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: 17BC241 # Created Tue Apr 1 01:11:02 2025 # Orbit generated from Bernstein formalism # Fitting 19 observations of 19 # Arc: 1.95y # First observation: 2015/03/22 # Last observation: 2017/03/04 Preliminary a, adot, b, bdot, g, gdot: -0.000150 0.036035 0.000011 -0.000098 0.027541 0.000000 # Chi-squared of fit: 8.74 DOF: 32 RMS: 0.12 # Min/Max residuals: -0.22 0.28 # Exact a, adot, b, bdot, g, gdot: 2.013657E-05 3.576113E-02 -1.700305E-07 -7.542263E-05 2.834116E-02 4.237102E-03 # Covariance matrix: 7.3171E-13 -1.0790E-12 5.3267E-17 3.1664E-15 -4.2092E-13 -9.7830E-12 -1.0790E-12 8.0432E-12 -1.3940E-15 -3.3628E-14 4.6712E-12 1.0749E-10 5.3267E-17 -1.3940E-15 6.6677E-13 -3.6578E-13 -1.6230E-14 -9.9671E-14 3.1664E-15 -3.3628E-14 -3.6578E-13 2.2740E-13 8.3767E-17 -3.5694E-13 -4.2092E-13 4.6712E-12 -1.6230E-14 8.3767E-17 3.9282E-12 7.0181E-11 -9.7830E-12 1.0749E-10 -9.9671E-14 -3.5694E-13 7.0181E-11 1.5093E-09 # lat0 lon0 xBary yBary zBary JD0 -13.148054 141.021402 -0.641645 -0.172339 -0.738350 2457103.901035 # Heliocentric elements and errors Epoch: 2457100.5000 = 2015/03/19 Mean Anomaly: 7.09102 +/- 0.047 Argument of Peri: 246.73064 +/- 0.172 Long of Asc Node: 231.72091 +/- 0.004 Inclination: 12.87091 +/- 0.000 Eccentricity: 0.49350681 +/- 0.0005 Semi-Major Axis: 69.17119521 +/- 0.0447 Time of Perihelion: 2452961.5272 +/- 27.4 Perihelion: 35.03473931 +/- 0.0441 Aphelion: 103.30765110 +/- 0.0767 Period (y) 575.3023 +/- 0.56 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -27.70696030 +/- 0.0019 Ecliptic Y 21.59108900 +/- 0.0015 Ecliptic Z -8.02606109 +/- 0.0006 Ecliptic XDOT -0.00248503 +/- 0.0000 Ecliptic YDOT -0.00244169 +/- 0.0000 Ecliptic ZDOT -0.00010011 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 36.03149220 +/- 0.0017 Geocenter to KBO 35.28437597 +/- 0.0025 # Hcoef: 8.81
The following table shows the complete astrometric record for 17BC241. 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 (17BC241) followed by the observatory code and reference code for the source of the astrometry.
2015 03 22.400257 09 16 57.90 +02 00 11.8 17BC241 T09 C~86ul 2015 03 22.453542 09 16 57.72 +02 00 13.4 17BC241 T09 C~86ul 2016 04 04.268116 09 24 03.98 +01 29 04.4 17BC241 T09 C~86ul 2016 11 28.622398 09 39 40.55 +00 19 41.7 17BC241 T09 C~86ul 2016 12 25.483314 09 38 54.57 +00 14 15.1 17BC241 T09 C~86ul 2017 01 21.36859 09 37 08.23 +00 16 58.6 24.5z 17BC241 T09 C~86ul 2017 01 21.37198 09 37 08.22 +00 16 59.0 23.9z 17BC241 T09 C~86ul 2017 01 21.38540 09 37 08.15 +00 16 58.8 24.7z 17BC241 T09 C~86ul 2017 01 21.39346 09 37 08.10 +00 16 59.5 24.7z 17BC241 T09 C~86ul 2017 01 21.40419 09 37 08.04 +00 16 59.3 24.3z 17BC241 T09 C~86ul 2017 01 21.41223 09 37 08.01 +00 16 59.5 24.1z 17BC241 T09 C~86ul 2017 02 01.47870 09 36 13.55 +00 20 18.6 23.9i 17BC241 T09 C~86ul 2017 02 01.51446 09 36 13.36 +00 20 19.6 23.9i 17BC241 T09 C~86ul 2017 02 01.51997 09 36 13.34 +00 20 19.4 23.9i 17BC241 T09 C~86ul 2017 02 01.55545 09 36 13.15 +00 20 20.1 24.1i 17BC241 T09 C~86ul 2017 02 01.62394 09 36 12.80 +00 20 21.7 24.3i 17BC241 T09 C~86ul 2017 02 01.62661 09 36 12.79 +00 20 21.7 23.9i 17BC241 T09 C~86ul 2017 03 04.385780 09 33 38.33 +00 34 22.5 17BC241 T09 C~86ul 2017 03 04.388470 09 33 38.32 +00 34 22.6 17BC241 T09 C~86ul
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 -0.04 0.00 0.03
2 0.0001 -3.06 0.04 0.69 -0.04
3 1.0373 6654.74 -0.01 204.20 0.03
4 1.6899 21373.11 -0.02 617.44 -0.06
5 1.7634 20813.50 0.11 89.60 -0.06
6 1.8370 19231.96 0.18 -252.88 -0.18
7 1.8370 19231.69 0.16 -252.55 0.19
8 1.8371 19230.74 0.21 -253.07 -0.22
9 1.8371 19229.80 -0.14 -252.63 0.28
10 1.8371 19229.00 -0.14 -253.10 -0.10
11 1.8371 19228.51 -0.04 -253.05 0.02
12 1.8674 18383.25 -0.05 -318.15 0.04
13 1.8675 18380.21 -0.21 -318.09 0.25
14 1.8675 18379.98 0.01 -318.37 -0.01
15 1.8676 18377.03 -0.08 -318.60 -0.09
16 1.8678 18371.50 -0.10 -318.71 0.07
17 1.8678 18371.36 -0.03 -318.76 0.03
18 1.9520 15890.91 0.06 -239.80 -0.11
19 1.9521 15890.73 0.09 -239.75 -0.08
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.
17BC241 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 68.660 68.840 68.484 ecceobj 0.490 0.492 0.488 incobj 12.856 12.856 12.856 qmin 33.987 34.037 33.721 qmax 104.218 105.051 104.648 amean 67.907 68.560 68.057 amin 66.690 67.512 66.987 amax 69.427 70.023 69.497 emean 0.483 0.488 0.488 emin 0.464 0.473 0.475 emax 0.501 0.504 0.506 imean 13.786 14.102 13.225 imin 12.845 13.181 11.917 imax 14.804 15.004 14.089 excite_mean 0.539 0.545 0.539 fracstop 1.000 1.000 1.000 cjmean 2.997 2.994 2.996 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 186.1 179.5 207.3 kozaiamp 180.0 180.0 180.0