Orbit Fit and Astrometric record for 20LA21

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: 20LA21    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:  24.18d
# First observation: 2020/06/01
#  Last observation: 2020/06/25
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.026212  -0.000000  -0.001112   0.024473   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit:     0.11 DOF:     19 RMS:  0.02
# Min/Max residuals:    -0.03    0.04
# Exact a, adot, b, bdot, g, gdot:
  1.534299E-05  2.313869E-02 -7.018781E-07 -1.043819E-03  2.384129E-02  3.143732E-03
# Covariance matrix:
  2.4473E-12  3.0450E-09 -9.5664E-14 -6.6817E-11  5.9365E-10  3.4877E-08
  3.0450E-09  4.7470E-06 -1.4832E-10 -1.0382E-07  9.2063E-07  5.2222E-05
 -9.5664E-14 -1.4832E-10  4.7356E-13 -4.7414E-12 -2.8794E-11 -1.6555E-09
 -6.6817E-11 -1.0382E-07 -4.7414E-12  2.4546E-09 -2.0141E-08 -1.1460E-06
  5.9365E-10  9.2063E-07 -2.8794E-11 -2.0141E-08  1.7872E-07  1.0263E-05
  3.4877E-08  5.2222E-05 -1.6555E-09 -1.1460E-06  1.0263E-05  6.8681E-04
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.506556  -72.297811    0.607207    0.035123   -0.805283  2459001.933491
# Heliocentric elements and errors
Epoch:              2459000.5000  =  2020/05/31
Mean Anomaly:           61.31601 +/-    50.942
Argument of Peri:       60.60650 +/-    70.632
Long of Asc Node:      151.01478 +/-     2.423
Inclination:             3.52925 +/-     0.156
Eccentricity:         0.12884823 +/-    1.1697
Semi-Major Axis:     44.91336923 +/-   20.1049
Time of Perihelion: 2440275.0068 +/-    9161.9
Perihelion:          39.12636129 +/-   55.3780
Aphelion:            50.70037716 +/-   57.2281
Period (y)              301.0036 +/-    202.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.41400443 +/-    0.2259
Ecliptic Y          -40.87909780 +/-    0.7079
Ecliptic Z            1.83440950 +/-    0.0325
Ecliptic XDOT         0.00265072 +/-    0.0011
Ecliptic YDOT         0.00046296 +/-    0.0028
Ecliptic ZDOT        -0.00010420 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   42.76181943 +/-    0.6799
Geocenter to KBO     41.94404255 +/-    0.7437
# Hcoef:  9.93

The following table shows the complete astrometric record for 20LA21. 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 (20LA21) followed by the observatory code and reference code for the source of the astrometry.

2020 06  01.43269  19 15 20.215  -19 46 57.96  26.3r 20LA21    266  C~6c5e      
2020 06  01.47325  19 15 20.059  -19 46 58.19  26.3r 20LA21    266  C~6c5e      
2020 06  01.60571  19 15 19.548  -19 46 58.89  26.3r 20LA21    266  C~6c5e      
2020 06  20.45583  19 13 59.258  -19 49 03.65  26.4r 20LA21    266  C~6c5e      
2020 06  20.52860  19 13 58.913  -19 49 04.22  26.4r 20LA21    266  C~6c5e      
2020 06  20.62233  19 13 58.469  -19 49 04.93  26.4r 20LA21    266  C~6c5e      
2020 06  22.44948  19 13 49.916  -19 49 19.36  26.0r 20LA21    266  C~6c5e      
2020 06  22.52092  19 13 49.573  -19 49 19.93  26.0r 20LA21    266  C~6c5e      
2020 06  22.59118  19 13 49.236  -19 49 20.48  26.0r 20LA21    266  C~6c5e      
2020 06  25.44823  19 13 35.658  -19 49 43.88  25.9r 20LA21    266  C~6c5e      
2020 06  25.53213  19 13 35.249  -19 49 44.58  25.9r 20LA21    266  C~6c5e      
2020 06  25.61487  19 13 34.846  -19 49 45.24  25.9r 20LA21    266  C~6c5e      

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   0.0001     -2.21    -0.00       0.05    -0.01
     3   0.0005     -9.46     0.00       0.29    -0.01
     4   0.0521  -1149.27    -0.00      21.07    -0.01
     5   0.0523  -1154.17     0.00      21.12    -0.01
     6   0.0525  -1160.48    -0.00      21.21    -0.01
     7   0.0575  -1282.03    -0.00      22.16     0.04
     8   0.0577  -1286.91     0.00      22.20     0.04
     9   0.0579  -1291.70     0.00      22.26     0.04
    10   0.0658  -1484.72    -0.00      23.21    -0.02
    11   0.0660  -1490.54     0.00      23.25    -0.03
    12   0.0662  -1496.26    -0.00      23.31    -0.02

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.

20LA21    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