Orbit Fit and Astrometric record for 20KC55

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: 20KC55    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:  76.97d
# First observation: 2020/05/29
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000001   0.016748   0.000004   0.000073   0.022241   0.000000
# Chi-squared of fit:     0.62 DOF:     30 RMS:  0.03
# Min/Max residuals:    -0.05    0.05
# Exact a, adot, b, bdot, g, gdot:
  1.496140E-05  2.156529E-02 -6.518961E-08  7.296681E-05  2.304421E-02 -2.312148E-03
# Covariance matrix:
  2.8809E-13  4.8541E-11 -3.9083E-14  2.1781E-14  1.0029E-11  3.4919E-10
  4.8541E-11  1.3595E-07 -1.0021E-10  2.7303E-11  2.5220E-08  4.1878E-07
 -3.9083E-14 -1.0021E-10  2.4935E-13 -1.0434E-12 -1.8614E-11 -3.1400E-10
  2.1781E-14  2.7303E-11 -1.0434E-12  1.1122E-11  5.1695E-12  1.0867E-10
  1.0029E-11  2.5220E-08 -1.8614E-11  5.1695E-12  4.6862E-09  7.9423E-08
  3.4919E-10  4.1878E-07 -3.1400E-10  1.0867E-10  7.9423E-08  1.6982E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.743547  -73.061234    0.636417    0.037353   -0.782157  2458998.947781
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          276.14925 +/-    10.952
Argument of Peri:      182.96175 +/-     9.320
Long of Asc Node:      200.84581 +/-     0.190
Inclination:             2.70344 +/-     0.001
Eccentricity:         0.12088655 +/-    0.0607
Semi-Major Axis:     44.12009772 +/-    0.5599
Time of Perihelion: 2483922.5251 +/-    3221.8
Perihelion:          38.78657153 +/-    2.7248
Aphelion:            49.45362390 +/-    2.7524
Period (y)              293.0643 +/-      5.58
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.25355617 +/-    0.0375
Ecliptic Y          -42.40598706 +/-    0.1232
Ecliptic Z            2.07718883 +/-    0.0062
Ecliptic XDOT         0.00237904 +/-    0.0001
Ecliptic YDOT         0.00101291 +/-    0.0001
Ecliptic ZDOT        -0.00000472 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.18972834 +/-    0.1187
Geocenter to KBO     43.39484120 +/-    0.1289
# Hcoef:  9.87

The following table shows the complete astrometric record for 20KC55. 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 (20KC55) followed by the observatory code and reference code for the source of the astrometry.

2020 05  29.44698  19 11 59.735  -19 38 36.94  26.3r 20KC55    266  C~6c5b      
2020 05  29.53371  19 11 59.420  -19 38 37.27  26.3r 20KC55    266  C~6c5b      
2020 05  29.61905  19 11 59.109  -19 38 37.58  26.3r 20KC55    266  C~6c5b      
2020 05  31.44139  19 11 52.535  -19 38 44.72  26.1r 20KC55    266  C~6c5b      
2020 05  31.52961  19 11 52.204  -19 38 45.09  26.1r 20KC55    266  C~6c5b      
2020 05  31.61814  19 11 51.871  -19 38 45.44  26.1r 20KC55    266  C~6c5b      
2020 06  21.45390  19 10 24.571  -19 40 39.20  26.1r 20KC55    266  C~6c5b      
2020 06  21.53376  19 10 24.197  -19 40 39.73  26.1r 20KC55    266  C~6c5b      
2020 06  21.61261  19 10 23.829  -19 40 40.25  26.1r 20KC55    266  C~6c5b      
2020 06  24.43648  19 10 10.759  -19 40 59.58  26.3r 20KC55    266  C~6c5b      
2020 06  24.51759  19 10 10.373  -19 41 00.15  26.3r 20KC55    266  C~6c5b      
2020 06  24.59884  19 10 09.988  -19 41 00.70  26.3r 20KC55    266  C~6c5b      
2020 08  12.26680  19 06 28.132  -19 47 41.20  26.6r 20KC55    266  C~6c5b      
2020 08  12.34843  19 06 27.815  -19 47 41.89  26.6r 20KC55    266  C~6c5b      
2020 08  12.42950  19 06 27.500  -19 47 42.55  26.6r 20KC55    266  C~6c5b      
2020 08  14.24286  19 06 20.726  -19 47 57.58  26.1r 20KC55    266  C~6c5b      
2020 08  14.33285  19 06 20.387  -19 47 58.33  26.1r 20KC55    266  C~6c5b      
2020 08  14.42134  19 06 20.054  -19 47 59.05  26.1r 20KC55    266  C~6c5b      

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   0.0002     -4.46    -0.03       0.22     0.03
     3   0.0005     -8.86    -0.03       0.45     0.03
     4   0.0055   -101.90     0.04       4.79    -0.04
     5   0.0057   -106.58     0.04       4.99    -0.04
     6   0.0059   -111.30     0.04       5.22    -0.04
     7   0.0630  -1349.14    -0.04      42.51    -0.03
     8   0.0632  -1354.45    -0.05      42.63    -0.02
     9   0.0634  -1359.67    -0.05      42.74    -0.03
    10   0.0712  -1545.26     0.04      45.80     0.04
    11   0.0714  -1550.74     0.03      45.89     0.04
    12   0.0716  -1556.21     0.04      46.00     0.05
    13   0.2048  -4714.66     0.02      16.91     0.02
    14   0.2051  -4719.18     0.02      16.74     0.01
    15   0.2053  -4723.68     0.01      16.59     0.02
    16   0.2103  -4820.43    -0.02      12.64    -0.02
    17   0.2105  -4825.27    -0.02      12.45    -0.02
    18   0.2107  -4830.02    -0.02      12.27    -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.

20KC55    quality flag:1

Type:       SCATNEAR CLASSICAL  SCATNEAR

axisobj        43.618    47.109    41.778
ecceobj         0.125     0.080     0.197
incobj          2.710     2.709     2.711
qmin           37.032    42.761    33.330
qmax           50.931    52.208    50.859
amean          43.726    47.362    41.587
amin           43.252    46.978    40.969
amax           44.213    47.798    42.299
emean           0.137     0.079     0.171
emin            0.109     0.065     0.139
emax            0.152     0.093     0.202
imean           4.402     3.499     2.812
imin            3.203     3.201     0.137
imax            5.254     3.812     4.854
excite_mean     0.157     0.100     0.180
fracstop        1.000     1.000     1.000
cjmean          3.068     3.131     3.037

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       178.2     180.0     172.4
kozaiamp        180.0     180.0     180.0