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: 18FY73
# Created Sun Dec 22 02:11:02 2024
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 21
# Arc: 2.97y
# First observation: 2016/03/17
# Last observation: 2019/03/08
Preliminary a, adot, b, bdot, g, gdot:
-0.000025 0.033639 -0.000014 0.002404 0.029685 0.000000
# Chi-squared of fit: 7.75 DOF: 36 RMS: 0.11
# Min/Max residuals: -0.24 0.25
# Exact a, adot, b, bdot, g, gdot:
1.759191E-05 3.366916E-02 1.189660E-06 2.401696E-03 2.935476E-02 3.695762E-04
# Covariance matrix:
7.3246E-13 -5.9858E-13 1.1467E-14 -2.5738E-14 -2.3671E-13 -3.4477E-12
-5.9858E-13 1.3870E-12 -4.2393E-14 9.6302E-14 1.5239E-12 1.2885E-11
1.1467E-14 -4.2393E-14 5.6709E-13 -2.3295E-13 -5.2934E-14 -4.2981E-13
-2.5738E-14 9.6302E-14 -2.3295E-13 1.1381E-13 1.2129E-13 9.7773E-13
-2.3671E-13 1.5239E-12 -5.2934E-14 1.2129E-13 2.4891E-12 1.6215E-11
-3.4477E-12 1.2885E-11 -4.2981E-13 9.7773E-13 1.6215E-11 1.3080E-10
# lat0 lon0 xBary yBary zBary JD0
0.299014 170.429019 -0.111906 0.005287 -0.985178 2457464.925037
# Heliocentric elements and errors
Epoch: 2457460.5000 = 2016/03/13
Mean Anomaly: 3.54252 +/- 0.088
Argument of Peri: 358.88571 +/- 0.129
Long of Asc Node: 166.53967 +/- 0.001
Inclination: 4.08114 +/- 0.001
Eccentricity: 0.17990728 +/- 0.0001
Semi-Major Axis: 42.71806535 +/- 0.0085
Time of Perihelion: 2456456.9820 +/- 24.8
Perihelion: 35.03277458 +/- 0.0084
Aphelion: 50.40335612 +/- 0.0111
Period (y) 279.2065 +/- 0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -34.58533638 +/- 0.0018
Ecliptic Y 5.71499265 +/- 0.0003
Ecliptic Z 0.17783952 +/- 0.0000
Ecliptic XDOT -0.00055500 +/- 0.0000
Ecliptic YDOT -0.00309798 +/- 0.0000
Ecliptic ZDOT 0.00022419 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 35.05478940 +/- 0.0018
Geocenter to KBO 34.06602469 +/- 0.0018
# Hcoef: 7.58
The following table shows the complete astrometric record for 18FY73. 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 (18FY73) followed by the observatory code and reference code for the source of the astrometry.
2016 03 17.424248 11 25 17.70 +04 04 01.7 18FY73 T09 C~89VN 2016 03 17.566829 11 25 16.93 +04 04 06.6 18FY73 T09 C~89VN 2018 03 10.454806 11 40 35.66 +02 43 15.6 18FY73 T09 C~89VN 2018 03 18.45971 11 39 53.98 +02 47 57.0 23.2i 18FY73 T09 C~89VN 2018 03 18.48956 11 39 53.82 +02 47 58.2 23.0i 18FY73 T09 C~89VN 2018 03 18.50304 11 39 53.75 +02 47 58.5 22.8i 18FY73 T09 C~89VN 2018 03 18.56001 11 39 53.45 +02 48 00.4 22.6i 18FY73 T09 C~89VN 2018 04 22.298971 11 37 10.17 +03 06 12.7 18FY73 T09 C~89VN 2018 04 22.407617 11 37 09.74 +03 06 15.6 18FY73 T09 C~89VN 2018 04 24.35200 11 37 02.43 +03 07 04.4 23.0z 18FY73 T09 C~89VN 2018 04 24.39881 11 37 02.24 +03 07 05.4 22.9z 18FY73 T09 C~89VN 2018 04 24.42918 11 37 02.13 +03 07 06.2 22.4z 18FY73 T09 C~89VN 2018 04 24.44256 11 37 02.09 +03 07 06.2 22.7z 18FY73 T09 C~89VN 2018 04 24.48536 11 37 01.93 +03 07 07.6 22.4z 18FY73 T09 C~89VN 2019 02 05.457878 11 50 23.90 +01 47 27.7 18FY73 T09 C~89VN 2019 02 05.498105 11 50 23.75 +01 47 28.8 18FY73 T09 C~89VN 2019 03 02.51613 11 48 34.35 +02 00 11.5 23.0y 18FY73 T09 C~8CPH 2019 03 02.55921 11 48 34.13 +02 00 12.8 22.9y 18FY73 T09 C~8CPH 2019 03 02.60017 11 48 33.93 +02 00 14.5 22.5y 18FY73 T09 C~8CPH 2019 03 08.391723 11 48 04.73 +02 03 34.2 18FY73 T09 C~89VN 2019 03 08.433927 11 48 04.51 +02 03 35.7 18FY73 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 0.11 0.00 0.02
2 0.0004 -12.52 -0.11 -0.03 -0.11
3 1.9795 14565.48 -0.02 981.52 0.13
4 2.0015 13877.35 -0.02 991.93 0.07
5 2.0015 13874.66 -0.10 992.08 0.20
6 2.0016 13873.57 -0.01 991.94 0.05
7 2.0017 13868.67 0.04 991.90 -0.03
8 2.0969 11180.17 0.25 1024.59 -0.08
9 2.0971 11173.08 0.15 1024.70 0.02
10 2.1025 11052.87 -0.07 1026.11 0.13
11 2.1026 11049.85 -0.19 1025.90 -0.08
12 2.1027 11048.02 -0.15 1025.98 -0.00
13 2.1027 11047.47 0.12 1025.74 -0.24
14 2.1028 11044.71 -0.01 1026.08 0.09
15 2.8885 24070.90 0.10 1420.44 -0.03
16 2.8886 24068.37 0.05 1420.55 0.02
17 2.9571 22237.37 -0.11 1466.52 -0.06
18 2.9572 22233.79 -0.07 1466.39 -0.22
19 2.9574 22230.32 -0.10 1466.76 0.10
20 2.9732 21743.80 0.07 1475.54 0.00
21 2.9733 21740.14 0.06 1475.60 0.03
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.
18FY73 quality flag:3 Type: 5:3EE 5:3EE 5:3EE axisobj 42.325 42.344 42.305 ecceobj 0.172 0.172 0.171 incobj 4.098 4.098 4.098 qmin 34.346 34.231 34.249 qmax 50.886 51.134 50.803 amean 42.328 42.328 42.328 amin 41.889 41.867 41.901 amax 42.812 42.851 42.810 emean 0.172 0.173 0.172 emin 0.155 0.155 0.156 emax 0.189 0.194 0.188 imean 3.911 3.969 3.872 imin 3.282 3.249 3.335 imax 4.820 4.799 4.548 excite_mean 0.185 0.186 0.185 fracstop 1.000 1.000 1.000 cjmean 3.042 3.041 3.042 libcent 0 181.1 179.1 180.8 libamp 0 82.2 93.5 72.9 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 158.1 198.7 192.2 kozaiamp 180.0 179.9 180.0