Orbit Fit and Astrometric record for 21LY44

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: 21LY44    
# 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: 2022/10/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000012   0.022283  -0.000004  -0.001461   0.022579   0.000000
# Chi-squared of fit:     0.28 DOF:     30 RMS:  0.02
# Min/Max residuals:    -0.03    0.06
# Exact a, adot, b, bdot, g, gdot:
  1.563057E-05  2.244412E-02 -1.171047E-06 -1.527212E-03  2.279621E-02  7.824929E-03
# Covariance matrix:
  3.4551E-13  9.1193E-13  5.1219E-14 -7.6544E-13  1.7494E-12  2.8916E-10
  9.1193E-13  1.0525E-11  5.8534E-13 -8.8057E-12  1.7906E-11  3.3114E-09
  5.1219E-14  5.8534E-13  2.2112E-13 -6.6661E-13  1.0296E-12  1.9626E-10
 -7.6544E-13 -8.8057E-12 -6.6661E-13  8.0776E-12 -1.5498E-11 -2.9574E-09
  1.7494E-12  1.7906E-11  1.0296E-12 -1.5498E-11  3.1201E-11  5.8259E-09
  2.8916E-10  3.3114E-09  1.9626E-10 -2.9574E-09  5.8259E-09  1.1109E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.521864  -73.226871    0.486331    0.023353   -0.887082  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:           34.09117 +/-     2.415
Argument of Peri:       86.39413 +/-     2.205
Long of Asc Node:      127.33980 +/-     0.017
Inclination:             4.12153 +/-     0.003
Eccentricity:         0.39084492 +/-    0.0498
Semi-Major Axis:     59.08716445 +/-    2.7331
Time of Perihelion: 2443660.4511 +/-     224.4
Perihelion:          35.99324642 +/-    3.3798
Aphelion:            82.18108249 +/-    4.8064
Period (y)              454.2008 +/-     31.51
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.45352915 +/-    0.0031
Ecliptic Y          -42.98056495 +/-    0.0103
Ecliptic Z            1.16506225 +/-    0.0003
Ecliptic XDOT         0.00285897 +/-    0.0000
Ecliptic YDOT        -0.00011913 +/-    0.0001
Ecliptic ZDOT        -0.00015858 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.76356466 +/-    0.0099
Geocenter to KBO     43.86694757 +/-    0.0107
# Hcoef:  8.47

The following table shows the complete astrometric record for 21LY44. 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 (21LY44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 11 56.139  -20 52 34.89  25.5r 21LY44    266  C~6Ip3      
2021 06  09.52601  19 11 55.791  -20 52 35.48  25.5r 21LY44    266  C~6Ip3      
2021 06  09.61426  19 11 55.426  -20 52 36.08  25.5r 21LY44    266  C~6Ip3      
2021 06  17.43605  19 11 22.376  -20 53 33.10  25.7r 21LY44    266  C~6Ip3      
2021 06  17.50053  19 11 22.088  -20 53 33.60  25.7r 21LY44    266  C~6Ip3      
2021 06  17.57953  19 11 21.736  -20 53 34.19  25.7r 21LY44    266  C~6Ip3      
2021 09  06.23258  19 05 59.356  -21 04 28.83  26.0r 21LY44    266  C~6Ip3      
2021 09  06.31281  19 05 59.190  -21 04 29.29  26.0r 21LY44    266  C~6Ip3      
2021 09  06.39352  19 05 59.025  -21 04 29.74  26.0r 21LY44    266  C~6Ip3      
2022 10  20.21696  19 11 22.969  -21 02 38.97  24.5V 21LY44    266  C~7um8      
2022 10  20.26058  19 11 23.050  -21 02 38.93  24.5V 21LY44    266  C~7um8      
2022 10  20.29842  19 11 23.122  -21 02 38.89  24.5V 21LY44    266  C~7um8      
2022 10  21.20926  19 11 24.934  -21 02 38.32  24.4V 21LY44    266  C~7um8      
2022 10  21.25420  19 11 25.022  -21 02 38.28  24.4V 21LY44    266  C~7um8      
2022 10  21.29846  19 11 25.110  -21 02 38.23  24.4V 21LY44    266  C~7um8      
2022 10  23.20599  19 11 29.163  -21 02 36.38  24.3V 21LY44    266  C~7um8      
2022 10  23.25093  19 11 29.260  -21 02 36.32  24.3V 21LY44    266  C~7um8      
2022 10  23.29489  19 11 29.355  -21 02 36.26  24.3V 21LY44    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     0.02
     2   0.0002     -4.91    -0.02       0.01     0.02
     3   0.0005    -10.06    -0.02       0.05     0.01
     4   0.0219   -476.74     0.02       0.15    -0.01
     5   0.0221   -480.81     0.01       0.15    -0.01
     6   0.0223   -485.77     0.02       0.17    -0.01
     7   0.2431  -5047.45     0.00    -118.02    -0.01
     8   0.2433  -5049.82    -0.00    -118.22    -0.01
     9   0.2435  -5052.16    -0.00    -118.40    -0.01
    10   1.3628   -535.09     0.01    -542.65     0.05
    11   1.3630   -533.96     0.00    -542.75     0.05
    12   1.3631   -532.95     0.02    -542.84     0.06
    13   1.3656   -507.71     0.00    -545.37    -0.02
    14   1.3657   -506.48     0.00    -545.48    -0.02
    15   1.3658   -505.25     0.01    -545.58    -0.02
    16   1.3710   -448.71    -0.02    -550.67    -0.03
    17   1.3711   -447.35    -0.01    -550.78    -0.03
    18   1.3713   -446.03    -0.01    -550.88    -0.03

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.

21LY44    quality flag:1

Type:       SCATNEAR  7:2EEEEE  SCATNEAR

axisobj        58.112    68.209    52.237
ecceobj         0.384     0.513     0.255
incobj          4.129     4.139     4.119
qmin           35.258    32.577    38.403
qmax           83.471   109.085    67.517
amean          58.552    69.408    52.634
amin           57.650    68.068    52.104
amax           59.666    71.156    53.248
emean           0.385     0.521     0.257
emin            0.372     0.510     0.246
emax            0.399     0.533     0.268
imean           2.759     2.816     2.755
imin            2.087     2.638     2.417
imax            3.535     2.939     3.149
excite_mean     0.388     0.523     0.262
fracstop        1.000     1.000     1.000
cjmean          3.085     3.023     3.124

libcent 0      -180.0     180.1    -180.0
libamp  0      -180.0     152.7    -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       180.7     163.7     192.8
kozaiamp        180.0     179.9     180.0