Orbit Fit and Astrometric record for 20KB55

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: 20KB55    
# Created Thu Apr  3 01:11:24 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   0.014570   0.000003  -0.006783   0.021444   0.000000
# Chi-squared of fit:     0.25 DOF:     30 RMS:  0.02
# Min/Max residuals:    -0.05    0.05
# Exact a, adot, b, bdot, g, gdot:
  1.431521E-05  2.030397E-02 -4.764082E-06 -6.775776E-03  2.241878E-02 -7.207193E-05
# Covariance matrix:
  3.0412E-13  7.8829E-11 -4.3787E-14 -6.2172E-13  1.5617E-11  4.4414E-10
  7.8829E-11  1.8647E-07 -1.1098E-10 -7.7170E-10  3.4526E-08  5.6972E-07
 -4.3787E-14 -1.1098E-10  2.4163E-13 -5.7538E-13 -2.0518E-11 -3.3118E-10
 -6.2172E-13 -7.7170E-10 -5.7538E-13  1.5216E-11 -1.4545E-10 -2.9747E-09
  1.5617E-11  3.4526E-08 -2.0518E-11 -1.4545E-10  6.4003E-09  1.0725E-07
  4.4414E-10  5.6972E-07 -3.3118E-10 -2.9747E-09  1.0725E-07  2.1646E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.586566  -73.387009    0.631955    0.035373   -0.785859  2458998.947781
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          344.16325 +/-    67.995
Argument of Peri:      189.72839 +/-    76.644
Long of Asc Node:      113.42522 +/-     0.162
Inclination:            18.53414 +/-     0.374
Eccentricity:         0.05765696 +/-    0.0135
Semi-Major Axis:     48.05690803 +/-    1.2888
Time of Perihelion: 2464343.4820 +/-   22982.0
Perihelion:          45.28609277 +/-    1.3758
Aphelion:            50.82772328 +/-    1.5086
Period (y)              333.1516 +/-     13.40
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.36493930 +/-    0.0455
Ecliptic Y          -43.64134616 +/-    0.1524
Ecliptic Z            2.01284783 +/-    0.0072
Ecliptic XDOT         0.00239236 +/-    0.0001
Ecliptic YDOT         0.00068512 +/-    0.0002
Ecliptic ZDOT        -0.00082727 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.40385859 +/-    0.1470
Geocenter to KBO     44.60547009 +/-    0.1592
# Hcoef:  9.70

The following table shows the complete astrometric record for 20KB55. 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 (20KB55) followed by the observatory code and reference code for the source of the astrometry.

2020 05  29.44698  19 10 42.259  -19 50 20.75  26.0r 20KB55    266  C~6c5a      
2020 05  29.53511  19 10 41.946  -19 50 21.43  26.0r 20KB55    266  C~6c5a      
2020 05  29.61905  19 10 41.647  -19 50 22.06  26.0r 20KB55    266  C~6c5a      
2020 05  31.44139  19 10 35.215  -19 50 36.16  26.2r 20KB55    266  C~6c5a      
2020 05  31.52961  19 10 34.892  -19 50 36.87  26.2r 20KB55    266  C~6c5b      
2020 05  31.61814  19 10 34.566  -19 50 37.56  26.2r 20KB55    266  C~6c5b      
2020 06  21.45390  19 09 09.394  -19 53 49.80  26.2r 20KB55    266  C~6c5b      
2020 06  21.53376  19 09 09.030  -19 53 50.63  26.2r 20KB55    266  C~6c5b      
2020 06  21.61261  19 09 08.671  -19 53 51.43  26.2r 20KB55    266  C~6c5b      
2020 06  24.43648  19 08 55.925  -19 54 21.23  26.2r 20KB55    266  C~6c5b      
2020 06  24.52599  19 08 55.511  -19 54 22.18  26.2r 20KB55    266  C~6c5b      
2020 06  24.61708  19 08 55.090  -19 54 23.13  26.2r 20KB55    266  C~6c5b      
2020 08  12.26680  19 05 19.608  -20 03 53.63  26.4r 20KB55    266  C~6c5b      
2020 08  12.34843  19 05 19.301  -20 03 54.59  26.4r 20KB55    266  C~6c5b      
2020 08  12.42950  19 05 18.997  -20 03 55.53  26.4r 20KB55    266  C~6c5b      
2020 08  14.24286  19 05 12.435  -20 04 16.60  26.2r 20KB55    266  C~6c5b      
2020 08  14.33285  19 05 12.107  -20 04 17.65  26.2r 20KB55    266  C~6c5b      
2020 08  14.42134  19 05 11.784  -20 04 18.66  26.2r 20KB55    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     0.00       0.00    -0.00
     2   0.0002     -4.47     0.00      -0.14    -0.00
     3   0.0005     -8.73     0.00      -0.26    -0.00
     4   0.0055   -100.52    -0.01      -3.29     0.00
     5   0.0057   -105.13    -0.00      -3.44    -0.00
     6   0.0059   -109.78    -0.01      -3.57     0.00
     7   0.0630  -1325.69     0.04     -50.65    -0.00
     8   0.0632  -1330.88     0.05     -50.86    -0.00
     9   0.0634  -1336.01     0.04     -51.06    -0.00
    10   0.0712  -1518.05    -0.05     -59.35     0.00
    11   0.0714  -1523.96    -0.04     -59.61     0.01
    12   0.0716  -1529.97    -0.04     -59.85     0.01
    13   0.2048  -4613.88     0.02    -275.38     0.00
    14   0.2051  -4618.29     0.02    -275.84    -0.00
    15   0.2053  -4622.65     0.03    -276.29    -0.01
    16   0.2103  -4716.94    -0.02    -286.80     0.00
    17   0.2105  -4721.65    -0.02    -287.32    -0.00
    18   0.2107  -4726.29    -0.03    -287.81     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.

20KB55    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATEXTD

axisobj        47.444    54.869    44.255
ecceobj         0.049     0.234     0.160
incobj         18.602    17.490    19.829
qmin           42.801    41.146    36.805
qmax           53.304    69.961    52.397
amean          47.798    55.279    44.427
amin           47.310    54.705    44.045
amax           48.314    55.939    44.845
emean           0.056     0.236     0.152
emin            0.023     0.222     0.137
emax            0.105     0.253     0.170
imean          16.916    15.951    18.351
imin           16.517    15.472    17.794
imax           17.223    16.322    18.843
excite_mean     0.297     0.362     0.350
fracstop        1.000     1.000     1.000
cjmean          3.037     3.077     2.957

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       174.4     193.0     184.0
kozaiamp        180.0     180.0     179.9