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: 16FY185 # Created Wed Nov 27 02:10:37 2024 # Orbit generated from Bernstein formalism # Fitting 21 observations of 21 # Arc: 4.04d # First observation: 2016/03/28 # Last observation: 2016/04/01 Preliminary a, adot, b, bdot, g, gdot: 0.000000 0.032912 -0.000000 -0.005330 0.027479 0.000000 # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # WARNING Fitting with energy constraint # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # Chi-squared of fit: 2.27 DOF: 37 RMS: 0.06 # Min/Max residuals: -0.11 0.14 # Exact a, adot, b, bdot, g, gdot: 1.622908E-05 2.652898E-02 -3.295670E-06 -5.149564E-03 2.646220E-02 4.328582E-03 # Covariance matrix: 7.8430E-11 1.3071E-07 -8.3321E-13 -3.7085E-09 2.0855E-08 -3.7329E-07 1.3071E-07 2.1865E-04 -1.3933E-09 -6.2020E-06 3.4877E-05 -6.2826E-04 -8.3321E-13 -1.3933E-09 2.5989E-13 1.0240E-11 -2.2226E-10 3.9637E-09 -3.7085E-09 -6.2020E-06 1.0240E-11 1.8066E-07 -9.8931E-07 1.7770E-05 2.0855E-08 3.4877E-05 -2.2226E-10 -9.8931E-07 5.5635E-06 -9.9946E-05 -3.7329E-07 -6.2826E-04 3.9637E-09 1.7770E-05 -9.9946E-05 2.9567E-03 # lat0 lon0 xBary yBary zBary JD0 -14.098831 -177.980653 -0.096730 -0.240864 -0.959728 2457475.668904 # Heliocentric elements and errors Epoch: 2457470.5000 = 2016/03/23 Mean Anomaly: 61.74327 +/- 173.201 Argument of Peri: 151.80374 +/- 33.924 Long of Asc Node: 311.41556 +/- 14.921 Inclination: 17.52387 +/- 3.541 Eccentricity: 0.16819976 +/- 1.8906 Semi-Major Axis: 41.01513446 +/- 20.4680 Time of Perihelion: 2441015.3541 +/- 44486.0 Perihelion: 34.11639862 +/- 79.3913 Aphelion: 47.91387029 +/- 81.1470 Period (y) 262.6784 +/- 196.63 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -37.61783553 +/- 3.2649 Ecliptic Y -1.42564146 +/- 0.1148 Ecliptic Z -9.20553738 +/- 0.8205 Ecliptic XDOT -0.00020761 +/- 0.0055 Ecliptic YDOT -0.00276077 +/- 0.0011 Ecliptic ZDOT -0.00062582 +/- 0.0014 # Distances at JD0 (AU) Heliocenter to KBO 38.75404394 +/- 3.1752 Geocenter to KBO 37.78975095 +/- 3.3684 # Hcoef: 6.81
The following table shows the complete astrometric record for 16FY185. 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 (16FY185) followed by the observatory code and reference code for the source of the astrometry.
2016 03 28.168115 11 44 31.588 -13 42 53.15 22.5V 16FY185 W84 C~89TP 2016 03 28.171286 11 44 31.573 -13 42 53.13 22.6V 16FY185 W84 C~89TP 2016 03 28.174475 11 44 31.559 -13 42 53.08 22.5V 16FY185 W84 C~89TP 2016 03 28.177638 11 44 31.554 -13 42 52.93 22.5V 16FY185 W84 C~89TP 2016 03 30.156017 11 44 21.783 -13 41 50.52 22.6V 16FY185 W84 C~89TP 2016 03 30.159231 11 44 21.760 -13 41 50.39 22.9V 16FY185 W84 C~89TP 2016 03 30.162414 11 44 21.754 -13 41 50.36 23.2V 16FY185 W84 C~89TP 2016 03 30.165620 11 44 21.729 -13 41 50.18 22.5V 16FY185 W84 C~89TP 2016 03 30.168785 11 44 21.719 -13 41 50.00 22.7V 16FY185 W84 C~89TP 2016 03 31.118793 11 44 17.060 -13 41 19.75 22.7V 16FY185 W84 C~89TP 2016 03 31.125149 11 44 17.037 -13 41 19.55 23.0V 16FY185 W84 C~89TP 2016 03 31.131497 11 44 17.012 -13 41 19.35 22.7V 16FY185 W84 C~89TP 2016 03 31.181313 11 44 16.760 -13 41 17.71 22.4V 16FY185 W84 C~89TP 2016 03 31.187687 11 44 16.731 -13 41 17.58 22.9V 16FY185 W84 C~89TP 2016 03 31.190867 11 44 16.709 -13 41 17.42 22.7V 16FY185 W84 C~89TP 2016 04 01.139596 11 44 12.093 -13 40 46.84 22.8V 16FY185 W84 C~89TP 2016 04 01.145928 11 44 12.062 -13 40 46.62 22.7V 16FY185 W84 C~89TP 2016 04 01.198559 11 44 11.802 -13 40 44.96 22.8V 16FY185 W84 C~89TP 2016 04 01.201709 11 44 11.785 -13 40 44.80 22.6V 16FY185 W84 C~89TQ 2016 04 01.204892 11 44 11.782 -13 40 44.71 22.8V 16FY185 W84 C~89TQ 2016 04 01.208040 11 44 11.749 -13 40 44.63 23.1V 16FY185 W84 C~89TQ
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 -0.08 0.00 0.05
2 0.0000 -0.21 -0.03 -0.07 -0.02
3 0.0000 -0.41 0.02 -0.11 -0.05
4 0.0000 -0.54 0.14 -0.00 0.06
5 0.0054 -156.00 0.01 -1.34 -0.01
6 0.0055 -156.36 -0.09 -1.35 -0.03
7 0.0055 -156.46 0.07 -1.36 -0.03
8 0.0055 -156.86 -0.08 -1.35 -0.02
9 0.0055 -157.07 -0.04 -1.24 0.09
10 0.0081 -231.40 -0.11 -1.44 -0.07
11 0.0081 -231.79 0.00 -1.40 -0.02
12 0.0081 -232.20 0.09 -1.36 0.01
13 0.0082 -236.22 0.02 -1.37 0.03
14 0.0083 -236.66 0.08 -1.42 -0.03
15 0.0083 -237.02 -0.02 -1.41 -0.01
16 0.0109 -310.92 -0.01 -1.06 0.00
17 0.0109 -311.42 -0.01 -1.04 0.02
18 0.0110 -315.56 0.01 -1.08 -0.02
19 0.0110 -315.85 -0.03 -1.03 0.02
20 0.0111 -315.93 0.14 -0.97 0.09
21 0.0111 -316.40 -0.08 -1.09 -0.04
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.