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: 17QB220 # Created Sun Oct 19 01:11:50 2025 # Orbit generated from Bernstein formalism # Fitting 12 observations of 12 # Arc: 55.91d # First observation: 2017/06/24 # Last observation: 2017/08/19 Preliminary a, adot, b, bdot, g, gdot: -0.000001 0.023310 -0.000000 -0.004406 0.023731 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 4.83 DOF: 19 RMS: 0.11 # Min/Max residuals: -0.19 0.20 # Exact a, adot, b, bdot, g, gdot: 1.428640E-05 2.179579E-02 -2.862548E-06 -4.103702E-03 2.315853E-02 -8.893362E-03 # Covariance matrix: 8.4672E-13 8.3338E-10 -1.2152E-13 -1.6894E-10 1.8458E-10 3.7377E-09 8.3338E-10 1.2562E-06 -1.8274E-10 -2.5407E-07 2.7738E-07 5.5447E-06 -1.2152E-13 -1.8274E-10 3.1785E-13 3.5031E-11 -4.0393E-11 -8.2210E-10 -1.6894E-10 -2.5407E-07 3.5031E-11 5.1406E-08 -5.6086E-08 -1.1168E-06 1.8458E-10 2.7738E-07 -4.0393E-11 -5.6086E-08 6.2025E-08 1.5012E-06 3.7377E-09 5.5447E-06 -8.2210E-10 -1.1168E-06 1.5012E-06 1.2297E-04 # lat0 lon0 xBary yBary zBary JD0 15.486985 -23.223704 0.906899 0.119725 -0.431834 2457928.969491 # Heliocentric elements and errors Epoch: 2457920.5000 = 2017/06/16 Mean Anomaly: 316.09053 +/- 35.374 Argument of Peri: 214.50287 +/- 10.834 Long of Asc Node: 210.38424 +/- 0.472 Inclination: 18.53050 +/- 0.102 Eccentricity: 0.42020849 +/- 0.4953 Semi-Major Axis: 52.67461473 +/- 24.5891 Time of Perihelion: 2474952.1297 +/- 6784.9 Perihelion: 30.54029456 +/- 29.7302 Aphelion: 74.80893490 +/- 43.5908 Period (y) 382.3052 +/- 267.70 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 38.29271197 +/- 0.4112 Ecliptic Y -17.42348235 +/- 0.1765 Ecliptic Z 11.53002375 +/- 0.1240 Ecliptic XDOT 0.00020837 +/- 0.0012 Ecliptic YDOT 0.00271035 +/- 0.0005 Ecliptic ZDOT -0.00074837 +/- 0.0003 # Distances at JD0 (AU) Heliocenter to KBO 43.62168010 +/- 0.3693 Geocenter to KBO 43.18063585 +/- 0.4644 # Hcoef: 8.51
The following table shows the complete astrometric record for 17QB220. 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 (17QB220) followed by the observatory code and reference code for the source of the astrometry.
2017 06 24.46869 22 11 15.41 +05 23 02.0 24.5i 17QB220 T09 C~98Q8 2017 06 24.47671 22 11 15.39 +05 23 02.0 25.2i 17QB220 T09 C~98Q8 2017 06 24.48472 22 11 15.38 +05 23 02.0 24.4i 17QB220 T09 C~98Q8 2017 06 24.48739 22 11 15.35 +05 23 02.2 24.6i 17QB220 T09 C~98Q8 2017 06 24.49006 22 11 15.36 +05 23 02.0 24.6i 17QB220 T09 C~98Q8 2017 08 18.32426 22 08 09.27 +05 15 00.4 25.4g 17QB220 T09 C~98Q8 2017 08 18.32705 22 08 09.26 +05 15 00.4 25.3g 17QB220 T09 C~98Q8 2017 08 18.33750 22 08 09.20 +05 15 00.2 25.6g 17QB220 T09 C~98Q8 2017 08 18.35014 22 08 09.16 +05 15 00.1 25.7g 17QB220 T09 C~98Q8 2017 08 19.34367 22 08 04.86 +05 14 36.4 24.4r 17QB220 T09 C~98Q8 2017 08 19.35710 22 08 04.79 +05 14 35.9 25.1r 17QB220 T09 C~98Q8 2017 08 19.37811 22 08 04.70 +05 14 35.6 24.5r 17QB220 T09 C~98Q8
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 0.12 0.00 0.01
2 0.0000 -0.28 0.04 0.11 -0.02
3 0.0000 -0.42 0.09 0.16 -0.10
4 0.0001 -0.76 -0.19 0.52 0.20
5 0.0001 -0.69 -0.06 0.27 -0.09
6 0.1502 -2762.55 0.01 574.57 -0.18
7 0.1502 -2762.69 0.07 574.62 -0.13
8 0.1502 -2763.60 -0.11 574.76 -0.01
9 0.1503 -2764.19 0.17 574.89 0.09
10 0.1530 -2832.64 0.06 576.52 0.09
11 0.1530 -2833.80 -0.15 576.44 -0.01
12 0.1531 -2835.16 -0.05 576.66 0.16
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.
17QB220 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0