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 Mon Apr 28 01:11:17 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