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: 18FX73
# Created Tue Apr 1 01:11:09 2025
# Orbit generated from Bernstein formalism
# Fitting 19 observations of 19
# Arc: 1.00y
# First observation: 2018/03/10
# Last observation: 2019/03/11
Preliminary a, adot, b, bdot, g, gdot:
-0.000034 0.019919 -0.000000 0.000545 0.021985 0.000000
# Chi-squared of fit: 5.50 DOF: 32 RMS: 0.10
# Min/Max residuals: -0.26 0.29
# Exact a, adot, b, bdot, g, gdot:
1.422155E-05 1.991936E-02 6.681067E-07 5.460489E-04 2.211992E-02 5.247180E-04
# Covariance matrix:
4.4524E-13 1.1567E-12 1.2501E-15 3.7503E-14 1.0636E-12 7.7860E-11
1.1567E-12 2.8560E-11 -1.4296E-14 6.3355E-13 1.0112E-11 1.3225E-09
1.2501E-15 -1.4296E-14 1.3525E-13 -1.6250E-13 -5.8382E-16 -5.5048E-13
3.7503E-14 6.3355E-13 -1.6250E-13 4.7173E-13 2.4642E-13 3.0309E-11
1.0636E-12 1.0112E-11 -5.8382E-16 2.4642E-13 5.0373E-12 5.1337E-10
7.7860E-11 1.3225E-09 -5.5048E-13 3.0309E-11 5.1337E-10 6.3238E-08
# lat0 lon0 xBary yBary zBary JD0
2.807525 176.722301 0.129830 0.048323 -0.983317 2458187.979457
# Heliocentric elements and errors
Epoch: 2458180.5000 = 2018/03/03
Mean Anomaly: 154.62571 +/- 12.526
Argument of Peri: 263.09721 +/- 12.507
Long of Asc Node: 116.48904 +/- 0.032
Inclination: 3.16937 +/- 0.001
Eccentricity: 0.05113535 +/- 0.0044
Semi-Major Axis: 44.13338263 +/- 0.0317
Time of Perihelion: 2412183.6127 +/- 3725.8
Perihelion: 41.87660660 +/- 0.1969
Aphelion: 46.39015867 +/- 0.1974
Period (y) 293.1967 +/- 0.32
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -46.05687242 +/- 0.0046
Ecliptic Y 2.76049926 +/- 0.0003
Ecliptic Z 2.21437553 +/- 0.0002
Ecliptic XDOT -0.00019611 +/- 0.0000
Ecliptic YDOT -0.00246246 +/- 0.0000
Ecliptic ZDOT 0.00007054 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 46.19263267 +/- 0.0046
Geocenter to KBO 45.20811006 +/- 0.0046
# Hcoef: 6.96
The following table shows the complete astrometric record for 18FX73. 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 (18FX73) followed by the observatory code and reference code for the source of the astrometry.
2018 03 10.478656 11 52 26.32 +03 52 45.5 18FX73 T09 C~89VM 2018 03 18.48012 11 51 53.35 +03 56 24.7 23.2i 18FX73 T09 C~89VM 2018 03 18.48350 11 51 53.34 +03 56 24.7 23.3i 18FX73 T09 C~89VN 2018 03 18.51105 11 51 53.23 +03 56 25.4 23.3i 18FX73 T09 C~89VN 2018 03 18.55199 11 51 53.06 +03 56 26.2 23.6i 18FX73 T09 C~89VN 2018 04 12.121854 11 50 15.077 +04 06 48.85 24.4V 18FX73 W84 C~8HOT 2018 04 13.119460 11 50 11.407 +04 07 11.21 24.5V 18FX73 W84 C~8HOT 2018 04 24.37585 11 49 32.83 +04 11 00.8 23.2z 18FX73 T09 C~89VN 2018 04 24.40415 11 49 32.74 +04 11 01.3 23.1z 18FX73 T09 C~89VN 2018 04 24.41756 11 49 32.70 +04 11 01.7 23.2z 18FX73 T09 C~89VN 2018 04 24.45059 11 49 32.60 +04 11 02.2 22.9z 18FX73 T09 C~89VN 2018 04 24.49874 11 49 32.43 +04 11 03.0 23.7z 18FX73 T09 C~89VN 2018 04 24.50141 11 49 32.45 +04 11 03.0 23.1z 18FX73 T09 C~89VN 2019 02 04.590836 11 58 41.86 +03 12 51.5 18FX73 T09 C~89VN 2019 02 05.527701 11 58 39.27 +03 13 11.4 18FX73 T09 C~89VN 2019 03 02.53771 11 57 13.88 +03 23 27.3 23.2y 18FX73 T09 C~8CPH 2019 03 02.57800 11 57 13.72 +03 23 28.5 23.1y 18FX73 T09 C~8CPH 2019 03 02.61624 11 57 13.57 +03 23 29.5 23.2y 18FX73 T09 C~8CPH 2019 03 11.491782 11 56 38.08 +03 27 31.5 18FX73 T09 C~89VN
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 0.00 0.00 -0.06
2 0.0219 -539.88 -0.16 4.74 0.08
3 0.0219 -540.02 -0.06 4.68 0.02
4 0.0220 -541.81 0.04 4.67 0.02
5 0.0221 -544.46 0.19 4.39 -0.26
6 0.0894 -2137.35 -0.01 -7.32 0.00
7 0.0921 -2196.62 -0.01 -8.63 -0.01
8 0.1229 -2817.56 -0.09 -27.25 -0.00
9 0.1230 -2819.00 -0.06 -27.32 -0.01
10 0.1230 -2819.71 -0.07 -27.19 0.15
11 0.1231 -2821.28 0.06 -27.33 0.10
12 0.1233 -2823.93 -0.12 -27.60 -0.07
13 0.1233 -2823.66 0.29 -27.48 0.05
14 0.9065 6112.36 -0.02 47.04 0.02
15 0.9091 6068.81 -0.04 49.78 0.03
16 0.9776 4649.55 0.09 103.69 -0.09
17 0.9777 4646.88 0.04 103.83 0.02
18 0.9778 4644.42 0.07 103.85 0.00
19 1.0021 4060.33 -0.13 113.61 -0.00
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.
18FX73 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.853 44.043 43.747 ecceobj 0.060 0.076 0.058 incobj 3.169 3.170 3.168 qmin 40.403 39.766 40.520 qmax 47.827 48.869 47.481 amean 44.007 44.185 43.908 amin 43.663 43.829 43.563 amax 44.369 44.574 44.266 emean 0.062 0.080 0.058 emin 0.046 0.064 0.042 emax 0.078 0.097 0.073 imean 1.991 2.034 1.993 imin 1.209 1.216 1.190 imax 2.688 2.749 2.697 excite_mean 0.072 0.088 0.068 fracstop 1.000 1.000 1.000 cjmean 3.095 3.094 3.095 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 174.8 178.1 177.8 kozaiamp 180.0 180.0 180.0