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: 17BL231 # Created Wed Jul 17 01:11:27 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 27 observations of 27 # Arc: 11.16y # First observation: 2006/01/05 # Last observation: 2017/03/06 # Chi-squared of fit: 14.54 DOF: 48 RMS: 0.13 # Min/Max residuals: -0.40 0.22 # Exact a, adot, b, bdot, g, gdot: 1.493332E-05 2.096458E-02 6.018014E-06 8.701793E-03 2.230673E-02 -7.927333E-03 # Covariance matrix: 6.3938E-13 -2.9557E-13 8.5871E-14 -1.0538E-13 -2.7667E-13 -9.1278E-13 -2.9557E-13 3.2063E-13 -1.0617E-13 1.3027E-13 3.4726E-13 1.1283E-12 8.5871E-14 -1.0617E-13 4.6809E-13 -8.3422E-14 -1.1402E-13 -3.7887E-13 -1.0538E-13 1.3027E-13 -8.3422E-14 5.7747E-14 1.3869E-13 4.6509E-13 -2.7667E-13 3.4726E-13 -1.1402E-13 1.3869E-13 5.7721E-13 1.2000E-12 -9.1278E-13 1.1283E-12 -3.7887E-13 4.6509E-13 1.2000E-12 4.0285E-12 # lat0 lon0 xBary yBary zBary JD0 -20.073915 134.765062 0.493887 -0.292210 -0.800007 2453740.976286 # Heliocentric elements and errors Epoch: 2453740.5000 = 2006/01/05 Mean Anomaly: 335.65232 +/- 0.009 Argument of Peri: 22.73127 +/- 0.007 Long of Asc Node: 173.30979 +/- 0.000 Inclination: 29.54032 +/- 0.000 Eccentricity: 0.46958262 +/- 0.0001 Semi-Major Axis: 69.77820862 +/- 0.0176 Time of Perihelion: 2468139.5283 +/- 75.5 Perihelion: 37.01157481 +/- 0.0135 Aphelion: 102.54484242 +/- 0.0277 Period (y) 582.8918 +/- 0.22 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -29.90473067 +/- 0.0010 Ecliptic Y 30.84525088 +/- 0.0010 Ecliptic Z -15.38669161 +/- 0.0005 Ecliptic XDOT -0.00143879 +/- 0.0000 Ecliptic YDOT -0.00220685 +/- 0.0000 Ecliptic ZDOT 0.00133710 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 45.63437575 +/- 0.0010 Geocenter to KBO 44.82980822 +/- 0.0015 # Hcoef: 7.31
The following table shows the complete astrometric record for 17BL231. 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 (17BL231) followed by the observatory code and reference code for the source of the astrometry.
2006 01 05.475532 08 45 52.99 -02 50 44.1 17BL231 T14 C~81Bm 2006 01 05.536530 08 45 52.75 -02 50 43.7 17BL231 T14 C~81Bm 2008 01 05.436926 08 56 25.99 -02 33 29.3 17BL231 T14 C~81Bm 2008 01 05.470824 08 56 25.87 -02 33 29.1 17BL231 T14 C~81Bn 2016 04 04.244078 09 36 06.15 -00 33 03.2 17BL231 T09 C~81Bn 2016 04 04.276582 09 36 06.08 -00 33 01.8 17BL231 T09 C~81Bn 2016 12 25.44915 09 48 29.52 -01 05 55.1 23.8r 17BL231 T09 C~7xTm 2016 12 25.46448 09 48 29.50 -01 05 55.1 23.6r 17BL231 T09 C~7xTm 2016 12 25.48961 09 48 29.43 -01 05 55.0 23.8r 17BL231 T09 C~7xTm 2016 12 25.49171 09 48 29.42 -01 05 55.0 23.7r 17BL231 T09 C~7xTm 2017 01 26.45718 09 46 38.56 -00 59 13.1 23.3z 