Orbit Fit and Astrometric record for 21LS44

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: 21LS44    
# 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:
   0.000019   0.021909  -0.000004  -0.000698   0.023178   0.000000
# Chi-squared of fit:     1.29 DOF:     36 RMS:  0.04
# Min/Max residuals:    -0.10    0.07
# Exact a, adot, b, bdot, g, gdot:
  1.486443E-05  2.195094E-02 -3.558794E-07 -7.161875E-04  2.328810E-02  2.837295E-04
# Covariance matrix:
  2.7833E-13  8.3361E-14  2.1225E-15 -1.7593E-14  3.2458E-13  1.6046E-11
  8.3361E-14  8.3998E-13  5.8500E-15 -4.8562E-14  8.2791E-13  4.3790E-11
  2.1225E-15  5.8500E-15  1.8427E-13 -1.5744E-13  7.2966E-15  4.9094E-13
 -1.7593E-14 -4.8562E-14 -1.5744E-13  2.2203E-13 -6.0477E-14 -4.0908E-12
  3.2458E-13  8.2791E-13  7.2966E-15 -6.0477E-14  1.1193E-12  5.5183E-11
  1.6046E-11  4.3790E-11  4.9094E-13 -4.0908E-12  5.5183E-11  3.5818E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.168233  -73.278263    0.485534    0.017886   -0.887645  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:          180.36767 +/-    23.523
Argument of Peri:      327.90568 +/-    23.523
Long of Asc Node:      137.79345 +/-     0.016
Inclination:             2.17722 +/-     0.001
Eccentricity:         0.00657243 +/-    0.0001
Semi-Major Axis:     43.55137073 +/-    0.0035
Time of Perihelion: 2511752.6332 +/-    6859.3
Perihelion:          43.26513218 +/-    0.0044
Aphelion:            43.83760927 +/-    0.0045
Period (y)              287.4160 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.15110827 +/-    0.0005
Ecliptic Y          -42.11079957 +/-    0.0019
Ecliptic Z            0.87553452 +/-    0.0000
Ecliptic XDOT         0.00248718 +/-    0.0000
Ecliptic YDOT         0.00071606 +/-    0.0000
Ecliptic ZDOT        -0.00008369 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.83760296 +/-    0.0018
Geocenter to KBO     42.94038274 +/-    0.0020
# Hcoef:  8.40

The following table shows the complete astrometric record for 21LS44. 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 (21LS44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 11 54.196  -21 14 01.04  25.4r 21LS44    266  C~6Ip3      
2021 06  09.52741  19 11 53.831  -21 14 01.64  25.4r 21LS44    266  C~6Ip3      
2021 06  09.61426  19 11 53.459  -21 14 02.22  25.4r 21LS44    266  C~6Ip3      
2021 06  17.43605  19 11 19.260  -21 14 58.84  25.3r 21LS44    266  C~6Ip3      
2021 06  17.50053  19 11 18.963  -21 14 59.33  25.3r 21LS44    266  C~6Ip3      
2021 06  17.57953  19 11 18.598  -21 14 59.92  25.3r 21LS44    266  C~6Ip3      
2021 09  06.23258  19 05 44.452  -21 25 23.89  25.5r 21LS44    266  C~6Ip3      
2021 09  06.31281  19 05 44.277  -21 25 24.30  25.5r 21LS44    266  C~6Ip3      
2021 09  06.39352  19 05 44.104  -21 25 24.70  25.5r 21LS44    266  C~6Ip3      
2022 06  29.45229  19 15 48.124  -21 09 32.58  24.6r 21LS44    266  C~7um8      
2022 06  29.51531  19 15 47.816  -21 09 33.14  24.6r 21LS44    266  C~7um8      
2022 06  29.57696  19 15 47.515  -21 09 33.67  24.6r 21LS44    266  C~7um8      
2022 06  30.45132  19 15 43.330  -21 09 41.59  24.9r 21LS44    266  C~7um8      
2022 06  30.51472  19 15 43.019  -21 09 42.15  24.9r 21LS44    266  C~7um8      
2022 06  30.57688  19 15 42.715  -21 09 42.70  24.9r 21LS44    266  C~7um8      
2022 10  20.21696  19 10 58.885  -21 20 35.99  24.1V 21LS44    266  C~7um8      
2022 10  20.26058  19 10 58.968  -21 20 35.91  24.1V 21LS44    266  C~7um8      
2022 10  20.29842  19 10 59.040  -21 20 35.85  24.1V 21LS44    266  C~7um8      
2022 10  23.20599  19 11 05.182  -21 20 30.88  23.9V 21LS44    266  C~7um8      
2022 10  23.25093  19 11 05.281  -21 20 30.78  23.9V 21LS44    266  C~7um8      
2022 10  23.29489  19 11 05.377  -21 20 30.68  23.9V 21LS44    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    -0.03
     2   0.0002     -5.14     0.02       0.03    -0.03
     3   0.0005    -10.37     0.02       0.09    -0.03
     4   0.0219   -491.84    -0.02       2.38     0.04
     5   0.0221   -496.02    -0.01       2.40     0.04
     6   0.0223   -501.16    -0.02       2.44     0.04
     7   0.2431  -5211.87     0.02     -68.79     0.00
     8   0.2433  -5214.35    -0.00     -68.92     0.00
     9   0.2435  -5216.79    -0.01     -69.05    -0.00
    10   1.0541   3279.58    -0.06    -145.37     0.05
    11   1.0543   3275.23    -0.06    -145.37     0.04
    12   1.0544   3270.99    -0.06    -145.36     0.05
    13   1.0568   3211.90     0.07    -145.67    -0.10
    14   1.0570   3207.51     0.07    -145.66    -0.10
    15   1.0572   3203.22     0.07    -145.66    -0.10
    16   1.3628   -815.48     0.02    -297.64    -0.00
    17   1.3630   -814.32     0.03    -297.70     0.01
    18   1.3631   -813.32     0.03    -297.76    -0.00
    19   1.3710   -727.54    -0.04    -303.25     0.04
    20   1.3711   -726.15    -0.02    -303.32     0.04
    21   1.3713   -724.81    -0.03    -303.38     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.

21LS44    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.070    43.092    43.051
ecceobj         0.016     0.016     0.019
incobj          2.178     2.178     2.178
qmin           41.387    41.499    41.243
qmax           45.368    45.323    45.474
amean          43.295    43.319    43.274
amin           42.956    42.989    42.945
amax           43.642    43.655    43.618
emean           0.024     0.022     0.027
emin            0.004     0.003     0.007
emax            0.040     0.039     0.043
imean           1.994     1.969     2.022
imin            1.096     1.088     1.096
imax            2.694     2.669     2.721
excite_mean     0.042     0.041     0.045
fracstop        1.000     1.000     1.000
cjmean          3.091     3.091     3.090

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       186.1     182.7     188.0
kozaiamp        180.0     180.0     180.0