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: 15FT561 # Created Mon Jul 7 01:10:32 2025 # Orbit generated from Bernstein formalism # Fitting 21 observations of 21 # Arc: 1.06y # First observation: 2015/03/18 # Last observation: 2016/04/08 Preliminary a, adot, b, bdot, g, gdot: 0.000001 0.022348 0.000000 0.000364 0.023458 0.000000 # Chi-squared of fit: 6.30 DOF: 36 RMS: 0.10 # Min/Max residuals: -0.22 0.27 # Exact a, adot, b, bdot, g, gdot: 1.475030E-05 2.237663E-02 4.627993E-07 3.650677E-04 2.344924E-02 1.638515E-03 # Covariance matrix: 3.3678E-13 2.3990E-12 -6.5799E-16 4.7232E-14 2.5347E-12 1.2173E-10 2.3990E-12 8.5902E-11 -2.5531E-14 1.8142E-12 4.1643E-11 4.6737E-09 -6.5799E-16 -2.5531E-14 1.3736E-13 -1.3344E-13 -1.1401E-14 -1.4061E-12 4.7232E-14 1.8142E-12 -1.3344E-13 3.0128E-13 8.1514E-13 9.9853E-11 2.5347E-12 4.1643E-11 -1.1401E-14 8.1514E-13 3.3890E-11 2.1005E-09 1.2173E-10 4.6737E-09 -1.4061E-12 9.9853E-11 2.1005E-09 2.5724E-07 # lat0 lon0 xBary yBary zBary JD0 -0.050725 -177.687711 0.085950 -0.000746 -0.988422 2457099.969108 # Heliocentric elements and errors Epoch: 2457090.5000 = 2015/03/09 Mean Anomaly: 72.75461 +/- 0.537 Argument of Peri: 275.85874 +/- 2.455 Long of Asc Node: 185.23341 +/- 0.003 Inclination: 0.93567 +/- 0.001 Eccentricity: 0.07419526 +/- 0.0227 Semi-Major Axis: 44.38174699 +/- 0.1619 Time of Perihelion: 2435265.0599 +/- 107.9 Perihelion: 41.08883175 +/- 1.0164 Aphelion: 47.67466222 +/- 1.0202 Period (y) 295.6751 +/- 1.62 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -43.60475240 +/- 0.0106 Ecliptic Y -1.67476411 +/- 0.0004 Ecliptic Z -0.03771963 +/- 0.0000 Ecliptic XDOT -0.00008920 +/- 0.0001 Ecliptic YDOT -0.00262398 +/- 0.0000 Ecliptic ZDOT 0.00004254 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.63691888 +/- 0.0106 Geocenter to KBO 42.64530869 +/- 0.0106 # Hcoef: 8.53
The following table shows the complete astrometric record for 15FT561. 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 (15FT561) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.46833 12 08 24.36 -00 57 58.0 24.9r 15FT561 T09 C~8vFX 2015 03 18.50341 12 08 24.20 -00 57 57.0 24.5r 15FT561 T09 C~8vFX 2015 03 18.56444 12 08 23.94 -00 57 55.3 24.6r 15FT561 T09 C~8vFX 2015 03 20.45524 12 08 15.78 -00 57 01.9 24.2i 15FT561 T09 C~8vFX 2015 03 20.49422 12 08 15.60 -00 57 00.5 24.1i 15FT561 T09 C~8vFX 2015 03 25.44596 12 07 54.19 -00 54 40.4 25.0g 15FT561 T09 C~8vFX 2015 03 25.51107 12 07 53.89 -00 54 38.4 25.6g 15FT561 T09 C~8vFX 2015 03 29.24886 12 07 37.79 -00 52 52.9 24.7y 15FT561 T09 C~8vFX 2015 03 29.29096 12 07 37.61 -00 52 51.8 24.1y 15FT561 T09 C~8vFX 2015 03 29.33172 12 07 37.44 -00 52 50.5 23.9y 15FT561 T09 C~8vFX 2015 03 29.35353 12 07 37.34 -00 52 50.0 24.3y 15FT561 T09 C~8vFX 2016 04 02.37629 12 12 01.67 -01 20 03.8 24.6i 15FT561 T09 C~8vFX 2016 04 02.40651 12 12 01.55 -01 20 02.6 24.4i 15FT561 T09 C~8vFX 2016 04 02.43106 12 12 01.44 -01 20 02.1 24.3i 15FT561 T09 C~8vFX 2016 04 02.45551 12 12 01.34 -01 20 01.5 24.3i 15FT561 T09 C~8vFX 2016 04 02.48014 12 12 01.23 -01 20 00.8 24.4i 15FT561 T09 C~8vFX 2016 04 02.50441 12 12 01.13 -01 20 00.1 24.6i 15FT561 T09 C~8vFX 2016 04 08.50164 12 11 35.98 -01 17 15.7 26.1r 15FT561 T09 C~8vFX 2016 04 08.50945 12 11 35.94 -01 17 15.3 25.6r 15FT561 T09 C~8vFX 2016 04 08.51580 12 11 35.90 -01 17 15.3 25.3r 15FT561 T09 C~8vFX 2016 04 08.52214 12 11 35.88 -01 17 15.0 26.0r 15FT561 T09 C~8vFX
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 0.07 0.00 -0.04
2 0.0001 -2.60 -0.02 -0.04 -0.07
3 0.0003 -6.85 0.09 -0.03 -0.05
4 0.0054 -140.38 0.04 0.32 -0.11
5 0.0055 -143.41 -0.19 0.54 0.11
6 0.0191 -493.75 0.09 1.44 0.01
7 0.0193 -498.68 -0.16 1.49 0.08
8 0.0295 -762.19 -0.06 2.29 0.00
9 0.0296 -765.10 0.02 2.23 -0.06
10 0.0297 -767.96 0.06 2.41 0.13
11 0.0298 -769.53 0.05 2.27 -0.00
12 1.0429 3517.81 -0.07 78.41 -0.13
13 1.0430 3515.68 -0.06 78.79 0.27
14 1.0430 3513.97 -0.04 78.60 0.08
15 1.0431 3512.35 0.07 78.55 0.04
16 1.0432 3510.56 0.02 78.54 0.03
17 1.0432 3508.91 0.08 78.59 0.08
18 1.0596 3097.38 0.18 79.64 -0.11
19 1.0597 3096.67 0.00 79.77 0.02
20 1.0597 3096.12 -0.11 79.53 -0.22
21 1.0597 3095.72 -0.07 79.69 -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.
15FT561 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.988 44.679 43.627 ecceobj 0.073 0.134 0.017 incobj 0.940 0.940 0.940 qmin 39.828 37.763 41.990 qmax 48.772 52.272 45.850 amean 44.177 44.853 43.825 amin 43.824 44.475 43.484 amax 44.562 45.282 44.167 emean 0.079 0.139 0.023 emin 0.063 0.123 0.006 emax 0.095 0.155 0.038 imean 2.030 2.057 2.121 imin 1.215 1.095 1.416 imax 2.752 2.880 2.768 excite_mean 0.087 0.144 0.044 fracstop 1.000 1.000 1.000 cjmean 3.095 3.086 3.097 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 204.1 195.5 201.2 kozaiamp 180.0 180.0 180.0