Orbit Fit and Astrometric record for 20KJ60

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: 20KJ60    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:  78.95d
# First observation: 2020/05/28
#  Last observation: 2020/08/15
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.016211   0.000004  -0.000698   0.022100   0.000000
# Chi-squared of fit:     6.62 DOF:     30 RMS:  0.11
# Min/Max residuals:    -0.30    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.469552E-05  2.189792E-02  1.884131E-07 -6.991209E-04  2.305027E-02 -2.182184E-03
# Covariance matrix:
  2.6031E-13  3.0014E-12 -3.4668E-15 -2.6334E-14  1.5466E-12  1.9897E-10
  3.0014E-12  1.8601E-07 -1.0308E-10 -1.5003E-10  3.4651E-08  5.7358E-07
 -3.4668E-15 -1.0308E-10  2.2240E-13 -8.9992E-13 -1.9214E-11 -3.2035E-10
 -2.6334E-14 -1.5003E-10 -8.9992E-13  1.1633E-11 -2.8147E-11 -5.0813E-10
  1.5466E-12  3.4651E-08 -1.9214E-11 -2.8147E-11  6.4623E-09  1.0844E-07
  1.9897E-10  5.7358E-07 -3.2035E-10 -5.0813E-10  1.0844E-07  2.1358E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.948073  -72.468685    0.657109    0.025901   -0.765273  2458997.971341
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:          290.12894 +/-    10.315
Argument of Peri:      216.29812 +/-    19.405
Long of Asc Node:      153.34693 +/-     0.628
Inclination:             2.63038 +/-     0.027
Eccentricity:         0.11708301 +/-    0.0622
Semi-Major Axis:     45.41513833 +/-    0.6974
Time of Perihelion: 2480687.2277 +/-    3163.7
Perihelion:          40.09779727 +/-    2.8911
Aphelion:            50.73247939 +/-    2.9302
Period (y)              306.0618 +/-      7.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.67040327 +/-    0.0456
Ecliptic Y          -42.27940147 +/-    0.1442
Ecliptic Z            1.47484415 +/-    0.0052
Ecliptic XDOT         0.00241111 +/-    0.0001
Ecliptic YDOT         0.00103134 +/-    0.0002
Ecliptic ZDOT        -0.00009204 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.16177162 +/-    0.1387
Geocenter to KBO     43.38343662 +/-    0.1513
# Hcoef:  8.64

The following table shows the complete astrometric record for 20KJ60. 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 (20KJ60) followed by the observatory code and reference code for the source of the astrometry.

2020 05  28.47054  19 14 55.237  -20 21 30.70  25.9r 20KJ60    266  C~6wsS      
2020 05  28.55757  19 14 54.902  -20 21 31.03  25.9r 20KJ60    266  C~6wsS      
2020 05  30.48152  19 14 48.180  -20 21 40.44  26.1r 20KJ60    266  C~6wsS      
2020 05  30.61166  19 14 47.700  -20 21 41.10  26.1r 20KJ60    266  C~6wsS      
2020 06  01.43269  19 14 41.085  -20 21 50.99  24.9r 20KJ60    266  C~7ulo      
2020 06  01.47325  19 14 40.932  -20 21 51.22  24.9r 20KJ60    266  C~7ulo      
2020 06  01.60571  19 14 40.432  -20 21 51.94  24.9r 20KJ60    266  C~7ulo      
2020 06  22.44948  19 13 12.764  -20 24 11.29  24.5r 20KJ60    266  C~7ulo      
2020 06  22.52092  19 13 12.429  -20 24 11.84  24.5r 20KJ60    266  C~7ulo      
2020 06  22.59118  19 13 12.099  -20 24 12.38  24.5r 20KJ60    266  C~7ulo      
2020 06  25.44823  19 12 58.840  -20 24 35.10  24.5r 20KJ60    266  C~7ulo      
2020 06  25.53072  19 12 58.447  -20 24 35.76  24.5r 20KJ60    266  C~7ulo      
2020 06  25.61487  19 12 58.047  -20 24 36.42  24.5r 20KJ60    266  C~7ulo      
2020 08  13.28708  19 09 16.245  -20 31 42.29  25.7r 20KJ60    266  C~6wsS      
2020 08  13.41742  19 09 15.731  -20 31 43.14  25.7r 20KJ60    266  C~6wsS      
2020 08  15.24331  19 09 08.934  -20 31 58.51  24.4r 20KJ60    266  C~7ulo      
2020 08  15.34125  19 09 08.567  -20 31 59.32  24.4r 20KJ60    266  C~7ulo      
2020 08  15.42111  19 09 08.268  -20 31 59.96  24.4r 20KJ60    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     0.07       0.00    -0.14
     2   0.0002     -4.71    -0.30       0.27     0.01
     3   0.0055    -99.67     0.18       3.01     0.14
     4   0.0059   -106.45     0.13       3.22     0.16
     5   0.0108   -199.98    -0.01       5.28    -0.11
     6   0.0110   -202.14    -0.02       5.32    -0.11
     7   0.0113   -209.21    -0.01       5.50    -0.12
     8   0.0684  -1449.63    -0.06      23.00     0.09
     9   0.0686  -1454.37    -0.05      23.04     0.10
    10   0.0688  -1459.05    -0.06      23.09     0.09
    11   0.0766  -1646.84     0.04      23.85    -0.02
    12   0.0768  -1652.40     0.04      23.89    -0.02
    13   0.0771  -1658.06     0.04      23.94    -0.02
    14   0.2103  -4804.53     0.18     -18.29    -0.03
    15   0.2107  -4811.80     0.07     -18.27     0.21
    16   0.2157  -4908.49    -0.08     -22.16    -0.08
    17   0.2159  -4913.71    -0.08     -22.35    -0.08
    18   0.2162  -4917.95    -0.07     -22.48    -0.08

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.

20KJ60    quality flag:1

Type:      CLASSICAL CLASSICAL  SCATNEAR

axisobj        44.878    49.746    42.727
ecceobj         0.119     0.137     0.206
incobj          2.630     2.551     2.701
qmin           38.475    42.432    33.619
qmax           52.079    58.073    52.693
amean          45.109    50.046    42.793
amin           44.700    49.608    42.316
amax           45.547    50.544    43.352
emean           0.126     0.138     0.147
emin            0.107     0.128     0.105
emax            0.144     0.149     0.216
imean           2.517     2.116     4.259
imin            1.724     1.880     1.294
imax            3.272     2.333     6.641
excite_mean     0.133     0.143     0.169
fracstop        1.000     1.000     1.000
cjmean          3.093     3.153     3.053

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       187.5     176.2     185.9
kozaiamp        180.0     180.0     180.0