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: 12GX17 # Created Sun Dec 22 02:09:20 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 25 observations of 25 # Arc: 8.02y # First observation: 2012/04/14 # Last observation: 2020/04/22 # Chi-squared of fit: 32.73 DOF: 44 RMS: 0.20 # Min/Max residuals: -0.38 0.42 # Exact a, adot, b, bdot, g, gdot: 1.589759E-05 3.476512E-02 1.018174E-05 2.118361E-02 3.610935E-02 2.370062E-02 # Covariance matrix: 1.1762E-13 -7.5838E-14 1.5863E-14 -3.6213E-14 -1.8543E-14 -2.6034E-13 -7.5838E-14 2.1789E-13 -5.3735E-14 1.2594E-13 -2.1223E-13 9.0615E-13 1.5863E-14 -5.3735E-14 1.0541E-13 -4.8828E-14 5.0074E-14 -2.3364E-13 -3.6213E-14 1.2594E-13 -4.8828E-14 8.5474E-14 -1.2574E-13 5.4740E-13 -1.8543E-14 -2.1223E-13 5.0074E-14 -1.2574E-13 9.0265E-13 -9.0657E-13 -2.6034E-13 9.0615E-13 -2.3364E-13 5.4740E-13 -9.0657E-13 3.9386E-12 # lat0 lon0 xBary yBary zBary JD0 -9.513359 -165.822821 -0.182660 -0.163579 -0.976043 2456031.839716 # Heliocentric elements and errors Epoch: 2456032.5000 = 2012/04/15 Mean Anomaly: 36.21607 +/- 0.012 Argument of Peri: 243.53339 +/- 0.010 Long of Asc Node: 209.19170 +/- 0.000 Inclination: 32.60401 +/- 0.000 Eccentricity: 0.55000625 +/- 0.0001 Semi-Major Axis: 37.47450053 +/- 0.0082 Time of Perihelion: 2447603.0154 +/- 3.9 Perihelion: 16.86329097 +/- 0.0045 Aphelion: 58.08571008 +/- 0.0129 Period (y) 229.4098 +/- 0.08 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -27.39287753 +/- 0.0007 Ecliptic Y -7.10763708 +/- 0.0002 Ecliptic Z -4.57683951 +/- 0.0001 Ecliptic XDOT -0.00133504 +/- 0.0000 Ecliptic YDOT -0.00305103 +/- 0.0000 Ecliptic ZDOT 0.00128717 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 28.66738623 +/- 0.0007 Geocenter to KBO 27.69340324 +/- 0.0007 # Hcoef: 7.80
The following table shows the complete astrometric record for 12GX17. 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 (12GX17) followed by the observatory code and reference code for the source of the astrometry.
2012 04 14.33895 12 37 02.077 -14 20 34.21 22.3w 12GX17 F51 C~0frl 2012 04 14.36865 12 37 01.879 -14 20 32.60 22.3w 12GX17 F51 C~0frl 2012 04 14.38348 12 37 01.780 -14 20 31.87 22.2w 12GX17 F51 C~0frl 2012 04 18.17323 12 36 38.25 -14 16 56.4 22.5R 12GX17 H01 C~0frl 2012 04 18.19007 12 36 38.16 -14 16 55.5 22.6R 12GX17 H01 C~0frl 2012 04 18.20451 12 36 38.08 -14 16 54.5 22.3R 12GX17 H01 C~0frl 2012 04 18.22192 12 36 37.97 -14 16 53.5 21.8R 12GX17 H01 C~0frl 2012 04 18.26365 12 36 37.71 -14 16 51.1 22.7R 12GX17 H01 C~0frl 2012 04 18.27894 12 36 