Orbit Fit and Astrometric record for 21LX43

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: 21LX43    
# 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   0.022052  -0.000002  -0.000658   0.023199   0.000000
# Chi-squared of fit:     3.75 DOF:     36 RMS:  0.07
# Min/Max residuals:    -0.19    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.494081E-05  2.212805E-02 -1.087840E-06 -6.815317E-04  2.336086E-02  7.164694E-04
# Covariance matrix:
  3.4571E-13  2.5961E-13  1.7981E-14 -2.7517E-13  1.2973E-12  2.1264E-10
  2.5961E-13  8.7890E-13  2.4742E-14 -3.7821E-13  2.0237E-12  2.9447E-10
  1.7981E-14  2.4742E-14  1.4130E-13 -1.4970E-13  1.5613E-13  3.1287E-11
 -2.7517E-13 -3.7821E-13 -1.4970E-13  8.0346E-13 -2.3918E-12 -4.7953E-10
  1.2973E-12  2.0237E-12  1.5613E-13 -2.3918E-12  9.8329E-12  1.8351E-09
  2.1264E-10  2.9447E-10  3.1287E-11 -4.7953E-10  1.8351E-09  3.6666E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.968748  -72.001282    0.505200    0.014609   -0.876662  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:           86.82015 +/-     2.396
Argument of Peri:       62.50879 +/-     0.595
Long of Asc Node:      135.81802 +/-     0.019
Inclination:             1.99020 +/-     0.001
Eccentricity:         0.01892720 +/-    0.0273
Semi-Major Axis:     43.72328758 +/-    0.0520
Time of Perihelion: 2433903.0391 +/-     701.4
Perihelion:          42.89572826 +/-    1.1934
Aphelion:            44.55084690 +/-    1.1935
Period (y)              289.1195 +/-      0.52
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           13.02387773 +/-    0.0018
Ecliptic Y          -41.70076454 +/-    0.0055
Ecliptic Z            0.72376416 +/-    0.0001
Ecliptic XDOT         0.00249839 +/-    0.0000
Ecliptic YDOT         0.00072733 +/-    0.0001
Ecliptic ZDOT        -0.00007863 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.69323734 +/-    0.0052
Geocenter to KBO     42.80663988 +/-    0.0057
# Hcoef:  8.93

The following table shows the complete astrometric record for 21LX43. 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 (21LX43) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 17 26.841  -21 16 08.01  25.6r 21LX43    266  C~6Ip2      
2021 06  09.52881  19 17 26.475  -21 16 08.66  25.6r 21LX43    266  C~6Ip2      
2021 06  09.61426  19 17 26.114  -21 16 09.28  25.6r 21LX43    266  C~6Ip2      
2021 06  17.43605  19 16 52.306  -21 17 10.31  26.2r 21LX43    266  C~6Ip2      
2021 06  17.50053  19 16 52.011  -21 17 10.84  26.2r 21LX43    266  C~6Ip2      
2021 06  17.57953  19 16 51.650  -21 17 11.47  26.2r 21LX43    266  C~6Ip2      
2021 07  05.35106  19 15 27.550  -21 19 46.76  25.6r 21LX43    266  C~6Ip2      
2021 07  05.43951  19 15 27.110  -21 19 47.59  25.6r 21LX43    266  C~6Ip2      
2021 07  05.52517  19 15 26.683  -21 19 48.36  25.6r 21LX43    266  C~6Ip2      
2021 09  05.23105  19 11 16.143  -21 28 09.59  26.3r 21LX43    266  C~6Ip2      
2021 09  05.31314  19 11 15.950  -21 28 10.04  26.3r 21LX43    266  C~6Ip2      
2021 09  05.39641  19 11 15.755  -21 28 10.47  26.3r 21LX43    266  C~6Ip2      
2022 10  20.21696  19 16 25.670  -21 22 32.11  24.6V 21LX43    266  C~7um7      
2022 10  20.26058  19 16 25.748  -21 22 32.02  24.6V 21LX43    266  C~7um7      
2022 10  20.29842  19 16 25.816  -21 22 31.95  24.6V 21LX43    266  C~7um7      
2022 10  21.20926  19 16 27.552  -21 22 30.11  24.6V 21LX43    266  C~7um7      
2022 10  21.25420  19 16 27.636  -21 22 30.01  24.6V 21LX43    266  C~7um7      
2022 10  21.29846  19 16 27.719  -21 22 29.91  24.6V 21LX43    266  C~7um8      
2022 10  23.20599  19 16 31.628  -21 22 26.00  24.7V 21LX43    266  C~7um8      
2022 10  23.25093  19 16 31.721  -21 22 25.89  24.7V 21LX43    266  C~7um8      
2022 10  23.29489  19 16 31.812  -21 22 25.77  24.7V 21LX43    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     0.13
     2   0.0002     -5.16     0.01       0.03     0.13
     3   0.0005    -10.24     0.01       0.08     0.13
     4   0.0219   -486.71    -0.05       1.69     0.06
     5   0.0221   -490.87    -0.05       1.70     0.06
     6   0.0223   -495.96    -0.05       1.74     0.06
     7   0.0709  -1681.47     0.05       0.40    -0.03
     8   0.0712  -1687.67     0.05       0.37    -0.04
     9   0.0714  -1693.69     0.05       0.37    -0.04
    10   0.2404  -5229.01    -0.01     -57.94    -0.18
    11   0.2406  -5231.74    -0.01     -58.06    -0.19
    12   0.2408  -5234.50    -0.01     -58.16    -0.19
    13   1.3628   -897.74    -0.02    -268.73    -0.06
    14   1.3630   -896.65    -0.01    -268.79    -0.06
    15   1.3631   -895.70    -0.01    -268.84    -0.06
    16   1.3656   -871.42     0.01    -270.18     0.11
    17   1.3657   -870.24     0.01    -270.23     0.11
    18   1.3658   -869.08    -0.00    -270.28     0.11
    19   1.3710   -814.43     0.01    -273.53    -0.02
    20   1.3711   -813.13     0.02    -273.59    -0.02
    21   1.3713   -811.85     0.01    -273.63    -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.

21LX43    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.234    43.797    43.065
ecceobj         0.019     0.084     0.047
incobj          1.991     1.994     1.988
qmin           41.667    39.566    39.975
qmax           45.471    48.795    46.757
amean          43.461    44.045    43.274
amin           43.130    43.692    42.931
amax           43.800    44.425    43.631
emean           0.022     0.082     0.055
emin            0.005     0.065     0.035
emax            0.038     0.099     0.072
imean           1.725     1.578     2.025
imin            0.875     0.730     0.931
imax            2.412     2.310     2.753
excite_mean     0.038     0.087     0.066
fracstop        1.000     1.000     1.000
cjmean          3.093     3.093     3.087

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       188.8     167.0     185.6
kozaiamp        179.9     180.0     180.0