Orbit Fit and Astrometric record for 20KM54

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: 20KM54    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:  75.98d
# First observation: 2020/05/30
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000001   0.018598   0.000003  -0.002593   0.023426   0.000000
# Chi-squared of fit:     0.52 DOF:     30 RMS:  0.03
# Min/Max residuals:    -0.05    0.06
# Exact a, adot, b, bdot, g, gdot:
  1.578874E-05  2.455745E-02 -1.453266E-06 -2.587917E-03  2.442712E-02 -2.293075E-03
# Covariance matrix:
  3.0321E-13  8.7697E-11 -4.3204E-14 -2.1462E-13  1.7252E-11  4.5142E-10
  8.7697E-11  2.4463E-07 -1.2018E-10 -3.0113E-10  4.5168E-08  6.9721E-07
 -4.3204E-14 -1.2018E-10  2.3285E-13 -8.7800E-13 -2.2187E-11 -3.4174E-10
 -2.1462E-13 -3.0113E-10 -8.7800E-13  1.1850E-11 -5.6545E-11 -1.0735E-09
  1.7252E-11  4.5168E-08 -2.2187E-11 -5.6545E-11  8.3478E-09  1.3051E-07
  4.5142E-10  6.9721E-07 -3.4174E-10 -1.0735E-09  1.3051E-07  2.3926E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.027306  -72.974203    0.624498    0.027912   -0.792145  2458999.940151
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          318.31212 +/-    17.273
Argument of Peri:      215.80567 +/-    25.846
Long of Asc Node:      124.48710 +/-     0.359
Inclination:             6.30422 +/-     0.120
Eccentricity:         0.14408766 +/-    0.0372
Semi-Major Axis:     46.21890944 +/-    0.8775
Time of Perihelion: 2472280.8150 +/-    5493.6
Perihelion:          39.55933498 +/-    1.8751
Aphelion:            52.87848390 +/-    1.9899
Period (y)              314.2228 +/-      8.95
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.61987747 +/-    0.0448
Ecliptic Y          -40.06700013 +/-    0.1463
Ecliptic Z            1.44822856 +/-    0.0054
Ecliptic XDOT         0.00256774 +/-    0.0001
Ecliptic YDOT         0.00104527 +/-    0.0002
Ecliptic ZDOT        -0.00029920 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.74306431 +/-    0.1410
Geocenter to KBO     40.93810025 +/-    0.1531
# Hcoef: 10.10

The following table shows the complete astrometric record for 20KM54. 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 (20KM54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  30.43935  19 12 44.388  -20 20 36.92  26.2r 20KM54    266  C~6c5Z      
2020 05  30.53044  19 12 44.038  -20 20 37.50  26.2r 20KM54    266  C~6c5Z      
2020 05  30.61862  19 12 43.699  -20 20 38.04  26.2r 20KM54    266  C~6c5Z      
2020 06  01.43269  19 12 36.780  -20 20 49.48  26.3r 20KM54    266  C~6c5Z      
2020 06  01.47325  19 12 36.620  -20 20 49.75  26.3r 20KM54    266  C~6c5Z      
2020 06  01.60571  19 12 36.094  -20 20 50.61  26.3r 20KM54    266  C~6c5Z      
2020 06  21.45390  19 11 08.842  -20 23 24.90  25.9r 20KM54    266  C~6c5Z      
2020 06  21.53376  19 11 08.451  -20 23 25.61  25.9r 20KM54    266  C~6c5Z      
2020 06  21.61261  19 11 08.066  -20 23 26.29  25.9r 20KM54    266  C~6c5Z      
2020 06  24.43648  19 10 54.391  -20 23 51.87  26.3r 20KM54    266  C~6c5Z      
2020 06  24.51619  19 10 53.994  -20 23 52.60  26.3r 20KM54    266  C~6c5Z      
2020 06  24.59604  19 10 53.598  -20 23 53.31  26.3r 20KM54    266  C~6c5Z      
2020 08  12.26680  19 07 01.155  -20 31 59.05  26.5r 20KM54    266  C~6c5Z      
2020 08  12.34843  19 07 00.823  -20 31 59.84  26.5r 20KM54    266  C~6c5Z      
2020 08  12.42950  19 07 00.494  -20 32 00.61  26.5r 20KM54    266  C~6c5Z      
2020 08  14.24286  19 06 53.416  -20 32 17.93  26.2r 20KM54    266  C~6c5Z      
2020 08  14.33285  19 06 53.061  -20 32 18.79  26.2r 20KM54    266  C~6c5Z      
2020 08  14.42134  19 06 52.713  -20 32 19.62  26.2r 20KM54    266  C~6c5Z      

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    -0.05
     2   0.0002     -4.96     0.02       0.04    -0.05
     3   0.0005     -9.75     0.02       0.09    -0.05
     4   0.0055   -107.73    -0.02       0.82     0.03
     5   0.0056   -110.00    -0.02       0.83     0.03
     6   0.0059   -117.45    -0.02       0.89     0.03
     7   0.0603  -1354.07    -0.02      -1.42     0.06
     8   0.0605  -1359.61    -0.02      -1.45     0.06
     9   0.0607  -1365.07    -0.02      -1.47     0.06
    10   0.0684  -1559.03     0.02      -3.47    -0.04
    11   0.0687  -1564.66     0.02      -3.52    -0.04
    12   0.0689  -1570.27     0.03      -3.55    -0.04
    13   0.2021  -4872.26     0.00     -98.78    -0.00
    14   0.2024  -4876.99    -0.00     -99.03    -0.00
    15   0.2026  -4881.67    -0.01     -99.26    -0.00
    16   0.2075  -4982.49     0.01    -104.99    -0.00
    17   0.2078  -4987.54     0.00    -105.27     0.00
    18   0.2080  -4992.50     0.00    -105.53    -0.00

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.

20KM54    quality flag:1

Type:      CLASSICAL  SCATNEAR  SCATNEAR

axisobj        45.617    51.784    42.801
ecceobj         0.140     0.216     0.210
incobj          6.318     5.959     6.672
qmin           38.686    40.084    33.084
qmax           53.369    64.697    53.826
amean          45.837    52.118    43.336
amin           45.452    51.635    42.323
amax           46.273    52.698    43.904
emean           0.141     0.218     0.191
emin            0.126     0.207     0.160
emax            0.154     0.228     0.229
imean           4.962     4.495     7.674
imin            4.458     4.211     2.600
imax            5.537     4.790    10.965
excite_mean     0.165     0.232     0.237
fracstop        1.000     1.000     1.000
cjmean          3.091     3.138     3.025

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       182.2     183.8     183.2
kozaiamp        180.0     179.9     179.9