Orbit Fit and Astrometric record for 19QD112

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: 19QD112   
# Created Tue Apr  1 01:11:15 2025
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   2.10y
# First observation: 2019/08/28
#  Last observation: 2021/10/04
Preliminary a, adot, b, bdot, g, gdot:
   0.000005   0.023651   0.000000  -0.000020   0.024273   0.000000
# Chi-squared of fit:     4.97 DOF:     20 RMS:  0.11
# Min/Max residuals:    -0.34    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.519357E-05  2.363221E-02  4.149896E-08 -1.951750E-05  2.422247E-02  1.856252E-04
# Covariance matrix:
  2.4626E-13  5.2711E-13  2.4606E-17 -5.7607E-16  5.7114E-13  1.3714E-11
  5.2711E-13  1.3734E-11  4.1944E-16 -1.3921E-14  7.3085E-12  3.2282E-10
  2.4606E-17  4.1944E-16  1.8735E-13 -9.1858E-14  2.6812E-16  9.7686E-15
 -5.7607E-16 -1.3921E-14 -9.1858E-14  1.1338E-13 -7.0304E-15 -3.3169E-13
  5.7114E-13  7.3085E-12  2.6812E-16 -7.0304E-15  5.7778E-12  1.6579E-10
  1.3714E-11  3.2282E-10  9.7686E-15 -3.3169E-13  1.6579E-10  7.6806E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.541350   -7.833205    0.301597   -0.009049   -0.958233  2458723.726051
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:           10.11625 +/-     9.934
Argument of Peri:      253.57678 +/-    10.364
Long of Asc Node:       87.62305 +/-     0.088
Inclination:             0.53180 +/-     0.000
Eccentricity:         0.02041012 +/-    0.0008
Semi-Major Axis:     43.11273612 +/-    0.0107
Time of Perihelion: 2455814.9805 +/-    2853.1
Perihelion:          42.23280015 +/-    0.0378
Aphelion:            43.99267208 +/-    0.0379
Period (y)              283.0848 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.80798466 +/-    0.0041
Ecliptic Y           -6.06269690 +/-    0.0006
Ecliptic Z           -0.39005636 +/-    0.0000
Ecliptic XDOT         0.00039327 +/-    0.0000
Ecliptic YDOT         0.00264392 +/-    0.0000
Ecliptic ZDOT        -0.00000263 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.24708296 +/-    0.0040
Geocenter to KBO     41.28397917 +/-    0.0041
# Hcoef:  7.48

The following table shows the complete astrometric record for 19QD112. 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 (19QD112) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.22525  23 32 04.84   -03 36 18.3   24.1V 19QD112   W84  C~7XLk      
2019 08  28.22698  23 32 04.83   -03 36 18.3         19QD112   W84  C~7XLk      
2019 08  28.25974  23 32 04.67   -03 36 19.4         19QD112   W84  C~7XLk      
2019 08  28.26147  23 32 04.69   -03 36 19.2         19QD112   W84  C~7XLk      
2019 08  28.32901  23 32 04.39   -03 36 21.1         19QD112   W84  C~7XLk      
2019 08  28.33074  23 32 04.40   -03 36 21.0         19QD112   W84  C~7XLk      
2019 09  29.013696 23 29 46.318  -03 51 09.68  23.4r 19QD112   W84  C~7XLk      
2019 09  29.177510 23 29 45.606  -03 51 14.21  23.4r 19QD112   W84  C~7XLk      
2021 09  06.108763 23 41 24.323  -02 36 16.82  23.3r 19QD112   W84  C~7XLk      
2021 09  06.196686 23 41 23.925  -02 36 19.32  23.3r 19QD112   W84  C~7XLk      
2021 10  04.00906  23 39 22.52   -02 49 23.0   24.4V 19QD112   W84  C~7XLk      
2021 10  04.06495  23 39 22.27   -02 49 24.7   23.9V 19QD112   W84  C~7XLk      
2021 10  04.09253  23 39 22.15   -02 49 25.4   23.8V 19QD112   W84  C~7XLk      

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     0.05       0.00    -0.01
     2   0.0000     -0.14     0.03       0.06     0.05
     3   0.0001     -2.77    -0.34      -0.01    -0.02
     4   0.0001     -2.42     0.13       0.06     0.04
     5   0.0003     -7.29    -0.08       0.09     0.05
     6   0.0003     -7.12     0.21       0.12     0.09
     7   0.0870  -2257.01     0.01      -1.00    -0.07
     8   0.0875  -2268.59    -0.01      -0.96    -0.13
     9   2.0257   9126.91     0.09     -10.50    -0.11
    10   2.0259   9120.43    -0.09     -10.42    -0.06
    11   2.1021   7136.68     0.16      -8.23     0.11
    12   2.1022   7132.56    -0.07      -8.31     0.00
    13   2.1023   7130.63    -0.09      -8.24     0.05

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.

19QD112    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.167    43.221    43.118
ecceobj         0.022     0.025     0.022
incobj          0.531     0.531     0.531
qmin           41.105    41.214    40.949
qmax           45.110    45.171    45.213
amean          43.053    43.108    43.003
amin           42.727    42.773    42.675
amax           43.388    43.444    43.339
emean           0.025     0.024     0.027
emin            0.003     0.003     0.005
emax            0.040     0.040     0.044
imean           1.608     1.595     1.627
imin            0.490     0.522     0.458
imax            2.266     2.244     2.296
excite_mean     0.038     0.037     0.040
fracstop        1.000     1.000     1.000
cjmean          3.088     3.089     3.088

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       189.6     181.5     196.2
kozaiamp        179.9     179.9     180.0