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: 17FQ161
# Created Fri Nov 22 02:10:53 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 15 observations of 15
# Arc: 6.08y
# First observation: 2017/03/26
# Last observation: 2023/04/24
# Chi-squared of fit: 41.14 DOF: 24 RMS: 0.29
# Min/Max residuals: -0.56 0.54
# Exact a, adot, b, bdot, g, gdot:
1.149669E-05 1.290769E-02 -4.320254E-06 -1.653160E-03 1.779925E-02 2.394084E-03
# Covariance matrix:
3.1989E-13 -3.2518E-13 -1.9276E-14 4.5477E-14 3.6773E-13 -4.3779E-12
-3.2518E-13 5.9174E-13 3.7859E-14 -8.7201E-14 -4.5312E-13 8.4050E-12
-1.9276E-14 3.7859E-14 1.6095E-13 -4.0012E-14 -3.0211E-14 5.5639E-13
4.5477E-14 -8.7201E-14 -4.0012E-14 3.3041E-14 8.0578E-14 -1.2898E-12
3.6773E-13 -4.5312E-13 -3.0211E-14 8.0578E-14 1.7569E-12 -7.7112E-12
-4.3779E-12 8.4050E-12 5.5639E-13 -1.2898E-12 -7.7112E-12 1.2428E-10
# lat0 lon0 xBary yBary zBary JD0
3.911644 -176.591907 -0.031072 0.067945 -0.991273 2457838.655271
# Heliocentric elements and errors
Epoch: 2457838.5000 = 2017/03/26
Mean Anomaly: 127.78339 +/- 0.188
Argument of Peri: 4.80052 +/- 0.149
Long of Asc Node: 31.19160 +/- 0.002
Inclination: 8.21057 +/- 0.001
Eccentricity: 0.26272420 +/- 0.0002
Semi-Major Axis: 47.85185381 +/- 0.0209
Time of Perihelion: 2414922.5735 +/- 69.0
Perihelion: 35.28001382 +/- 0.0193
Aphelion: 60.42369379 +/- 0.0288
Period (y) 331.0216 +/- 0.22
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -56.94524626 +/- 0.0042
Ecliptic Y -3.42732875 +/- 0.0002
Ecliptic Z 3.83238097 +/- 0.0003
Ecliptic XDOT -0.00026254 +/- 0.0000
Ecliptic YDOT -0.00201138 +/- 0.0000
Ecliptic ZDOT -0.00022865 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 57.17675423 +/- 0.0042
Geocenter to KBO 56.18207153 +/- 0.0042
# Hcoef: 6.12
The following table shows the complete astrometric record for 17FQ161. 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 (17FQ161) followed by the observatory code and reference code for the source of the astrometry.
2017 03 26.15447 12 18 43.502 +02 14 05.77 23.7r 17FQ161 807 C~2b81 2017 03 26.26397 12 18 43.117 +02 14 07.69 23.7r 17FQ161 807 C~2b81 2017 04 20.19005 12 17 20.234 +02 22 12.80 17FQ161 G37 C~2b81 2017 04 20.27151 12 17 19.985 +02 22 14.34 17FQ161 G37 C~2b81 2017 04 24.04811 12 17 08.599 +02 23 16.52 23.5r 17FQ161 304 C~2b81 2017 04 25.09221 12 17 05.550 +02 23 33.15 17FQ161 304 C~2b81 2018 03 11.21626 12 22 09.163 +01 45 45.87 23.6r 17FQ161 304 C~2b81 2018 03 11.28622 12 22 08.926 +01 45 47.40 17FQ161 304 C~2b81 2018 03 12.20193 12 22 05.891 +01 46 07.07 17FQ161 304 C~2b81 2018 03 12.27824 12 22 05.642 +01 46 09.02 17FQ161 304 C~2b81 2019 04 05.204040 12 23 17.887 +01 31 48.52 23.3G 17FQ161 G37 C~34cJ 2019 04 05.275270 12 23 17.618 +01 31 49.86 17FQ161 G37 C~34cJ 2023 04 24.147890 12 32 18.768 +00 08 03.74 23.5G 17FQ161 G37 C~6hX8 2023 04 24.209820 12 32 18.575 +00 08 04.88 17FQ161 G37 C~6hX8 2023 04 24.269970 12 32 18.383 +00 08 05.90 17FQ161 G37 C~6hX8
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 0.23 0.00 0.54
2 0.0003 0.00 0.22 0.00 0.13
3 0.0685 0.00 -0.11 0.00 0.06
4 0.0688 0.00 -0.02 0.00 0.22
5 0.0791 0.00 0.09 0.00 0.29
6 0.0820 0.00 0.46 0.00 0.49
7 0.9584 0.00 -0.08 0.00 -0.36
8 0.9586 0.00 -0.11 0.00 -0.34
9 0.9611 0.00 -0.22 0.00 -0.43
10 0.9613 0.00 -0.09 0.00 -0.13
11 2.0261 0.00 -0.21 0.00 -0.42
12 2.0263 0.00 -0.56 0.00 -0.52
13 6.0780 0.00 0.14 0.00 0.11
14 6.0782 0.00 0.14 0.00 0.20
15 6.0783 0.00 0.07 0.00 0.19
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.
17FQ161 quality flag:3 Type: 2:1E 2:1E 2:1E axisobj 47.500 47.501 47.500 ecceobj 0.272 0.272 0.272 incobj 8.260 8.260 8.260 qmin 33.618 33.590 33.648 qmax 62.898 62.822 62.836 amean 47.797 47.797 47.797 amin 47.169 47.205 47.212 amax 48.543 48.488 48.536 emean 0.273 0.275 0.270 emin 0.248 0.251 0.242 emax 0.298 0.297 0.296 imean 6.931 6.698 7.246 imin 5.338 5.199 5.462 imax 8.564 8.063 8.963 excite_mean 0.299 0.299 0.299 fracstop 1.000 1.000 1.000 cjmean 3.036 3.036 3.036 libcent 0 275.3 276.4 275.3 libamp 0 45.8 44.9 46.1 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 266.4 265.3 264.5 kozaiamp 180.0 180.0 180.0