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: 15FT490
# Created Wed May 21 01:10:25 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 65.83d
# First observation: 2015/03/18
# Last observation: 2015/05/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000001 0.029962 -0.000000 0.000914 0.025031 0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit: 10.67 DOF: 31 RMS: 0.14
# Min/Max residuals: -0.24 0.30
# Exact a, adot, b, bdot, g, gdot:
1.443717E-05 2.240097E-02 1.243844E-06 8.555748E-04 2.383674E-02 7.100521E-03
# Covariance matrix:
8.0641E-13 1.0164E-09 -9.4921E-14 7.7478E-12 1.5596E-10 -1.1941E-08
1.0164E-09 1.7839E-06 -1.6551E-10 1.3489E-08 2.7079E-07 -2.1680E-05
-9.4921E-14 -1.6551E-10 1.3168E-13 -2.1016E-12 -2.5132E-11 2.0095E-09
7.7478E-12 1.3489E-08 -2.1016E-12 1.2307E-10 2.0485E-09 -1.6373E-07
1.5596E-10 2.7079E-07 -2.5132E-11 2.0485E-09 4.1127E-08 -3.2851E-06
-1.1941E-08 -2.1680E-05 2.0095E-09 -1.6373E-07 -3.2851E-06 2.6511E-04
# lat0 lon0 xBary yBary zBary JD0
0.894387 179.951315 0.044747 0.015598 -0.991025 2457099.992668
# Heliocentric elements and errors
Epoch: 2457090.5000 = 2015/03/09
Mean Anomaly: 60.75263 +/- 54.507
Argument of Peri: 285.62496 +/- 3.962
Long of Asc Node: 158.15002 +/- 1.061
Inclination: 2.35770 +/- 0.110
Eccentricity: 0.30757047 +/- 0.6961
Semi-Major Axis: 45.87460224 +/- 17.8663
Time of Perihelion: 2437938.2645 +/- 13041.7
Perihelion: 31.76492946 +/- 34.2439
Aphelion: 59.98427503 +/- 39.5645
Period (y) 310.7182 +/- 181.52
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.94114776 +/- 0.3569
Ecliptic Y 0.08106149 +/- 0.0003
Ecliptic Z 0.65491474 +/- 0.0056
Ecliptic XDOT -0.00081952 +/- 0.0019
Ecliptic YDOT -0.00257802 +/- 0.0001
Ecliptic ZDOT 0.00011108 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.94621817 +/- 0.3568
Geocenter to KBO 41.95204108 +/- 0.3569
# Hcoef: 8.08
The following table shows the complete astrometric record for 15FT490. 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 (15FT490) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.49189 12 01 14.67 +00 50 23.8 24.6r 15FT490 T09 C~8eRi 2015 03 18.50997 12 01 14.59 +00 50 24.3 25.0r 15FT490 T09 C~8eRi 2015 03 18.54922 12 01 14.41 +00 50 25.6 24.3r 15FT490 T09 C~8eRi 2015 03 18.57737 12 01 14.29 +00 50 26.3 24.3r 15FT490 T09 C~8eRi 2015 03 20.44069 12 01 06.08 +00 51 21.2 24.4i 15FT490 T09 C~8eRi 2015 03 20.47450 12 01 05.94 +00 51 22.1 24.4i 15FT490 T09 C~8eRi 2015 03 20.51900 12 01 05.74 +00 51 23.3 24.3i 15FT490 T09 C~8eRi 2015 03 20.55475 12 01 05.57 +00 51 24.4 23.7i 15FT490 T09 C~8eRi 2015 03 25.52597 12 00 43.69 +00 53 48.9 25.7g 15FT490 T09 C~8eRi 2015 03 25.55185 12 00 43.59 +00 53 49.7 25.5g 15FT490 T09 C~8eRi 2015 03 29.30183 12 00 27.19 +00 55 38.2 24.3y 15FT490 T09 C~8iai 2015 03 29.32074 12 00 27.10 +00 55 38.3 23.1y 15FT490 T09 C~8iai 2015 03 29.33991 12 00 27.03 +00 55 39.0 23.5y 15FT490 T09 C~8iai 2015 03 29.41284 12 00 26.71 +00 55 41.0 23.7y 15FT490 T09 C~8iai 2015 03 29.42373 12 00 26.65 +00 55 41.4 23.8y 15FT490 T09 C~8iai 2015 05 23.26835 11 57 26.95 +01 14 56.2 24.2z 15FT490 T09 C~8r6X 2015 05 23.28588 11 57 26.90 +01 14 56.0 23.7z 15FT490 T09 C~8r6X 2015 05 23.32089 11 57 26.85 +01 14 56.3 23.6z 15FT490 T09 C~8r6X
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 0.09 0.00 -0.14
2 0.0000 -1.30 0.11 -0.02 -0.16
3 0.0002 -4.29 -0.01 0.10 -0.05
4 0.0002 -6.22 0.11 0.03 -0.12
5 0.0053 -141.04 -0.24 1.41 0.20
6 0.0054 -143.32 -0.05 1.40 0.19
7 0.0055 -146.55 -0.01 1.31 0.10
8 0.0056 -149.33 -0.17 1.30 0.09
9 0.0193 -507.89 0.03 3.33 -0.14
10 0.0193 -509.58 0.22 3.47 -0.01
11 0.0296 -778.42 -0.16 5.18 0.25
12 0.0296 -779.70 -0.08 4.73 -0.19
13 0.0297 -780.94 0.07 4.96 0.04
14 0.0299 -786.14 0.15 4.88 -0.03
15 0.0299 -787.12 -0.05 4.89 -0.02
16 0.1801 -3719.50 0.04 -7.25 0.30
17 0.1801 -3720.11 -0.09 -7.73 -0.16
18 0.1802 -3720.92 0.05 -7.75 -0.15
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.
15FT490 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