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: 17DM160
# Created Sun Apr 27 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 16 observations of 16
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000048 0.021000 0.000002 -0.001087 0.022526 0.000000
# Chi-squared of fit: 4.42 DOF: 26 RMS: 0.09
# Min/Max residuals: -0.20 0.15
# Exact a, adot, b, bdot, g, gdot:
1.416596E-05 2.096446E-02 -7.554939E-07 -1.086580E-03 2.270641E-02 -4.562666E-05
# Covariance matrix:
3.6324E-13 -4.8408E-13 -8.2613E-15 1.9961E-14 -1.5354E-13 -5.7703E-12
-4.8408E-13 1.3788E-12 2.2507E-14 -6.7635E-14 -5.8723E-14 1.9813E-11
-8.2613E-15 2.2507E-14 2.0054E-13 -1.0059E-13 4.4250E-15 3.4162E-13
1.9961E-14 -6.7635E-14 -1.0059E-13 9.5093E-14 3.9737E-15 -1.0418E-12
-1.5354E-13 -5.8723E-14 4.4250E-15 3.9737E-15 6.1008E-13 -1.4376E-12
-5.7703E-12 1.9813E-11 3.4162E-13 -1.0418E-12 -1.4376E-12 3.0542E-10
# lat0 lon0 xBary yBary zBary JD0
4.798489 -169.848795 -0.081247 0.083184 -0.989371 2457482.963558
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 179.37067 +/- 2.380
Argument of Peri: 302.85656 +/- 2.379
Long of Asc Node: 67.87647 +/- 0.007
Inclination: 5.55138 +/- 0.000
Eccentricity: 0.01961945 +/- 0.0001
Semi-Major Axis: 44.16752659 +/- 0.0077
Time of Perihelion: 2511275.1170 +/- 708.6
Perihelion: 43.30098406 +/- 0.0099
Aphelion: 45.03406911 +/- 0.0101
Period (y) 293.5370 +/- 0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -44.16573591 +/- 0.0015
Ecliptic Y -7.99240375 +/- 0.0003
Ecliptic Z 3.68404989 +/- 0.0001
Ecliptic XDOT 0.00044025 +/- 0.0000
Ecliptic YDOT -0.00249619 +/- 0.0000
Ecliptic ZDOT -0.00013101 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 45.03402014 +/- 0.0015
Geocenter to KBO 44.04042207 +/- 0.0015
# Hcoef: 8.05
The following table shows the complete astrometric record for 17DM160. 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 (17DM160) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.462769 12 44 50.54 +00 23 40.7 17DM160 T09 C~81Bu 2016 04 04.517316 12 44 50.29 +00 23 42.1 17DM160 T09 C~81Bu 2016 04 06.486196 12 44 41.98 +00 24 32.6 17DM160 T09 C~81Bu 2016 04 06.608062 12 44 41.46 +00 24 35.9 17DM160 T09 C~81Bu 2017 02 21.50220 12 51 52.47 -00 26 15.9 24.0z 17DM160 T09 C~7xU0 2017 02 21.51771 12 51 52.42 -00 26 15.5 24.3z 17DM160 T09 C~7xU0 2017 02 21.56882 12 51 52.25 -00 26 14.2 24.4z 17DM160 T09 C~7xU0 2017 02 21.59034 12 51 52.20 -00 26 14.0 24.1z 17DM160 T09 C~7xU0 2017 02 21.61177 12 51 52.13 -00 26 13.5 23.6z 17DM160 T09 C~7xU0 2017 02 23.61428 12 51 46.00 -00 25 27.0 24.6r 17DM160 T09 C~7xU0 2017 02 23.64611 12 51 45.90 -00 25 26.1 24.6r 17DM160 T09 C~7xU0 2017 04 27.384634 12 47 38.26 +00 00 49.7 17DM160 T09 C~81Bu 2017 04 27.411358 12 47 38.16 +00 00 50.2 17DM160 T09 C~81Bu 2019 04 06.40557 12 57 45.86 -01 10 57.6 25.0i 17DM160 T09 C~81Bu 2019 04 06.46315 12 57 45.63 -01 10 55.9 25.2i 17DM160 T09 C~81Bu 2019 04 06.50438 12 57 45.45 -01 10 54.9 24.2i 17DM160 T09 C~81Bu
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 0.09 0.00 -0.00
2 0.0001 -4.00 -0.12 -0.18 -0.10
3 0.0055 -138.47 0.04 -2.52 -0.12
4 0.0059 -146.94 -0.02 -2.54 0.06
5 0.8844 6999.59 0.08 -279.08 0.08
6 0.8845 6998.75 0.03 -279.00 0.11
7 0.8846 6995.89 -0.20 -278.81 0.15
8 0.8847 6995.12 0.14 -278.91 -0.02
9 0.8847 6993.96 0.08 -278.87 -0.04
10 0.8902 6891.03 -0.05 -272.07 -0.05
11 0.8903 6889.29 -0.09 -271.83 0.10
12 1.0621 2851.92 -0.03 -276.39 -0.05
13 1.0621 2850.34 0.04 -276.52 -0.07
14 3.0033 12940.94 -0.12 -673.11 -0.20
15 3.0034 12937.08 0.06 -672.90 0.11
16 3.0035 12934.19 0.06 -673.03 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.
17DM160 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.708 43.733 43.684 ecceobj 0.031 0.030 0.031 incobj 5.559 5.558 5.559 qmin 41.799 41.836 41.749 qmax 46.269 46.287 46.242 amean 43.936 43.961 43.912 amin 43.597 43.631 43.573 amax 44.288 44.306 44.266 emean 0.030 0.030 0.031 emin 0.015 0.015 0.016 emax 0.045 0.045 0.045 imean 3.980 3.984 3.975 imin 3.331 3.339 3.316 imax 4.555 4.553 4.550 excite_mean 0.076 0.076 0.076 fracstop 1.000 1.000 1.000 cjmean 3.094 3.094 3.093 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 182.5 181.8 182.8 kozaiamp 179.9 180.0 179.9