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: 91205 # Created Sun Dec 22 02:06:51 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 27 observations of 27 # Arc: 24.18y # First observation: 1998/10/22 # Last observation: 2022/12/26 # Chi-squared of fit: 80.51 DOF: 48 RMS: 0.31 # Min/Max residuals: -0.71 0.58 # Exact a, adot, b, bdot, g, gdot: 1.648581E-05 3.173016E-02 -4.149897E-06 -5.916774E-03 2.914963E-02 3.037372E-03 # 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 -0.955718 49.382323 0.342667 -0.015689 -0.926937 2451108.907011 # Heliocentric elements and errors Epoch: 2451108.5000 = 1998/10/22 Mean Anomaly: 33.19181 +/- 0.000 Argument of Peri: 141.78916 +/- 0.000 Long of Asc Node: 223.82692 +/- 0.000 Inclination: 10.58281 +/- 0.000 Eccentricity: 0.13844560 +/- 0.0000 Semi-Major Axis: 39.54872239 +/- 0.0000 Time of Perihelion: 2442732.7153 +/- 0.0 Perihelion: 34.07337564 +/- 0.0000 Aphelion: 45.02406914 +/- 0.0000 Period (y) 248.7178 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 23.20183614 +/- 0.0000 Ecliptic Y 26.51692479 +/- 0.0000 Ecliptic Z -0.57234472 +/- 0.0000 Ecliptic XDOT -0.00208281 +/- 0.0000 Ecliptic YDOT 0.00215873 +/- 0.0000 Ecliptic ZDOT -0.00056044 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 35.23913211 +/- 0.0000 Geocenter to KBO 34.30573531 +/- 0.0000 # Hcoef: 8.25
The following table shows the complete astrometric record for 91205. 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 (91205) followed by the observatory code and reference code for the source of the astrometry.
1998 10 22.40628 03 08 48.43 +16 39 15.3 22.8R 91205 695 Ca3120 1998 10 22.49369 03 08 47.93 +16 39 12.7 91205 695 Ca3120 1998 11 18.13535 03 06 18.37 +16 27 28.1 22.6R 91205 695 Ca3120 1998 11 18.20454 03 06 18.00 +16 27 26.2 91205 695 Ca3120 1998 12 17.95527 03 03 45.48 +16 15 35.9 91205 950 Ca3601 1998 12 18.00257 03 03 45.30 +16 15 35.6 91205 950 Ca3601 1998 12 18.03799 03 03 45.12 +16 15 34.0 91205 950 Ca3601 1999 10 06.55934 03 17 46.28 +16 54 48.2 91205 568 Ca6740 1999 10 09.53349 03 17 33.50 +16 53 45.2 91205 568 Ca6740 1999 10 09.57011 03 17 33.32 +16 53 44.2 91205 568 Ca6740 1999 10 09.60427 03 17 33.15 +16 53 43.6 23.4R 91205 568 Ca6740 1999 10 09.63619 03 17 33.05 +16 53 42.9 23.3R 91205 568 Ca6740 2000 12 28.31163 03 18 17.672 +16 31 40.74 23.2R 91205 568 Cl4052 2000 12 28.38018 03 18 17.407 +16 31 39.64 23.0R 91205 568 Cl4052 2003 10 01.56099 03 48 19.49 +17 21 57.5 23.1R 91205 568 Ci6851 2003 10 01.59893 03 48 19.38 +17 21 56.8 91205 568 Ci6851 2003 12 21.158989 03 41 29.38 +16 54 27.3 91205 645 C~1RtE 2003 12 21.159818 03 41 29.38 +16 54 27.2 91205 645 C~1RtE 2003 12 21.162306 03 41 29.37 +16 54 27.2 91205 645 C~1RtE 2008 11 02.74055 04 22 51.07 +17 20 35.3 25.3R 91205 250 S~06GZ 2008 11 02.74749 04 22 51.04 +17 20 35.2 91205 250 S~06GZ 2008 11 02.75374 04 22 51.00 +17 20 35.0 91205 250 S~06GZ 2008 11 02.76069 04 22 50.98 +17 20 35.0 91205 250 S~06GZ 2016 02 04.18230 05 04 56.12 +16 42 53.9 23.6R 91205 G37 C~1mS8 2016 02 04.31003 05 04 55.81 +16 42 54.2 91205 G37 C~1mS8 2022 12 26.305010 05 54 44.888 +15 41 20.58 24.7G 91205 G37 C~6AK2 2022 12 26.359920 05 54 44.542 +15 41 20.43 91205 G37 C~6AK2
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 0.10 0.00 0.23
2 0.0002 0.00 -0.37 0.00 -0.13
3 0.0732 0.00 -0.55 0.00 0.54
4 0.0734 0.00 -0.12 0.00 0.45
5 0.1548 0.00 -0.29 0.00 -0.08
6 0.1550 0.00 0.10 0.00 0.57
7 0.1550 0.00 -0.29 0.00 -0.32
8 0.9559 0.00 0.13 0.00 -0.42
9 0.9641 0.00 0.38 0.00 0.10
10 0.9642 0.00 0.16 0.00 -0.10
11 0.9643 0.00 -0.08 0.00 0.05
12 0.9644 0.00 0.58 0.00 0.06
13 2.1845 0.00 0.05 0.00 0.27
14 2.1847 0.00 -0.03 0.00 0.22
15 4.9422 0.00 -0.35 0.00 -0.01
16 4.9423 0.00 -0.14 0.00 -0.07
17 5.1629 0.00 0.31 0.00 -0.62
18 5.1629 0.00 0.37 0.00 -0.71
19 5.1629 0.00 0.40 0.00 -0.67
20 10.0324 0.00 -0.20 0.00 0.20
21 10.0324 0.00 -0.12 0.00 0.23
22 10.0324 0.00 -0.25 0.00 0.14
23 10.0325 0.00 -0.02 0.00 0.27
24 17.2862 0.00 -0.14 0.00 0.16
25 17.2865 0.00 0.33 0.00 0.14
26 24.1777 0.00 0.27 0.00 0.10
27 24.1778 0.00 -0.22 0.00 0.03
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.
91205 quality flag:3 Type: 3:2E 3:2E 3:2E axisobj 39.624 39.624 39.624 ecceobj 0.139 0.139 0.139 incobj 10.572 10.572 10.572 qmin 33.544 33.544 33.545 qmax 45.947 45.946 45.952 amean 39.458 39.458 39.458 amin 39.002 39.007 38.999 amax 39.950 39.944 39.955 emean 0.130 0.130 0.130 emin 0.110 0.112 0.110 emax 0.150 0.150 0.150 imean 12.146 12.156 12.146 imin 11.357 11.357 11.357 imax 12.933 12.926 12.926 excite_mean 0.247 0.247 0.247 fracstop 1.000 1.000 1.000 cjmean 2.982 2.982 2.982 libcent 0 179.9 180.5 180.2 libamp 0 105.1 104.5 104.8 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 178.7 176.4 178.8 kozaiamp 179.9 180.0 179.9