Orbit Fit and Astrometric record for 21LK44

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: 21LK44    
# 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:
  -0.000009   0.041933  -0.000003   0.007239   0.026460   0.000000
# Chi-squared of fit:     0.03 DOF:     18 RMS:  0.01
# Min/Max residuals:    -0.02    0.02
# Exact a, adot, b, bdot, g, gdot:
  1.673098E-05  2.489441E-02  4.780631E-06  7.219651E-03  2.353118E-02  9.208823E-03
# Covariance matrix:
  3.6089E-13 -1.0273E-11 -8.4972E-15  4.6889E-13 -3.0103E-13  2.8714E-10
 -1.0273E-11  2.7385E-07 -4.9069E-11 -5.8007E-10  4.4690E-08 -1.2228E-06
 -8.4972E-15 -4.9069E-11  2.2556E-13 -1.0553E-12 -8.0914E-12  2.0184E-10
  4.6889E-13 -5.8007E-10 -1.0553E-12  1.6262E-11 -9.0960E-11  3.3564E-09
 -3.0103E-13  4.4690E-08 -8.0914E-12 -9.0960E-11  7.3031E-09 -1.9753E-07
  2.8714E-10 -1.2228E-06  2.0184E-10  3.3564E-09 -1.9753E-07  5.8803E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.119649  -72.390981    0.499224    0.016984   -0.880036  2459374.942811
# Heliocentric elements and errors
Epoch:              2459370.5000  =  2021/06/05
Mean Anomaly:           12.81893 +/-     2.629
Argument of Peri:      311.25422 +/-    10.103
Long of Asc Node:      283.16049 +/-     0.078
Inclination:            16.12560 +/-     0.306
Eccentricity:         0.57776392 +/-    0.0775
Semi-Major Axis:     87.92953428 +/-   10.0030
Time of Perihelion: 2448646.6681 +/-    1220.3
Perihelion:          37.12702183 +/-    8.0137
Aphelion:           138.73204672 +/-   17.1891
Period (y)              824.5374 +/-    140.70
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.65244568 +/-    0.0467
Ecliptic Y          -41.49254077 +/-    0.1471
Ecliptic Z            0.83068134 +/-    0.0030
Ecliptic XDOT         0.00308542 +/-    0.0000
Ecliptic YDOT        -0.00012204 +/-    0.0003
Ecliptic ZDOT         0.00086059 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.38669557 +/-    0.1413
Geocenter to KBO     42.49681304 +/-    0.1543
# Hcoef:  8.40

The following table shows the complete astrometric record for 21LK44. 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 (21LK44) followed by the observatory code and reference code for the source of the astrometry.

2021 06  09.44201  19 15 42.316  -21 10 12.42  24.7r 21LK44    266  C~6Ip2      
2021 06  09.52741  19 15 41.956  -21 10 12.65  24.7r 21LK44    266  C~6Ip2      
2021 06  09.61426  19 15 41.591  -21 10 12.86  24.7r 21LK44    266  C~6Ip2      
2021 06  17.43605  19 15 07.914  -21 10 36.33  24.6r 21LK44    266  C~6Ip2      
2021 06  17.50053  19 15 07.620  -21 10 36.55  24.6r 21LK44    266  C~6Ip2      
2021 06  17.57953  19 15 07.260  -21 10 36.81  24.6r 21LK44    266  C~6Ip2      
2021 07  05.35106  19 13 43.617  -21 11 46.98  24.5r 21LK44    266  C~6Ip2      
2021 07  05.43951  19 13 43.179  -21 11 47.38  24.5r 21LK44    266  C~6Ip2      
2021 07  05.52517  19 13 42.756  -21 11 47.75  24.5r 21LK44    266  C~6Ip2      
2021 09  06.23258  19 09 34.246  -21 15 26.08  25.0r 21LK44    266  C~6Ip2      
2021 09  06.31281  19 09 34.072  -21 15 26.15  25.0r 21LK44    266  C~6Ip2      
2021 09  06.39352  19 09 33.898  -21 15 26.21  25.0r 21LK44    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     0.01
     2   0.0002     -5.02    -0.01       0.42     0.01
     3   0.0005    -10.11     0.00       0.87     0.02
     4   0.0219   -480.27     0.01      38.17    -0.01
     5   0.0221   -484.38     0.00      38.48    -0.01
     6   0.0223   -489.41    -0.00      38.86    -0.01
     7   0.0709  -1658.72     0.00     117.88    -0.01
     8   0.0712  -1664.85    -0.01     118.26    -0.01
     9   0.0714  -1670.76    -0.00     118.64    -0.02
    10   0.2431  -5147.07    -0.00     328.31     0.00
    11   0.2433  -5149.50     0.00     328.53     0.01
    12   0.2435  -5151.92     0.00     328.76     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.

21LK44    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0