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: 15KF172 # Created Sat Apr 20 01:17:20 2024 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 2.99y # First observation: 2015/05/20 # Last observation: 2018/05/17 Preliminary a, adot, b, bdot, g, gdot: 0.000003 0.011425 0.000001 -0.002102 0.015869 0.000000 # Chi-squared of fit: 11.76 DOF: 10 RMS: 0.21 # Min/Max residuals: -0.57 0.37 # Exact a, adot, b, bdot, g, gdot: 1.244735E-05 1.123652E-02 -1.791668E-06 -2.069619E-03 1.578199E-02 -5.279313E-03 # Covariance matrix: 9.1971E-13 1.5384E-11 3.2651E-15 -2.8309E-12 1.8594E-11 4.5740E-10 1.5384E-11 4.4026E-10 9.5618E-14 -8.0244E-11 5.2299E-10 1.2967E-08 3.2651E-15 9.5618E-14 3.6835E-13 -1.4261E-13 1.1007E-13 2.8055E-12 -2.8309E-12 -8.0244E-11 -1.4261E-13 1.4714E-11 -9.5460E-11 -2.3641E-09 1.8594E-11 5.2299E-10 1.1007E-13 -9.5460E-11 6.2706E-10 1.5424E-08 4.5740E-10 1.2967E-08 2.8055E-12 -2.3641E-09 1.5424E-08 3.8202E-07 # lat0 lon0 xBary yBary zBary JD0 -6.303975 -130.439033 -0.159961 -0.109383 -0.991392 2457162.536808 # Heliocentric elements and errors Epoch: 2457160.5000 = 2015/05/18 Mean Anomaly: 298.67681 +/- 5.614 Argument of Peri: 321.24956 +/- 2.358 Long of Asc Node: 19.03767 +/- 0.017 Inclination: 12.03646 +/- 0.005 Eccentricity: 0.41607810 +/- 0.0442 Semi-Major Axis: 66.74325765 +/- 3.1575 Time of Perihelion: 2491086.4330 +/- 1962.4 Perihelion: 38.97285007 +/- 3.4816 Aphelion: 94.51366523 +/- 5.3586 Period (y) 545.2797 +/- 38.69 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -41.37933020 +/- 0.0649 Ecliptic Y -48.79736176 +/- 0.0760 Ecliptic Z -6.95760454 +/- 0.0110 Ecliptic XDOT 0.00209684 +/- 0.0001 Ecliptic YDOT -0.00054769 +/- 0.0001 Ecliptic ZDOT -0.00025623 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 64.35712660 +/- 0.0712 Geocenter to KBO 63.36336916 +/- 0.1005 # Hcoef: 5.51
The following table shows the complete astrometric record for 15KF172. 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 (15KF172) followed by the observatory code and reference code for the source of the astrometry.
2015 05 20.03603 15 01 00.27 -23 40 54.9 15KF172 W84 C~2fCG 2015 05 21.04367 15 00 56.88 -23 40 41.4 23.1r 15KF172 W84 C~2fCG 2015 05 23.03685 15 00 50.19 -23 40 14.6 15KF172 W84 C~2fCG 2015 05 24.03515 15 00 46.86 -23 40 01.0 15KF172 W84 C~2fCG 2018 04 12.15925 15 11 00.118 -24 40 46.36 23.5r 15KF172 807 C~2fCG 2018 04 13.15531 15 10 57.061 -24 40 39.75 23.7r 15KF172 807 C~2fCG 2018 05 16.32511 15 09 03.967 -24 34 58.31 23.3r 15KF172 304 C~2fCG 2018 05 17.34178 15 09 00.396 -24 34 45.40 23.6r 15KF172 304 C~2fCG
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 -0.25 0.00 -0.06
2 0.0028 -48.49 -0.00 -0.17 0.02
3 0.0082 -144.22 0.13 -0.37 -0.01
4 0.0109 -191.94 0.12 -0.22 0.07
5 2.8970 8882.52 -0.02 -1212.93 -0.19
6 2.8997 8840.51 0.07 -1217.58 -0.57
7 2.9905 7260.77 -0.05 -1298.96 0.37
8 2.9933 7210.32 0.01 -1299.57 0.36
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.
15KF172 quality flag:1 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 66.317 78.821 59.504 ecceobj 0.421 0.550 0.300 incobj 12.114 12.099 12.129 qmin 37.871 34.552 41.297 qmax 97.387 129.246 79.488 amean 66.869 79.712 59.938 amin 66.018 78.168 59.309 amax 67.939 82.526 60.718 emean 0.420 0.553 0.298 emin 0.408 0.538 0.287 emax 0.433 0.571 0.309 imean 11.881 11.317 11.932 imin 11.333 10.102 11.652 imax 12.409 12.523 12.247 excite_mean 0.468 0.587 0.362 fracstop 1.000 1.000 1.000 cjmean 3.097 3.036 3.138 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 164.5 170.4 164.0 kozaiamp 180.0 180.0 179.9