87238 +/-     0.237
Inclination:            10.11663 +/-     0.201
Eccentricity:         0.04352230 +/-    0.0624
Semi-Major Axis:     43.16371267 +/-    1.3870
Time of Perihelion: 2448534.9223 +/-   10548.7
Perihelion:          41.28512876 +/-    3.0005
Aphelion:            45.04229658 +/-    3.0558
Period (y)              283.5870 +/-     13.67
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.70180820 +/-    0.0448
Ecliptic Y          -39.97778139 +/-    0.1448
Ecliptic Z            1.47450774 +/-    0.0055
Ecliptic XDOT         0.00257668 +/-    0.0001
Ecliptic YDOT         0.00069593 +/-    0.0001
Ecliptic ZDOT         0.00046863 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.68128469 +/-    0.1394
Geocenter to KBO     40.89937622 +/-    0.1517
# Hcoef:  9.98

The following table shows the complete astrometric record for 20KF56. 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 (20KF56) followed by the observatory code and reference code for the source of the astrometry.

2020 05  28.44674  19 13 29.630  -20 16 57.05  26.4r 20KF56    266  C~6c5d      
2020 05  28.50129  19 13 29.425  -20 16 57.18  26.4r 20KF56    266  C~6c5d      
2020 05  28.55756  19 13 29.212  -20 16 57.31  26.4r 20KF56    266  C~6c5d      
2020 05  30.43935  19 13 22.160  -20 17 01.74  26.0r 20KF56    266  C~6c5d      
2020 05  30.53044  19 13 21.805  -20 17 01.98  26.0r 20KF56    266  C~6c5d      
2020 05  30.61862  19 13 21.460  -20 17 02.20  26.0r 20KF56    266  C~6c5d      
2020 06  01.43269  19 13 14.430  -20 17 06.93  26.1r 20KF56    266  C~6c5d      
2020 06  01.47325  19 13 14.267  -20 17 07.05  26.1r 20KF56    266  C~6c5d      
2020 06  01.60571  19 13 13.733  -20 17 07.41  26.1r 20KF56    266  C~6c5d      
2020 06  25.44823  19 11 25.555  -20 18 49.39  25.9r 20KF56    266  C~6c5d      
2020 06  25.53213  19 11 25.130  -20 18 49.85  25.9r 20KF56    266  C~6c5d      
2020 06  25.61487  19 11 24.712  -20 18 50.29  25.9r 20KF56    266  C~6c5d      
2020 08  14.24286  19 07 26.169  -20 24 05.05  26.2r 20KF56    266  C~6c5d      
2020 08  14.33285  19 07 25.808  -20 24 05.60  26.2r 20KF56    266  C~6c5d      
2020 08  14.42134  19 07 25.454  -20 24 06.11  26.2r 20KF56    266  C~6c5d      

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     0.03       0.00     0.02
     2   0.0001     -2.88     0.03       0.23     0.02
     3   0.0003     -5.87     0.03       0.48     0.02
     4   0.0055   -104.86     0.00       8.52    -0.04
     5   0.0057   -109.85     0.01       8.91    -0.04
     6   0.0059   -114.69     0.00       9.30    -0.05
     7   0.0109   -213.41    -0.04      16.99    -0.00
     8   0.0110   -215.70    -0.04      17.16    -0.00
     9   0.0114   -223.20    -0.04      17.74     0.00
    10   0.0767  -1746.06     0.01     104.82     0.03
    11   0.0769  -1752.05     0.01     105.10     0.03
    12   0.0771  -1757.94     0.01     105.38     0.03
    13   0.2130  -5127.19    -0.00     193.26    -0.01
    14   0.2132  -5132.30    -0.00     193.30    -0.01
    15   0.2135  -5137.30     0.00     193.38    -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.

20KF56    quality flag:1

Type:      CLASSICAL  SCATNEAR  SCATNEAR

axisobj        42.621    49.977    38.916
ecceobj         0.033     0.237     0.137
incobj         10.172     9.543    10.890
qmin           40.659    37.321    33.143
qmax           45.192    63.896    46.692
amean          42.845    50.345    39.447
amin           42.520    49.856    38.810
amax           43.180    50.924    40.168
emean           0.034     0.241     0.121
emin            0.021     0.227     0.070
emax            0.047     0.256     0.164
imean          11.884    11.167    11.830
imin           11.250    10.545     9.187
imax           12.466    11.756    14.329
excite_mean     0.209     0.309     0.239
fracstop        1.000     1.000     1.000
cjmean          3.035     3.060     2.988

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       175.8     174.9     185.4
kozaiamp        180.0     180.0     180.0