Orbit Fit and Astrometric record for 20KD53

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: 20KD53    
# Created Tue Apr  1 01:11:19 2025
# Orbit generated from Bernstein formalism
# Fitting     24 observations of     24
# Arc:   1.28y
# First observation: 2020/05/26
#  Last observation: 2021/09/05
Preliminary a, adot, b, bdot, g, gdot:
   0.000024   0.037210  -0.000003  -0.010048   0.028942   0.000000
# Chi-squared of fit:     1.05 DOF:     42 RMS:  0.04
# Min/Max residuals:    -0.07    0.07
# Exact a, adot, b, bdot, g, gdot:
  2.010620E-05  3.680877E-02 -5.568964E-06 -9.981612E-03  2.860598E-02 -4.561739E-03
# Covariance matrix:
  1.9235E-13  7.4582E-13  8.0491E-15 -2.8281E-13  6.8025E-13  2.3630E-11
  7.4582E-13  8.4316E-12  8.3788E-14 -2.8789E-12  6.4136E-12  2.4047E-10
  8.0491E-15  8.3788E-14  1.0391E-13 -1.2406E-13  6.1887E-14  2.5680E-12
 -2.8281E-13 -2.8789E-12 -1.2406E-13  1.2441E-12 -2.1696E-12 -8.6745E-11
  6.8025E-13  6.4136E-12  6.1887E-14 -2.1696E-12  5.1803E-12  1.8127E-10
  2.3630E-11  2.4047E-10  2.5680E-12 -8.6745E-11  1.8127E-10  7.2440E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.943155  -73.785762    0.665525    0.025584   -0.757849  2458995.943811
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          356.69063 +/-     0.049
Argument of Peri:      192.74207 +/-     0.301
Long of Asc Node:      112.13942 +/-     0.000
Inclination:            15.26061 +/-     0.001
Eccentricity:         0.64796074 +/-    0.0012
Semi-Major Axis:     99.09159364 +/-    0.2758
Time of Perihelion: 2462302.5476 +/-      46.8
Perihelion:          34.88413099 +/-    0.1547
Aphelion:           163.29905628 +/-    0.4702
Period (y)              986.4235 +/-      4.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            9.33398554 +/-    0.0008
Ecliptic Y          -34.46876358 +/-    0.0027
Ecliptic Z            1.18522121 +/-    0.0001
Ecliptic XDOT         0.00327813 +/-    0.0000
Ecliptic YDOT         0.00137510 +/-    0.0000
Ecliptic ZDOT        -0.00096982 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.72987123 +/-    0.0026
Geocenter to KBO     34.95772637 +/-    0.0028
# Hcoef:  9.98

The following table shows the complete astrometric record for 20KD53. 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 (20KD53) followed by the observatory code and reference code for the source of the astrometry.

