Orbit Fit and Astrometric record for 21LZ44

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: 21LZ44    
# Created Tue Apr  1 01:11:25 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:   1.37y
# First observation: 2021/06/09
#  Last observation: 2022/10/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000012   0.023792  -0.000001  -0.000295   0.024065   0.000000
# Chi-squared of fit:     0.83 DOF:     24 RMS:  0.04
# Min/Max residuals:    -0.07    0.08
# Exact a, adot, b, bdot, g, gdot:
  1.577379E-05  2.395218E-02 -1.807439E-07 -3.128568E-04  2.426693E-02  9.118829E-05
# Covariance matrix:
  3.8914E-13  1.4668E-12  3.0296E-14 -4.3276E-13  2.6336E-12  4.2730E-10
  1.4668E-12  1.7603E-11  3.5986E-13 -5.2010E-12  2.9153E-11  5.0914E-09
  3.0296E-14  3.5986E-13  1.9425E-13 -2.5879E-13  6.0951E-13  1.0844E-10
 -4.3276E-13 -5.2010E-12 -2.5879E-13  1.8621E-12 -8.8168E-12 -1.5717E-09
  2.6336E-12  2.9153E-11  6.0951E-13 -8.8168E-12  4.9106E-11  8.6255E-09
  4.2730E-10  5.0914E-09  1.0844E-10 -1.5717E-09  8.6255E-09  1.5354E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.514559  -73.296940    0.485245    0.023255   -0.887678  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:          348.62052 +/-    59.827
Argument of Peri:      128.69163 +/-    65.766
Long of Asc Node:      169.81440 +/-     0.045
Inclination:             1.65254 +/-     0.001
Eccentricity:         0.04596096 +/-    0.0110
Semi-Major Axis:     44.08844463 +/-    0.0279
Time of Perihelion: 2462750.4115 +/-   17769.8
Perihelion:          42.06209758 +/-    0.4838
Aphelion:            46.11479169 +/-    0.4839
Period (y)              292.7490 +/-      0.28
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           11.63833561 +/-    0.0034
Ecliptic Y          -40.45062351 +/-    0.0114
Ecliptic Z            1.08924547 +/-    0.0003
Ecliptic XDOT         0.00259712 +/-    0.0000
Ecliptic YDOT         0.00077307 +/-    0.0001
Ecliptic ZDOT        -0.00003520 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.10570334 +/-    0.0110
Geocenter to KBO     41.20834598 +/-    0.0119
# Hcoef:  8.25

The following table shows the complete astrometric record for 21LZ44. 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 (21LZ44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 11 38.512  -20 53 31.91  25.0r 21LZ44    266  C~6Ip3      
2021 06  09.52601  19 11 38.141  -20 53 32.47  25.0r 21LZ44    266  C~6Ip3      
2021 06  09.61426  19 11 37.752  -20 53 33.03  25.0r 21LZ44    266  C~6Ip3      
2021 06  17.43605  19 11 02.501  -20 54 27.72  24.9r 21LZ44    266  C~6Ip3      
2021 06  17.50053  19 11 02.195  -20 54 28.20  24.9r 21LZ44    266  C~6Ip3      
2021 06  17.57953  19 11 01.819  -20 54 28.77  24.9r 21LZ44    266  C~6Ip3      
2021 09  06.23258  19 05 17.955  -21 05 03.21  25.2r 21LZ44    266  C~6Ip3      
2021 09  06.31281  19 05 17.779  -21 05 03.64  25.2r 21LZ44    266  C~6Ip3      
2021 09  06.39352  19 05 17.604  -21 05 04.06  25.2r 21LZ44    266  C~6Ip3      
2022 10  20.21696  19 11 01.358  -20 58 20.03  23.9V 21LZ44    266  C~7um8      
2022 10  20.26058  19 11 01.446  -20 58 19.96  23.9V 21LZ44    266  C~7um8      
2022 10  20.29842  19 11 01.523  -20 58 19.90  23.9V 21LZ44    266  C~7um8      
2022 10  23.20599  19 11 08.016  -20 58 15.27  23.7V 21LZ44    266  C~7um8      
2022 10  23.25093  19 11 08.120  -20 58 15.17  23.7V 21LZ44    266  C~7um8      
2022 10  23.29489  19 11 08.222  -20 58 15.08  23.7V 21LZ44    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    -0.03       0.00    -0.00
     2   0.0002     -5.23    -0.04       0.08    -0.01
     3   0.0005    -10.71    -0.03       0.19     0.00
     4   0.0219   -507.67     0.03       6.12     0.04
     5   0.0221   -511.98     0.04       6.17     0.04
     6   0.0223   -517.28     0.04       6.24     0.04
     7   0.2431  -5375.13    -0.01     -60.52    -0.04
     8   0.2433  -5377.62    -0.01     -60.67    -0.04
     9   0.2435  -5380.11     0.00     -60.81    -0.04
    10   1.3628   -551.77     0.01    -222.52    -0.07
    11   1.3630   -550.54     0.02    -222.60    -0.07
    12   1.3631   -549.46     0.03    -222.68    -0.07
    13   1.3710   -458.63    -0.02    -229.13     0.07
    14   1.3711   -457.17    -0.02    -229.21     0.08
    15   1.3713   -455.74    -0.02    -229.29     0.08

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.

21LZ44    quality flag:2

Type:      CLASSICAL CLASSICAL  SCATNEAR

axisobj        43.570    44.928    43.461
ecceobj         0.037     0.134     0.061
incobj          1.653     1.655     1.653
qmin           41.433    38.421    38.225
qmax           46.378    52.366    49.691
amean          43.801    45.189    43.696
amin           43.462    44.815    43.294
amax           44.144    45.620    44.189
emean           0.035     0.132     0.080
emin            0.018     0.116     0.040
emax            0.051     0.148     0.125
imean           2.373     2.281     2.405
imin            1.666     1.617     1.300
imax            3.033     2.909     3.336
excite_mean     0.055     0.138     0.091
fracstop        1.000     1.000     1.000
cjmean          3.096     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       174.3     171.8     196.0
kozaiamp        179.9     180.0     180.0