Orbit Fit and Astrometric record for 21LH44

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: 21LH44    
# 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:
  -0.000034   0.023645  -0.000002  -0.000774   0.023944   0.000000
# Chi-squared of fit:     0.59 DOF:     36 RMS:  0.03
# Min/Max residuals:    -0.07    0.05
# Exact a, adot, b, bdot, g, gdot:
  1.557068E-05  2.377783E-02 -5.200713E-07 -8.001639E-04  2.413963E-02  5.386580E-04
# Covariance matrix:
  3.4511E-13  6.3537E-13  1.8442E-14 -2.7996E-13  1.3439E-12  2.0092E-10
  6.3537E-13  3.0954E-12  8.2968E-14 -1.2611E-12  5.5275E-12  9.0158E-10
  1.8442E-14  8.2968E-14  1.4163E-13 -1.5169E-13  1.6795E-13  3.0410E-11
 -2.7996E-13 -1.2611E-12 -1.5169E-13  8.2669E-13 -2.5541E-12 -4.6284E-10
  1.3439E-12  5.5275E-12  1.6795E-13 -2.5541E-12  1.0729E-11  1.8229E-09
  2.0092E-10  9.0158E-10  3.0410E-11 -4.6284E-10  1.8229E-09  3.2954E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.753546  -72.835082    0.492387    0.011412   -0.883969  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:           10.41349 +/-    26.402
Argument of Peri:      147.43807 +/-    29.170
Long of Asc Node:      127.56210 +/-     0.013
Inclination:             2.05261 +/-     0.001
Eccentricity:         0.04835876 +/-    0.0053
Semi-Major Axis:     44.42879363 +/-    0.0305
Time of Perihelion: 2456241.6181 +/-    7932.9
Perihelion:          42.28027248 +/-    0.2383
Aphelion:            46.57731478 +/-    0.2387
Period (y)              296.1454 +/-      0.31
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.02331913 +/-    0.0016
Ecliptic Y          -40.57186943 +/-    0.0054
Ecliptic Z            0.54486450 +/-    0.0001
Ecliptic XDOT         0.00260065 +/-    0.0000
Ecliptic YDOT         0.00074351 +/-    0.0001
Ecliptic ZDOT        -0.00009013 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.31942426 +/-    0.0052
Geocenter to KBO     41.42566201 +/-    0.0056
# Hcoef:  9.04

The following table shows the complete astrometric record for 21LH44. 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 (21LH44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 14 00.851  -21 35 23.66  25.8r 21LH44    266  C~6Ip2      
2021 06  09.52741  19 14 00.477  -21 35 24.31  25.8r 21LH44    266  C~6Ip2      
2021 06  09.61426  19 14 00.097  -21 35 24.95  25.8r 21LH44    266  C~6Ip2      
2021 06  17.43605  19 13 25.068  -21 36 26.73  25.6r 21LH44    266  C~6Ip2      
2021 06  17.50053  19 13 24.763  -21 36 27.26  25.6r 21LH44    266  C~6Ip2      
2021 06  17.57953  19 13 24.389  -21 36 27.90  25.6r 21LH44    266  C~6Ip2      
2021 07  05.35106  19 11 57.557  -21 39 03.25  25.7r 21LH44    266  C~6Ip2      
2021 07  05.43951  19 11 57.104  -21 39 04.07  25.7r 21LH44    266  C~6Ip2      
2021 07  05.52517  19 11 56.665  -21 39 04.84  25.7r 21LH44    266  C~6Ip2      
2021 09  06.23258  19 07 39.470  -21 47 14.36  26.2r 21LH44    266  C~6Ip2      
2021 09  06.31281  19 07 39.290  -21 47 14.75  26.2r 21LH44    266  C~6Ip2      
2021 09  06.39352  19 07 39.111  -21 47 15.12  26.2r 21LH44    266  C~6Ip2      
2022 10  20.21696  19 13 20.496  -21 41 23.39  24.6V 21LH44    266  C~7um8      
2022 10  20.26058  19 13 20.581  -21 41 23.28  24.6V 21LH44    266  C~7um8      
2022 10  20.29842  19 13 20.656  -21 41 23.19  24.6V 21LH44    266  C~7um8      
2022 10  21.20926  19 13 22.556  -21 41 21.17  25.0V 21LH44    266  C~7um8      
2022 10  21.25420  19 13 22.648  -21 41 21.06  25.0V 21LH44    266  C~7um8      
2022 10  21.29846  19 13 22.740  -21 41 20.94  25.0V 21LH44    266  C~7um8      
2022 10  23.20599  19 13 26.986  -21 41 16.21  24.5V 21LH44    266  C~7um8      
2022 10  23.25093  19 13 27.087  -21 41 16.08  24.5V 21LH44    266  C~7um8      
2022 10  23.29489  19 13 27.187  -21 41 15.94  24.5V 21LH44    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     0.00       0.00    -0.00
     2   0.0002     -5.26     0.00       0.01    -0.00
     3   0.0005    -10.60     0.01       0.05     0.00
     4   0.0219   -503.03    -0.03       0.20     0.04
     5   0.0221   -507.31    -0.03       0.21     0.04
     6   0.0223   -512.57    -0.03       0.23     0.05
     7   0.0709  -1733.30     0.03      -3.63     0.02
     8   0.0712  -1739.67     0.03      -3.67     0.01
     9   0.0714  -1745.84     0.03      -3.68     0.01
    10   0.2431  -5363.85    -0.01     -61.35    -0.07
    11   0.2433  -5366.39    -0.01     -61.45    -0.07
    12   0.2435  -5368.91    -0.00     -61.53    -0.07
    13   1.3628   -603.42    -0.01    -286.14     0.01
    14   1.3630   -602.23    -0.01    -286.18     0.01
    15   1.3631   -601.19     0.00    -286.22     0.01
    16   1.3656   -574.66     0.04    -287.53     0.01
    17   1.3657   -573.37     0.04    -287.59     0.01
    18   1.3658   -572.09     0.05    -287.63     0.01
    19   1.3710   -512.78    -0.04    -290.35    -0.01
    20   1.3711   -511.36    -0.04    -290.40    -0.01
    21   1.3713   -509.96    -0.04    -290.43    -0.00

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.

21LH44    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.902    44.443    43.706
ecceobj         0.038     0.085     0.057
incobj          2.054     2.057     2.051
qmin           41.736    40.165    40.537
qmax           46.721    49.409    47.554
amean          44.139    44.696    43.927
amin           43.798    44.335    43.586
amax           44.484    45.088    44.287
emean           0.035     0.083     0.058
emin            0.019     0.068     0.041
emax            0.051     0.097     0.074
imean           1.356     1.278     1.544
imin            0.724     0.687     0.720
imax            1.943     1.852     2.225
excite_mean     0.044     0.086     0.064
fracstop        1.000     1.000     1.000
cjmean          3.101     3.101     3.096

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       156.6     170.1     180.0
kozaiamp        180.0     180.0     180.0