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: 17BA245 # Created Sun Apr 27 01:11:03 2025 # Orbit generated from Bernstein formalism # Fitting 18 observations of 18 # Arc: 2.02y # First observation: 2017/01/26 # Last observation: 2019/02/04 Preliminary a, adot, b, bdot, g, gdot: -0.000033 0.023006 -0.000000 -0.001794 0.023089 0.000000 # Chi-squared of fit: 9.42 DOF: 30 RMS: 0.13 # Min/Max residuals: -0.24 0.27 # Exact a, adot, b, bdot, g, gdot: 1.528054E-05 2.282188E-02 -2.314308E-06 -1.781819E-03 2.321473E-02 -6.220993E-03 # Covariance matrix: 1.5318E-13 -2.1481E-13 -8.1716E-16 3.6316E-15 9.5864E-14 -2.4915E-12 -2.1481E-13 2.3743E-12 1.1156E-14 -1.2595E-13 3.9391E-13 5.0398E-11 -8.1716E-16 1.1156E-14 1.1579E-13 -8.2400E-14 1.4595E-15 2.5525E-13 3.6316E-15 -1.2595E-13 -8.2400E-14 2.0255E-13 -3.9346E-14 -2.9932E-12 9.5864E-14 3.9391E-13 1.4595E-15 -3.9346E-14 5.6140E-13 1.1499E-11 -2.4915E-12 5.0398E-11 2.5525E-13 -2.9932E-12 1.1499E-11 1.1770E-09 # lat0 lon0 xBary yBary zBary JD0 -11.395949 153.143975 0.445927 -0.173603 -0.862162 2457780.059671 # Heliocentric elements and errors Epoch: 2457780.5000 = 2017/01/27 Mean Anomaly: 317.25870 +/- 0.065 Argument of Peri: 323.54773 +/- 0.098 Long of Asc Node: 264.87168 +/- 0.005 Inclination: 12.04712 +/- 0.000 Eccentricity: 0.31734503 +/- 0.0015 Semi-Major Axis: 52.76725634 +/- 0.0522 Time of Perihelion: 2474402.7718 +/- 5.3 Perihelion: 36.02182958 +/- 0.0880 Aphelion: 69.51268309 +/- 0.1058 Period (y) 383.3143 +/- 0.57 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -38.25921479 +/- 0.0012 Ecliptic Y 19.86641267 +/- 0.0006 Ecliptic Z -8.51143639 +/- 0.0003 Ecliptic XDOT -0.00053435 +/- 0.0000 Ecliptic YDOT -0.00275158 +/- 0.0000 Ecliptic ZDOT -0.00006109 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.94185269 +/- 0.0011 Geocenter to KBO 43.07609325 +/- 0.0014 # Hcoef: 7.86
The following table shows the complete astrometric record for 17BA245. 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 (17BA245) followed by the observatory code and reference code for the source of the astrometry.
2017 01 26.558870 10 03 58.52 -00 17 38.2 17BA245 T09 C~89UU 2017 01 26.612614 10 03 58.29 -00 17 37.9 17BA245 T09 C~89UU 2017 01 28.51088 10 03 50.55 -00 17 10.3 23.8z 17BA245 T09 C~89UU 2017 01 28.53366 10 03 50.45 -00 17 10.1 23.8z 17BA245 T09 C~89UU 2017 01 28.55243 10 03 50.39 -00 17 09.6 23.8z 17BA245 T09 C~89UU 2017 01 28.56591 10 03 50.33 -00 17 09.4 23.5z 17BA245 T09 C~89UU 2017 02 02.36824 10 03 30.22 -00 15 52.8 24.3r 17BA245 T09 C~89UU 2017 02 02.37761 10 03 30.17 -00 15 52.6 24.4r 17BA245 T09 C~89UU 2017 02 02.39961 10 03 30.08 -00 15 52.1 24.1r 17BA245 T09 C~89UU 2017 02 02.41283 10 03 30.04 -00 15 51.8 24.2r 17BA245 T09 C~89UU 2017 03 29.233920 09 59 44.36 +00 06 28.7 17BA245 T09 C~89UU 2017 03 29.251276 09 59 44.30 +00 06 29.0 17BA245 T09 C~89UU 2017 04 28.332402 09 58 39.57 +00 18 32.6 17BA245 T09 C~89UU 2018 01 17.53186 10 09 20.73 -00 53 13.5 24.4i 17BA245 T09 C~89UU 2018 01 17.56687 10 09 20.62 -00 53 13.4 24.4i 17BA245 T09 C~89UU 2018 01 17.59367 10 09 20.53 -00 53 13.0 24.6i 17BA245 T09 C~89UU 2018 12 13.640380 10 15 33.12 -01 26 12.9 17BA245 T09 C~89UU 2019 02 04.427442 10 13 01.07 -01 23 36.4 17BA245 T09 C~89UU
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 0.23
2 0.0001 -3.33 0.09 -0.94 -0.24
3 0.0053 -121.67 -0.03 -16.34 0.00
4 0.0054 -123.14 -0.04 -16.69 -0.15
5 0.0055 -124.16 0.14 -16.54 0.15
6 0.0055 -125.07 0.09 -16.67 0.13
7 0.0186 -434.27 -0.04 -52.11 -0.02
8 0.0187 -435.04 -0.19 -52.19 -0.04
9 0.0187 -436.48 -0.16 -52.20 0.11
10 0.0188 -437.15 0.06 -52.13 0.27
11 0.1689 -4078.25 -0.02 -0.32 -0.07
12 0.1689 -4079.20 -0.00 -0.36 -0.24
13 0.2513 -5244.35 0.03 331.66 -0.21
14 0.9746 5277.21 -0.24 -281.82 0.02
15 0.9747 5275.63 0.09 -282.32 -0.08
16 0.9748 5274.23 0.15 -282.42 0.12
17 1.8784 11210.77 0.02 -153.36 -0.01
18 2.0229 9017.89 -0.02 -815.40 0.03
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.
17BA245 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 52.239 52.362 52.119 ecceobj 0.310 0.314 0.306 incobj 12.023 12.023 12.023 qmin 35.181 34.998 34.896 qmax 70.337 70.881 70.943 amean 52.338 52.446 52.347 amin 51.675 51.709 51.699 amax 53.141 53.250 53.246 emean 0.311 0.316 0.313 emin 0.296 0.298 0.293 emax 0.328 0.333 0.334 imean 13.553 13.526 13.335 imin 12.897 12.640 12.481 imax 14.204 14.122 14.104 excite_mean 0.390 0.393 0.389 fracstop 1.000 1.000 1.000 cjmean 3.011 3.009 3.012 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 178.0 171.7 178.3 kozaiamp 180.0 180.0 180.0