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: 18VG18 # Created Sun Dec 22 02:11:03 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 34 observations of 34 # Arc: 16.15y # First observation: 2003/11/21 # Last observation: 2020/01/16 # Chi-squared of fit: 87.23 DOF: 62 RMS: 0.28 # Min/Max residuals: -1.07 0.72 # Exact a, adot, b, bdot, g, gdot: 2.459718E-06 2.957739E-03 -1.953161E-06 -1.328085E-03 8.238382E-03 6.930274E-04 # Covariance matrix: 1.0661E-12 -2.5921E-13 -1.3650E-13 9.1877E-14 -6.4208E-13 -4.1134E-12 -2.5921E-13 8.7370E-14 5.2110E-14 -3.4510E-14 2.1759E-13 1.5431E-12 -1.3650E-13 5.2110E-14 4.5327E-13 -4.9453E-14 1.1969E-13 9.6062E-13 9.1877E-14 -3.4510E-14 -4.9453E-14 1.6190E-14 -8.3352E-14 -6.3065E-13 -6.4208E-13 2.1759E-13 1.1969E-13 -8.3352E-14 6.9906E-13 3.7417E-12 -4.1134E-12 1.5431E-12 9.6062E-13 -6.3065E-13 3.7417E-12 2.8179E-11 # lat0 lon0 xBary yBary zBary JD0 -2.417041 70.747162 0.210748 -0.040600 -0.963415 2452964.969353 # Heliocentric elements and errors Epoch: 2452964.5000 = 2003/11/21 Mean Anomaly: 150.74469 +/- 0.081 Argument of Peri: 16.64645 +/- 0.082 Long of Asc Node: 245.31650 +/- 0.000 Inclination: 24.25160 +/- 0.001 Eccentricity: 0.52713305 +/- 0.0002 Semi-Major Axis: 81.69829975 +/- 0.0123 Time of Perihelion: 2340021.9817 +/- 65.6 Perihelion: 38.63242547 +/- 0.0162 Aphelion: 124.76417403 +/- 0.0241 Period (y) 738.4613 +/- 0.17 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 40.50231124 +/- 0.0040 Ecliptic Y 115.33651311 +/- 0.0116 Ecliptic Z -5.11931356 +/- 0.0005 Ecliptic XDOT -0.00086272 +/- 0.0000 Ecliptic YDOT 0.00051762 +/- 0.0000 Ecliptic ZDOT -0.00045052 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 122.34834668 +/- 0.0111 Geocenter to KBO 121.38294277 +/- 0.0123 # Hcoef: 3.66
The following table shows the complete astrometric record for 18VG18. 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 (18VG18) followed by the observatory code and reference code for the source of the astrometry.
2003 11 21.468610 04 38 05.30 +19 39 50.4 18VG18 568 C~5SHM 2005 09 04.625139 04 40 59.68 +19 38 29.1 18VG18 568 C~5SHM 2005 09 04.627934 04 40 59.70 +19 38 29.1 18VG18 568 C~5SHM 2005 09 04.630734 04 40 59.69 +19 38 29.1 18VG18 568 C~5SHM 2015 03 11.038746 04 44 09.32 +19 01 37.9 18VG18 W84 C~5SHM 2015 03 11.040808 04 44 09.30 +19 01 37.8 18VG18 W84 C~5SHM 2017 01 16.193342 04 46 07.80 +18 55 30.7 24.3r 18VG18 W84 C~3syX 2017 01 16.195407 04 46 07.78 +18 55 30.5 18VG18 W84 C~3syX 2018 11 10.55241 04 49 36.353 +18 53 10.69 24.6 18VG18 568 C~2rAY 2018 11 10.59845 04 49 36.262 +18 53 10.36 24.5 18VG18 568 C~2rAY 2018 12 03.18219 04 48 54.286 +18 51 31.50 24.5 18VG18 304 C~2rAY 2018 12 03.30293 04 48 54.073 +18 51 30.86 18VG18 304 C~2rAY 2018 12 04.12222 04 48 52.497 +18 51 27.87 18VG18 304 C~2rAY 2018 12 08.19843 04 48 44.574 +18 51 11.03 18VG18 304 C~2rAY 2018 12 08.22737 04 48 44.540 +18 51 11.23 18VG18 304 C~2rAY 2018 12 09.13542 04 48 42.782 +18 51 07.28 24.6r 18VG18 304 C~2rAY 2018 12 10.17341 