Orbit Fit and Astrometric record for 20KU54

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: 20KU54    
# Created Tue Apr  1 01:11:19 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:
   0.000001   0.023232   0.000003   0.003178   0.025695   0.000000
# Chi-squared of fit:     2.47 DOF:     24 RMS:  0.07
# Min/Max residuals:    -0.13    0.10
# Exact a, adot, b, bdot, g, gdot:
  1.659643E-05  2.870777E-02  1.426774E-06  3.166508E-03  2.660687E-02  1.970175E-04
# Covariance matrix:
  3.0113E-13  8.6610E-11 -5.5276E-14  2.3988E-13  1.7421E-11  5.0100E-10
  8.6610E-11  2.7423E-07 -1.5814E-10  3.1013E-10  5.1545E-08  9.3310E-07
 -5.5276E-14 -1.5814E-10  2.6624E-13 -1.3603E-12 -2.9769E-11 -5.4768E-10
  2.3988E-13  3.1013E-10 -1.3603E-12  1.8396E-11  5.9613E-11  1.3449E-09
  1.7421E-11  5.1545E-08 -2.9769E-11  5.9613E-11  9.6977E-09  1.7729E-07
  5.0100E-10  9.3310E-07 -5.4768E-10  1.3449E-09  1.7729E-07  3.5918E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.158053  -72.017332    0.637647    0.029323   -0.781548  2458999.940151
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          356.82003 +/-    21.009
Argument of Peri:       22.90210 +/-    28.566
Long of Asc Node:      268.58339 +/-     0.321
Inclination:             6.65073 +/-     0.110
Eccentricity:         0.15267667 +/-    0.0257
Semi-Major Axis:     45.27761599 +/-    1.4207
Time of Perihelion: 2459973.4802 +/-    6494.2
Perihelion:          38.36478056 +/-    1.6747
Aphelion:            52.19045142 +/-    2.0093
Period (y)              304.6727 +/-     14.34
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.23572610 +/-    0.0429
Ecliptic Y          -36.67052127 +/-    0.1322
Ecliptic Z            1.41540589 +/-    0.0052
Ecliptic XDOT         0.00282031 +/-    0.0001
Ecliptic YDOT         0.00090796 +/-    0.0002
Ecliptic ZDOT         0.00032613 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.37931793 +/-    0.1270
Geocenter to KBO     37.58428300 +/-    0.1391
# Hcoef: 10.73

The following table shows the complete astrometric record for 20KU54. 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 (20KU54) followed by the observatory code and reference code for the source of the astrometry.

2020 05  30.43935  19 16 42.694  -20 05 31.18  26.5r 20KU54    266  C~6c5a      
2020 05  30.53044  19 16 42.325  -20 05 31.50  26.5r 20KU54    266  C~6c5a      
2020 05  30.61862  19 16 41.966  -20 05 31.79  26.5r 20KU54    266  C~6c5a      
2020 06  01.43269  19 16 34.642  -20 05 38.39  26.5r 20KU54    266  C~6c5a      
2020 06  01.47325  19 16 34.472  -20 05 38.55  26.5r 20KU54    266  C~6c5a      
2020 06  01.60571  19 16 33.915  -20 05 39.04  26.5r 20KU54    266  C~6c5a      
2020 06  20.45583  19 15 06.100  -20 07 14.92  26.4r 20KU54    266  C~6c5a      
2020 06  20.52860  19 15 05.722  -20 07 15.38  26.4r 20KU54    266  C~6c5a      
2020 06  20.62233  19 15 05.235  -20 07 15.95  26.4r 20KU54    266  C~6c5a      
2020 06  22.44948  19 14 55.844  -20 07 27.79  26.4r 20KU54    266  C~6c5a      
2020 06  22.52092  19 14 55.467  -20 07 28.26  26.4r 20KU54    266  C~6c5a      
2020 06  22.59118  19 14 55.097  -20 07 28.71  26.4r 20KU54    266  C~6c5a      
2020 08  13.24332  19 10 29.488  -20 14 11.38  26.7r 20KU54    266  C~6c5a      
2020 08  13.33331  19 10 29.096  -20 14 12.06  26.7r 20KU54    266  C~6c5a      
2020 08  13.42301  19 10 28.706  -20 14 12.73  26.7r 20KU54    266  C~6c5a      

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     0.10       0.00     0.09
     2   0.0002     -5.20     0.10       0.36     0.09
     3   0.0005    -10.25     0.10       0.74     0.09
     4   0.0055   -113.40    -0.11       7.67    -0.13
     5   0.0056   -115.79    -0.11       7.83    -0.13
     6   0.0059   -123.64    -0.12       8.37    -0.13
     7   0.0575  -1362.60     0.02      73.42     0.03
     8   0.0577  -1367.94     0.03      73.65     0.03
     9   0.0580  -1374.81     0.03      73.97     0.03
    10   0.0630  -1507.51    -0.01      79.19     0.02
    11   0.0632  -1512.84    -0.01      79.40     0.02
    12   0.0634  -1518.07    -0.01      79.62     0.02
    13   0.2048  -5279.75     0.01     146.80    -0.01
    14   0.2050  -5285.31    -0.00     146.79    -0.01
    15   0.2053  -5290.85    -0.01     146.79    -0.01

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.

20KU54    quality flag:1

Type:      CLASSICAL    5:2EEE  SCATNEAR

axisobj        44.622    54.866    40.429
ecceobj         0.142     0.344     0.158
incobj          6.687     6.332     7.083
qmin           37.526    35.321    33.199
qmax           52.581    76.731    48.565
amean          44.871    55.463    40.647
amin           44.501    54.731    40.206
amax           45.285    56.379    41.169
emean           0.145     0.341     0.154
emin            0.129     0.314     0.125
emax            0.161     0.363     0.181
imean           8.493     9.326    13.512
imin            7.770     7.717     8.560
imax            9.141    11.524    16.231
excite_mean     0.207     0.378     0.280
fracstop        1.000     1.000     1.000
cjmean          3.060     3.060     2.971

libcent 0      -180.0     180.2    -180.0
libamp  0      -180.0     109.0    -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       177.7      61.0     179.1
kozaiamp        180.0     180.0     180.0