Orbit Fit and Astrometric record for 19QS109

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: 19QS109   
# Created Tue Apr  1 01:11:14 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.10y
# First observation: 2019/08/28
#  Last observation: 2021/10/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000001   0.020271  -0.000000   0.000337   0.022352   0.000000
# Chi-squared of fit:     0.84 DOF:     10 RMS:  0.06
# Min/Max residuals:    -0.12    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.423383E-05  2.029082E-02  3.441458E-07  3.371167E-04  2.235913E-02  8.026248E-04
# Covariance matrix:
  7.3937E-13  5.7501E-13 -1.3379E-15  1.1866E-14  1.4997E-12  1.7006E-11
  5.7501E-13  4.0939E-12 -9.0590E-15  7.3652E-14  4.4563E-12  1.0747E-10
 -1.3379E-15 -9.0590E-15  3.5650E-13 -2.0736E-13 -9.1609E-15 -2.6416E-13
  1.1866E-14  7.3652E-14 -2.0736E-13  2.5046E-13  7.7100E-14  2.1262E-12
  1.4997E-12  4.4563E-12 -9.1609E-15  7.7100E-14  6.7370E-12  1.1168E-10
  1.7006E-11  1.0747E-10 -2.6416E-13  2.1262E-12  1.1168E-10  3.1091E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.392434   -8.130576    0.296857    0.006577   -0.959734  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          138.19056 +/-     2.078
Argument of Peri:      239.77422 +/-     2.076
Long of Asc Node:      329.41686 +/-     0.031
Inclination:             1.02225 +/-     0.001
Eccentricity:         0.05655851 +/-    0.0016
Semi-Major Axis:     43.78441417 +/-    0.0110
Time of Perihelion: 2418099.2187 +/-     610.7
Perihelion:          41.30803316 +/-    0.0724
Aphelion:            46.26079517 +/-    0.0726
Period (y)              289.7260 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           45.18481677 +/-    0.0051
Ecliptic Y           -6.76179343 +/-    0.0008
Ecliptic Z            0.30634462 +/-    0.0000
Ecliptic XDOT         0.00045686 +/-    0.0000
Ecliptic YDOT         0.00244632 +/-    0.0000
Ecliptic ZDOT         0.00004173 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.68898515 +/-    0.0051
Geocenter to KBO     44.72445957 +/-    0.0052
# Hcoef:  8.79

The following table shows the complete astrometric record for 19QS109. 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 (19QS109) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 29 30.592  -02 51 51.78  25.3r 19QS109   W84  C~7XLg      
2019 08  28.388381 23 29 29.881  -02 51 56.18  25.3r 19QS109   W84  C~7XLg      
2019 09  29.013696 23 27 20.863  -03 05 37.82  25.2r 19QS109   W84  C~7XLg      
2019 09  29.177510 23 27 20.203  -03 05 42.20  25.2r 19QS109   W84  C~7XLg      
2020 10  21.004397 23 30 12.829  -02 45 59.28  25.3r 19QS109   W84  C~7XLg      
2020 10  21.174149 23 30 12.268  -02 46 02.96  25.3r 19QS109   W84  C~7XLg      
2021 10  03.011907 23 35 33.400  -02 10 17.92  25.4r 19QS109   W84  C~7XLg      
2021 10  03.165173 23 35 32.790  -02 10 21.86  25.4r 19QS109   W84  C~7XLg      

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     0.02       0.00    -0.02
     2   0.0005    -11.52    -0.03       0.16     0.00
     3   0.0871  -2111.64     0.01       6.55     0.08
     4   0.0875  -2122.46    -0.01       6.42    -0.12
     5   1.1493    720.52     0.08      74.40     0.11
     6   1.1498    711.34    -0.08      74.33     0.01
     7   2.0994   5981.44    -0.01     144.67    -0.00
     8   2.0998   5971.47     0.01     144.67    -0.06

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.

19QS109    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.829    43.865    43.793
ecceobj         0.052     0.054     0.051
incobj          1.030     1.029     1.030
qmin           40.439    39.251    39.222
qmax           47.279    48.537    48.678
amean          43.717    43.745    43.707
amin           43.355    43.328    43.329
amax           44.115    44.138    44.151
emean           0.050     0.065     0.065
emin            0.029     0.033     0.031
emax            0.073     0.100     0.103
imean           2.585     2.520     2.541
imin            1.783     1.591     1.640
imax            3.298     3.333     3.358
excite_mean     0.068     0.080     0.080
fracstop        1.000     1.000     1.000
cjmean          3.093     3.091     3.090

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       174.1     178.8     179.2
kozaiamp        180.0     180.0     180.0