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: 18VJ137 # Created Tue Apr 1 01:11:09 2025 # Orbit generated from Bernstein formalism # Fitting 16 observations of 16 # Arc: 1.06y # First observation: 2018/11/08 # Last observation: 2019/11/30 Preliminary a, adot, b, bdot, g, gdot: -0.000037 0.010060 0.000003 -0.003258 0.014731 0.000000 # Chi-squared of fit: 9.15 DOF: 26 RMS: 0.13 # Min/Max residuals: -0.37 0.24 # Exact a, adot, b, bdot, g, gdot: 1.079757E-05 1.002968E-02 -3.307762E-06 -3.235644E-03 1.484644E-02 -6.930018E-03 # Covariance matrix: 7.0939E-13 1.9405E-12 6.0556E-14 -1.2440E-12 2.2059E-12 3.5271E-10 1.9405E-12 1.8289E-11 5.9323E-13 -1.0415E-11 1.1733E-11 2.9539E-09 6.0556E-14 5.9323E-13 1.4539E-13 -5.2091E-13 3.7241E-13 1.0056E-10 -1.2440E-12 -1.0415E-11 -5.2091E-13 7.0574E-12 -6.9707E-12 -1.7634E-09 2.2059E-12 1.1733E-11 3.7241E-13 -6.9707E-12 9.7755E-12 1.9767E-09 3.5271E-10 2.9539E-09 1.0056E-10 -1.7634E-09 1.9767E-09 5.0011E-07 # lat0 lon0 xBary yBary zBary JD0 -5.783009 48.282507 0.040896 -0.100163 -0.989964 2458430.852171 # Heliocentric elements and errors Epoch: 2458430.5000 = 2018/11/08 Mean Anomaly: 324.91825 +/- 5.684 Argument of Peri: 301.31752 +/- 1.264 Long of Asc Node: 211.15423 +/- 0.011 Inclination: 18.75856 +/- 0.011 Eccentricity: 0.58638580 +/- 0.0568 Semi-Major Axis: 90.07410030 +/- 9.1225 Time of Perihelion: 2488858.7606 +/- 1713.1 Perihelion: 37.25592658 +/- 6.3594 Aphelion: 142.89227402 +/- 15.3506 Period (y) 854.8858 +/- 129.87 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 45.28708223 +/- 0.0094 Ecliptic Y 50.72981677 +/- 0.0105 Ecliptic Z -6.78714669 +/- 0.0014 Ecliptic XDOT -0.00225907 +/- 0.0001 Ecliptic YDOT 0.00023450 +/- 0.0001 Ecliptic ZDOT -0.00046507 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 68.34105272 +/- 0.0100 Geocenter to KBO 67.35621169 +/- 0.0142 # Hcoef: 6.83
The following table shows the complete astrometric record for 18VJ137. 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 (18VJ137) followed by the observatory code and reference code for the source of the astrometry.
2018 11 08.35137 03 09 49.674 +11 42 35.76 25.0r 18VJ137 568 C~4ZZQ 2018 11 08.50644 03 09 49.188 +11 42 33.69 25.0r 18VJ137 568 C~4ZZQ 2018 12 03.04959 03 08 35.063 +11 37 05.55 18VJ137 304 C~4ZZQ 2018 12 03.05755 03 08 35.038 +11 37 05.47 18VJ137 304 C~4ZZQ 2018 12 03.08768 03 08 34.950 +11 37 05.10 18VJ137 304 C~4ZZQ 2018 12 03.09565 03 08 34.923 +11 37 04.97 25.0r 18VJ137 304 C~4ZZQ 2018 12 03.12119 03 08 34.860 +11 37 04.72 18VJ137 304 C~4ZZQ 2018 12 03.12922 03 08 34.839 +11 37 04.85 18VJ137 304 C~4ZZQ 2018 12 04.04327 03 08 32.229 +11 36 53.67 18VJ137 304 C~4ZZQ 2018 12 04.05123 03 08 32.204 +11 36 53.87 18VJ137 304 C~4ZZQ 2018 12 09.10646 03 08 18.222 +11 35 58.68 25.2r 18VJ137 304 C~4ZZQ 2018 12 09.15903 03 08 18.064 +11 35 58.22 25.0r 18VJ137 304 C~4ZZQ 2018 12 12.15185 03 08 10.117 +11 35 28.17 25.1r 18VJ137 304 C~4ZZQ 2019 02 03.05407 03 06 55.230 +11 32 38.66 25.1r 18VJ137 304 C~4ZZQ 2019 11 29.21974 03 11 14.804 +11 36 26.35 25.1r 18VJ137 304 C~4ZZQ 2019 11 30.21260 03 11 11.844 +11 36 14.26 25.2r 18VJ137 304 C~4ZZQ
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 -0.02 0.00 -0.03
2 0.0004 -7.43 0.02 -0.06 0.19
3 0.0676 -1144.53 0.04 -20.99 0.06
4 0.0676 -1144.91 0.02 -20.97 0.08
5 0.0677 -1146.25 0.00 -20.97 0.06
6 0.0677 -1146.67 -0.06 -20.99 0.04
7 0.0678 -1147.63 0.11 -20.98 0.04
8 0.0678 -1147.89 0.20 -20.77 0.24
9 0.0703 -1187.84 -0.20 -21.12 -0.37
10 0.0704 -1188.14 -0.15 -20.83 -0.08
11 0.0842 -1400.85 0.11 -18.17 -0.27
12 0.0843 -1403.21 -0.06 -17.98 -0.13
13 0.0925 -1523.76 -0.05 -15.17 -0.02
14 0.2374 -2628.94 0.04 121.35 0.20
15 1.0565 1104.63 0.15 -693.05 -0.04
16 1.0592 1059.49 -0.15 -692.99 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.
18VJ137 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