Orbit Fit and Astrometric record for 20KY55

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: 20KY55    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:  78.97d
# First observation: 2020/05/28
#  Last observation: 2020/08/15
Preliminary a, adot, b, bdot, g, gdot:
   0.000001   0.020942   0.000006   0.001327   0.024831   0.000000
# Chi-squared of fit:     0.34 DOF:     36 RMS:  0.02
# Min/Max residuals:    -0.04    0.04
# Exact a, adot, b, bdot, g, gdot:
  1.691616E-05  2.800678E-02  7.778053E-07  1.326191E-03  2.603635E-02  2.480517E-03
# Covariance matrix:
  2.7426E-13  2.8577E-11 -2.6475E-14  8.9440E-14  6.3404E-12  2.5700E-10
  2.8577E-11  1.2603E-07 -9.7428E-11  1.3385E-10  2.3674E-08  3.9320E-07
 -2.6475E-14 -9.7428E-11  2.3122E-13 -1.0531E-12 -1.8329E-11 -3.0937E-10
  8.9440E-14  1.3385E-10 -1.0531E-12  1.0593E-11  2.5559E-11  5.0347E-10
  6.3404E-12  2.3674E-08 -1.8329E-11  2.5559E-11  4.4531E-09  7.5039E-08
  2.5700E-10  3.9320E-07 -3.0937E-10  5.0347E-10  7.5039E-08  1.4705E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.136007  -72.478991    0.657282    0.028406   -0.765035  2458997.947541
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           18.68960 +/-     7.198
Argument of Peri:       10.33992 +/-    10.996
Long of Asc Node:      249.14895 +/-     0.345
Inclination:             3.44329 +/-     0.027
Eccentricity:         0.18101161 +/-    0.0415
Semi-Major Axis:     47.04091740 +/-    1.4928
Time of Perihelion: 2452872.4976 +/-    2338.2
Perihelion:          38.52596542 +/-    2.3051
Aphelion:            55.55586937 +/-    2.6319
Period (y)              322.6427 +/-     15.36
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.16418527 +/-    0.0296
Ecliptic Y          -37.53528834 +/-    0.0938
Ecliptic Z            1.43162668 +/-    0.0037
Ecliptic XDOT         0.00289345 +/-    0.0001
Ecliptic YDOT         0.00064655 +/-    0.0001
Ecliptic ZDOT         0.00014885 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.18655967 +/-    0.0903
Geocenter to KBO     38.40784394 +/-    0.0984
# Hcoef: 10.01

The following table shows the complete astrometric record for 20KY55. 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 (20KY55) followed by the observatory code and reference code for the source of the astrometry.

2020 05  28.44674  19 14 46.484  -20 10 24.41  26.0r 20KY55    266  C~6c5c      
2020 05  28.50129  19 14 46.273  -20 10 24.63  26.0r 20KY55    266  C~6c5c      
2020 05  28.55756  19 14 46.055  -20 10 24.85  26.0r 20KY55    266  C~6c5c      
2020 05  30.43935  19 14 38.825  -20 10 32.41  26.3r 20KY55    266  C~6c5c      
2020 05  30.53044  19 14 38.460  -20 10 32.81  26.3r 20KY55    266  C~6c5c      
2020 05  30.61862  19 14 38.106  -20 10 33.17  26.3r 20KY55    266  C~6c5c      
2020 06  20.45583  19 13 03.776  -20 12 32.30  26.1r 20KY55    266  C~6c5c      
2020 06  20.52860  19 13 03.404  -20 12 32.81  26.1r 20KY55    266  C~6c5c      
2020 06  20.62233  19 13 02.926  -20 12 33.45  26.1r 20KY55    266  C~6c5c      
2020 06  22.44948  19 12 53.714  -20 12 46.51  25.6r 20KY55    266  C~6c5c      
2020 06  22.52092  19 12 53.344  -20 12 47.03  25.6r 20KY55    266  C~6c5c      
2020 06  22.59118  19 12 52.981  -20 12 47.52  25.6r 20KY55    266  C~6c5c      
2020 06  25.44823  19 12 38.346  -20 13 08.70  25.9r 20KY55    266  C~6c5c      
2020 06  25.53213  19 12 37.904  -20 13 09.32  25.9r 20KY55    266  C~6c5c      
2020 06  25.61487  19 12 37.471  -20 13 09.93  25.9r 20KY55    266  C~6c5c      
2020 08  13.24332  19 08 33.607  -20 20 01.28  25.9r 20KY55    266  C~6c5c      
2020 08  13.33331  19 08 33.227  -20 20 02.02  25.9r 20KY55    266  C~6c5c      
2020 08  13.42301  19 08 32.849  -20 20 02.73  25.9r 20KY55    266  C~6c5c      
2020 08  15.24331  19 08 25.466  -20 20 17.40  25.3r 20KY55    266  C~6c5c      
2020 08  15.33985  19 08 25.071  -20 20 18.18  25.3r 20KY55    266  C~6c5c      
2020 08  15.42111  19 08 24.739  -20 20 18.81  25.3r 20KY55    266  C~6c5c      

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     0.02       0.00     0.01
     2   0.0001     -2.97     0.01       0.16     0.01
     3   0.0003     -6.05     0.01       0.33     0.01
     4   0.0055   -107.98    -0.02       5.81    -0.01
     5   0.0057   -113.12    -0.02       6.07    -0.01
     6   0.0059   -118.11    -0.02       6.35    -0.01
     7   0.0630  -1450.54    -0.00      55.76    -0.02
     8   0.0632  -1455.80    -0.00      55.91    -0.02
     9   0.0635  -1462.56    -0.00      56.11    -0.02
    10   0.0685  -1592.85     0.04      59.35     0.01
    11   0.0686  -1598.08     0.03      59.49     0.01
    12   0.0688  -1603.21     0.04      59.64     0.01
    13   0.0767  -1810.26    -0.03      64.28     0.01
    14   0.0769  -1816.51    -0.04      64.44     0.02
    15   0.0771  -1822.64    -0.03      64.59     0.01
    16   0.2103  -5279.58     0.02      72.57     0.04
    17   0.2105  -5284.97     0.02      72.47     0.04
    18   0.2107  -5290.34     0.02      72.39     0.04
    19   0.2157  -5395.26    -0.02      70.09    -0.04
    20   0.2160  -5400.87    -0.02      69.98    -0.04
    21   0.2162  -5405.59    -0.02      69.90    -0.04

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.

20KY55    quality flag:1

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        46.311    54.005    41.906
ecceobj         0.169     0.326     0.058
incobj          3.464     3.376     3.563
qmin           37.858    35.813    35.977
qmax           55.684    74.092    48.735
amean          46.590    54.354    42.134
amin           46.188    53.635    41.772
amax           47.056    55.237    42.543
emean           0.170     0.328     0.091
emin            0.156     0.314     0.042
emax            0.184     0.341     0.146
imean           5.208     4.941     5.906
imin            4.526     4.238     3.447
imax            5.876     5.545     7.783
excite_mean     0.193     0.339     0.138
fracstop        1.000     1.000     1.000
cjmean          3.087     3.083     3.055

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       172.3     178.9     178.0
kozaiamp        180.0     180.0     180.0