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: 91554 # Created Thu May 24 01:36:39 2012 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 23 observations of 25 # Arc: 6.76y # First observation: 1999/09/08 # Last observation: 2006/06/11 # Chi-squared of fit: 39.79 DOF: 40 RMS: 0.23 # Min/Max residuals: -0.45 0.51 # Exact a, adot, b, bdot, g, gdot: 2.221908E-05 4.479092E-02 1.073952E-05 1.970509E-02 3.326194E-02 1.825101E-04 # Covariance matrix: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 # lat0 lon0 xBary yBary zBary JD0 -9.527289 -39.070484 -0.408321 -0.151450 -0.900945 2451429.813113 # Heliocentric elements and errors Epoch: 2451430.5000 = 1999/09/09 Mean Anomaly: 0.27858 +/- 0.000 Argument of Peri: 335.84725 +/- 0.000 Long of Asc Node: 341.69180 +/- 0.000 Inclination: 25.46642 +/- 0.000 Eccentricity: 0.70074863 +/- 0.0000 Semi-Major Axis: 103.47061764 +/- 0.0000 Time of Perihelion: 2451133.0063 +/- 0.0 Perihelion: 30.96372386 +/- 0.0000 Aphelion: 175.97751143 +/- 0.0000 Period (y) 1052.5283 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 23.99397055 +/- 0.0000 Ecliptic Y -18.94393144 +/- 0.0000 Ecliptic Z -4.97583631 +/- 0.0000 Ecliptic XDOT 0.00253955 +/- 0.0000 Ecliptic YDOT 0.00269212 +/- 0.0000 Ecliptic ZDOT 0.00159717 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 30.97323717 +/- 0.0000 Geocenter to KBO 30.06442651 +/- 0.0000 # Hcoef: 7.76
The following table shows the complete astrometric record for 91554. 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 (91554) followed by the observatory code and reference code for the source of the astrometry.
1999 09 08.31237 21 46 29.13 -23 31 21.3 22.5R 91554 568 Ca9937 1999 09 08.36468 21 46 28.81 -23 31 21.9 22.4R 91554 568 Ca9937 1999 09 08.42001 21 46 28.47 -23 31 21.8 22.4R 91554 568 Ca9937 1999 09 10.32683 21 46 17.18 -23 31 37.6 22.4R 91554 568 Ca9937 1999 09 10.34707 21 46 17.04 -23 31 37.8 22.4R 91554 568 Ca9937 1999 10 08.23745 21 44 02.43 -23 31 00.7 22.4R 91554 568 Ca9937 1999 10 08.24916 21 44 02.40 -23 31 00.5 22.7R 91554 568 Ca9937 1999 11 10.24441 21 43 13.50 -23 18 29.1 22.7R 91554 568 Ca9937 1999 11 11.29588 21 43 14.31 -23 17 53.0 22.2R 91554 568 Ca9937 1999 11 13.29373 21 43 16.25 -23 16 42.0 22.6R 91554 568 Ca9937 2000 05 30.57977 22 02 47.32 -21 03 43.8 22.6R 91554 568 Cb6506 2000 05 31.59053 22 02 47.25 -21 03 49.8 22.7R 91554 568 Cb6506 2000 06 01.57429 22 02 47.04 -21 03 56.4 22.6R 91554 568 Cb6506 2001 07 23.39894 22 08 27.086 -19 20 46.82 91554 568 Cl5551 2001 07 23.46769 22 08 26.708 -19 20 48.60 91554 568 Cl5551 2002 11 05.26734 22 08 11.66 -17 38 35.3 22.5R 91554 568 Cl9133 2002 11 06.28959 22 08 10.86 -17 38 15.3 91554 568 Cl9133 2004 08 23.14103 22 29 18.66 -13 34 35.4 21.9R 91554 304 Cl4067 2004 08 23.27769 22 29 17.81 -13 34 38.6 91554 304 Cl4067 2006 06 11.34509 22 48 29.65 -09 23 35.7 21.9R 91554 250 S~06GZ 2006 06 11.40707 22 48 29.65 -09 23 35.1 91554 250 S~06GZ 2006 06 11.41146 22 48 29.65 -09 23 35.1 91554 250 S~06GZ 2006 06 11.41586 22 48 29.65 -09 23 35.0 91554 250 S~06GZ 2006 06 21.32949 22 48 24.833 -09 22 44.83 22.5R 91554 304 2006 06 21.37248 22 48 24.812 -09 22 45.24 91554 304
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 0.09 2 0.0001 0.00 -0.02 0.00 -0.45 3 0.0003 0.00 -0.04 0.00 0.14 4 0.0055 0.00 0.51 0.00 0.25 5 0.0056 0.00 0.24 0.00 0.21 6 0.0819 0.00 0.10 0.00 0.20 7 0.0820 0.00 0.29 0.00 0.27 8 0.1723 0.00 -0.23 0.00 -0.11 9 0.1752 0.00 -0.05 0.00 -0.32 10 0.1806 0.00 -0.10 0.00 -0.22 11 0.7263 0.00 0.17 0.00 0.12 12 0.7290 0.00 0.25 0.00 0.13 13 0.7317 0.00 0.04 0.00 -0.05 14 1.8729 0.00 -0.38 0.00 -0.07 15 1.8731 0.00 -0.43 0.00 -0.22 16 3.1594 0.00 -0.04 0.00 0.22 17 3.1622 0.00 -0.07 0.00 0.00 18 4.9578 0.00 0.14 0.00 0.42 19 4.9582 0.00 0.06 0.00 0.38 20 6.7571 0.00 0.36 0.00 -0.19 21 6.7573 0.00 0.32 0.00 -0.13 22 6.7573 0.00 0.32 0.00 -0.17 23 6.7573 0.00 0.32 0.00 -0.11 24 6.7844 0.00 ( 6.11) 0.00 ( -3.67) 25 6.7846 0.00 ( 6.56) 0.00 ( -4.16)
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.
91554 quality flag:2 Type: CENTAURS CENTAURR CENTAURS axisobj 103.063 103.063 103.063 ecceobj 0.700 0.700 0.700 incobj 25.474 25.474 25.474 qmin 29.672 29.084 29.141 qmax 192.648 188.902 188.189 amean 107.000 97.790 97.933 amin 98.433 91.079 88.715 amax 111.733 110.053 110.005 emean 0.714 0.692 0.685 emin 0.683 0.668 0.649 emax 0.728 0.716 0.711 imean 25.465 24.991 26.290 imin 24.069 23.388 23.941 imax 27.696 27.164 28.013 excite_mean 0.834 0.811 0.816 fracstop 1.000 0.831 1.000 cjmean 2.662 2.664 2.660 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 112.5 117.7 138.2 kozaiamp 179.9 180.0 180.0