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: 15FW490
# Created Sun Feb 23 02:10:20 2025
# Orbit generated from Bernstein formalism
# Fitting 10 observations of 10
# Arc: 7.04d
# First observation: 2015/03/18
# Last observation: 2015/03/25
# WARNING Fitting with energy constraint
# WARNING and with gdot fixed = 0
# Chi-squared of fit: 3.50 DOF: 16 RMS: 0.10
# Min/Max residuals: -0.23 0.16
# Exact a, adot, b, bdot, g, gdot:
1.517539E-05 2.384198E-02 4.792277E-07 1.102994E-03 2.434498E-02 0.000000E+00
# Covariance matrix:
3.0847E-11 4.7113E-08 -1.5010E-14 -2.7651E-12 7.4790E-09 0.0000E+00
4.7113E-08 7.2678E-05 -2.3145E-11 -4.2639E-09 1.1533E-05 0.0000E+00
-1.5010E-14 -2.3145E-11 2.8220E-13 -1.8358E-11 -3.6728E-12 0.0000E+00
-2.7651E-12 -4.2639E-09 -1.8358E-11 2.4914E-09 -6.7661E-10 0.0000E+00
7.4790E-09 1.1533E-05 -3.6728E-12 -6.7661E-10 1.8301E-06 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 1.8987E-04
# lat0 lon0 xBary yBary zBary JD0
0.331805 -178.575442 0.070524 0.005859 -0.989626 2457099.974968
# Heliocentric elements and errors
Epoch: 2457090.5000 = 2015/03/09
Mean Anomaly: 359.27777 +/- 40.221
Argument of Peri: 7.71661 +/- 106.680
Long of Asc Node: 174.34991 +/- 2.484
Inclination: 2.66493 +/- 0.944
Eccentricity: 0.02861152 +/- 0.5626
Semi-Major Axis: 43.30804303 +/- 22.7331
Time of Perihelion: 2457299.3456 +/- 323930.9
Perihelion: 42.06893414 +/- 32.8828
Aphelion: 44.54715193 +/- 33.7702
Period (y) 285.0106 +/- 224.41
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.05704584 +/- 2.2818
Ecliptic Y -0.97545504 +/- 0.0566
Ecliptic Z 0.23791023 +/- 0.0132
Ecliptic XDOT 0.00006396 +/- 0.0015
Ecliptic YDOT -0.00268621 +/- 0.0008
Ecliptic ZDOT 0.00012413 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.06902921 +/- 2.2811
Geocenter to KBO 41.07623040 +/- 2.2825
# Hcoef: 9.51
The following table shows the complete astrometric record for 15FW490. 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 (15FW490) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.47419 12 05 45.36 -00 15 43.8 25.8r 15FW490 T09 C~8eRi 2015 03 18.53399 12 05 45.08 -00 15 42.0 25.5r 15FW490 T09 C~8eRi 2015 03 18.56444 12 05 44.95 -00 15 41.2 26.0r 15FW490 T09 C~8eRi 2015 03 20.41961 12 05 36.70 -00 14 46.1 25.1i 15FW490 T09 C~8eRi 2015 03 20.49422 12 05 36.35 -00 14 43.9 25.3i 15FW490 T09 C~8eRi 2015 03 20.49965 12 05 36.34 -00 14 43.7 25.3i 15FW490 T09 C~8eRi 2015 03 20.53554 12 05 36.15 -00 14 42.7 25.8i 15FW490 T09 C~8eRi 2015 03 25.48492 12 05 14.08 -00 12 15.7 25.7g 15FW490 T09 C~8eRi 2015 03 25.51107 12 05 13.98 -00 12 14.9 26.1g 15FW490 T09 C~8eRi 2015 03 25.51323 12 05 13.97 -00 12 15.1 26.0g 15FW490 T09 C~8eRi
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 0.06 0.00 0.05
2 0.0002 -4.57 -0.07 -0.02 0.02
3 0.0002 -6.68 0.07 -0.06 -0.03
4 0.0053 -142.13 0.08 1.29 0.04
5 0.0055 -147.82 -0.06 1.22 -0.04
6 0.0055 -148.04 0.12 1.34 0.08
7 0.0056 -151.05 -0.23 1.13 -0.14
8 0.0192 -513.26 -0.19 4.36 -0.00
9 0.0193 -514.95 0.06 4.49 0.13
10 0.0193 -515.01 0.16 4.25 -0.11
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.
15FW490 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