Orbit Fit and Astrometric record for 20KE56

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: 20KE56    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:  74.98d
# First observation: 2020/05/30
#  Last observation: 2020/08/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000002   0.018604   0.000007  -0.002787   0.025003   0.000000
# Chi-squared of fit:     0.03 DOF:     24 RMS:  0.01
# Min/Max residuals:    -0.02    0.02
# Exact a, adot, b, bdot, g, gdot:
  1.569979E-05  2.601003E-02 -1.695300E-06 -2.781518E-03  2.627591E-02  4.402454E-03
# Covariance matrix:
  5.4399E-13  1.1348E-10 -1.0957E-13 -3.0903E-13  2.3011E-11  6.6743E-10
  1.1348E-10  2.2758E-07 -2.1607E-10 -2.6427E-10  4.2488E-08  7.0062E-07
 -1.0957E-13 -2.1607E-10  4.3577E-13 -1.4378E-12 -4.0345E-11 -6.6552E-10
 -3.0903E-13 -2.6427E-10 -1.4378E-12  2.1838E-11 -5.0378E-11 -1.0286E-09
  2.3011E-11  4.2488E-08 -4.0345E-11 -5.0378E-11  7.9420E-09  1.3266E-07
  6.6743E-10  7.0062E-07 -6.6552E-10 -1.0286E-09  1.3266E-07  2.5407E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.505019  -72.411080    0.632258    0.034246   -0.785715  2458999.940151
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           77.83891 +/-    14.735
Argument of Peri:       62.73381 +/-    12.004
Long of Asc Node:      128.73932 +/-     0.388
Inclination:             6.50322 +/-     0.109
Eccentricity:         0.14959411 +/-    0.0582
Semi-Major Axis:     39.22192280 +/-    1.6268
Time of Perihelion: 2439591.2036 +/-    3468.4
Perihelion:          33.35455427 +/-    2.6693
Aphelion:            45.08929134 +/-    2.9511
Period (y)              245.6414 +/-     15.28
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.13005336 +/-    0.0390
Ecliptic Y          -37.19137688 +/-    0.1229
Ecliptic Z            1.66338889 +/-    0.0057
Ecliptic XDOT         0.00273387 +/-    0.0001
Ecliptic YDOT         0.00037360 +/-    0.0001
Ecliptic ZDOT        -0.00026973 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.85670424 +/-    0.1182
Geocenter to KBO     38.05767088 +/-    0.1291
# Hcoef:  9.19

The following table shows the complete astrometric record for 20KE56. 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 (20KE56) followed by the observatory code and reference code for the source of the astrometry.

2020 05  30.43935  19 14 51.640  -19 47 55.65  24.8r 20KE56    266  C~6c5d      
2020 05  30.53044  19 14 51.268  -19 47 56.24  24.8r 20KE56    266  C~6c5d      
2020 05  30.61862  19 14 50.906  -19 47 56.79  24.8r 20KE56    266  C~6c5d      
2020 06  20.45583  19 13 14.611  -19 50 43.01  25.1r 20KE56    266  C~6c5d      
2020 06  20.52860  19 13 14.232  -19 50 43.69  25.1r 20KE56    266  C~6c5d      
2020 06  20.62233  19 13 13.744  -19 50 44.55  25.1r 20KE56    266  C~6c5d      
2020 06  22.44948  19 13 04.350  -19 51 02.00  25.1r 20KE56    266  C~6c5d      
2020 06  22.52092  19 13 03.974  -19 51 02.69  25.1r 20KE56    266  C~6c5d      
2020 06  22.59118  19 13 03.603  -19 51 03.35  25.1r 20KE56    266  C~6c5d      
2020 06  25.44823  19 12 48.687  -19 51 31.42  24.8r 20KE56    266  C~6c5d      
2020 06  25.53213  19 12 48.237  -19 51 32.26  24.8r 20KE56    266  C~6c5d      
2020 06  25.61487  19 12 47.795  -19 51 33.06  24.8r 20KE56    266  C~6c5d      
2020 08  13.24332  19 08 39.056  -20 00 33.43  25.2r 20KE56    266  C~6c5d      
2020 08  13.33331  19 08 38.667  -20 00 34.42  25.2r 20KE56    266  C~6c5d      
2020 08  13.42301  19 08 38.280  -20 00 35.39  25.2r 20KE56    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    -0.01       0.00     0.00
     2   0.0002     -5.28     0.00       0.09     0.00
     3   0.0005    -10.42     0.00       0.19     0.00
     4   0.0575  -1379.39     0.00       7.28    -0.00
     5   0.0577  -1384.78     0.01       7.28    -0.00
     6   0.0580  -1391.72    -0.00       7.29     0.00
     7   0.0630  -1525.41     0.01       6.58     0.00
     8   0.0632  -1530.76     0.02       6.56     0.00
     9   0.0634  -1536.04     0.01       6.56     0.01
    10   0.0712  -1748.35    -0.01       5.00    -0.00
    11   0.0714  -1754.75    -0.02       4.95    -0.01
    12   0.0717  -1761.04    -0.01       4.94    -0.01
    13   0.2048  -5309.39     0.00    -104.69     0.00
    14   0.2050  -5314.95    -0.00    -105.03     0.00
    15   0.2053  -5320.49    -0.00    -105.34     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.

20KE56    quality flag:1

Type:       SCATNEAR  CENTAURR  CENTAURR

axisobj        38.719    46.731    34.584
ecceobj         0.147     0.315     0.150
incobj          6.517     6.180     6.911
qmin           32.387    29.997    29.351
qmax           45.480    74.783    41.937
amean          38.316    45.180    35.102
amin           37.546    35.082    34.554
amax           39.421    53.311    35.889
emean           0.116     0.291     0.156
emin            0.077     0.115     0.141
emax            0.161     0.405     0.169
imean           5.218     4.564     5.340
imin            3.681     2.338     5.146
imax            6.743     6.575     5.448
excite_mean     0.148     0.302     0.182
fracstop        1.000     0.439     0.002
cjmean          3.017     3.001     2.983

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       182.3     182.1     350.5
kozaiamp        180.0     179.9       6.5