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: 15FY397 # Created Mon Jul 7 01:10:30 2025 # Orbit generated from Bernstein formalism # Fitting 17 observations of 17 # Arc: 65.88d # First observation: 2015/03/18 # Last observation: 2015/05/23 Preliminary a, adot, b, bdot, g, gdot: -0.000001 0.030468 0.000001 0.000338 0.025211 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 11.52 DOF: 29 RMS: 0.15 # Min/Max residuals: -0.40 0.30 # Exact a, adot, b, bdot, g, gdot: 1.416581E-05 2.221676E-02 -9.006832E-08 4.330490E-04 2.390645E-02 1.123650E-02 # Covariance matrix: 8.2058E-13 6.9989E-10 8.2104E-14 -8.0039E-12 1.1261E-10 -6.4703E-09 6.9989E-10 1.0204E-06 1.2076E-10 -1.1805E-08 1.5887E-07 -1.0790E-05 8.2104E-14 1.2076E-10 1.4222E-13 -2.2305E-12 1.8789E-11 -1.2807E-09 -8.0039E-12 -1.1805E-08 -2.2305E-12 1.5357E-10 -1.8364E-09 1.2530E-07 1.1261E-10 1.5887E-07 1.8789E-11 -1.8364E-09 2.4795E-08 -1.6645E-06 -6.4703E-09 -1.0790E-05 -1.2807E-09 1.2530E-07 -1.6645E-06 1.1828E-04 # lat0 lon0 xBary yBary zBary JD0 -1.057894 -179.264592 0.058769 -0.018156 -0.990243 2457099.966191 # Heliocentric elements and errors Epoch: 2457090.5000 = 2015/03/09 Mean Anomaly: 42.22225 +/- 35.853 Argument of Peri: 219.99082 +/- 1.166 Long of Asc Node: 223.78413 +/- 1.772 Inclination: 1.51138 +/- 0.050 Eccentricity: 0.47875208 +/- 0.4528 Semi-Major Axis: 52.37445824 +/- 26.2008 Time of Perihelion: 2440853.0963 +/- 6453.6 Perihelion: 27.30007725 +/- 27.3682 Aphelion: 77.44883923 +/- 45.4273 Period (y) 379.0422 +/- 284.43 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -42.81333632 +/- 0.2755 Ecliptic Y -0.49089596 +/- 0.0035 Ecliptic Z -0.77227741 +/- 0.0051 Ecliptic XDOT -0.00125819 +/- 0.0013 Ecliptic YDOT -0.00256643 +/- 0.0001 Ecliptic ZDOT 0.00002592 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.82311476 +/- 0.2754 Geocenter to KBO 41.82971280 +/- 0.2755 # Hcoef: 8.43
The following table shows the complete astrometric record for 15FY397. 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 (15FY397) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.465413 12 01 00.929 -01 15 47.22 24.4r 15FY397 568 C~2TuH 2015 03 18.501246 12 01 00.765 -01 15 46.29 24.2r 15FY397 568 C~2TuH 2015 03 18.529657 12 01 00.639 -01 15 45.44 24.4r 15FY397 568 C~2TuH 2015 03 20.40902 12 00 52.30 -01 14 51.0 24.0i 15FY397 T09 C~8vFT 2015 03 20.44977 12 00 52.12 -01 14 49.6 24.5i 15FY397 T09 C~8vFT 2015 03 22.46558 12 00 43.18 -01 13 51.1 24.7i 15FY397 T09 C~8vFT 2015 03 22.47680 12 00 43.13 -01 13 50.6 24.9i 15FY397 T09 C~8vFT 2015 03 22.49915 12 00 43.01 -01 13 50.1 24.8i 15FY397 T09 C~8vFT 2015 03 25.443007 12 00 30.001 -01 12 24.50 25.4g 15FY397 568 C~2TuH 2015 03 25.476336 12 00 29.848 -01 12 23.56 25.3g 15FY397 568 C~2TuH 2015 03 25.506759 12 00 29.716 -01 12 22.76 25.2g 15FY397 568 C~2TuH 2015 03 25.532520 12 00 29.599 -01 12 22.03 25.0g 15FY397 568 C~2TuH 2015 03 25.543291 12 00 29.559 -01 12 21.63 24.9g 15FY397 568 C~2TuH 2015 05 23.25307 11 57 11.76 -00 49 50.1 24.3z 15FY397 T09 C~8vFT 2015 05 23.27419 11 57 11.75 -00 49 49.8 24.3z 15FY397 T09 C~8vFU 2015 05 23.29175 11 57 11.69 -00 49 49.3 24.8z 15FY397 T09 C~8vFU 2015 05 23.34721 11 57 11.59 -00 49 49.3 24.6z 15FY397 T09 C~8vFU
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 0.11 0.00 0.08
2 0.0001 -2.63 0.12 -0.13 -0.03
3 0.0002 -4.70 0.13 -0.10 0.00
4 0.0053 -141.09 -0.09 0.10 -0.14
5 0.0054 -144.12 -0.12 0.31 0.09
6 0.0110 -290.40 -0.05 0.64 0.02
7 0.0110 -291.28 -0.11 0.80 0.18
8 0.0110 -293.13 -0.32 0.54 -0.07
9 0.0191 -506.18 0.02 1.45 0.02
10 0.0192 -508.66 -0.01 1.40 -0.02
11 0.0193 -510.79 0.09 1.35 -0.07
12 0.0193 -512.69 0.08 1.32 -0.10
13 0.0194 -513.40 0.16 1.45 0.03
14 0.1801 -3773.16 -0.04 60.62 -0.02
15 0.1802 -3773.42 0.30 60.83 0.17
16 0.1802 -3774.45 -0.23 60.93 0.26
17 0.1804 -3775.82 -0.04 60.34 -0.40
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.
15FY397 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