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: 18VM35 # Created Sun Apr 27 01:11:10 2025 # Orbit generated from Bernstein formalism # Fitting 15 observations of 15 # Arc: 2.11y # First observation: 2018/11/06 # Last observation: 2020/12/17 Preliminary a, adot, b, bdot, g, gdot: -0.000055 0.019089 0.000004 -0.001049 0.018238 0.000000 # Chi-squared of fit: 7.89 DOF: 24 RMS: 0.13 # Min/Max residuals: -0.30 0.22 # Exact a, adot, b, bdot, g, gdot: 1.633530E-05 1.883700E-02 -2.490559E-07 -1.021703E-03 1.827517E-02 -8.610035E-03 # Covariance matrix: 3.6655E-13 -2.3014E-13 -5.3854E-15 1.5185E-14 2.1405E-13 -4.0052E-12 -2.3014E-13 1.4058E-12 1.9901E-14 -1.1073E-13 4.0747E-13 4.5307E-11 -5.3854E-15 1.9901E-14 1.8300E-13 -1.2948E-13 1.4153E-15 7.4527E-13 1.5185E-14 -1.1073E-13 -1.2948E-13 1.9989E-13 -2.8818E-14 -4.1312E-12 2.1405E-13 4.0747E-13 1.4153E-15 -2.8818E-14 4.8855E-13 1.4920E-11 -4.0052E-12 4.5307E-11 7.4527E-13 -4.1312E-12 1.4920E-11 1.6880E-09 # lat0 lon0 xBary yBary zBary JD0 -7.989004 81.110934 0.598510 -0.110560 -0.788540 2458429.099361 # Heliocentric elements and errors Epoch: 2458420.5000 = 2018/10/29 Mean Anomaly: 356.98357 +/- 0.067 Argument of Peri: 303.87606 +/- 0.135 Long of Asc Node: 192.49367 +/- 0.009 Inclination: 8.48560 +/- 0.000 Eccentricity: 0.84179844 +/- 0.0026 Semi-Major Axis: 280.93359135 +/- 4.1565 Time of Perihelion: 2472831.5123 +/- 8.0 Perihelion: 44.44413362 +/- 0.9774 Aphelion: 517.42304908 +/- 7.6896 Period (y) 4708.8376 +/- 104.50 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 9.08703336 +/- 0.0003 Ecliptic Y 54.22419498 +/- 0.0020 Ecliptic Z -7.60507242 +/- 0.0003 Ecliptic XDOT -0.00298115 +/- 0.0000 Ecliptic YDOT -0.00084938 +/- 0.0000 Ecliptic ZDOT 0.00002750 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 55.50382530 +/- 0.0020 Geocenter to KBO 54.71905259 +/- 0.0021 # Hcoef: 7.67
The following table shows the complete astrometric record for 18VM35. 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 (18VM35) followed by the observatory code and reference code for the source of the astrometry.
2018 11 06.59856 05 23 30.592 +15 10 09.25 25.0r 18VM35 568 C~2ygZ 2018 11 07.63604 05 23 27.595 +15 10 00.66 18VM35 568 C~2ygZ 2018 11 08.59628 05 23 24.763 +15 09 52.40 18VM35 568 C~2ygZ 2018 12 09.26032 05 21 37.650 +15 06 22.59 18VM35 304 C~2ygZ 2018 12 10.25364 05 21 33.856 +15 06 17.70 25.0r 18VM35 304 C~2ygZ 2019 02 02.11690 05 18 38.339 +15 06 09.57 25.1r 18VM35 304 C~2ygZ 2019 02 03.09285 05 18 36.344 +15 06 14.03 25.1r 18VM35 304 C~2ygZ 2019 02 28.04314 05 18 07.666 +15 08 53.08 25.0r 18VM35 304 C~3d16 2019 03 01.04116 05 18 07.482 +15 09 01.30 25.1r 18VM35 304 C~3d16 2019 11 29.24687 05 26 46.782 +15 07 50.43 24.9r 18VM35 304 C~3d16 2019 11 30.23062 05 26 43.168 +15 07 44.93 25.0r 18VM35 304 C~3d16 2019 12 28.13858 05 24 56.970 +15 05 58.05 18VM35 304 C~3qUU 2019 12 28.18194 05 24 56.813 +15 05 57.71 18VM35 304 C~3qUU 2020 12 16.23223 05 30 14.532 +15 06 41.32 25.0r 18VM35 304 C~5ZeM 2020 12 17.22825 05 30 10.660 +15 06 38.41 25.0r 18VM35 304 C~5ZeM
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 -0.01 0.00 -0.13
2 0.0028 -43.85 0.17 -5.81 0.20
3 0.0055 -85.29 0.08 -11.44 0.13
4 0.0894 -1646.62 -0.05 -120.29 0.04
5 0.0921 -1701.77 -0.13 -121.55 -0.11
6 0.2396 -4238.88 0.04 42.08 -0.10
7 0.2423 -4267.41 0.09 48.53 -0.06
8 0.3106 -4670.80 -0.16 236.11 -0.12
9 0.3133 -4672.88 0.01 244.50 0.12
10 1.0613 2826.73 -0.30 -314.19 -0.18
11 1.0640 2774.16 -0.08 -316.54 0.22
12 1.1404 1232.48 0.10 -329.33 0.13
13 1.1405 1230.19 0.18 -329.53 -0.15
14 2.1099 5827.40 0.05 -557.77 -0.07
15 2.1126 5771.21 -0.00 -557.53 0.08
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.
18VM35 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 299.985 313.579 287.695 ecceobj 0.851 0.858 0.844 incobj 8.459 8.458 8.459 qmin 41.738 41.428 41.991 qmax 584.586 608.140 555.410 amean 289.480 300.004 277.642 amin 276.198 286.914 265.597 amax 314.598 326.269 300.074 emean 0.846 0.852 0.839 emin 0.835 0.841 0.828 emax 0.858 0.864 0.851 imean 8.623 8.613 8.482 imin 8.361 8.353 8.299 imax 9.030 8.969 8.651 excite_mean 0.859 0.865 0.851 fracstop 1.000 1.000 1.000 cjmean 3.375 3.370 3.380 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 317.5 317.2 309.9 kozaiamp 15.7 14.4 8.3