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: 17BG231 # Created Sun Dec 22 02:10:54 2024 # Orbit generated from Bernstein formalism # Fitting 23 observations of 23 # Arc: 0.97y # First observation: 2017/01/26 # Last observation: 2018/01/17 Preliminary a, adot, b, bdot, g, gdot: -0.000000 0.020294 -0.000002 -0.010592 0.023631 0.000000 # Chi-squared of fit: 17.90 DOF: 40 RMS: 0.16 # Min/Max residuals: -0.35 0.30 # Exact a, adot, b, bdot, g, gdot: 1.298081E-05 2.043272E-02 -6.306747E-06 -1.065332E-02 2.362974E-02 4.390739E-03 # Covariance matrix: 1.2064E-13 4.7028E-13 9.7657E-15 -2.8916E-13 3.4034E-13 2.7808E-11 4.7028E-13 2.0451E-10 2.8053E-12 -9.4022E-11 5.2524E-11 9.1782E-09 9.7657E-15 2.8053E-12 1.2151E-13 -1.3915E-12 7.3275E-13 1.2633E-10 -2.8916E-13 -9.4022E-11 -1.3915E-12 4.3852E-11 -2.4355E-11 -4.2316E-09 3.4034E-13 5.2524E-11 7.3275E-13 -2.4355E-11 1.4564E-11 2.3752E-09 2.7808E-11 9.1782E-09 1.2633E-10 -4.2316E-09 2.3752E-09 4.1305E-07 # lat0 lon0 xBary yBary zBary JD0 -12.483662 151.500258 0.420851 -0.192589 -0.870695 2457780.038741 # Heliocentric elements and errors Epoch: 2457780.5000 = 2017/01/27 Mean Anomaly: 55.04799 +/- 1.113 Argument of Peri: 129.57654 +/- 1.739 Long of Asc Node: 308.91000 +/- 0.003 Inclination: 30.02063 +/- 0.003 Eccentricity: 0.19186770 +/- 0.0287 Semi-Major Axis: 47.00340644 +/- 0.5993 Time of Perihelion: 2439782.2039 +/- 117.8 Perihelion: 37.98497074 +/- 1.4318 Aphelion: 56.02184214 +/- 1.5250 Period (y) 322.2569 +/- 6.16 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -36.89834850 +/- 0.0059 Ecliptic Y 20.50630326 +/- 0.0032 Ecliptic Z -9.14812725 +/- 0.0015 Ecliptic XDOT -0.00132880 +/- 0.0001 Ecliptic YDOT -0.00197755 +/- 0.0000 Ecliptic ZDOT -0.00131519 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.19357391 +/- 0.0052 Geocenter to KBO 42.31955684 +/- 0.0068 # Hcoef: 8.02
The following table shows the complete astrometric record for 17BG231. 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 (17BG231) followed by the observatory code and reference code for the source of the astrometry.
