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: 15FY490
# Created Sun Feb 23 02:10:20 2025
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 17
# Arc: 10.83d
# First observation: 2015/03/18
# Last observation: 2015/03/29
Preliminary a, adot, b, bdot, g, gdot:
0.000001 0.042774 -0.000001 -0.006216 0.029088 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after 14 iterations -- oscilliatory solution
# Chi-squared of fit: 9.24 DOF: 29 RMS: 0.13
# Min/Max residuals: -0.31 0.20
# Exact a, adot, b, bdot, g, gdot:
1.572767E-05 2.432729E-02 -4.572539E-06 -6.222435E-03 2.616514E-02 1.017840E-02
# Covariance matrix:
2.2496E-10 3.7514E-07 -8.8016E-13 1.7341E-10 5.9298E-08 -5.1231E-07
3.7514E-07 6.2627E-04 -1.4708E-09 2.9015E-07 9.8989E-05 -8.5895E-04
-8.8016E-13 -1.4708E-09 2.0968E-13 -9.6982E-12 -2.3243E-10 2.0917E-09
1.7341E-10 2.9015E-07 -9.6982E-12 8.1713E-10 4.5841E-08 -4.3054E-07
5.9298E-08 9.8989E-05 -2.3243E-10 4.5841E-08 1.5647E-05 -1.3565E-04
-5.1231E-07 -8.5895E-04 2.0917E-09 -4.3054E-07 -1.3565E-04 1.3614E-03
# lat0 lon0 xBary yBary zBary JD0
0.566933 -179.672033 0.051262 0.009930 -0.990782 2457099.992668
# Heliocentric elements and errors
Epoch: 2457090.5000 = 2015/03/09
Mean Anomaly: 57.93526 +/- 53.994
Argument of Peri: 75.56793 +/- 164.269
Long of Asc Node: 2.41888 +/- 2.199
Inclination: 14.31185 +/- 14.047
Eccentricity: 0.38048310 +/- 1.4121
Semi-Major Axis: 42.16458313 +/- 19.1507
Time of Perihelion: 2440996.6251 +/- 10235.0
Perihelion: 26.12167178 +/- 60.7097
Aphelion: 58.20749449 +/- 65.1447
Period (y) 273.7978 +/- 186.53
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.21052286 +/- 5.7774
Ecliptic Y -0.17333358 +/- 0.0326
Ecliptic Z 0.37800584 +/- 0.0571
Ecliptic XDOT -0.00106026 +/- 0.0040
Ecliptic YDOT -0.00255740 +/- 0.0022
Ecliptic ZDOT -0.00064044 +/- 0.0001
# Distances at JD0 (AU)
Heliocenter to KBO 39.21272799 +/- 5.7771
Geocenter to KBO 38.21878833 +/- 5.7778
# Hcoef: 8.68
The following table shows the complete astrometric record for 15FY490. 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 (15FY490) followed by the observatory code and reference code for the source of the astrometry.
2015 03 18.49189 12 02 06.34 +00 23 22.9 24.8r 15FY490 T09 C~8eRi 2015 03 18.50997 12 02 06.25 +00 23 23.2 24.7r 15FY490 T09 C~8eRi 2015 03 18.53616 12 02 06.13 +00 23 23.9 24.7r 15FY490 T09 C~8eRi 2015 03 18.57737 12 02 05.93 +00 23 25.0 24.6r 15FY490 T09 C~8eRi 2015 03 20.44069 12 01 56.70 +00 24 18.0 23.9i 15FY490 T09 C~8eRi 2015 03 20.46343 12 01 56.60 +00 24 18.6 24.1i 15FY490 T09 C~8eRi 2015 03 20.49965 12 01 56.42 +00 24 19.8 24.1i 15FY490 T09 C~8eRi 2015 03 20.50240 12 01 56.40 +00 24 19.6 24.0i 15FY490 T09 C~8eRi 2015 03 25.45464 12 01 31.87 +00 26 40.1 25.7g 15FY490 T09 C~8eRi 2015 03 25.46918 12 01 31.82 +00 26 40.4 25.2g 15FY490 T09 C~8eRi 2015 03 25.51323 12 01 31.60 +00 26 41.7 25.3g 15FY490 T09 C~8eRi 2015 03 25.55185 12 01 31.40 +00 26 42.9 25.8g 15FY490 T09 C~8eRi 2015 03 25.55400 12 01 31.40 +00 26 42.7 25.7g 15FY490 T09 C~8eRi 2015 03 29.26281 12 01 13.19 +00 28 27.1 23.6y 15FY490 T09 C~8eRi 2015 03 29.27997 12 01 13.10 +00 28 27.6 23.5y 15FY490 T09 C~8eRi 2015 03 29.29907 12 01 13.00 +00 28 27.9 23.9y 15FY490 T09 C~8eRi 2015 03 29.32074 12 01 12.87 +00 28 28.6 23.1y 15FY490 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 -0.21 0.00 0.17
2 0.0000 -1.36 -0.11 -0.26 -0.02
3 0.0001 -3.29 0.06 -0.34 0.01
4 0.0002 -6.48 0.18 -0.52 -0.02
5 0.0053 -154.58 -0.11 -6.96 -0.05
6 0.0054 -156.20 0.11 -7.01 -0.01
7 0.0055 -159.15 0.07 -6.98 0.16
8 0.0055 -159.35 0.10 -7.29 -0.13
9 0.0191 -552.81 -0.31 -24.73 -0.12
10 0.0191 -553.62 0.05 -24.76 -0.08
11 0.0192 -557.17 0.04 -24.88 -0.03
12 0.0193 -560.40 -0.09 -24.97 0.04
13 0.0193 -560.32 0.16 -25.15 -0.14
14 0.0295 -852.45 0.15 -38.01 0.20
15 0.0295 -853.89 0.07 -38.09 0.19
16 0.0296 -855.38 0.09 -38.41 -0.06
17 0.0296 -857.45 -0.25 -38.54 -0.10
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.
15FY490 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