Orbit Fit and Astrometric record for 21LG44

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: 21LG44    
# Created Tue Apr  1 01:11:25 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:  88.95d
# First observation: 2021/06/09
#  Last observation: 2021/09/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000007   0.036700  -0.000003  -0.000191   0.025738   0.000000
# Chi-squared of fit:     0.01 DOF:     18 RMS:  0.01
# Min/Max residuals:    -0.01    0.01
# Exact a, adot, b, bdot, g, gdot:
  1.486821E-05  2.179799E-02 -1.914648E-07 -2.481563E-04  2.316150E-02  1.300741E-03
# Covariance matrix:
  3.6120E-13 -3.7975E-12  3.1117E-16 -2.7316E-14  7.5841E-13  2.5577E-10
 -3.7975E-12  2.6641E-07 -5.8404E-11  1.0542E-09  4.3401E-08 -1.2046E-06
  3.1117E-16 -5.8404E-11  2.2876E-13 -1.3575E-12 -9.5175E-12  2.6363E-10
 -2.7316E-14  1.0542E-09 -1.3575E-12  1.7773E-11  1.7162E-10 -4.7951E-09
  7.5841E-13  4.3401E-08 -9.5175E-12  1.7162E-10  7.0808E-09 -1.9425E-07
  2.5577E-10 -1.2046E-06  2.6363E-10 -4.7951E-09 -1.9425E-07  5.8557E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.725296  -72.638586    0.495416    0.010954   -0.882281  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:           89.97932 +/-    32.551
Argument of Peri:       36.87754 +/-    28.982
Long of Asc Node:      154.54200 +/-     0.917
Inclination:             0.95908 +/-     0.014
Eccentricity:         0.04638483 +/-    0.1125
Semi-Major Axis:     43.97284941 +/-    0.9039
Time of Perihelion: 2432750.0420 +/-    9595.2
Perihelion:          41.93317610 +/-    5.0200
Aphelion:            46.01252272 +/-    5.0350
Period (y)              291.5984 +/-      8.99
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.68104064 +/-    0.0468
Ecliptic Y          -42.19957053 +/-    0.1497
Ecliptic Z            0.54659960 +/-    0.0020
Ecliptic XDOT         0.00251085 +/-    0.0000
Ecliptic YDOT         0.00062891 +/-    0.0003
Ecliptic ZDOT        -0.00002757 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.06712284 +/-    0.1440
Geocenter to KBO     43.17510571 +/-    0.1569
# Hcoef:  9.71

The following table shows the complete astrometric record for 21LG44. 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 (21LG44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 14 52.080  -21 35 34.74  26.1r 21LG44    266  C~6Ip2      
2021 06  09.52741  19 14 51.718  -21 35 35.35  26.1r 21LG44    266  C~6Ip2      
2021 06  09.61426  19 14 51.350  -21 35 35.96  26.1r 21LG44    266  C~6Ip2      
2021 06  17.43605  19 14 17.477  -21 36 34.23  26.4r 21LG44    266  C~6Ip2      
2021 06  17.50053  19 14 17.182  -21 36 34.73  26.4r 21LG44    266  C~6Ip2      
2021 06  17.57953  19 14 16.821  -21 36 35.34  26.4r 21LG44    266  C~6Ip2      
2021 07  05.35106  19 12 52.835  -21 39 02.11  25.8r 21LG44    266  C~6Ip2      
2021 07  05.43951  19 12 52.396  -21 39 02.88  25.8r 21LG44    266  C~6Ip2      
2021 07  05.52517  19 12 51.972  -21 39 03.61  25.8r 21LG44    266  C~6Ip2      
2021 09  06.23258  19 08 41.924  -21 46 44.92  26.0r 21LG44    266  C~6Ip2      
2021 09  06.31281  19 08 41.746  -21 46 45.28  26.0r 21LG44    266  C~6Ip2      
2021 09  06.39352  19 08 41.569  -21 46 45.62  26.0r 21LG44    266  C~6Ip2      

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     0.00
     2   0.0002     -5.09    -0.00       0.04     0.01
     3   0.0005    -10.25    -0.00       0.09     0.00
     4   0.0219   -486.24    -0.00       2.38    -0.01
     5   0.0221   -490.38    -0.00       2.40    -0.01
     6   0.0223   -495.46     0.00       2.43    -0.01
     7   0.0709  -1675.73     0.00       3.92     0.01
     8   0.0712  -1681.90    -0.01       3.91     0.01
     9   0.0714  -1687.86     0.01       3.93     0.00
    10   0.2431  -5203.69     0.00     -31.92    -0.00
    11   0.2433  -5206.19    -0.00     -31.99    -0.00
    12   0.2435  -5208.68     0.00     -32.04     0.00

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.

21LG44    quality flag:1

Type:      CLASSICAL  SCATNEAR  SCATNEAR

axisobj        43.479    50.091    41.996
ecceobj         0.046     0.253     0.148
incobj          0.958     0.922     0.982
qmin           40.225    36.879    34.543
qmax           47.446    64.327    50.866
amean          43.707    50.297    42.367
amin           43.348    49.793    41.766
amax           44.118    50.885    42.982
emean           0.045     0.252     0.149
emin            0.022     0.239     0.120
emax            0.077     0.265     0.186
imean           1.829     1.669     7.488
imin            1.014     1.207     1.130
imax            2.540     2.118    12.922
excite_mean     0.056     0.254     0.202
fracstop        1.000     1.000     1.000
cjmean          3.094     3.098     3.034

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       173.1     187.6     178.5
kozaiamp        180.0     180.0     180.0