2017 01 26.53794 09 56 25.33 -00 44 43.6 23.8z 17BG231 T09 C~7xTl 2017 01 26.54133 09 56 25.33 -00 44 43.4 24.2z 17BG231 T09 C~7xTl 2017 01 26.55080 09 56 25.26 -00 44 43.1 23.9z 17BG231 T09 C~7xTl 2017 01 26.56693 09 56 25.19 -00 44 43.1 23.9z 17BG231 T09 C~7xTl 2017 01 26.58033 09 56 25.13 -00 44 42.9 24.2z 17BG231 T09 C~7xTl 2017 01 26.58570 09 56 25.11 -00 44 42.9 24.7z 17BG231 T09 C~7xTl 2017 01 26.59646 09 56 25.07 -00 44 43.1 24.2z 17BG231 T09 C~7xTl 2017 01 26.59916 09 56 25.07 -00 44 42.7 24.6z 17BG231 T09 C~7xTl 2017 01 26.60996 09 56 24.98 -00 44 42.6 24.1z 17BG231 T09 C~7xTl 2017 02 02.37330 09 55 54.48 -00 43 24.9 24.4r 17BG231 T09 C~7xTl 2017 02 02.37546 09 55 54.48 -00 43 25.1 24.3r 17BG231 T09 C~7xTl 2017 02 02.39743 09 55 54.38 -00 43 24.4 24.1r 17BG231 T09 C~7xTl 2017 02 02.41063 09 55 54.31 -00 43 24.2 24.1r 17BG231 T09 C~7xTl 2017 02 02.42609 09 55 54.23 -00 43 24.2 24.4r 17BG231 T09 C~7xTl 2017 03 06.37764 09 53 25.15 -00 33 22.4 23.8i 17BG231 T09 C~7xTl 2017 03 06.44451 09 53 24.85 -00 33 21.3 24.2i 17BG231 T09 C~7xTl 2017 03 06.44718 09 53 24.82 -00 33 20.6 24.1i 17BG231 T09 C~7xTl 2017 03 06.45254 09 53 24.81 -00 33 20.6 23.9i 17BG231 T09 C~7xTl 2017 03 06.46600 09 53 24.73 -00 33 20.2 23.9i 17BG231 T09 C~7xTl 2018 01 17.46995 10 00 35.71 -01 44 27.2 23.8i 17BG231 T09 C~7xTl 2018 01 17.52652 10 00 35.48 -01 44 27.0 24.5i 17BG231 T09 C~7xTl 2018 01 17.55341 10 00 35.38 -01 44 27.0 24.6i 17BG231 T09 C~7xTl 2018 01 17.57759 10 00 35.26 -01 44 26.9 24.5i 17BG231 T09 C~7xTl
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 0.14 0.00 -0.17
2 0.0000 -0.07 0.30 0.19 0.07
3 0.0000 -1.16 -0.16 0.10 0.12
4 0.0001 -2.14 -0.07 -0.27 -0.02
5 0.0001 -3.06 -0.09 -0.39 0.04
6 0.0001 -3.34 -0.02 -0.50 0.02
7 0.0002 -3.83 0.20 -0.89 -0.23
8 0.0002 -3.97 0.24 -0.52 0.18
9 0.0002 -5.27 -0.34 -0.90 -0.04
10 0.0187 -461.03 -0.10 -88.04 -0.06
11 0.0187 -460.96 0.12 -88.23 -0.22
12 0.0188 -462.61 0.01 -88.09 0.18
13 0.0188 -463.66 -0.12 -88.27 0.16
14 0.0189 -464.78 -0.15 -88.69 -0.07
15 0.1063 -2770.28 0.11 -306.83 0.04
16 0.1065 -2774.88 0.29 -307.38 -0.35
17 0.1065 -2775.55 -0.18 -306.88 0.15
18 0.1065 -2775.69 0.06 -306.93 0.11
19 0.1066 -2776.96 -0.24 -306.98 0.09
20 0.9745 4771.33 -0.00 -2046.03 0.09
21 0.9746 4768.03 -0.01 -2047.05 0.05
22 0.9747 4766.62 0.16 -2047.57 -0.01
23 0.9748 4764.90 -0.15 -2048.11 -0.13
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.
17BG231 quality flag:2 Type: SCATEXTD SCATNEAR SCATEXTD axisobj 46.889 49.103 45.373 ecceobj 0.196 0.272 0.119 incobj 30.043 30.034 30.051 qmin 36.860 34.807 39.325 qmax 57.223 63.937 51.723 amean 46.855 49.020 45.373 amin 46.461 48.539 45.015 amax 47.312 49.598 45.759 emean 0.193 0.268 0.116 emin 0.176 0.249 0.103 emax 0.211 0.289 0.131 imean 31.456 31.465 31.485 imin 31.137 31.080 31.189 imax 31.862 32.017 31.771 excite_mean 0.556 0.587 0.535 fracstop 1.000 1.000 1.000 cjmean 2.731 2.711 2.743 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 186.3 196.0 182.5 kozaiamp 180.0 180.0 180.0