Orbit Fit and Astrometric record for 21LY43

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: 21LY43    
# Created Tue Apr  1 01:11:25 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   1.37y
# First observation: 2021/06/09
#  Last observation: 2022/10/21
Preliminary a, adot, b, bdot, g, gdot:
  -0.000033   0.025489  -0.000004  -0.002260   0.024754   0.000000
# Chi-squared of fit:     0.39 DOF:     30 RMS:  0.03
# Min/Max residuals:    -0.05    0.04
# Exact a, adot, b, bdot, g, gdot:
  1.622966E-05  2.562680E-02 -1.642392E-06 -2.321698E-03  2.493378E-02 -1.471740E-03
# Covariance matrix:
  3.3203E-13  7.9848E-13  4.2422E-14 -6.4861E-13  1.2733E-12  1.7875E-10
  7.9848E-13  5.2945E-12  2.7460E-13 -4.2004E-12  7.2834E-12  1.1544E-09
  4.2422E-14  2.7460E-13  1.5545E-13 -3.6574E-13  4.0334E-13  6.9413E-11
 -6.4861E-13 -4.2004E-12 -3.6574E-13  4.0979E-12 -6.1700E-12 -1.0621E-09
  1.2733E-12  7.2834E-12  4.0334E-13 -6.1700E-12  1.0514E-11  1.6951E-09
  1.7875E-10  1.1544E-09  6.9413E-11 -1.0621E-09  1.6951E-09  2.9142E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.077690  -72.021140    0.504896    0.016279   -0.876808  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:          332.71826 +/-     5.777
Argument of Peri:      204.01957 +/-     8.082
Long of Asc Node:      118.80520 +/-     0.005
Inclination:             5.26386 +/-     0.002
Eccentricity:         0.13534064 +/-    0.0132
Semi-Major Axis:     46.35388845 +/-    0.1607
Time of Perihelion: 2468106.1921 +/-    1849.3
Perihelion:          40.08032373 +/-    0.6296
Aphelion:            52.62745317 +/-    0.6406
Period (y)              315.6003 +/-      1.64
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.17595436 +/-    0.0016
Ecliptic Y          -39.13586692 +/-    0.0050
Ecliptic Z            0.75433426 +/-    0.0001
Ecliptic XDOT         0.00263372 +/-    0.0000
Ecliptic YDOT         0.00102482 +/-    0.0001
Ecliptic ZDOT        -0.00025812 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.99315753 +/-    0.0048
Geocenter to KBO     40.10623239 +/-    0.0052
# Hcoef:  9.00

The following table shows the complete astrometric record for 21LY43. 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 (21LY43) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 17 18.078  -21 09 48.66  25.0r 21LY43    266  C~6Ip2      
2021 06  09.52741  19 17 17.701  -21 09 49.40  25.0r 21LY43    266  C~6Ip2      
2021 06  09.61426  19 17 17.317  -21 09 50.13  25.0r 21LY43    266  C~6Ip2      
2021 06  17.43605  19 16 41.938  -21 11 00.41  25.0r 21LY43    266  C~6Ip2      
2021 06  17.50053  19 16 41.629  -21 11 01.03  25.0r 21LY43    266  C~6Ip2      
2021 06  17.57953  19 16 41.251  -21 11 01.76  25.0r 21LY43    266  C~6Ip2      
2021 07  05.35106  19 15 13.069  -21 13 59.66  25.0r 21LY43    266  C~6Ip2      
2021 07  05.43951  19 15 12.607  -21 14 00.60  25.0r 21LY43    266  C~6Ip2      
2021 07  05.52517  19 15 12.160  -21 14 01.49  25.0r 21LY43    266  C~6Ip2      
2021 09  05.23105  19 10 50.418  -21 23 44.33  25.2r 21LY43    266  C~6Ip2      
2021 09  05.31314  19 10 50.220  -21 23 44.88  25.2r 21LY43    266  C~6Ip2      
2021 09  05.39641  19 10 50.019  -21 23 45.41  25.2r 21LY43    266  C~6Ip2      
2022 10  20.21696  19 16 56.204  -21 22 50.47        21LY43    266  C~8ebm      
2022 10  20.26058  19 16 56.290  -21 22 50.41        21LY43    266  C~8ebm      
2022 10  20.29842  19 16 56.365  -21 22 50.36        21LY43    266  C~8ebm      
2022 10  21.20926  19 16 58.287  -21 22 49.24        21LY43    266  C~8ebn      
2022 10  21.25420  19 16 58.381  -21 22 49.17        21LY43    266  C~8ebn      
2022 10  21.29846  19 16 58.473  -21 22 49.09        21LY43    266  C~8ebn      

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     0.04
     2   0.0002     -5.33     0.01      -0.04     0.03
     3   0.0005    -10.75     0.00      -0.06     0.03
     4   0.0219   -510.55    -0.03      -4.81    -0.03
     5   0.0221   -514.91    -0.03      -4.86    -0.04
     6   0.0223   -520.25    -0.02      -4.90    -0.04
     7   0.0709  -1766.09     0.03     -21.54     0.04
     8   0.0712  -1772.62     0.02     -21.64     0.04
     9   0.0714  -1778.93     0.03     -21.72     0.04
    10   0.2404  -5481.90    -0.01    -143.02    -0.04
    11   0.2406  -5484.72     0.00    -143.23    -0.05
    12   0.2408  -5487.57    -0.01    -143.41    -0.05
    13   1.3628   -405.82     0.01    -734.87     0.02
    14   1.3630   -404.62     0.01    -734.97     0.02
    15   1.3631   -403.57     0.01    -735.06     0.01
    16   1.3656   -376.81    -0.01    -737.46    -0.01
    17   1.3657   -375.50    -0.00    -737.57    -0.01
    18   1.3658   -374.22    -0.01    -737.66    -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.

21LY43    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.766    45.956    45.753
ecceobj         0.128     0.163     0.126
incobj          5.276     5.269     5.276
qmin           39.427    37.972    39.526
qmax           53.013    54.827    52.772
amean          46.014    46.189    45.989
amin           45.625    45.780    45.605
amax           46.439    46.640    46.409
emean           0.128     0.163     0.125
emin            0.115     0.149     0.111
emax            0.142     0.176     0.138
imean           3.799     3.781     3.787
imin            3.360     3.283     3.357
imax            4.325     4.405     4.290
excite_mean     0.145     0.176     0.141
fracstop        1.000     1.000     1.000
cjmean          3.101     3.091     3.102

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       185.3     182.2     185.9
kozaiamp        180.0     180.0     180.0