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: 16EC391 # Created Mon Jul 7 01:11:04 2025 # Orbit generated from Bernstein formalism # Fitting 17 observations of 17 # Arc: 37.93d # First observation: 2016/02/03 # Last observation: 2016/03/12 Preliminary a, adot, b, bdot, g, gdot: -0.000002 0.029156 0.000002 0.016949 0.027289 0.000000 # Chi-squared of fit: 5.18 DOF: 28 RMS: 0.10 # Min/Max residuals: -0.17 0.30 # Exact a, adot, b, bdot, g, gdot: 1.456439E-05 2.489028E-02 1.009932E-05 1.720442E-02 2.664948E-02 -3.044346E-03 # Covariance matrix: 5.4927E-13 9.2846E-11 3.0353E-14 -4.9808E-12 1.5732E-11 -9.5552E-11 9.2846E-11 1.4830E-07 5.1398E-11 -8.6626E-09 2.2440E-08 -7.7803E-07 3.0353E-14 5.1398E-11 4.8134E-13 -8.2181E-12 7.6301E-12 -3.3950E-10 -4.9808E-12 -8.6626E-09 -8.2181E-12 6.0063E-10 -1.2803E-09 5.9828E-08 1.5732E-11 2.2440E-08 7.6301E-12 -1.2803E-09 3.4350E-09 -1.0027E-07 -9.5552E-11 -7.7803E-07 -3.3950E-10 5.9828E-08 -1.0027E-07 1.2174E-05 # lat0 lon0 xBary yBary zBary JD0 -16.601176 140.935152 0.127713 -0.278637 -0.935264 2457421.846669 # Heliocentric elements and errors Epoch: 2457420.5000 = 2016/02/02 Mean Anomaly: 346.08277 +/- 12.526 Argument of Peri: 358.83764 +/- 24.922 Long of Asc Node: 162.76902 +/- 0.312 Inclination: 37.73674 +/- 0.375 Eccentricity: 0.28870827 +/- 0.0744 Semi-Major Axis: 52.85458157 +/- 2.9751 Time of Perihelion: 2462846.4115 +/- 4861.9 Perihelion: 37.59502660 +/- 4.4643 Aphelion: 68.11413653 +/- 5.4910 Period (y) 384.2662 +/- 32.44 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -28.60199784 +/- 0.0614 Ecliptic Y 23.37418859 +/- 0.0498 Ecliptic Z -10.72062704 +/- 0.0236 Ecliptic XDOT -0.00177136 +/- 0.0003 Ecliptic YDOT -0.00186304 +/- 0.0002 Ecliptic ZDOT 0.00178321 +/- 0.0001 # Distances at JD0 (AU) Heliocenter to KBO 38.46243383 +/- 0.0552 Geocenter to KBO 37.52418928 +/- 0.0825 # Hcoef: 8.23
The following table shows the complete astrometric record for 16EC391. 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 (16EC391) followed by the observatory code and reference code for the source of the astrometry.
2016 02 03.34588 09 12 22.68 -01 15 18.0 23.7y 16EC391 T09 C~8uaE 2016 02 03.36112 09 12 22.60 -01 15 17.5 24.1y 16EC391 T09 C~8uaE 2016 02 03.41911 09 12 22.30 -01 15 15.8 23.3y 16EC391 T09 C~8uaE 2016 03 04.23883 09 09 59.74 -00 56 50.7 24.2i 16EC391 T09 C~8HEi 2016 03 04.25126 09 09 59.70 -00 56 50.2 23.9i 16EC391 T09 C~8HEi 2016 03 04.25395 09 09 59.67 -00 56 50.1 23.5i 16EC391 T09 C~8HEi 2016 03 04.26744 09 09 59.62 -00 56 49.4 23.9i 16EC391 T09 C~8HEi 2016 03 04.28093 09 09 59.57 -00 56 48.9 23.7i 16EC391 T09 C~8HEi 2016 03 04.32261 09 09 59.39 -00 56 47.2 23.5i 16EC391 T09 C~8HEi 2016 03 04.32805 09 09 59.35 -00 56 47.0 23.6i 16EC391 T09 C~8HEi 2016 03 09.23801 09 09 39.08 -00 53 20.0 23.8r 16EC391 T09 C~8HEi 2016 03 09.24797 09 09 39.06 -00 53 19.4 24.5r 16EC391 T09 C~8HEi 2016 03 09.25015 09 09 39.03 -00 53 19.5 24.2r 16EC391 T09 C~8HEi 2016 03 09.28237 09 09 38.90 -00 53 18.2 24.2r 16EC391 T09 C~8HEi 2016 03 12.23749 09 09 27.40 -00 51 12.0 24.2z 16EC391 T09 C~8HEi 2016 03 12.24703 09 09 27.35 -00 51 11.7 23.6z 16EC391 T09 C~8HEi 2016 03 12.27134 09 09 27.25 -00 51 10.5 24.2z 16EC391 T09 C~8HEi
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 0.04 0.00 0.02
2 0.0000 -1.30 -0.00 0.10 0.04
3 0.0002 -6.10 -0.04 0.33 -0.06
4 0.0818 -2381.07 -0.09 390.67 -0.06
5 0.0819 -2381.79 0.12 390.96 -0.01
6 0.0819 -2382.25 -0.14 390.92 -0.11
7 0.0819 -2383.18 -0.06 391.35 0.06
8 0.0820 -2384.05 0.08 391.60 0.04
9 0.0821 -2387.14 0.12 392.38 0.01
10 0.0821 -2387.77 -0.11 392.38 -0.09
11 0.0955 -2740.94 -0.02 495.28 0.04
12 0.0956 -2741.41 0.22 495.76 0.30
13 0.0956 -2741.81 -0.03 495.53 0.02
14 0.0957 -2744.06 0.01 496.16 -0.04
15 0.1037 -2947.15 0.11 562.87 0.01
16 0.1038 -2947.96 -0.04 562.92 -0.15
17 0.1038 -2949.75 -0.17 563.60 -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.
16EC391 quality flag:1 Type: SCATNEAR CENTAURS SCATEXTD axisobj 52.667 72.637 49.199 ecceobj 0.284 0.571 0.216 incobj 37.842 37.137 39.036 qmin 35.971 28.161 37.359 qmax 69.931 122.931 61.221 amean 52.548 73.425 49.050 amin 52.059 69.650 48.612 amax 53.193 76.402 49.567 emean 0.294 0.587 0.219 emin 0.276 0.547 0.204 emax 0.315 0.612 0.236 imean 36.696 35.449 38.041 imin 36.252 33.866 37.710 imax 37.121 37.019 38.347 excite_mean 0.666 0.825 0.654 fracstop 1.000 1.000 1.000 cjmean 2.598 2.469 2.577 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 169.4 142.1 178.6 kozaiamp 180.0 114.7 180.0