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: 15FU561
# Created Mon Jul 7 01:10:32 2025
# Orbit generated from Bernstein formalism
# Fitting 20 observations of 20
# Arc: 10.88d
# First observation: 2015/03/18
# Last observation: 2015/03/29
Preliminary a, adot, b, bdot, g, gdot:
0.000000 0.031916 -0.000000 -0.011935 0.027857 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# Chi-squared of fit: 5.51 DOF: 35 RMS: 0.09
# Min/Max residuals: -0.17 0.21
# Exact a, adot, b, bdot, g, gdot:
1.407478E-05 2.332459E-02 -7.217370E-06 -1.193427E-02 2.648732E-02 -9.064869E-03
# Covariance matrix:
4.3578E-11 7.0847E-08 -1.9654E-13 4.2629E-12 1.1281E-08 3.0264E-08
7.0847E-08 1.1581E-04 -3.2570E-10 8.6089E-09 1.8435E-05 4.4904E-05
-1.9654E-13 -3.2570E-10 1.8846E-13 -7.9420E-12 -5.1715E-11 6.7890E-11
4.2629E-12 8.6089E-09 -7.9420E-12 5.6695E-10 1.3217E-09 -6.8038E-08
1.1281E-08 1.8435E-05 -5.1715E-11 1.3217E-09 2.9348E-06 7.2837E-06
3.0264E-08 4.4904E-05 6.7890E-11 -6.8038E-08 7.2837E-06 2.1567E-04
# lat0 lon0 xBary yBary zBary JD0
0.793267 -179.023159 0.062789 0.013837 -0.990068 2457099.974968
# Heliocentric elements and errors
Epoch: 2457090.5000 = 2015/03/09
Mean Anomaly: 302.10245 +/- 64.046
Argument of Peri: 274.62776 +/- 87.618
Long of Asc Node: 2.39589 +/- 0.689
Inclination: 27.07117 +/- 10.700
Eccentricity: 0.33476495 +/- 0.5357
Semi-Major Axis: 42.02800194 +/- 22.2656
Time of Perihelion: 2473095.8153 +/- 12316.3
Perihelion: 27.95850016 +/- 26.9508
Aphelion: 56.09750373 +/- 37.2853
Period (y) 272.4685 +/- 216.52
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -38.73901671 +/- 2.4412
Ecliptic Y -0.59777497 +/- 0.0414
Ecliptic Z 0.52243424 +/- 0.0338
Ecliptic XDOT 0.00095737 +/- 0.0015
Ecliptic YDOT -0.00240068 +/- 0.0010
Ecliptic ZDOT -0.00124635 +/- 0.0001
# Distances at JD0 (AU)
Heliocenter to KBO 38.74715071 +/- 2.4407
Geocenter to KBO 37.75391153 +/- 2.4418
# Hcoef: 7.26
The following table shows the complete astrometric record for 15FU561. 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 (15FU561) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.47419 12 04 50.82 +00 20 21.4 23.0r 15FU561 T09 C~8vFX 2015 03 18.50772 12 04 50.64 +00 20 22.2 23.0r 15FU561 T09 C~8vFX 2015 03 18.55140 12 04 50.42 +00 20 23.4 23.1r 15FU561 T09 C~8vFX 2015 03 18.57737 12 04 50.28 +00 20 24.1 23.0r 15FU561 T09 C~8vFX 2015 03 20.41961 12 04 40.83 +00 21 12.1 22.8i 15FU561 T09 C~8vFX 2015 03 20.46072 12 04 40.63 +00 21 13.3 22.8i 15FU561 T09 C~8vFX 2015 03 20.46343 12 04 40.60 +00 21 13.3 22.9i 15FU561 T09 C~8vFX 2015 03 20.49965 12 04 40.43 +00 21 14.2 22.6i 15FU561 T09 C~8vFX 2015 03 20.55748 12 04 40.12 +00 21 15.8 22.8i 15FU561 T09 C~8vFX 2015 03 25.45174 12 04 14.95 +00 23 23.5 23.5g 15FU561 T09 C~8vFX 2015 03 25.46918 12 04 14.87 +00 23 24.0 23.5g 15FU561 T09 C~8vFX 2015 03 25.48492 12 04 14.78 +00 23 24.4 23.5g 15FU561 T09 C~8vFX 2015 03 25.51323 12 04 14.64 +00 23 25.0 23.5g 15FU561 T09 C~8vFX 2015 03 25.55400 12 04 14.43 +00 23 26.2 23.4g 15FU561 T09 C~8vFX 2015 03 29.25584 12 03 55.50 +00 25 01.6 23.2y 15FU561 T09 C~8vFX 2015 03 29.29637 12 03 55.30 +00 25 02.6 22.8y 15FU561 T09 C~8vFX 2015 03 29.31534 12 03 55.18 +00 25 03.3 22.6y 15FU561 T09 C~8vFX 2015 03 29.32352 12 03 55.14 +00 25 03.3 22.6y 15FU561 T09 C~8vFX 2015 03 29.33991 12 03 55.07 +00 25 04.0 22.7y 15FU561 T09 C~8vFX 2015 03 29.35897 12 03 54.96 +00 25 04.3 22.8y 15FU561 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 -0.03 0.00 0.02
2 0.0001 -2.80 -0.07 -0.34 -0.08
3 0.0002 -6.30 0.01 -0.55 0.02
4 0.0003 -8.51 -0.07 -0.74 0.01
5 0.0053 -157.65 -0.05 -13.08 -0.12
6 0.0054 -160.88 0.11 -13.17 0.08
7 0.0054 -161.29 -0.08 -13.35 -0.08
8 0.0055 -163.99 0.21 -13.54 -0.00
9 0.0057 -168.89 0.06 -13.92 0.03
10 0.0191 -566.08 -0.13 -46.91 0.01
11 0.0192 -567.38 0.00 -46.93 0.12
12 0.0192 -568.78 -0.10 -47.10 0.07
13 0.0193 -570.94 0.06 -47.38 -0.01
14 0.0194 -574.31 0.03 -47.54 0.13
15 0.0295 -872.78 0.07 -72.93 -0.07
16 0.0296 -875.93 0.21 -73.21 -0.06
17 0.0297 -877.86 -0.17 -73.28 0.01
18 0.0297 -878.41 -0.06 -73.52 -0.17
19 0.0297 -879.65 0.03 -73.29 0.17
20 0.0298 -881.28 -0.05 -73.67 -0.07
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.
15FU561 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