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: 17QU131 # Created Wed Dec 4 02:10:51 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 8 observations of 8 # Arc: 5.07y # First observation: 2013/10/11 # Last observation: 2018/11/06 # Chi-squared of fit: 5.48 DOF: 10 RMS: 0.15 # Min/Max residuals: -0.29 0.28 # Exact a, adot, b, bdot, g, gdot: 1.615340E-05 2.744567E-02 -7.007122E-06 -1.101424E-02 2.657972E-02 3.992558E-03 # Covariance matrix: 1.3759E-12 -8.0943E-13 -1.6227E-13 2.2777E-13 -2.1574E-13 -4.0577E-12 -8.0943E-13 9.9838E-13 2.7121E-13 -3.7747E-13 2.6480E-13 6.7273E-12 -1.6227E-13 2.7121E-13 1.1153E-12 -3.6400E-13 6.4281E-14 1.9769E-12 2.2777E-13 -3.7747E-13 -3.6400E-13 2.3007E-13 -1.1038E-13 -2.7521E-12 -2.1574E-13 2.6480E-13 6.4281E-14 -1.1038E-13 6.8630E-13 1.9487E-12 -4.0577E-12 6.7273E-12 1.9769E-12 -2.7521E-12 1.9487E-12 4.9048E-11 # lat0 lon0 xBary yBary zBary JD0 -7.785393 10.772252 -0.120915 -0.134083 -0.981582 2456576.723078 # Heliocentric elements and errors Epoch: 2456576.5000 = 2013/10/11 Mean Anomaly: 21.78966 +/- 0.022 Argument of Peri: 161.85919 +/- 0.044 Long of Asc Node: 172.76751 +/- 0.001 Inclination: 23.10570 +/- 0.000 Eccentricity: 0.26585198 +/- 0.0002 Semi-Major Axis: 50.26679078 +/- 0.0114 Time of Perihelion: 2448697.5552 +/- 8.5 Perihelion: 36.90326487 +/- 0.0144 Aphelion: 63.63031669 +/- 0.0186 Period (y) 356.3936 +/- 0.12 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 37.56900847 +/- 0.0011 Ecliptic Y 7.27404196 +/- 0.0002 Ecliptic Z -5.09678040 +/- 0.0002 Ecliptic XDOT -0.00028525 +/- 0.0000 Ecliptic YDOT 0.00282323 +/- 0.0000 Ecliptic ZDOT -0.00117964 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 38.60456448 +/- 0.0011 Geocenter to KBO 37.62262208 +/- 0.0012 # Hcoef: 7.81
The following table shows the complete astrometric record for 17QU131. 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 (17QU131) followed by the observatory code and reference code for the source of the astrometry.
2013 10 11.22230 00 51 47.613 -02 54 06.29 23.9g 17QU131 W84 C~52bv 2015 12 05.05359 01 01 47.853 -03 09 57.06 23.9r 17QU131 W84 C~52bv 2016 09 01.36019 01 14 37.780 -02 23 11.29 24.3g 17QU131 W84 C~52bv 2017 08 22.42110 01 21 37.589 -02 14 56.40 23.1i 17QU131 W84 C~52bv 2017 08 28.34592 01 21 22.072 -02 18 19.85 23.6i 17QU131 W84 C~52bv 2017 09 18.27315 01 20 08.680 -02 31 10.29 23.7r 17QU131 W84 C~52bv 2018 11 06.19384 01 23 00.060 -02 55 23.65 23.8r 17QU131 W84 C~52bv 2018 11 06.19522 01 23 00.048 -02 55 23.67 23.6i 17QU131 W84 C~52bv
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 0.10
2 2.1488 0.00 -0.00 0.00 -0.07
3 2.8915 0.00 0.05 0.00 -0.29
4 3.8637 0.00 -0.14 0.00 -0.19
5 3.8799 0.00 0.17 0.00 0.22
6 3.9372 0.00 -0.04 0.00 0.28
7 5.0704 0.00 0.05 0.00 -0.03
8 5.0704 0.00 -0.04 0.00 -0.01
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.
17QU131 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 50.634 50.634 50.634 ecceobj 0.272 0.272 0.272 incobj 23.044 23.044 23.044 qmin 35.373 35.394 35.373 qmax 65.726 65.752 65.724 amean 50.282 50.282 50.282 amin 49.799 49.810 49.819 amax 50.860 50.883 50.901 emean 0.275 0.275 0.275 emin 0.256 0.256 0.256 emax 0.294 0.293 0.294 imean 22.238 22.238 22.238 imin 21.538 21.542 21.538 imax 22.768 22.774 22.766 excite_mean 0.468 0.468 0.468 fracstop 1.000 1.000 1.000 cjmean 2.898 2.898 2.898 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 191.0 190.9 191.0 kozaiamp 179.9 179.8 179.9