37.60 -14 16 50.5 21.9R 12GX17 H01 C~0frl 2012 04 18.30916 12 36 37.42 -14 16 48.6 21.7R 12GX17 H01 C~0frl 2013 03 16.26319 12 49 26.033 -14 25 13.53 22.7r 12GX17 807 C~12zi 2013 03 16.26319 12 49 26.00 -14 25 14.0 22.4r 12GX17 W84 C~2J9V 2013 03 16.31084 12 49 25.756 -14 25 11.68 22.7r 12GX17 807 C~12zi 2013 03 16.31085 12 49 25.72 -14 25 11.9 12GX17 W84 C~2J9V 2013 03 16.37053 12 49 25.370 -14 25 09.00 22.7r 12GX17 807 C~12zi 2013 03 16.37053 12 49 25.34 -14 25 09.4 12GX17 W84 C~2J9V 2013 05 09.08731 12 44 01.334 -13 38 50.50 22.7r 12GX17 807 C~12zi 2013 05 10.13299 12 43 56.334 -13 37 55.55 22.7r 12GX17 807 C~12zi 2015 03 16.30954 13 06 38.93 -13 43 52.1 22.1R 12GX17 G37 C~1N7Y 2015 03 16.38737 13 06 38.49 -13 43 48.9 12GX17 G37 C~1N7Y 2018 03 22.531680 13 29 03.342 -12 37 29.45 22.7G 12GX17 T14 C~2b0U 2018 03 22.534808 13 29 03.330 -12 37 29.33 22.7G 12GX17 T14 C~2b0U 2020 04 22.39538 13 39 54.968 -11 35 37.44 22.6w 12GX17 F51 C~3qIl 2020 04 22.40701 13 39 54.907 -11 35 37.02 22.4w 12GX17 F51 C~3qIl 2020 04 22.41872 13 39 54.855 -11 35 36.85 22.7w 12GX17 F51 C~3qIl
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 -0.21 0.00 -0.12
2 0.0001 0.00 -0.32 0.00 -0.18
3 0.0001 0.00 -0.38 0.00 -0.29
4 0.0105 0.00 -0.11 0.00 -0.01
5 0.0105 0.00 0.12 0.00 -0.06
6 0.0106 0.00 0.27 0.00 0.11
7 0.0106 0.00 0.25 0.00 0.12
8 0.0107 0.00 0.26 0.00 0.14
9 0.0108 0.00 0.04 0.00 -0.13
10 0.0109 0.00 0.17 0.00 0.04
11 0.9197 0.00 -0.35 0.00 -0.23
12 0.9197 0.00 0.15 0.00 0.24
13 0.9198 0.00 0.42 0.00 0.05
14 0.9198 0.00 -0.12 0.00 -0.17
15 0.9200 0.00 0.16 0.00 0.17
16 0.9200 0.00 -0.29 0.00 -0.23
17 1.0671 0.00 -0.05 0.00 0.39
18 1.0699 0.00 0.18 0.00 0.24
19 2.9185 0.00 -0.22 0.00 -0.18
20 2.9187 0.00 -0.12 0.00 -0.04
21 5.9362 0.00 0.13 0.00 0.12
22 5.9362 0.00 0.21 0.00 0.12
23 8.0221 0.00 -0.20 0.00 0.10
24 8.0221 0.00 -0.10 0.00 0.03
25 8.0221 0.00 0.14 0.00 -0.29
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.
12GX17 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 37.521 37.522 37.521 ecceobj 0.550 0.550 0.550 incobj 32.585 32.585 32.585 qmin 16.751 16.689 16.753 qmax 60.961 58.447 58.431 amean 38.696 37.095 37.233 amin 36.983 36.503 36.906 amax 40.271 38.291 37.755 emean 0.525 0.531 0.541 emin 0.469 0.509 0.533 emax 0.558 0.551 0.550 imean 34.784 33.801 33.238 imin 32.903 32.903 32.903 imax 37.706 34.690 33.449 excite_mean 0.776 0.769 0.770 fracstop 0.028 0.018 0.014 cjmean 2.372 2.385 2.383 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 257.1 253.8 250.6 kozaiamp 12.2 10.1 7.0