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: 16FX185 # Created Mon Jul 7 01:11:06 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 20 observations of 20 # Arc: 9.13y # First observation: 2016/03/07 # Last observation: 2025/04/23 # Chi-squared of fit: 5.09 DOF: 34 RMS: 0.09 # Min/Max residuals: -0.16 0.23 # Exact a, adot, b, bdot, g, gdot: 1.539113E-05 1.902532E-02 4.819062E-07 3.394735E-04 2.027421E-02 -8.655080E-03 # Covariance matrix: 1.7034E-13 -1.3662E-13 -2.2020E-15 -3.8829E-15 1.5595E-13 -7.4049E-13 -1.3662E-13 9.9204E-13 -5.7194E-15 2.4760E-14 1.1490E-13 5.5283E-12 -2.2020E-15 -5.7194E-15 8.9621E-14 -1.0766E-14 -8.3892E-15 -3.0516E-14 -3.8829E-15 2.4760E-14 -1.0766E-14 6.6403E-15 9.8944E-16 1.3920E-13 1.5595E-13 1.1490E-13 -8.3892E-15 9.8944E-16 4.6271E-13 5.5401E-13 -7.4049E-13 5.5283E-12 -3.0516E-14 1.3920E-13 5.5401E-13 3.1014E-11 # lat0 lon0 xBary yBary zBary JD0 10.002467 -151.529484 0.654325 0.129024 -0.730721 2457455.089099 # Heliocentric elements and errors Epoch: 2457454.5000 = 2016/03/07 Mean Anomaly: 334.31911 +/- 0.015 Argument of Peri: 161.99006 +/- 0.021 Long of Asc Node: 123.97038 +/- 0.001 Inclination: 9.91124 +/- 0.000 Eccentricity: 0.53064296 +/- 0.0003 Semi-Major Axis: 77.27438076 +/- 0.0302 Time of Perihelion: 2475153.9276 +/- 135.7 Perihelion: 36.26927439 +/- 0.0261 Aphelion: 118.27948713 +/- 0.0512 Period (y) 679.2998 +/- 0.40 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -43.66722003 +/- 0.0014 Ecliptic Y -22.93662015 +/- 0.0008 Ecliptic Z 8.56711125 +/- 0.0003 Ecliptic XDOT 0.00224344 +/- 0.0000 Ecliptic YDOT -0.00171297 +/- 0.0000 Ecliptic ZDOT -0.00015785 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 50.06340130 +/- 0.0013 Geocenter to KBO 49.32409716 +/- 0.0017 # Hcoef: 6.28
The following table shows the complete astrometric record for 16FX185. 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 (16FX185) followed by the observatory code and reference code for the source of the astrometry.
2016 03 07.58831 13 59 59.99 -01 34 08.8 23.3g 16FX185 T09 C~89TP 2016 03 07.62208 13 59 59.92 -01 34 08.0 23.9g 16FX185 T09 C~89TP 2016 03 07.63555 13 59 59.88 -01 34 07.6 24.1g 16FX185 T09 C~89TP 2016 03 16.45267 13 59 35.84 -01 30 38.9 22.8z 16FX185 T09 C~89TP 2016 03 16.45608 13 59 35.84 -01 30 38.9 23.0z 16FX185 T09 C~89TP 2016 03 16.48283 13 59 35.76 -01 30 38.0 22.8z 16FX185 T09 C~89TP 2016 03 16.53534 13 59 35.59 -01 30 37.0 23.4z 16FX185 T09 C~89TP 2016 03 16.55995 13 59 35.54 -01 30 36.5 23.4z 16FX185 T09 C~89TP 2016 03 16.58177 13 59 35.46 -01 30 35.8 23.4z 16FX185 T09 C~89TP 2016 04 15.46627 13 57 51.61 -01 18 42.1 22.3y 16FX185 T09 C~89TP 2016 04 15.49615 13 57 51.49 -01 18 41.6 22.8y 16FX185 T09 C~89TP 2016 04 15.52858 13 57 51.37 -01 18 40.7 22.9y 16FX185 T09 C~89TP 2016 04 15.53670 13 57 51.34 -01 18 40.4 23.4y 16FX185 T09 C~89TP 2016 06 08.254890 13 54 49.58 -01 05 54.8 16FX185 T09 C~8COS 2016 06 08.362536 13 54 49.31 -01 05 54.5 16FX185 T09 C~8COS 2017 03 23.345591 14 03 25.46 -01 50 01.3 16FX185 W84 C~8Djz 2017 03 26.337226 14 03 15.64 -01 48 48.4 16FX185 W84 C~8Djz 2025 04 23.377100 14 37 43.154 -04 46 18.61 22.8G 16FX185 G37 C~8svQ 2025 04 23.412770 14 37 43.009 -04 46 17.95 16FX185 G37 C~8svQ 2025 04 23.456250 14 37 42.825 -04 46 16.87 16FX185 G37 C~8svQ
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 -0.12 0.00 -0.00
2 0.0001 0.00 0.12 0.00 0.02
3 0.0001 0.00 0.04 0.00 0.10
4 0.0243 0.00 -0.13 0.00 0.03
5 0.0243 0.00 0.02 0.00 -0.06
6 0.0244 0.00 0.03 0.00 0.20
7 0.0245 0.00 -0.14 0.00 -0.07
8 0.0246 0.00 0.23 0.00 -0.16
9 0.0246 0.00 0.01 0.00 0.01
10 0.1064 0.00 -0.03 0.00 0.06
11 0.1065 0.00 -0.09 0.00 -0.11
12 0.1066 0.00 -0.01 0.00 0.07
13 0.1066 0.00 0.01 0.00 0.18
14 0.2537 0.00 0.05 0.00 -0.02
15 0.2540 0.00 -0.05 0.00 -0.11
16 1.0425 0.00 0.02 0.00 -0.06
17 1.0506 0.00 -0.08 0.00 -0.04
18 9.1274 0.00 -0.01 0.00 0.03
19 9.1275 0.00 0.04 0.00 -0.08
20 9.1276 0.00 -0.00 0.00 0.06
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.
16FX185 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 75.811 75.810 75.812 ecceobj 0.526 0.526 0.526 incobj 9.915 9.915 9.915 qmin 35.172 35.230 35.186 qmax 122.978 120.445 120.764 amean 76.935 76.579 76.405 amin 75.443 75.233 74.249 amax 79.519 78.230 78.336 emean 0.531 0.529 0.526 emin 0.517 0.518 0.505 emax 0.548 0.540 0.542 imean 8.117 7.920 8.123 imin 7.504 7.263 7.472 imax 8.908 8.557 9.245 excite_mean 0.549 0.546 0.545 fracstop 1.000 1.000 1.000 cjmean 3.074 3.075 3.076 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 181.4 181.2 190.6 kozaiamp 180.0 180.0 180.0