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: 15FA491 # Created Sun Feb 23 02:10:20 2025 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 7.08d # First observation: 2015/03/18 # Last observation: 2015/03/25 # WARNING Fitting with energy constraint # WARNING and with gdot fixed = 0 # Chi-squared of fit: 5.87 DOF: 16 RMS: 0.14 # Min/Max residuals: -0.31 0.27 # Exact a, adot, b, bdot, g, gdot: 1.465375E-05 2.505335E-02 -2.493081E-07 -1.018165E-04 2.516249E-02 0.000000E+00 # Covariance matrix: 3.2460E-11 5.1231E-08 9.8741E-14 1.7994E-11 8.1316E-09 0.0000E+00 5.1231E-08 8.1547E-05 1.5712E-10 2.8632E-08 1.2939E-05 0.0000E+00 9.8741E-14 1.5712E-10 2.5469E-13 -1.5542E-11 2.4931E-11 0.0000E+00 1.7994E-11 2.8632E-08 -1.5542E-11 2.2732E-09 4.5433E-09 0.0000E+00 8.1316E-09 1.2939E-05 2.4931E-11 4.5433E-09 2.0531E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 2.0964E-04 # lat0 lon0 xBary yBary zBary JD0 -0.681530 -178.685385 0.068778 -0.011644 -0.989696 2457099.966198 # Heliocentric elements and errors Epoch: 2457090.5000 = 2015/03/09 Mean Anomaly: 359.16946 +/- 100.397 Argument of Peri: 251.70228 +/- 167.605 Long of Asc Node: 290.35801 +/- 10.856 Inclination: 0.70381 +/- 0.047 Eccentricity: 0.02722204 +/- 0.5651 Semi-Major Axis: 41.87434593 +/- 22.0009 Time of Perihelion: 2457318.8394 +/- 324523.5 Perihelion: 40.73444095 +/- 31.9069 Aphelion: 43.01425091 +/- 32.7224 Period (y) 270.9756 +/- 213.56 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -40.72261156 +/- 2.2623 Ecliptic Y -0.86579847 +/- 0.0517 Ecliptic Z -0.47270860 +/- 0.0269 Ecliptic XDOT 0.00005925 +/- 0.0016 Ecliptic YDOT -0.00273103 +/- 0.0008 Ecliptic ZDOT -0.00001099 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 40.73455723 +/- 2.2617 Geocenter to KBO 39.74169015 +/- 2.2631 # Hcoef: 9.18
The following table shows the complete astrometric record for 15FA491. 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 (15FA491) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.46542 12 03 44.42 -01 08 53.5 25.1r 15FA491 T09 C~8eRi 2015 03 18.50126 12 03 44.24 -01 08 52.3 24.0r 15FA491 T09 C~8eRi 2015 03 18.53187 12 03 44.10 -01 08 51.5 25.1r 15FA491 T09 C~8eRi 2015 03 18.55800 12 03 43.97 -01 08 50.6 25.2r 15FA491 T09 C~8eRi 2015 03 20.45248 12 03 35.23 -01 07 54.0 25.3i 15FA491 T09 C~8eRi 2015 03 20.49142 12 03 35.05 -01 07 53.0 24.2i 15FA491 T09 C~8eRi 2015 03 20.53283 12 03 34.85 -01 07 52.0 24.6i 15FA491 T09 C~8eRi 2015 03 25.50893 12 03 11.89 -01 05 22.8 25.9g 15FA491 T09 C~8eRi 2015 03 25.53475 12 03 11.78 -01 05 22.2 26.1g 15FA491 T09 C~8eRi 2015 03 25.54330 12 03 11.74 -01 05 21.5 26.6g 15FA491 T09 C~8eRi
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 0.22 0.00 0.04
2 0.0001 -2.95 0.01 0.03 0.09
3 0.0002 -5.20 0.10 -0.07 0.01
4 0.0003 -7.35 -0.05 -0.02 0.07
5 0.0054 -150.12 -0.21 -0.23 0.08
6 0.0055 -152.99 -0.10 -0.39 -0.06
7 0.0057 -156.14 -0.08 -0.66 -0.31
8 0.0193 -531.41 -0.05 -0.74 -0.05
9 0.0194 -533.17 0.17 -0.85 -0.14
10 0.0194 -533.99 -0.01 -0.45 0.27
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.
15FA491 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