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: 15FC490 # Created Sun Feb 23 02:10:20 2025 # Orbit generated from Bernstein formalism # Fitting 15 observations of 15 # Arc: 10.94d # First observation: 2015/03/18 # Last observation: 2015/03/29 Preliminary a, adot, b, bdot, g, gdot: -0.000000 0.017710 0.000000 -0.000410 0.021263 0.000000 # WARNING Fitting with energy constraint # WARNING MRQMIN stopped after 20 iterations -- oscilliatory solution # Chi-squared of fit: 4.84 DOF: 25 RMS: 0.10 # Min/Max residuals: -0.17 0.27 # Exact a, adot, b, bdot, g, gdot: 1.180170E-05 1.572542E-02 -2.415972E-08 -4.097659E-04 2.094538E-02 -1.081282E-02 # Covariance matrix: 5.4934E-11 7.0104E-08 8.2283E-14 -7.0045E-12 1.1186E-08 5.1892E-08 7.0104E-08 8.9865E-05 1.0544E-10 -8.9687E-09 1.4336E-05 6.5756E-05 8.2283E-14 1.0544E-10 2.2469E-13 -9.4056E-12 1.6822E-11 7.9157E-11 -7.0045E-12 -8.9687E-09 -9.4056E-12 6.9788E-10 -1.4312E-09 -7.3389E-09 1.1186E-08 1.4336E-05 1.6822E-11 -1.4312E-09 2.2872E-06 1.0525E-05 5.1892E-08 6.5756E-05 7.9157E-11 -7.3389E-09 1.0525E-05 1.1278E-04 # lat0 lon0 xBary yBary zBary JD0 -0.113786 178.685345 0.023045 -0.001842 -0.991885 2457099.980898 # Heliocentric elements and errors Epoch: 2457090.5000 = 2015/03/09 Mean Anomaly: 305.14838 +/- 51.067 Argument of Peri: 306.35597 +/- 53.759 Long of Asc Node: 354.36675 +/- 2.571 Inclination: 1.48888 +/- 0.891 Eccentricity: 0.56532345 +/- 0.5597 Semi-Major Axis: 50.13430484 +/- 26.1048 Time of Perihelion: 2476845.9944 +/- 10010.2 Perihelion: 21.79220680 +/- 30.2671 Aphelion: 78.47640287 +/- 49.5689 Period (y) 354.9856 +/- 277.26 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -48.72480185 +/- 3.4463 Ecliptic Y 1.14103941 +/- 0.0794 Ecliptic Z -0.09479964 +/- 0.0068 Ecliptic XDOT 0.00136254 +/- 0.0015 Ecliptic YDOT -0.00209319 +/- 0.0011 Ecliptic ZDOT -0.00005067 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 48.73825267 +/- 3.4454 Geocenter to KBO 47.74322898 +/- 3.4473 # Hcoef: 7.53
The following table shows the complete astrometric record for 15FC490. 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 (15FC490) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.48012 11 54 59.65 +00 25 06.6 24.4r 15FC490 T09 C~8eRh 2015 03 18.51214 11 54 59.51 +00 25 07.6 24.3r 15FC490 T09 C~8eRh 2015 03 18.54702 11 54 59.38 +00 25 08.3 24.2r 15FC490 T09 C~8eRh 2015 03 18.57308 11 54 59.27 +00 25 09.0 24.1r 15FC490 T09 C~8eRh 2015 03 20.42657 11 54 51.82 +00 25 57.2 23.8i 15FC490 T09 C~8eRh 2015 03 20.46619 11 54 51.65 +00 25 58.2 24.0i 15FC490 T09 C~8eRh 2015 03 20.55195 11 54 51.30 +00 26 00.4 23.9i 15FC490 T09 C~8eRh 2015 03 25.45755 11 54 31.58 +00 28 07.4 25.0g 15FC490 T09 C~8eRh 2015 03 25.48926 11 54 31.45 +00 28 08.4 25.2g 15FC490 T09 C~8eRh 2015 03 25.52385 11 54 31.31 +00 28 09.0 25.2g 15FC490 T09 C~8eRh 2015 03 25.54970 11 54 31.20 +00 28 09.7 25.3g 15FC490 T09 C~8eRh 2015 03 29.38231 11 54 15.93 +00 29 48.1 24.3y 15FC490 T09 C~8eRh 2015 03 29.38505 11 54 15.92 +00 29 48.1 23.6y 15FC490 T09 C~8eRh 2015 03 29.41824 11 54 15.79 +00 29 49.3 23.7y 15FC490 T09 C~8eRh 2015 03 29.42099 11 54 15.80 +00 29 49.1 23.6y 15FC490 T09 C~8eRh
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 -0.06
2 0.0001 -2.32 -0.17 0.08 0.04
3 0.0002 -4.39 0.08 -0.05 -0.07
4 0.0003 -6.18 0.02 -0.06 -0.07
5 0.0053 -127.88 0.08 -0.28 0.11
6 0.0054 -130.62 -0.01 -0.38 0.04
7 0.0057 -136.31 0.02 -0.45 0.02
8 0.0191 -458.21 0.01 -1.55 0.02
9 0.0192 -460.40 -0.07 -1.41 0.18
10 0.0193 -462.57 0.05 -1.69 -0.08
11 0.0194 -464.36 -0.03 -1.70 -0.08
12 0.0298 -713.64 -0.09 -2.50 -0.11
13 0.0299 -713.78 -0.04 -2.56 -0.17
14 0.0299 -716.05 -0.13 -2.23 0.18
15 0.0300 -715.83 0.27 -2.36 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.
15FC490 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0