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: 15FG490
# Created Sun Feb 23 02:10:20 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 10.88d
# First observation: 2015/03/18
# Last observation: 2015/03/29
Preliminary a, adot, b, bdot, g, gdot:
-0.000000 0.042243 0.000000 -0.000234 0.027196 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after 16 iterations -- oscilliatory solution
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# Chi-squared of fit: 8.30 DOF: 31 RMS: 0.12
# Min/Max residuals: -0.24 0.19
# Exact a, adot, b, bdot, g, gdot:
1.232678E-05 1.886909E-02 1.464680E-07 -2.362504E-04 2.349089E-02 1.367989E-02
# Covariance matrix:
2.4884E-10 3.6916E-07 -1.0139E-13 2.9311E-11 5.8485E-08 -3.1302E-07
3.6916E-07 5.4814E-04 -1.5057E-10 4.3531E-08 8.6838E-05 -4.6625E-04
-1.0139E-13 -1.5057E-10 1.9772E-13 -8.5565E-12 -2.3853E-11 1.2945E-10
2.9311E-11 4.3531E-08 -8.5565E-12 6.3267E-10 6.8960E-09 -3.7507E-08
5.8485E-08 8.6838E-05 -2.3853E-11 6.8960E-09 1.3757E-05 -7.3820E-05
-3.1302E-07 -4.6625E-04 1.2945E-10 -3.7507E-08 -7.3820E-05 4.6775E-04
# lat0 lon0 xBary yBary zBary JD0
0.221630 -179.302612 0.057959 0.003960 -0.990451 2457099.974968
# Heliocentric elements and errors
Epoch: 2457090.5000 = 2015/03/09
Mean Anomaly: 47.61998 +/- 50.095
Argument of Peri: 44.38921 +/- 87.085
Long of Asc Node: 17.61076 +/- 19.824
Inclination: 0.74126 +/- 0.842
Eccentricity: 0.59039332 +/- 1.0406
Semi-Major Axis: 47.96137584 +/- 24.4185
Time of Perihelion: 2441042.4391 +/- 11610.6
Perihelion: 19.64529980 +/- 50.9017
Aphelion: 76.27745187 +/- 63.2384
Period (y) 332.1587 +/- 253.67
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -43.56043847 +/- 6.7209
Ecliptic Y -0.47232110 +/- 0.0812
Ecliptic Z 0.16468855 +/- 0.0260
Ecliptic XDOT -0.00157101 +/- 0.0028
Ecliptic YDOT -0.00222420 +/- 0.0024
Ecliptic ZDOT -0.00002128 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.56331036 +/- 6.7205
Geocenter to KBO 42.56970145 +/- 6.7215
# Hcoef: 7.62
The following table shows the complete astrometric record for 15FG490. 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 (15FG490) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.47419 12 02 54.72 -00 04 26.6 24.4r 15FG490 T09 C~8eRh 2015 03 18.50997 12 02 54.55 -00 04 25.4 24.1r 15FG490 T09 C~8eRh 2015 03 18.53616 12 02 54.44 -00 04 24.6 24.2r 15FG490 T09 C~8eRh 2015 03 18.57737 12 02 54.26 -00 04 23.6 24.1r 15FG490 T09 C~8eRh 2015 03 20.41961 12 02 46.05 -00 03 30.2 23.3i 15FG490 T09 C~8eRh 2015 03 20.46343 12 02 45.82 -00 03 29.0 23.4i 15FG490 T09 C~8eRh 2015 03 20.49142 12 02 45.70 -00 03 28.3 23.7i 15FG490 T09 C~8eRh 2015 03 22.49071 12 02 36.79 -00 02 30.4 23.3i 15FG490 T09 C~8eRh 2015 03 22.51294 12 02 36.67 -00 02 29.9 23.3i 15FG490 T09 C~8eRh 2015 03 22.52660 12 02 36.60 -00 02 29.4 23.4i 15FG490 T09 C~8eRh 2015 03 25.51323 12 02 23.28 -00 01 03.2 25.0g 15FG490 T09 C~8eRh 2015 03 25.54330 12 02 23.15 -00 01 02.4 25.0g 15FG490 T09 C~8eRh 2015 03 25.55400 12 02 23.10 -00 01 01.8 24.9g 15FG490 T09 C~8eRh 2015 03 29.28823 12 02 06.55 +00 00 45.0 23.1y 15FG490 T09 C~8eRh 2015 03 29.31534 12 02 06.41 +00 00 45.9 23.3y 15FG490 T09 C~8eRh 2015 03 29.33991 12 02 06.30 +00 00 46.7 23.5y 15FG490 T09 C~8eRh 2015 03 29.35626 12 02 06.24 +00 00 47.1 23.2y 15FG490 T09 C~8eRh 2015 03 29.35897 12 02 06.24 +00 00 47.2 23.7y 15FG490 T09 C~8eRh
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 -0.06
2 0.0001 -2.82 -0.09 0.09 0.04
3 0.0002 -4.65 0.01 0.16 0.14
4 0.0003 -7.52 0.17 0.01 0.00
5 0.0053 -141.75 0.15 0.02 0.17
6 0.0054 -145.40 -0.24 -0.25 -0.08
7 0.0055 -147.33 -0.10 -0.33 -0.13
8 0.0110 -292.98 0.19 -0.36 0.09
9 0.0111 -294.83 -0.01 -0.62 -0.15
10 0.0111 -295.99 -0.16 -0.58 -0.10
11 0.0193 -513.59 -0.04 -0.96 -0.05
12 0.0194 -515.70 0.07 -1.00 -0.08
13 0.0194 -516.63 -0.07 -0.75 0.18
14 0.0296 -786.88 0.16 -1.50 -0.08
15 0.0297 -789.16 -0.14 -1.51 -0.07
16 0.0297 -790.99 -0.18 -1.43 0.02
17 0.0298 -791.98 0.03 -1.43 0.04
18 0.0298 -792.02 0.19 -1.33 0.13
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.
15FG490 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