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: 17BU263 # Created Sun Oct 19 01:11:42 2025 # Orbit generated from Bernstein formalism # Fitting 16 observations of 16 # Arc: 44.11d # First observation: 2017/01/21 # Last observation: 2017/03/06 Preliminary a, adot, b, bdot, g, gdot: 0.000001 0.029998 0.000003 -0.002472 0.023501 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 58.11 DOF: 27 RMS: 0.34 # Min/Max residuals: -1.47 0.44 # Exact a, adot, b, bdot, g, gdot: 1.851757E-05 2.781537E-02 -3.223946E-07 -2.511686E-03 2.306131E-02 -1.430690E-02 # Covariance matrix: 2.4798E-13 1.0665E-10 6.9525E-14 2.2105E-12 2.0473E-11 1.2802E-09 1.0665E-10 2.6532E-07 1.4868E-10 6.2965E-09 4.5804E-08 1.2023E-06 6.9525E-14 1.4868E-10 2.1570E-13 2.1312E-12 2.5897E-11 7.7158E-10 2.2105E-12 6.2965E-09 2.1312E-12 1.9736E-10 1.0783E-09 2.4701E-08 2.0473E-11 4.5804E-08 2.5897E-11 1.0783E-09 7.9544E-09 2.2743E-07 1.2802E-09 1.2023E-06 7.7158E-10 2.4701E-08 2.2743E-07 1.4043E-05 # lat0 lon0 xBary yBary zBary JD0 -10.178852 152.127987 0.509180 -0.149017 -0.831027 2457774.918621 # Heliocentric elements and errors Epoch: 2457770.5000 = 2017/01/17 Mean Anomaly: 348.82681 +/- 108.863 Argument of Peri: 296.56541 +/- 7.910 Long of Asc Node: 269.23573 +/- 0.502 Inclination: 11.25294 +/- 0.051 Eccentricity: 1.06339196 +/- 0.1577 Semi-Major Axis: -549.70944531 +/- 1416.3651 Time of Perihelion: 2460967.0081 +/- 9999999.9 Perihelion: 34.84716183 +/- 124.7962 Aphelion: ************* +/- 2923.8013 Period (y) 281.9752 +/- 13931.85 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -38.24102884 +/- 0.1459 Ecliptic Y 20.79293005 +/- 0.0772 Ecliptic Z -7.66316157 +/- 0.0296 Ecliptic XDOT -0.00001655 +/- 0.0004 Ecliptic YDOT -0.00373207 +/- 0.0002 Ecliptic ZDOT 0.00000661 +/- 0.0001 # Distances at JD0 (AU) Heliocenter to KBO 44.19780845 +/- 0.1315 Geocenter to KBO 43.36266938 +/- 0.1677 # Hcoef: NaN
The following table shows the complete astrometric record for 17BU263. 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 (17BU263) followed by the observatory code and reference code for the source of the astrometry.
2017 01 21.41782 10 01 57.63 +01 11 50.1 25.5z 17BU263 T09 C~94uD 2017 01 21.44099 10 01 57.57 +01 11 50.5 25.4z 17BU263 T09 C~94uD 2017 01 21.57598 10 01 56.94 +01 11 52.5 25.7z 17BU263 T09 C~94uD 2017 01 23.41024 10 01 50.24 +01 12 13.5 26.4r 17BU263 T09 C~94uD 2017 01 23.41467 10 01 50.22 +01 12 13.5 25.8r 17BU263 T09 C~94uD 2017 01 23.48534 10 01 49.93 +01 12 14.5 25.6i 17BU263 T09 C~94uD 2017 01 23.52068 10 01 49.83 +01 12 14.6 25.8i 17BU263 T09 C~94uD 2017 01 23.52648 10 01 49.80 +01 12 14.5 25.6i 17BU263 T09 C~94uD 2017 01 23.56169 10 01 49.66 +01 12 15.1 25.9i 17BU263 T09 C~94uD 2017 01 23.59193 10 01 49.53 +01 12 15.6 25.5i 17BU263 T09 C~94uD 2017 01 30.53141 10 01 22.55 +01 13 50.1 25.5z 17BU263 T09 C~94uD 2017 01 30.56834 10 01 22.40 +01 13 50.9 24.8z 17BU263 T09 C~94uD 2017 01 30.61597 10 01 22.17 +01 13 51.6 24.8z 17BU263 T09 C~94uD 2017 03 06.50449 09 58 56.64 +01 25 55.5 25.9r 17BU263 T09 C~94uD 2017 03 06.51829 09 58 56.56 +01 25 55.7 25.9r 17BU263 T09 C~94uD 2017 03 06.53219 09 58 56.51 +01 25 55.8 26.0r 17BU263 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 0.11 0.00 -0.29
2 0.0001 -0.98 0.44 0.06 -0.01
3 0.0004 -10.53 -1.47 -1.39 -0.19
4 0.0055 -111.98 0.12 -17.07 0.18
5 0.0055 -112.26 0.10 -17.18 0.11
6 0.0057 -116.68 -0.22 -17.77 0.15
7 0.0058 -118.12 0.39 -18.21 0.03
8 0.0058 -118.50 0.34 -18.46 -0.17
9 0.0059 -120.68 0.21 -18.63 -0.03
10 0.0060 -122.68 -0.03 -18.85 0.03
11 0.0250 -534.68 0.23 -72.68 0.00
12 0.0251 -537.07 0.16 -72.72 0.23
13 0.0252 -540.54 -0.34 -73.28 0.02
14 0.1207 -2838.26 0.12 -162.79 0.21
15 0.1207 -2839.46 -0.17 -163.03 -0.04
16 0.1208 -2840.19 0.00 -163.20 -0.23
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.
17BU263 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 43.313 43.313 43.313 ecceobj 0.107 0.107 0.107 incobj 13.084 13.084 13.084 qmin 38.106 38.120 38.105 qmax 48.868 48.896 48.865 amean 43.346 43.346 43.346 amin 42.989 43.005 43.005 amax 43.722 43.723 43.727 emean 0.104 0.104 0.104 emin 0.090 0.091 0.090 emax 0.119 0.118 0.118 imean 14.895 14.897 14.905 imin 14.251 14.250 14.253 imax 15.348 15.354 15.355 excite_mean 0.277 0.277 0.277 fracstop 1.000 1.000 1.000 cjmean 3.000 3.000 3.000 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 183.1 183.6 182.7 kozaiamp 180.0 180.0 180.0