Orbit Fit and Astrometric record for 20KJ55

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: 20KJ55    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:  26.17d
# First observation: 2020/05/29
#  Last observation: 2020/06/24
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.023972  -0.000000  -0.000082   0.023330   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit:     0.07 DOF:     19 RMS:  0.01
# Min/Max residuals:    -0.02    0.02
# Exact a, adot, b, bdot, g, gdot:
  1.477956E-05  2.120736E-02  6.989545E-08 -3.494524E-05  2.275273E-02  4.151857E-03
# Covariance matrix:
  1.1969E-12  1.5942E-09 -6.6535E-14 -2.7856E-11  3.1360E-10  1.9271E-08
  1.5942E-09  2.9328E-06 -1.1853E-10 -5.1280E-08  5.6723E-07  2.9135E-05
 -6.6535E-14 -1.1853E-10  2.6585E-13 -1.9544E-12 -2.3060E-11 -1.2788E-09
 -2.7856E-11 -5.1280E-08 -1.9544E-12  1.0132E-09 -9.9121E-09 -5.0470E-07
  3.1360E-10  5.6723E-07 -2.3060E-11 -9.9121E-09  1.1002E-07  5.8693E-06
  1.9271E-08  2.9135E-05 -1.2788E-09 -5.0470E-07  5.8693E-06  4.6690E-04
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.098146  -73.913001    0.624706    0.028884   -0.791896  2458998.947781
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           70.43169 +/-   118.263
Argument of Peri:        0.73954 +/-    50.439
Long of Asc Node:      193.56162 +/-     1.585
Inclination:             2.06145 +/-     0.001
Eccentricity:         0.17974722 +/-    1.0138
Semi-Major Axis:     46.10592663 +/-   22.5233
Time of Perihelion: 2436618.7922 +/-   33798.9
Perihelion:          37.81851432 +/-   50.2597
Aphelion:            54.39333894 +/-   53.7660
Period (y)              313.0714 +/-    229.41
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.79543273 +/-    0.1774
Ecliptic Y          -43.14278956 +/-    0.6152
Ecliptic Z            1.60917143 +/-    0.0235
Ecliptic XDOT         0.00259847 +/-    0.0009
Ecliptic YDOT         0.00023081 +/-    0.0025
Ecliptic ZDOT         0.00001386 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   44.75513330 +/-    0.5949
Geocenter to KBO     43.95077423 +/-    0.6407
# Hcoef:  9.65

The following table shows the complete astrometric record for 20KJ55. 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 (20KJ55) followed by the observatory code and reference code for the source of the astrometry.

2020 05  29.44698  19 08 43.779  -20 23 12.13  26.2r 20KJ55    266  C~6c5b      
2020 05  29.53371  19 08 43.462  -20 23 12.50  26.2r 20KJ55    266  C~6c5b      
2020 05  29.61905  19 08 43.149  -20 23 12.85  26.2r 20KJ55    266  C~6c5b      
2020 05  31.44139  19 08 36.531  -20 23 20.63  26.2r 20KJ55    266  C~6c5b      
2020 05  31.52961  19 08 36.198  -20 23 21.03  26.2r 20KJ55    266  C~6c5b      
2020 05  31.61814  19 08 35.863  -20 23 21.42  26.2r 20KJ55    266  C~6c5b      
2020 06  21.45390  19 07 08.512  -20 25 18.81  25.8r 20KJ55    266  C~6c5b      
2020 06  21.53236  19 07 08.146  -20 25 19.33  25.8r 20KJ55    266  C~6c5b      
2020 06  21.61261  19 07 07.773  -20 25 19.85  25.8r 20KJ55    266  C~6c5b      
2020 06  24.43648  19 06 54.746  -20 25 39.02  26.1r 20KJ55    266  C~6c5b      
2020 06  24.52739  19 06 54.316  -20 25 39.65  26.1r 20KJ55    266  C~6c5b      
2020 06  24.61708  19 06 53.893  -20 25 40.25  26.1r 20KJ55    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    -0.01       0.00    -0.02
     2   0.0002     -4.47    -0.01       0.16    -0.02
     3   0.0005     -8.88    -0.01       0.33    -0.02
     4   0.0055   -102.20     0.01       3.53     0.02
     5   0.0057   -106.90     0.01       3.69     0.02
     6   0.0059   -111.62     0.00       3.85     0.02
     7   0.0630  -1345.00    -0.01      30.07    -0.01
     8   0.0632  -1350.17    -0.01      30.14    -0.01
     9   0.0634  -1355.44    -0.00      30.23    -0.02
    10   0.0712  -1539.56    -0.00      32.25     0.02
    11   0.0714  -1545.64     0.00      32.32     0.01
    12   0.0716  -1551.61     0.01      32.40     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.

20KJ55    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0