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: 16ED391 # Created Thu Sep 4 01:11:08 2025 # Orbit generated from Bernstein formalism # Fitting 16 observations of 16 # Arc: 37.93d # First observation: 2016/02/03 # Last observation: 2016/03/12 Preliminary a, adot, b, bdot, g, gdot: -0.000002 0.036764 0.000001 0.004216 0.027279 0.000000 # Chi-squared of fit: 5.49 DOF: 26 RMS: 0.10 # Min/Max residuals: -0.27 0.20 # Exact a, adot, b, bdot, g, gdot: 1.833196E-05 3.165384E-02 2.641695E-06 4.510428E-03 2.651981E-02 6.708019E-03 # Covariance matrix: 3.6234E-13 1.1259E-10 1.7826E-14 -6.4281E-12 1.7892E-11 -4.7680E-10 1.1259E-10 1.8890E-07 3.0216E-11 -1.0771E-08 2.8272E-08 -1.2413E-06 1.7826E-14 3.0216E-11 2.8921E-13 -4.8234E-12 4.4689E-12 -2.2560E-10 -6.4281E-12 -1.0771E-08 -4.8234E-12 6.6784E-10 -1.5989E-09 7.7498E-08 1.7892E-11 2.8272E-08 4.4689E-12 -1.5989E-09 4.2784E-09 -1.6313E-07 -4.7680E-10 -1.2413E-06 -2.2560E-10 7.7498E-08 -1.6313E-07 1.9362E-05 # lat0 lon0 xBary yBary zBary JD0 -16.796234 140.169680 0.114665 -0.282288 -0.935860 2457421.846669 # Heliocentric elements and errors Epoch: 2457420.5000 = 2016/02/02 Mean Anomaly: 9.69613 +/- 4.815 Argument of Peri: 260.64842 +/- 18.725 Long of Asc Node: 203.68962 +/- 0.351 Inclination: 18.15065 +/- 0.053 Eccentricity: 0.52038685 +/- 0.0972 Semi-Major Axis: 75.72303806 +/- 9.8911 Time of Perihelion: 2450938.0929 +/- 2958.1 Perihelion: 36.31776480 +/- 8.7574 Aphelion: 115.12831131 +/- 16.7433 Period (y) 658.9466 +/- 129.11 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -28.40348604 +/- 0.0684 Ecliptic Y 23.83401208 +/- 0.0570 Ecliptic Z -10.89627350 +/- 0.0269 Ecliptic XDOT -0.00270608 +/- 0.0003 Ecliptic YDOT -0.00200568 +/- 0.0003 Ecliptic ZDOT 0.00024568 +/- 0.0001 # Distances at JD0 (AU) Heliocenter to KBO 38.64643486 +/- 0.0618 Geocenter to KBO 37.70766464 +/- 0.0930 # Hcoef: 8.29
The following table shows the complete astrometric record for 16ED391. 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 (16ED391) followed by the observatory code and reference code for the source of the astrometry.
2016 02 03.34588 09 09 20.80 -01 12 55.3 23.8y 16ED391 T09 C~8uaE 2016 02 03.37476 09 09 20.66 -01 12 54.6 23.7y 16ED391 T09 C~8uaE 2016 02 03.38864 09 09 20.58 -01 12 54.1 23.1y 16ED391 T09 C~8uaE 2016 02 03.40518 09 09 20.49 -01 12 53.9 23.9y 16ED391 T09 C~8uaE 2016 02 03.41640 09 09 20.43 -01 12 53.9 23.1y 16ED391 T09 C~8uaE 2016 03 04.23536 09 07 02.03 -00 58 29.8 24.0i 16ED391 T09 C~8HEi 2016 03 04.25126 09 07 01.97 -00 58 29.6 24.2i 16ED391 T09 C~8HEi 2016 03 04.26474 09 07 01.91 -00 58 28.8 24.3i 16ED391 T09 C~8HEi 2016 03 04.28093 09 07 01.85 -00 58 28.4 24.2i 16ED391 T09 C~8HEi 2016 03 04.31992 09 07 01.69 -00 58 27.1 23.8i 16ED391 T09 C~8HEi 2016 03 09.23515 09 06 42.17 -00 55 39.8 24.3r 16ED391 T09 C~8HEi 2016 03 09.26092 09 06 42.08 -00 55 39.0 24.2r 16ED391 T09 C~8HEi 2016 03 09.28024 09 06 42.00 -00 55 38.3 24.5r 16ED391 T09 C~8HEi 2016 03 12.23407 09 06 30.99 -00 53 56.2 24.5z 16ED391 T09 C~8HEi 2016 03 12.25783 09 06 30.91 -00 53 55.3 23.9z 16ED391 T09 C~8HEi 2016 03 12.27134 09 06 30.86 -00 53 55.0 23.8z 16ED391 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 0.11 0.00 0.01
2 0.0001 -2.21 0.15 0.03 0.07
3 0.0001 -3.51 -0.06 0.13 0.20
4 0.0002 -4.85 -0.11 -0.09 -0.01
5 0.0002 -5.71 -0.09 -0.36 -0.27
6 0.0818 -2246.20 -0.11 188.01 0.08
7 0.0819 -2247.12 0.08 187.93 -0.21
8 0.0819 -2248.22 -0.08 188.42 0.11
9 0.0820 -2249.20 0.08 188.52 0.01
10 0.0821 -2251.88 0.13 189.03 0.01
11 0.0955 -2581.82 -0.16 258.82 0.03
12 0.0956 -2583.35 0.02 259.17 -0.01
13 0.0956 -2584.70 -0.06 259.46 0.01
14 0.1037 -2773.17 -0.04 306.19 -0.03
15 0.1038 -2774.59 0.05 306.68 0.08
16 0.1038 -2775.40 0.10 306.74 -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.
16ED391 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