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: 18JT6 # Created Mon Apr 28 01:11:10 2025 # Orbit generated from Bernstein formalism # Fitting 5 observations of 5 # Arc: 0.81y # First observation: 2018/05/10 # Last observation: 2019/03/01 Preliminary a, adot, b, bdot, g, gdot: -0.000000 0.011448 -0.000000 0.005005 0.016554 0.000000 # WARNING Fitting with energy constraint # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # Chi-squared of fit: 0.48 DOF: 5 RMS: 0.05 # Min/Max residuals: -0.08 0.08 # Exact a, adot, b, bdot, g, gdot: 1.074850E-05 1.113578E-02 4.341036E-06 4.976793E-03 1.659136E-02 -5.075096E-03 # Covariance matrix: 9.8789E-13 2.2542E-11 -6.2584E-14 1.2729E-11 4.4550E-11 3.1109E-09 2.2542E-11 2.8798E-08 -9.5748E-12 4.7301E-09 5.9713E-09 1.3309E-06 -6.2584E-14 -9.5748E-12 7.5145E-13 -4.5725E-12 -1.1302E-11 -9.1827E-10 1.2729E-11 4.7301E-09 -4.5725E-12 1.1164E-09 2.4901E-09 2.9568E-07 4.4550E-11 5.9713E-09 -1.1302E-11 2.4901E-09 7.9868E-09 6.2061E-07 3.1109E-09 1.3309E-06 -9.1827E-10 2.9568E-07 6.2061E-07 7.9108E-05 # lat0 lon0 xBary yBary zBary JD0 -12.270749 -176.108339 -0.720971 -0.148450 -0.682953 2458249.469771 # Heliocentric elements and errors Epoch: 2458240.5000 = 2018/05/02 Mean Anomaly: 289.05076 +/- 110.197 Argument of Peri: 86.47988 +/- 39.346 Long of Asc Node: 209.77951 +/- 0.173 Inclination: 26.79411 +/- 0.148 Eccentricity: 0.37530225 +/- 0.5596 Semi-Major Axis: 60.01240231 +/- 29.9377 Time of Perihelion: 2491706.6052 +/- 45548.8 Perihelion: 37.48961295 +/- 38.4386 Aphelion: 82.53519167 +/- 53.1320 Period (y) 464.9109 +/- 347.89 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -59.40891215 +/- 0.3165 Ecliptic Y -4.77135008 +/- 0.0215 Ecliptic Z -12.80950638 +/- 0.0690 Ecliptic XDOT 0.00077379 +/- 0.0014 Ecliptic YDOT -0.00179376 +/- 0.0001 Ecliptic ZDOT 0.00098032 +/- 0.0003 # Distances at JD0 (AU) Heliocenter to KBO 60.96120141 +/- 0.3088 Geocenter to KBO 60.27233266 +/- 0.3247 # Hcoef: 6.80
The following table shows the complete astrometric record for 18JT6. 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 (18JT6) followed by the observatory code and reference code for the source of the astrometry.
2018 05 10.96897 11 54 25.873 -12 47 23.15 24.6r 18JT6 807 C~31M1 2018 05 11.96567 11 54 24.059 -12 46 58.76 24.4r 18JT6 807 C~31M1 2019 02 28.16680 12 00 48.082 -13 16 04.05 24.6r 18JT6 304 C~31M1 2019 02 28.21810 12 00 47.930 -13 16 03.19 24.7r 18JT6 304 C~31M1 2019 03 01.34118 12 00 44.521 -13 15 44.63 24.6r 18JT6 304 C~31M1
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 -0.03 0.00 0.08
2 0.0027 -34.16 0.03 11.48 -0.08
3 0.8027 5806.12 -0.01 683.23 0.02
4 0.8029 5803.74 0.04 683.13 0.07
5 0.8059 5750.66 -0.03 680.15 -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.
18JT6 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