Orbit Fit and Astrometric record for 21LE44

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: 21LE44    
# Created Tue Apr  1 01:11:25 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:   1.37y
# First observation: 2021/06/09
#  Last observation: 2022/10/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000030   0.020909  -0.000002  -0.000997   0.022511   0.000000
# Chi-squared of fit:     0.51 DOF:     36 RMS:  0.03
# Min/Max residuals:    -0.08    0.04
# Exact a, adot, b, bdot, g, gdot:
  1.469244E-05  2.098743E-02 -6.938857E-07 -1.023371E-03  2.266977E-02 -1.404247E-03
# Covariance matrix:
  3.4296E-13  1.6945E-13  2.2923E-14 -3.4816E-13  1.2494E-12  2.0933E-10
  1.6945E-13  6.8362E-13  1.5940E-14 -2.4108E-13  1.2504E-12  1.4674E-10
  2.2923E-14  1.5940E-14  1.4317E-13 -1.7577E-13  1.9417E-13  4.0006E-11
 -3.4816E-13 -2.4108E-13 -1.7577E-13  1.1936E-12 -2.9527E-12 -6.0872E-10
  1.2494E-12  1.2504E-12  1.9417E-13 -2.9527E-12  9.2389E-12  1.7690E-09
  2.0933E-10  1.4674E-10  4.0006E-11 -6.0872E-10  1.7690E-09  3.6406E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.652936  -72.851740    0.492130    0.009861   -0.884131  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:          267.20536 +/-     4.521
Argument of Peri:      268.88283 +/-     3.976
Long of Asc Node:      119.47329 +/-     0.008
Inclination:             2.85518 +/-     0.002
Eccentricity:         0.07988854 +/-    0.0276
Semi-Major Axis:     44.55189014 +/-    0.1921
Time of Perihelion: 2487367.9218 +/-    1351.9
Perihelion:          40.99270468 +/-    1.2440
Aphelion:            48.11107561 +/-    1.2487
Period (y)              297.3770 +/-      1.92
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.80396597 +/-    0.0017
Ecliptic Y          -43.14265126 +/-    0.0057
Ecliptic Z            0.50272615 +/-    0.0001
Ecliptic XDOT         0.00237798 +/-    0.0000
Ecliptic YDOT         0.00091516 +/-    0.0001
Ecliptic ZDOT        -0.00012571 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.00536230 +/-    0.0054
Geocenter to KBO     44.11160937 +/-    0.0059
# Hcoef:  8.35

The following table shows the complete astrometric record for 21LE44. 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 (21LE44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 13 59.864  -21 41 30.53  25.4r 21LE44    266  C~6Ip2      
2021 06  09.52601  19 13 59.514  -21 41 31.16  25.4r 21LE44    266  C~6Ip2      
2021 06  09.61426  19 13 59.146  -21 41 31.80  25.4r 21LE44    266  C~6Ip2      
2021 06  17.43605  19 13 25.820  -21 42 32.26  25.4r 21LE44    266  C~6Ip2      
2021 06  17.50053  19 13 25.529  -21 42 32.78  25.4r 21LE44    266  C~6Ip2      
2021 06  17.57953  19 13 25.174  -21 42 33.40  25.4r 21LE44    266  C~6Ip2      
2021 07  05.35106  19 12 02.631  -21 45 04.27  25.2r 21LE44    266  C~6Ip2      
2021 07  05.43951  19 12 02.200  -21 45 05.06  25.2r 21LE44    266  C~6Ip2      
2021 07  05.52517  19 12 01.783  -21 45 05.81  25.2r 21LE44    266  C~6Ip2      
2021 09  06.23258  19 07 56.488  -21 52 58.28  25.8r 21LE44    266  C~6Ip2      
2021 09  06.31281  19 07 56.314  -21 52 58.66  25.8r 21LE44    266  C~6Ip2      
2021 09  06.39352  19 07 56.141  -21 52 59.02  25.8r 21LE44    266  C~6Ip2      
2022 10  20.21696  19 12 56.168  -21 49 01.65  24.2V 21LE44    266  C~7um8      
2022 10  20.26058  19 12 56.246  -21 49 01.55  24.2V 21LE44    266  C~7um8      
2022 10  20.29842  19 12 56.315  -21 49 01.47  24.2V 21LE44    266  C~7um8      
2022 10  21.20926  19 12 58.064  -21 48 59.54  24.1V 21LE44    266  C~7um8      
2022 10  21.25420  19 12 58.149  -21 48 59.43  24.1V 21LE44    266  C~7um8      
2022 10  21.29846  19 12 58.233  -21 48 59.33  24.1V 21LE44    266  C~7um8      
2022 10  23.20599  19 13 02.166  -21 48 55.02  24.3V 21LE44    266  C~7um8      
2022 10  23.25093  19 13 02.259  -21 48 54.90  24.3V 21LE44    266  C~7um8      
2022 10  23.29489  19 13 02.351  -21 48 54.78  24.3V 21LE44    266  C~7um8      

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    -0.00
     2   0.0002     -4.92    -0.01      -0.01    -0.01
     3   0.0005    -10.09    -0.01       0.00    -0.01
     4   0.0219   -478.47     0.02      -1.57    -0.02
     5   0.0221   -482.56     0.01      -1.57    -0.01
     6   0.0223   -487.54     0.02      -1.57    -0.01
     7   0.0709  -1647.57    -0.00      -8.43     0.01
     8   0.0712  -1653.62    -0.01      -8.47     0.01
     9   0.0714  -1659.48    -0.01      -8.50     0.00
    10   0.2431  -5108.37    -0.00     -68.43     0.02
    11   0.2433  -5110.82    -0.00     -68.53     0.02
    12   0.2435  -5113.25     0.01     -68.60     0.02
    13   1.3628   -936.96     0.02    -336.31    -0.08
    14   1.3630   -935.87     0.01    -336.35    -0.08
    15   1.3631   -934.90     0.02    -336.39    -0.08
    16   1.3656   -910.50    -0.01    -337.51     0.04
    17   1.3657   -909.31    -0.01    -337.54     0.04
    18   1.3658   -908.13    -0.01    -337.59     0.04
    19   1.3710   -853.25    -0.00    -340.14     0.04
    20   1.3711   -851.95    -0.01    -340.18     0.04
    21   1.3713   -850.67    -0.01    -340.22     0.04

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.

21LE44    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.071    44.595    43.973
ecceobj         0.084     0.155     0.039
incobj          2.860     2.855     2.862
qmin           39.573    36.280    41.478
qmax           49.245    53.698    47.080
amean          44.273    44.790    44.189
amin           43.918    44.389    43.849
amax           44.651    45.243    44.543
emean           0.087     0.166     0.042
emin            0.071     0.143     0.027
emax            0.103     0.188     0.057
imean           1.869     2.663     1.686
imin            1.038     0.975     1.057
imax            2.598     4.354     2.301
excite_mean     0.093     0.173     0.052
fracstop        1.000     1.000     1.000
cjmean          3.094     3.074     3.101

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       181.5     178.0     178.2
kozaiamp        180.0     180.0     179.9