The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory.
# Object: 69987 # Created Fri May 2 02:36:18 2008 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 15 observations of 15 # Arc: 4.92y # First observation: 1998/11/19 # Last observation: 2003/10/22 # Chi-squared of fit: 32.90 DOF: 24 RMS: 0.26 # Min/Max residuals: -0.64 0.45 # Exact a, adot, b, bdot, g, gdot: 1.519267E-05 2.376870E-02 -3.261784E-07 2.359319E-05 2.436764E-02 3.648239E-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 -1.070339 49.419552 -0.131946 -0.018457 -0.975346 2451136.726261 # Heliocentric elements and errors Epoch: 2451135.5000 = 1998/11/18 Mean Anomaly: 48.05228 +/- 0.000 Argument of Peri: 222.91900 +/- 0.000 Long of Asc Node: 136.22795 +/- 0.000 Inclination: 1.04716 +/- 0.000 Eccentricity: 0.02737274 +/- 0.0000 Semi-Major Axis: 42.78302282 +/- 0.0000 Time of Perihelion: 2437492.2719 +/- 0.0 Perihelion: 41.61193427 +/- 0.0000 Aphelion: 43.95411138 +/- 0.0000 Period (y) 279.8436 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 27.23348603 +/- 0.0000 Ecliptic Y 31.98912222 +/- 0.0000 Ecliptic Z -0.76658454 +/- 0.0000 Ecliptic XDOT -0.00200218 +/- 0.0000 Ecliptic YDOT 0.00177751 +/- 0.0000 Ecliptic ZDOT 0.00000186 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.01848702 +/- 0.0000 Geocenter to KBO 41.03805591 +/- 0.0000 # Hcoef: 7.14
The following table shows the complete astrometric record for 69987. 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 (69987) followed by the observatory code and reference code for the source of the astrometry.
1998 11 19.22553 03 09 05.16 +16 33 14.2 22.8R 69987 695 Ca3208 1998 11 19.29635 03 09 04.79 +16 33 12.8 69987 695 Ca3208 1998 11 19.36883 03 09 04.43 +16 33 11.3 69987 695 Ca3208 1998 11 26.32836 03 08 30.74 +16 30 58.0 23.1R 69987 695 Ca3208 1998 11 27.32464 03 08 26.02 +16 30 39.2 69987 695 Ca3208 1998 11 27.44027 03 08 25.47 +16 30 37.2 69987 695 Ca3208 1999 10 06.55934 03 17 55.98 +17 08 26.3 69987 568 Ca6740 1999 10 09.53349 03 17 44.81 +17 07 40.8 69987 568 Ca6740 1999 10 09.57011 03 17 44.67 +17 07 40.3 69987 568 Ca6740 2000 11 23.19933 03 19 43.59 +17 15 08.8 23.3R 69987 695 Cc2190 2000 11 23.40068 03 19 42.60 +17 15 04.9 69987 695 Cc2190 2002 02 06.38530 03 21 38.60 +17 23 58.7 22.5R 69987 568 Cf1458 2002 02 07.38311 03 21 38.91 +17 24 01.5 69987 568 Cf1458 2003 10 22.31963 03 38 58.09 +18 24 46.0 23.5R 69987 304 Ci9217 2003 10 22.33438 03 38 57.97 +18 24 45.7 69987 304 Ci9217
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 -0.18 0.00 -0.64 2 0.0002 0.00 -0.17 0.00 0.08 3 0.0004 0.00 -0.16 0.00 0.00 4 0.0194 0.00 -0.05 0.00 0.28 5 0.0222 0.00 0.12 0.00 0.15 6 0.0225 0.00 0.18 0.00 0.34 7 0.8798 0.00 -0.02 0.00 -0.53 8 0.8879 0.00 0.04 0.00 -0.31 9 0.8880 0.00 0.11 0.00 -0.23 10 2.0122 0.00 0.24 0.00 0.14 11 2.0128 0.00 0.45 0.00 -0.06 12 3.2174 0.00 -0.01 0.00 0.03 13 3.2201 0.00 -0.35 0.00 -0.04 14 4.9229 0.00 0.44 0.00 0.13 15 4.9230 0.00 -0.38 0.00 0.06
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.
69987 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.866 42.866 42.866 ecceobj 0.027 0.027 0.027 incobj 1.047 1.047 1.047 qmin 40.242 40.248 40.247 qmax 45.016 45.038 45.023 amean 42.558 42.558 42.558 amin 42.236 42.235 42.237 amax 42.894 42.893 42.893 emean 0.032 0.032 0.032 emin 0.008 0.008 0.008 emax 0.050 0.051 0.050 imean 2.133 2.133 2.133 imin 0.774 0.774 0.774 imax 3.017 3.016 3.018 fracstop 1.000 1.000 1.000 cjmean 3.081 3.081 3.081 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 183.6 183.6 183.5 kozaiamp 180.0 180.0 180.0