2020 05  26.44301  19 09 20.812  -20 31 32.13  25.4r 20KD53    266  C~7ulo      
2020 05  26.50149  19 09 20.583  -20 31 32.72  25.4r 20KD53    266  C~7ulo      
2020 05  26.55599  19 09 20.370  -20 31 33.26  25.4r 20KD53    266  C~7ulo      
2020 05  29.44698  19 09 09.006  -20 32 02.36  25.5r 20KD53    266  C~6VL9      
2020 05  29.53371  19 09 08.647  -20 32 03.27  25.5r 20KD53    266  C~6VL9      
2020 05  29.61905  19 09 08.292  -20 32 04.14  25.5r 20KD53    266  C~6VL9      
2020 05  31.44139  19 09 00.788  -20 32 23.29  25.6r 20KD53    266  C~6VL9      
2020 05  31.52961  19 09 00.409  -20 32 24.25  25.6r 20KD53    266  C~6VL9      
2020 05  31.61814  19 09 00.028  -20 32 25.18  25.6r 20KD53    266  C~6VL9      
2020 06  21.45390  19 07 19.386  -20 36 39.07  25.5r 20KD53    266  C~6VL9      
2020 06  21.53376  19 07 18.952  -20 36 40.14  25.5r 20KD53    266  C~6VL9      
2020 06  21.61261  19 07 18.525  -20 36 41.18  25.5r 20KD53    266  C~6VL9      
2020 06  24.43648  19 07 03.363  -20 37 19.72  25.5r 20KD53    266  C~6VL9      
2020 06  24.52739  19 07 02.861  -20 37 20.97  25.5r 20KD53    266  C~6VL9      
2020 06  24.61708  19 07 02.368  -20 37 22.17  25.5r 20KD53    266  C~6VL9      
2021 06  17.43604  19 17 03.714  -20 54 20.48  25.2r 20KD53    266  C~7ulo      
2021 06  17.50052  19 17 03.379  -20 54 21.41  25.2r 20KD53    266  C~7ulo      
2021 06  17.57952  19 17 02.970  -20 54 22.53  25.2r 20KD53    266  C~7ulo      
2021 07  05.35105  19 15 27.220  -20 58 51.86  25.0r 20KD53    266  C~7ulo      
2021 07  05.43950  19 15 26.716  -20 58 53.27  25.0r 20KD53    266  C~7ulo      
2021 07  05.52516  19 15 26.229  -20 58 54.61  25.0r 20KD53    266  C~7ulo      
2021 09  05.23104  19 10 44.710  -21 14 03.43  25.7r 20KD53    266  C~7ulo      
2021 09  05.31313  19 10 44.508  -21 14 04.37  25.7r 20KD53    266  C~7ulo      
2021 09  05.39640  19 10 44.305  -21 14 05.30  25.7r 20KD53    266  C~7ulo      

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     0.05       0.00     0.01
     2   0.0002     -3.26     0.04      -0.20     0.01
     3   0.0003     -6.30     0.05      -0.39     0.01
     4   0.0082   -168.26    -0.02     -10.37     0.03
     5   0.0085   -173.37    -0.01     -10.68     0.03
     6   0.0087   -178.43    -0.01     -10.95     0.04
     7   0.0137   -285.36    -0.07     -17.51     0.03
     8   0.0139   -290.76    -0.07     -17.84     0.03
     9   0.0142   -296.18    -0.07     -18.13     0.03
    10   0.0712  -1729.53     0.00    -105.21    -0.00
    11   0.0714  -1735.71     0.00    -105.57    -0.00
    12   0.0716  -1741.78     0.00    -105.91    -0.00
    13   0.0794  -1957.69     0.03    -119.65    -0.06
    14   0.0796  -1964.83     0.03    -120.08    -0.07
    15   0.0799  -1971.85     0.04    -120.47    -0.06
    16   1.0595   6275.86     0.03   -2166.96    -0.04
    17   1.0597   6271.08     0.02   -2167.27    -0.04
    18   1.0599   6265.24     0.03   -2167.63    -0.04
    19   1.1086   4899.26    -0.02   -2261.27    -0.03
    20   1.1088   4892.07    -0.03   -2261.76    -0.03
    21   1.1091   4885.13    -0.02   -2262.22    -0.03
    22   1.2780    862.10    -0.00   -2673.84     0.05
    23   1.2782    859.18    -0.00   -2674.44     0.06
    24   1.2784    856.25    -0.01   -2675.02     0.07

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.

20KD53    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        95.644    95.767    95.539
ecceobj         0.637     0.637     0.636
incobj         15.301    15.302    15.299
qmin           33.448    34.015    33.364
qmax          167.248   167.148   164.654
amean          96.891    96.934    94.941
amin           93.559    94.828    91.866
amax          101.123   101.383    99.723
emean           0.641     0.638     0.635
emin            0.629     0.625     0.619
emax            0.654     0.650     0.652
imean          13.155    14.329    12.932
imin           11.918    13.560    11.548
imax           14.082    15.873    14.261
excite_mean     0.680     0.684     0.673
fracstop        1.000     1.000     1.000
cjmean          2.992     2.989     2.992

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       158.2     221.0     169.0
kozaiamp        180.0     179.9     180.0