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: 15FX561 # Created Thu Jul 3 01:10:29 2025 # Orbit generated from Bernstein formalism # Fitting 17 observations of 17 # Arc: 65.87d # First observation: 2015/03/18 # Last observation: 2015/05/23 Preliminary a, adot, b, bdot, g, gdot: -0.000000 0.030420 0.000001 0.005830 0.025539 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 8.00 DOF: 29 RMS: 0.12 # Min/Max residuals: -0.25 0.23 # Exact a, adot, b, bdot, g, gdot: 1.445228E-05 2.285739E-02 3.684322E-06 5.985084E-03 2.434321E-02 5.210815E-03 # Covariance matrix: 1.3481E-12 1.7567E-09 2.2175E-13 -3.6982E-11 2.7431E-10 -1.9634E-08 1.7567E-09 2.8352E-06 3.6580E-10 -6.1069E-08 4.3791E-07 -3.2913E-05 2.2175E-13 3.6580E-10 1.9142E-13 -8.7699E-12 5.6374E-11 -4.2802E-09 -3.6982E-11 -6.1069E-08 -8.7699E-12 1.3349E-09 -9.4106E-09 7.1481E-07 2.7431E-10 4.3791E-07 5.6374E-11 -9.4106E-09 6.7707E-08 -5.0644E-06 -1.9634E-08 -3.2913E-05 -4.2802E-09 7.1481E-07 -5.0644E-06 3.8725E-04 # lat0 lon0 xBary yBary zBary JD0 -0.873466 179.211257 0.032148 -0.014989 -0.991520 2457099.980898 # Heliocentric elements and errors Epoch: 2457090.5000 = 2015/03/09 Mean Anomaly: 62.61538 +/- 41.846 Argument of Peri: 268.85469 +/- 34.978 Long of Asc Node: 182.42863 +/- 0.252 Inclination: 14.66109 +/- 1.087 Eccentricity: 0.22272147 +/- 0.8255 Semi-Major Axis: 44.65269076 +/- 13.1281 Time of Perihelion: 2438134.4265 +/- 9518.6 Perihelion: 34.70757800 +/- 38.2478 Aphelion: 54.59780352 +/- 40.2049 Period (y) 298.3868 +/- 131.59 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -42.06478407 +/- 0.4390 Ecliptic Y 0.61105606 +/- 0.0061 Ecliptic Z -0.62605471 +/- 0.0067 Ecliptic XDOT -0.00063500 +/- 0.0022 Ecliptic YDOT -0.00256806 +/- 0.0002 Ecliptic ZDOT 0.00066421 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.07388017 +/- 0.4389 Geocenter to KBO 41.07921758 +/- 0.4391 # Hcoef: 8.81
The following table shows the complete astrometric record for 15FX561. 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 (15FX561) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.48012 11 55 42.94 -00 29 15.6 25.2r 15FX561 T09 C~8vFX 2015 03 18.49690 11 55 42.85 -00 29 15.0 25.3r 15FX561 T09 C~8vFX 2015 03 18.53831 11 55 42.67 -00 29 13.6 25.5r 15FX561 T09 C~8vFX 2015 03 18.56877 11 55 42.54 -00 29 12.8 25.0r 15FX561 T09 C~8vFX 2015 03 20.42657 11 55 34.32 -00 28 12.5 24.5i 15FX561 T09 C~8vFX 2015 03 20.46619 11 55 34.14 -00 28 11.3 24.6i 15FX561 T09 C~8vFX 2015 03 20.48863 11 55 34.05 -00 28 10.6 24.8i 15FX561 T09 C~8vFX 2015 03 20.54104 11 55 33.80 -00 28 08.8 24.3i 15FX561 T09 C~8vFX 2015 03 25.45755 11 55 12.10 -00 25 29.2 26.6g 15FX561 T09 C~8vFX 2015 03 25.47635 11 55 12.00 -00 25 28.6 25.7g 15FX561 T09 C~8vFX 2015 03 25.51534 11 55 11.84 -00 25 27.5 25.6g 15FX561 T09 C~8vFX 2015 05 23.28008 11 51 59.46 -00 00 20.2 24.3z 15FX561 T09 C~8vFX 2015 05 23.28882 11 51 59.46 -00 00 19.7 24.8z 15FX561 T09 C~8vFX 2015 05 23.29468 11 51 59.43 -00 00 20.0 24.5z 15FX561 T09 C~8vFX 2015 05 23.33557 11 51 59.36 -00 00 19.2 24.1z 15FX561 T09 C~8vFX 2015 05 23.35010 11 51 59.34 -00 00 18.8 25.0z 15FX561 T09 C~8vFX 2015 05 23.35297 11 51 59.36 -00 00 18.8 24.4z 15FX561 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 0.08 0.00 0.04
2 0.0000 -1.48 -0.14 0.01 0.01
3 0.0002 -4.51 -0.07 0.22 0.10
4 0.0002 -6.62 0.09 0.18 -0.03
5 0.0053 -143.73 -0.02 6.47 -0.00
6 0.0054 -146.68 -0.00 6.49 -0.09
7 0.0055 -148.20 0.16 6.60 -0.05
8 0.0056 -152.35 -0.07 6.76 -0.04
9 0.0191 -514.47 0.05 23.72 0.11
10 0.0192 -516.09 -0.17 23.67 0.01
11 0.0193 -518.73 0.10 23.73 -0.06
12 0.1802 -3766.27 0.12 258.74 -0.20
13 0.1802 -3766.47 0.15 259.19 0.23
14 0.1802 -3766.77 0.01 258.74 -0.25
15 0.1803 -3768.05 -0.18 259.06 -0.09
16 0.1803 -3768.48 -0.23 259.30 0.10
17 0.1804 -3768.21 0.12 259.42 0.21
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.