17BL231 T09 C~7xTm 2017 01 26.46663 09 46 38.52 -00 59 12.9 23.3z 17BL231 T09 C~7xTm 2017 01 26.47468 09 46 38.48 -00 59 13.1 23.0z 17BL231 T09 C~7xTm 2017 01 26.48271 09 46 38.46 -00 59 12.7 23.0z 17BL231 T09 C~7xTm 2017 01 26.49344 09 46 38.42 -00 59 12.4 23.2z 17BL231 T09 C~7xTm 2017 01 26.50952 09 46 38.33 -00 59 12.1 23.0z 17BL231 T09 C~7xTm 2017 01 28.42233 09 46 30.18 -00 58 29.4 24.6g 17BL231 T09 C~7xTm 2017 01 28.44025 09 46 30.10 -00 58 28.9 24.3g 17BL231 T09 C~7xTm 2017 01 28.45292 09 46 30.06 -00 58 28.9 24.3g 17BL231 T09 C~7xTm 2017 01 28.46760 09 46 29.98 -00 58 28.4 24.2g 17BL231 T09 C~7xTm 2017 03 04.39457 09 43 55.61 -00 41 00.7 23.2i 17BL231 T09 C~7xTm 2017 03 04.39993 09 43 55.60 -00 41 00.0 23.1i 17BL231 T09 C~7xTm 2017 03 04.43238 09 43 55.46 -00 40 59.2 23.0i 17BL231 T09 C~7xTm 2017 03 06.35845 09 43 47.47 -00 39 50.6 23.0i 17BL231 T09 C~7xTm 2017 03 06.39997 09 43 47.29 -00 39 49.3 23.0i 17BL231 T09 C~7xTm 2017 03 06.40280 09 43 47.28 -00 39 49.3 23.1i 17BL231 T09 C~7xTm 2017 03 06.41622 09 43 47.24 -00 39 48.5 23.1i 17BL231 T09 C~7xTm
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 -0.01 0.00 0.03
2 0.0002 0.00 0.01 0.00 -0.04
3 1.9985 0.00 -0.09 0.00 0.06
4 1.9986 0.00 0.07 0.00 0.01
5 10.2444 0.00 -0.03 0.00 -0.40
6 10.2445 0.00 0.09 0.00 -0.15
7 10.9705 0.00 -0.07 0.00 0.03
8 10.9705 0.00 0.21 0.00 -0.01
9 10.9706 0.00 0.11 0.00 0.02
10 10.9706 0.00 0.04 0.00 0.01
11 11.0581 0.00 -0.07 0.00 0.17
12 11.0582 0.00 -0.06 0.00 0.16
13 11.0582 0.00 -0.14 0.00 -0.21
14 11.0582 0.00 0.08 0.00 0.01
15 11.0582 0.00 0.18 0.00 0.08
16 11.0583 0.00 -0.13 0.00 0.03
17 11.0635 0.00 -0.03 0.00 0.09
18 11.0636 0.00 -0.06 0.00 0.18
19 11.0636 0.00 0.17 0.00 -0.10
20 11.0636 0.00 -0.06 0.00 0.06
21 11.1593 0.00 -0.16 0.00 -0.30
22 11.1593 0.00 0.03 0.00 0.21
23 11.1594 0.00 0.01 0.00 -0.14
24 11.1646 0.00 -0.06 0.00 0.18
25 11.1647 0.00 -0.15 0.00 -0.00
26 11.1648 0.00 -0.12 0.00 -0.10
27 11.1648 0.00 0.13 0.00 0.22
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.
17BL231 quality flag:3 Type: 7:2EEEEE 7:2EEEEE 7:2EEEEE axisobj 69.235 69.235 69.236 ecceobj 0.463 0.463 0.463 incobj 29.629 29.629 29.629 qmin 36.290 36.286 36.292 qmax 104.480 104.493 104.456 amean 69.408 69.408 69.408 amin 68.416 68.416 68.408 amax 70.786 70.785 70.786 emean 0.461 0.461 0.461 emin 0.445 0.445 0.445 emax 0.478 0.478 0.478 imean 29.313 29.311 29.313 imin 28.658 28.654 28.660 imax 29.760 29.758 29.761 excite_mean 0.672 0.672 0.672 fracstop 1.000 1.000 1.000 cjmean 2.784 2.784 2.784 libcent 0 178.2 178.4 178.7 libamp 0 147.4 147.6 147.8 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 100.4 100.4 100.3 kozaiamp 76.6 76.6 76.6