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: 18AG37 # Created Fri Nov 22 02:10:55 2024 # Orbit generated from Bernstein formalism # Fitting 11 observations of 11 # Arc: 2.03y # First observation: 2018/01/15 # Last observation: 2020/01/25 Preliminary a, adot, b, bdot, g, gdot: -0.000007 0.002403 -0.000001 0.000476 0.007566 0.000000 # WARNING Fitting with energy constraint # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # Chi-squared of fit: 5.31 DOF: 17 RMS: 0.12 # Min/Max residuals: -0.22 0.22 # Exact a, adot, b, bdot, g, gdot: 4.554534E-06 2.403313E-03 7.902821E-07 4.748565E-04 7.593712E-03 -3.529809E-04 # Covariance matrix: 4.7677E-13 -9.1090E-12 2.7953E-13 -1.8739E-12 -2.2011E-11 -1.9486E-09 -9.1090E-12 -3.5073E-10 1.0476E-11 -7.5310E-11 -8.9416E-10 -7.7961E-08 2.7953E-13 1.0476E-11 2.5686E-13 1.8576E-12 2.6710E-11 2.3244E-09 -1.8739E-12 -7.5310E-11 1.8576E-12 -1.5805E-11 -1.9181E-10 -1.6723E-08 -2.2011E-11 -8.9416E-10 2.6710E-11 -1.9181E-10 -2.2770E-09 -1.9857E-07 -1.9486E-09 -7.7961E-08 2.3244E-09 -1.6723E-08 -1.9857E-07 -1.7311E-05 # lat0 lon0 xBary yBary zBary JD0 15.047990 120.521265 0.096208 0.255591 -0.950154 2458134.135972 # Heliocentric elements and errors Epoch: 2458130.5000 = 2018/01/12 Mean Anomaly: 196.86490 +/- 315.152 Argument of Peri: 228.98477 +/- 228.985 Long of Asc Node: 68.30410 +/- 68.304 Inclination: 18.66260 +/- 18.663 Eccentricity: 0.65440122 +/- 0.6544 Semi-Major Axis: 80.67657557 +/- 80.6766 Time of Perihelion: 2578070.6308 +/- 9999999.9 Perihelion: 27.88172606 +/- 59.7050 Aphelion: 133.47142509 +/- 143.5337 Period (y) 724.6518 +/- 1086.98 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -65.00444573 +/- -65.0044 Ecliptic Y 110.44119709 +/- 110.4412 Ecliptic Z 34.18994425 +/- 34.1899 Ecliptic XDOT -0.00065548 +/- -0.0007 Ecliptic YDOT -0.00058913 +/- -0.0006 Ecliptic ZDOT 0.00013215 +/- 0.0001 # Distances at JD0 (AU) Heliocenter to KBO 132.63403887 +/- 97.7222 Geocenter to KBO 131.68789819 +/- 131.6879 # Hcoef: 4.16
The following table shows the complete astrometric record for 18AG37. 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 (18AG37) followed by the observatory code and reference code for the source of the astrometry.
2018 01 15.635171 08 26 28.009 +34 41 18.77 25.3G 18AG37 568 C~4ZXz 2018 01 16.630635 08 26 25.988 +34 41 25.98 25.3G 18AG37 568 C~4ZXz 2019 03 01.13333 08 25 43.165 +34 44 02.47 25.3r 18AG37 304 C~4ZXz 2019 03 02.09349 08 25 41.587 +34 44 03.43 25.2r 18AG37 304 C~4ZXz 2019 03 02.14413 08 25 41.512 +34 44 03.30 25.3r 18AG37 304 C~4ZXz 2019 03 03.081253 08 25 40.01 +34 44 04.0 25.3r 18AG37 W84 C~4xVr 2019 03 03.083106 08 25 40.01 +34 44 03.8 25.7g 18AG37 W84 C~4xVr 2019 05 01.29827 08 24 58.399 +34 40 07.42 25.3r 18AG37 568 C~4ZXz 2019 05 02.31035 08 24 58.743 +34 40 00.01 25.2r 18AG37 568 C~4ZXz 2020 01 24.569616 08 27 32.247 +34 41 24.35 25.3G 18AG37 568 C~4ZXz 2020 01 25.444963 08 27 30.456 +34 41 29.84 25.0G 18AG37 568 C~4ZXz
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 0.09 0.00 0.04
2 0.0027 -25.93 -0.02 0.87 0.02
3 1.1211 -576.20 -0.00 23.37 -0.14
4 1.1238 -595.30 -0.22 19.56 0.06
5 1.1239 -596.16 -0.07 19.20 -0.07
6 1.1265 -614.29 -0.07 15.37 0.09
7 1.1265 -614.24 0.02 15.18 -0.09
8 1.2886 -1054.60 0.11 -338.78 -0.18
9 1.2914 -1048.69 0.12 -344.94 0.22
10 2.0231 766.38 0.04 201.08 0.06
11 2.0255 743.62 0.01 200.92 0.00
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.
18AG37 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 80.735 80.766 80.703 ecceobj 0.652 0.651 0.652 incobj 18.482 18.481 18.482 qmin 26.843 27.003 26.861 qmax 137.710 139.400 141.002 amean 78.891 80.933 80.330 amin 76.231 77.576 76.113 amax 82.863 83.548 84.805 emean 0.648 0.655 0.655 emin 0.630 0.630 0.628 emax 0.663 0.669 0.669 imean 16.583 16.732 16.549 imin 15.782 15.592 15.630 imax 18.391 18.425 19.014 excite_mean 0.708 0.715 0.714 fracstop 0.183 0.187 0.183 cjmean 2.745 2.747 2.744 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 275.5 275.5 273.9 kozaiamp 45.9 46.3 47.4