Orbit Fit and Astrometric record for 19QA111

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: 19QA111   
# Created Tue Apr  1 01:11:15 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.11y
# First observation: 2019/08/29
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000009   0.023240  -0.000000   0.001338   0.023903   0.000000
# Chi-squared of fit:     1.60 DOF:     14 RMS:  0.07
# Min/Max residuals:    -0.14    0.09
# Exact a, adot, b, bdot, g, gdot:
  1.499397E-05  2.328531E-02  8.382566E-07  1.342511E-03  2.389137E-02  1.403319E-03
# Covariance matrix:
  6.2798E-13  5.4906E-13 -6.2304E-15  4.5120E-14  1.2758E-12  1.6204E-11
  5.4906E-13  4.6900E-12 -3.8547E-14  2.9403E-13  4.9493E-12  1.0524E-10
 -6.2304E-15 -3.8547E-14  3.5110E-13 -1.9335E-13 -4.2019E-14 -8.9993E-13
  4.5120E-14  2.9403E-13 -1.9335E-13  1.9833E-13  3.1336E-13  6.8809E-12
  1.2758E-12  4.9493E-12 -4.2019E-14  3.1336E-13  6.8116E-12  1.1232E-10
  1.6204E-11  1.0524E-10 -8.9993E-13  6.8809E-12  1.1232E-10  2.4624E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.717002   -9.376552    0.259449   -0.029071   -0.969963  2458724.712719
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:           51.83290 +/-     0.770
Argument of Peri:      274.47959 +/-     1.008
Long of Asc Node:       17.30459 +/-     0.007
Inclination:             3.68710 +/-     0.001
Eccentricity:         0.06936252 +/-    0.0018
Semi-Major Axis:     44.60056105 +/-    0.0106
Time of Perihelion: 2443056.1667 +/-     232.5
Perihelion:          41.50695356 +/-    0.0822
Aphelion:            47.69416854 +/-    0.0824
Period (y)              297.8645 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.19633910 +/-    0.0045
Ecliptic Y           -7.23729218 +/-    0.0008
Ecliptic Z           -1.25409267 +/-    0.0001
Ecliptic XDOT         0.00060635 +/-    0.0000
Ecliptic YDOT         0.00260638 +/-    0.0000
Ecliptic ZDOT         0.00014873 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.83085546 +/-    0.0044
Geocenter to KBO     41.85611287 +/-    0.0046
# Hcoef:  8.58

The following table shows the complete astrometric record for 19QA111. 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 (19QA111) followed by the observatory code and reference code for the source of the astrometry.

2019 08  29.211918 23 28 15.156  -05 17 38.75  24.7r 19QA111   W84  C~7XLi      
2019 08  29.387113 23 28 14.401  -05 17 43.49  24.7r 19QA111   W84  C~7XLi      
2019 09  27.014583 23 26 10.114  -05 30 35.36  24.8r 19QA111   W84  C~7XLi      
2019 09  27.176040 23 26 09.405  -05 30 39.62  24.8r 19QA111   W84  C~7XLi      
2020 10  16.001792 23 29 39.464  -05 02 37.36  24.8r 19QA111   W84  C~7XLi      
2020 10  16.175804 23 29 38.809  -05 02 41.14  24.8r 19QA111   W84  C~7XLi      
2021 09  05.096099 23 37 19.268  -04 09 10.41  24.9r 19QA111   W84  C~7XLi      
2021 09  05.195929 23 37 18.827  -04 09 13.40  24.9r 19QA111   W84  C~7XLi      
2021 10  07.004805 23 35 02.181  -04 23 19.00  24.8r 19QA111   W84  C~7XLi      
2021 10  07.169933 23 35 01.498  -04 23 23.06  24.8r 19QA111   W84  C~7XLi      

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     0.09       0.00     0.01
     2   0.0005    -12.23    -0.05       0.09    -0.00
     3   0.0789  -2022.31     0.06      21.38     0.02
     4   0.0793  -2033.72    -0.09      21.63    -0.01
     5   1.1329   1512.92     0.09     331.59     0.01
     6   1.1334   1502.43    -0.12     331.98    -0.04
     7   2.0202   9101.53     0.08     554.81     0.06
     8   2.0205   9094.27    -0.13     554.69    -0.14
     9   2.1076   6879.20     0.07     589.45     0.06
    10   2.1080   6868.20    -0.00     589.77     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.

19QA111    quality flag:2

Type:      CLASSICAL   9:5EEEE CLASSICAL

axisobj        44.617    44.656    44.579
ecceobj         0.067     0.070     0.064
incobj          3.683     3.683     3.683
qmin           41.011    40.871    41.104
qmax           48.234    48.492    48.032
amean          44.511    44.554    44.471
amin           44.158    44.202    44.118
amax           44.875    44.932    44.849
emean           0.060     0.069     0.058
emin            0.045     0.057     0.043
emax            0.075     0.080     0.072
imean           3.617     3.599     3.618
imin            2.997     2.940     2.997
imax            4.142     4.055     4.133
excite_mean     0.087     0.093     0.086
fracstop        1.000     1.000     1.000
cjmean          3.098     3.098     3.098

libcent 0      -180.0     178.6    -180.0
libamp  0      -180.0     111.3    -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       181.6     180.4     181.4
kozaiamp        180.0     180.0     180.0