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: 17BW263 # Created Sun Oct 19 01:11:42 2025 # Orbit generated from Bernstein formalism # Fitting 21 observations of 21 # Arc: 62.82d # First observation: 2017/01/21 # Last observation: 2017/03/25 Preliminary a, adot, b, bdot, g, gdot: -0.000005 0.029337 0.000005 -0.005116 0.024948 0.000000 # Chi-squared of fit: 99.78 DOF: 36 RMS: 0.39 # Min/Max residuals: -1.66 0.84 # Exact a, adot, b, bdot, g, gdot: 1.633303E-05 2.337255E-02 -2.546189E-06 -5.138832E-03 2.395822E-02 2.095729E-03 # Covariance matrix: 1.3832E-13 -4.4892E-12 1.8736E-17 -1.4517E-13 -1.1218E-13 1.5198E-10 -4.4892E-12 4.2839E-08 2.7613E-11 2.7880E-10 6.7479E-09 -8.9661E-08 1.8736E-17 2.7613E-11 1.3191E-13 -6.9410E-13 4.3961E-12 -4.3713E-11 -1.4517E-13 2.7880E-10 -6.9410E-13 1.9302E-11 4.1619E-11 -1.3109E-09 -1.1218E-13 6.7479E-09 4.3961E-12 4.1619E-11 1.0721E-09 -1.1381E-08 1.5198E-10 -8.9661E-08 -4.3713E-11 -1.3109E-09 -1.1381E-08 1.0514E-06 # lat0 lon0 xBary yBary zBary JD0 -8.379843 151.905637 0.504977 -0.123226 -0.837789 2457774.979281 # Heliocentric elements and errors Epoch: 2457770.5000 = 2017/01/17 Mean Anomaly: 35.49339 +/- 14.047 Argument of Peri: 169.65485 +/- 19.077 Long of Asc Node: 298.42299 +/- 0.237 Inclination: 14.91817 +/- 0.092 Eccentricity: 0.11397684 +/- 0.0298 Semi-Major Axis: 46.67577597 +/- 0.5823 Time of Perihelion: 2446286.8289 +/- 4539.8 Perihelion: 41.35581850 +/- 1.4854 Aphelion: 51.99573344 +/- 1.5365 Period (y) 318.8934 +/- 5.97 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -36.94106393 +/- 0.0498 Ecliptic Y 20.28582142 +/- 0.0266 Ecliptic Z -6.08301676 +/- 0.0083 Ecliptic XDOT -0.00138852 +/- 0.0001 Ecliptic YDOT -0.00229164 +/- 0.0001 Ecliptic ZDOT -0.00061594 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.58121474 +/- 0.0450 Geocenter to KBO 41.73933652 +/- 0.0570 # Hcoef: 9.37
The following table shows the complete astrometric record for 17BW263. 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 (17BW263) followed by the observatory code and reference code for the source of the astrometry.
2017 01 21.47848 10 03 40.17 +02 57 30.9 25.4z 17BW263 T09 C~94uD 2017 01 21.50455 10 03 40.09 +02 57 31.1 26.0z 17BW263 T09 C~94uD 2017 01 21.53071 10 03 39.98 +02 57 31.8 25.5z 17BW263 T09 C~94uD 2017 01 21.55293 10 03 39.88 +02 57 31.9 25.1z 17BW263 T09 C~94uD 2017 01 23.35766 10 03 32.53 +02 57 55.3 25.6r 17BW263 T09 C~94uD 2017 01 23.39135 10 03 32.44 +02 57 56.5 26.1r 17BW263 T09 C~94uD 2017 01 23.40520 10 03 32.35 +02 57 56.2 25.5r 17BW263 T09 C~94uD 2017 01 23.41887 10 03 32.32 +02 57 56.4 25.7r 17BW263 T09 C~94uD 2017 01 23.45863 10 03 32.12 +02 57 56.9 25.5r 17BW263 T09 C~94uD 2017 01 23.55452 10 03 31.71 +02 57 58.0 26.5i 17BW263 T09 C~94uD 2017 01 23.58486 10 03 31.60 +02 57 58.5 25.7i 17BW263 T09 C~94uD 2017 01 30.40987 10 03 02.60 +02 59 40.9 25.4i 17BW263 T09 C~94uD 2017 01 30.45397 10 03 02.38 +02 59 41.9 25.7i 17BW263 T09 C~94uD 2017 01 30.60892 10 03 01.61 +02 59 45.9 25.2z 17BW263 T09 C~94uD 2017 03 04.26345 10 00 32.69 +03 11 18.3 25.4z 17BW263 T09 C~94uD 2017 03 04.28899 10 00 32.53 +03 11 19.1 24.8z 17BW263 T09 C~94uD 2017 03 04.31098 10 00 32.42 +03 11 20.1 24.7z 17BW263 T09 C~94uD 2017 03 04.33650 10 00 32.31 +03 11 20.6 24.5z 17BW263 T09 C~94uD 2017 03 25.26876 09 59 07.45 +03 19 53.3 25.6r 17BW263 T09 C~94uD 2017 03 25.28248 09 59 07.37 +03 19 53.4 25.9r 17BW263 T09 C~94uD 2017 03 25.29622 09 59 07.33 +03 19 53.9 25.8r 17BW263 T09 C~94uD
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 -0.19 0.00 -0.17
2 0.0001 -1.19 0.24 -0.23 -0.15
3 0.0001 -2.98 0.08 -0.16 0.18
4 0.0002 -4.42 0.02 -0.59 -0.04
5 0.0051 -115.72 -0.11 -17.37 -0.32
6 0.0052 -117.41 0.33 -16.72 0.64
7 0.0053 -118.56 0.05 -17.47 0.02
8 0.0053 -119.05 0.43 -17.44 0.17
9 0.0054 -122.04 -0.03 -18.03 -0.04
10 0.0057 -128.17 -0.06 -19.16 -0.26
11 0.0058 -129.89 0.15 -19.27 -0.09
12 0.0245 -572.59 0.40 -76.00 -0.23
13 0.0246 -576.03 -0.03 -76.22 -0.10
14 0.0250 -588.23 -1.66 -76.53 0.84
15 0.1144 -2920.09 0.80 -211.04 -0.39
16 0.1145 -2922.62 0.11 -211.13 -0.46
17 0.1145 -2924.51 -0.21 -210.77 -0.09
18 0.1146 -2926.23 -0.09 -210.88 -0.17
19 0.1719 -4296.58 0.12 -176.18 0.40
20 0.1719 -4297.73 -0.22 -176.50 0.03
21 0.1720 -4298.47 -0.14 -176.25 0.24
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.
17BW263 quality flag:2 Type: SCATEXTD SCATNEAR SCATEXTD axisobj 46.497 48.650 44.681 ecceobj 0.114 0.192 0.075 incobj 14.914 14.796 15.162 qmin 40.465 38.403 40.651 qmax 52.859 59.302 48.943 amean 46.498 48.616 44.690 amin 46.117 48.159 44.338 amax 46.916 49.131 45.062 emean 0.115 0.193 0.075 emin 0.103 0.180 0.063 emax 0.127 0.207 0.086 imean 16.413 16.230 16.674 imin 16.061 15.867 16.332 imax 16.666 16.630 17.038 excite_mean 0.305 0.340 0.296 fracstop 1.000 1.000 1.000 cjmean 3.015 3.013 3.001 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 187.6 179.8 181.8 kozaiamp 179.9 180.0 180.0