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: 15FW398
# Created Sun Oct 19 01:10:46 2025
# Orbit generated from Bernstein formalism
# Fitting 11 observations of 11
# Arc: 6.99d
# 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: 0.72 DOF: 18 RMS: 0.05
# Min/Max residuals: -0.10 0.08
# Exact a, adot, b, bdot, g, gdot:
1.605657E-05 2.580993E-02 2.930733E-06 5.110281E-03 2.598066E-02 0.000000E+00
# Covariance matrix:
3.5417E-11 5.7923E-08 -1.8916E-13 -3.6958E-11 9.1948E-09 0.0000E+00
5.7923E-08 9.5382E-05 -3.1139E-10 -6.0841E-08 1.5136E-05 0.0000E+00
-1.8916E-13 -3.1139E-10 2.2224E-13 -1.6073E-11 -4.9417E-11 0.0000E+00
-3.6958E-11 -6.0841E-08 -1.6073E-11 3.0583E-09 -9.6554E-09 0.0000E+00
9.1948E-09 1.5136E-05 -4.9417E-11 -9.6554E-09 2.4021E-06 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 2.3077E-04
# lat0 lon0 xBary yBary zBary JD0
1.572440 -178.602423 0.069699 0.027285 -0.989330 2457099.995551
# Heliocentric elements and errors
Epoch: 2457090.5000 = 2015/03/09
Mean Anomaly: 358.88247 +/- 351.550
Argument of Peri: 9.00824 +/- 58.023
Long of Asc Node: 173.58696 +/- 2.881
Inclination: 11.28262 +/- 4.092
Eccentricity: 0.02987638 +/- 0.5659
Semi-Major Axis: 40.69837878 +/- 21.3752
Time of Perihelion: 2457384.8872 +/- 282276.0
Perihelion: 39.48245854 +/- 30.9917
Aphelion: 41.91429901 +/- 31.8604
Period (y) 259.6414 +/- 204.55
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.45845040 +/- 2.2946
Ecliptic Y -0.89306186 +/- 0.0558
Ecliptic Z 1.05633262 +/- 0.0630
Ecliptic XDOT 0.00007769 +/- 0.0016
Ecliptic YDOT -0.00272446 +/- 0.0009
Ecliptic ZDOT 0.00053841 +/- 0.0001
# Distances at JD0 (AU)
Heliocenter to KBO 39.48268868 +/- 2.2932
Geocenter to KBO 38.49017230 +/- 2.2961
# Hcoef: 9.42
The following table shows the complete astrometric record for 15FW398. 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 (15FW398) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.494773 12 07 37.830 +00 53 12.77 25.3r 15FW398 568 C~2TuI 2015 03 18.507709 12 07 37.769 +00 53 13.15 25.1r 15FW398 568 C~2TuI 2015 03 18.522848 12 07 37.702 +00 53 13.67 25.3r 15FW398 568 C~2TuI 2015 03 18.551388 12 07 37.566 +00 53 14.60 25.3r 15FW398 568 C~2TuI 2015 03 20.444244 12 07 28.716 +00 54 18.49 25.0i 15FW398 568 C~2TuI 2015 03 20.483035 12 07 28.533 +00 54 19.73 24.5i 15FW398 568 C~2TuI 2015 03 20.496906 12 07 28.468 +00 54 20.27 24.8i 15FW398 568 C~2TuI 2015 03 20.521711 12 07 28.347 +00 54 21.12 24.7i 15FW398 568 C~2TuI 2015 03 20.557468 12 07 28.174 +00 54 22.32 24.6i 15FW398 568 C~2TuI 2015 03 25.47205 12 07 05.14 +00 57 07.6 26.5g 15FW398 T09 C~90HW 2015 03 25.48492 12 07 05.07 +00 57 08.2 26.4g 15FW398 T09 C~90HW
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 -0.07 0.00 0.04
2 0.0000 -0.99 -0.04 -0.02 -0.01
3 0.0001 -2.12 0.02 0.06 0.03
4 0.0002 -4.36 0.03 0.10 -0.01
5 0.0053 -151.56 0.00 5.94 -0.01
6 0.0054 -154.57 0.06 5.98 -0.06
7 0.0055 -155.68 0.05 6.09 0.01
8 0.0055 -157.68 0.01 6.15 0.01
9 0.0056 -160.54 -0.03 6.22 -0.01
10 0.0191 -543.24 0.08 20.48 -0.04
11 0.0191 -544.44 -0.10 20.61 0.06
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.
15FW398 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