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: 18VP137 # Created Mon Apr 28 01:11:11 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 1.06y # First observation: 2018/11/08 # Last observation: 2019/11/30 Preliminary a, adot, b, bdot, g, gdot: -0.000000 0.011705 0.000000 -0.001773 0.016652 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 1.78 DOF: 11 RMS: 0.08 # Min/Max residuals: -0.17 0.11 # Exact a, adot, b, bdot, g, gdot: 1.077716E-05 1.169713E-02 -1.946022E-06 -1.766575E-03 1.669925E-02 -5.393909E-03 # Covariance matrix: 7.4162E-13 2.1271E-12 1.2828E-14 -5.8148E-13 2.2529E-12 3.1528E-10 2.1271E-12 1.3405E-09 1.3530E-11 -3.3073E-10 4.6699E-10 1.7926E-07 1.2828E-14 1.3530E-11 4.6374E-13 -3.6727E-12 4.6750E-12 1.8106E-09 -5.8148E-13 -3.3073E-10 -3.6727E-12 8.2415E-11 -1.1519E-10 -4.4252E-08 2.2529E-12 4.6699E-10 4.6750E-12 -1.1519E-10 1.6752E-10 6.2436E-08 3.1528E-10 1.7926E-07 1.8106E-09 -4.4252E-08 6.2436E-08 2.3985E-05 # lat0 lon0 xBary yBary zBary JD0 -3.326733 38.092156 -0.135191 -0.057162 -0.984983 2458430.817951 # Heliocentric elements and errors Epoch: 2458430.5000 = 2018/11/08 Mean Anomaly: 283.60241 +/- 59.487 Argument of Peri: 324.41419 +/- 23.827 Long of Asc Node: 197.47735 +/- 0.105 Inclination: 9.17497 +/- 0.043 Eccentricity: 0.41768421 +/- 0.2677 Semi-Major Axis: 56.76035824 +/- 15.2777 Time of Perihelion: 2491577.4284 +/- 22069.2 Perihelion: 33.05245276 +/- 17.6060 Aphelion: 80.46826372 +/- 26.4563 Period (y) 427.6376 +/- 172.66 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 47.74264382 +/- 0.0365 Ecliptic Y 37.58947854 +/- 0.0286 Ecliptic Z -3.47513666 +/- 0.0027 Ecliptic XDOT -0.00188351 +/- 0.0006 Ecliptic YDOT 0.00095191 +/- 0.0005 Ecliptic ZDOT -0.00023802 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 60.86382760 +/- 0.0336 Geocenter to KBO 59.88291809 +/- 0.0464 # Hcoef: 7.60
The following table shows the complete astrometric record for 18VP137. 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 (18VP137) followed by the observatory code and reference code for the source of the astrometry.
2018 11 08.31715 02 27 16.218 +11 03 16.71 25.1r 18VP137 568 C~4ZZR 2018 11 08.47653 02 27 15.667 +11 03 13.74 25.2r 18VP137 568 C~4ZZR 2018 12 10.08045 02 25 39.219 +10 55 28.67 25.4r 18VP137 304 C~4ZZR 2018 12 10.13564 02 25 39.072 +10 55 28.11 25.4r 18VP137 304 C~4ZZR 2018 12 11.11465 02 25 36.598 +10 55 17.13 25.4r 18VP137 304 C~4ZZR 2019 11 29.11281 02 28 53.295 +11 04 53.27 25.5r 18VP137 304 C~4ZZR 2019 11 29.20387 02 28 53.005 +11 04 51.80 25.4r 18VP137 304 C~4ZZR 2019 11 30.11862 02 28 50.290 +11 04 39.30 25.4r 18VP137 304 C~4ZZR
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 0.06 0.00 0.06
2 0.0004 -8.64 -0.06 -0.23 -0.14
3 0.0870 -1503.00 0.06 13.02 -0.04
4 0.0871 -1505.23 0.03 13.18 0.05
5 0.0898 -1543.27 -0.09 14.45 0.08
6 1.0563 1385.49 0.06 -363.39 0.02
7 1.0565 1380.97 -0.17 -363.43 -0.10
8 1.0590 1339.10 0.11 -362.58 0.07
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.
18VP137 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0