04 48 40.755 +18 51 03.18 24.5r 18VG18 304 C~2rAY 2018 12 11.20760 04 48 38.762 +18 50 59.23 18VG18 304 C~2rAY 2018 12 12.21319 04 48 36.828 +18 50 55.30 24.6r 18VG18 304 C~2rAY 2019 01 06.21324 04 47 51.680 +18 49 32.90 24.3G 18VG18 568 C~3d11 2019 02 03.07019 04 47 15.664 +18 48 45.20 24.4r 18VG18 304 C~3d11 2019 03 01.05031 04 47 03.398 +18 48 48.81 24.5r 18VG18 304 C~3d11 2019 11 26.945423 04 49 50.663 +18 48 45.80 18VG18 950 C~3pOs 2019 11 26.948008 04 49 50.659 +18 48 45.91 24.3r 18VG18 950 C~3pOs 2019 11 26.950594 04 49 50.633 +18 48 45.66 24.3r 18VG18 950 C~3pOs 2019 11 27.068420 04 49 50.398 +18 48 44.79 25.1r 18VG18 950 C~3pOs 2019 11 27.071005 04 49 50.418 +18 48 45.11 24.6r 18VG18 950 C~3pOs 2019 11 29.22908 04 49 46.290 +18 48 35.64 24.3r 18VG18 304 C~3d11 2019 11 30.22140 04 49 44.382 +18 48 31.60 24.3r 18VG18 304 C~3d11 2020 01 15.825089 04 48 21.222 +18 45 59.34 24.7r 18VG18 950 C~3pOs 2020 01 15.828265 04 48 21.220 +18 45 58.99 24.7r 18VG18 950 C~3pOs 2020 01 16.001478 04 48 20.973 +18 45 58.65 18VG18 950 C~3pOs 2020 01 16.007455 04 48 20.954 +18 45 58.76 25.3r 18VG18 950 C~3pOs 2020 01 16.012182 04 48 20.959 +18 45 58.82 25.7r 18VG18 950 C~3pOs
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 0.72 0.00 -0.03
2 1.7882 0.00 -0.43 0.00 0.22
3 1.7883 0.00 -0.14 0.00 0.22
4 1.7883 0.00 -0.29 0.00 0.23
5 11.3007 0.00 0.16 0.00 -0.24
6 11.3007 0.00 -0.15 0.00 -0.34
7 13.1546 0.00 0.06 0.00 -0.87
8 13.1546 0.00 -0.19 0.00 -1.07
9 14.9708 0.00 0.17 0.00 0.07
10 14.9709 0.00 0.02 0.00 -0.05
11 15.0328 0.00 -0.10 0.00 -0.19
12 15.0331 0.00 0.25 0.00 -0.32
13 15.0353 0.00 0.31 0.00 0.09
14 15.0465 0.00 -0.12 0.00 -0.13
15 15.0466 0.00 0.22 0.00 0.19
16 15.0491 0.00 0.15 0.00 -0.13
17 15.0519 0.00 -0.15 0.00 -0.11
18 15.0547 0.00 -0.11 0.00 -0.00
19 15.0575 0.00 -0.07 0.00 -0.02
20 15.1259 0.00 -0.00 0.00 0.03
21 15.2022 0.00 0.14 0.00 0.13
22 15.2733 0.00 0.50 0.00 -0.04
23 16.0150 0.00 0.18 0.00 0.45
24 16.0150 0.00 0.20 0.00 0.57
25 16.0150 0.00 -0.12 0.00 0.33
26 16.0153 0.00 -0.23 0.00 -0.04
27 16.0153 0.00 0.15 0.00 0.29
28 16.0212 0.00 0.16 0.00 -0.03
29 16.0240 0.00 0.13 0.00 0.13
30 16.1516 0.00 -0.27 0.00 0.35
31 16.1516 0.00 -0.23 0.00 0.01
32 16.1520 0.00 -0.17 0.00 0.01
33 16.1521 0.00 -0.32 0.00 0.13
34 16.1521 0.00 -0.15 0.00 0.20
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.
18VG18 quality flag:3 Type: 9:2EEEEEEE9:2EEEEEEE9:2EEEEEEE axisobj 82.066 82.066 82.066 ecceobj 0.524 0.524 0.524 incobj 24.115 24.115 24.115 qmin 37.597 37.618 37.597 qmax 129.496 129.511 129.624 amean 82.068 82.068 82.068 amin 80.726 80.705 80.730 amax 83.987 83.998 84.026 emean 0.531 0.531 0.531 emin 0.520 0.520 0.521 emax 0.542 0.542 0.543 imean 25.604 25.595 25.565 imin 25.276 25.276 25.276 imax 25.904 25.859 25.796 excite_mean 0.684 0.684 0.684 fracstop 1.000 1.000 1.000 cjmean 2.890 2.890 2.890 libcent 0 182.4 180.7 182.2 libamp 0 156.1 153.2 153.1 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 92.6 91.5 91.6 kozaiamp 76.1 74.8 74.6