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: 17DM162
# Created Mon Apr 28 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 26 observations of 26
# Arc: 0.90y
# First observation: 2016/04/02
# Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000036 0.018205 0.000000 -0.002670 0.020823 0.000000
# Chi-squared of fit: 13.51 DOF: 46 RMS: 0.13
# Min/Max residuals: -0.33 0.37
# Exact a, adot, b, bdot, g, gdot:
1.350033E-05 1.811960E-02 -2.275349E-06 -2.687124E-03 2.120019E-02 1.503146E-03
# Covariance matrix:
2.1824E-13 1.9433E-12 1.0640E-14 -2.4948E-13 1.0392E-12 9.7949E-11
1.9433E-12 1.5025E-10 6.4257E-13 -1.6419E-11 5.8740E-11 6.3987E-09
1.0640E-14 6.4257E-13 1.6299E-13 -2.6311E-13 2.6270E-13 2.7796E-11
-2.4948E-13 -1.6419E-11 -2.6311E-13 2.1650E-12 -6.5486E-12 -7.0476E-10
1.0392E-12 5.8740E-11 2.6270E-13 -6.5486E-12 2.4501E-11 2.5573E-09
9.7949E-11 6.3987E-09 2.7796E-11 -7.0476E-10 2.5573E-09 2.7483E-07
# lat0 lon0 xBary yBary zBary JD0
3.079530 -174.410421 -0.125095 0.053200 -0.986300 2457480.920788
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 127.85477 +/- 10.021
Argument of Peri: 22.85364 +/- 9.749
Long of Asc Node: 25.31792 +/- 0.007
Inclination: 8.93648 +/- 0.003
Eccentricity: 0.11468339 +/- 0.0174
Semi-Major Axis: 44.68540368 +/- 0.1927
Time of Perihelion: 2418731.4207 +/- 3026.6
Perihelion: 39.56072989 +/- 0.7948
Aphelion: 49.81007746 +/- 0.8055
Period (y) 298.7148 +/- 1.93
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -47.85188491 +/- 0.0109
Ecliptic Y -4.81114079 +/- 0.0011
Ecliptic Z 2.53395603 +/- 0.0006
Ecliptic XDOT 0.00001656 +/- 0.0001
Ecliptic YDOT -0.00235657 +/- 0.0000
Ecliptic ZDOT -0.00033609 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 48.15984737 +/- 0.0109
Geocenter to KBO 47.16939458 +/- 0.0110
# Hcoef: 8.99
The following table shows the complete astrometric record for 17DM162. 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 (17DM162) followed by the observatory code and reference code for the source of the astrometry.
2016 04 02.419999 12 25 24.13 +00 36 26.6 17DM162 T09 C~81Bu 2016 04 02.525980 12 25 23.70 +00 36 29.1 17DM162 T09 C~81Bu 2016 04 04.35736 12 25 16.41 +00 37 12.2 26.6g 17DM162 T09 C~8COu 2016 04 04.37012 12 25 16.32 +00 37 12.6 26.6g 17DM162 T09 C~8COu 2016 04 04.41508 12 25 16.16 +00 37 13.6 26.5g 17DM162 T09 C~8COu 2016 04 04.52167 12 25 15.73 +00 37 16.3 26.0g 17DM162 T09 C~8COu 2016 04 05.438298 12 25 12.09 +00 37 37.6 17DM162 T09 C~81Bu 2016 04 05.556253 12 25 11.61 +00 37 40.4 17DM162 T09 C~81Bu 2016 06 05.320049 12 22 20.17 +00 51 51.8 17DM162 T09 C~81Bu 2016 06 05.358251 12 22 20.14 +00 51 51.9 17DM162 T09 C~81Bu 2017 01 23.624307 12 32 36.22 -00 20 25.2 17DM162 T09 C~81Bu 2017 01 23.630400 12 32 36.21 -00 20 25.1 17DM162 T09 C~81Bu 2017 01 23.651896 12 32 36.18 -00 20 24.9 17DM162 T09 C~81Bu 2017 01 28.600753 12 32 28.69 -00 19 26.9 17DM162 T09 C~81Bu 2017 01 28.622268 12 32 28.65 -00 19 26.6 17DM162 T09 C~81Bu 2017 02 01.646197 12 32 21.28 -00 18 31.4 17DM162 T09 C~81Bu 2017 02 01.657063 12 32 21.26 -00 18 31.3 17DM162 T09 C~81Bu 2017 02 01.662482 12 32 21.25 -00 18 31.3 17DM162 T09 C~81Bu 2017 02 02.627627 12 32 19.31 -00 18 17.0 17DM162 T09 C~81Bu 2017 02 02.647237 12 32 19.26 -00 18 16.8 17DM162 T09 C~81Bu 2017 02 23.53583 12 31 23.34 -00 11 50.7 25.7r 17DM162 T09 C~7zpm 2017 02 23.56346 12 31 23.24 -00 11 50.4 25.3r 17DM162 T09 C~7zpm 2017 02 23.57406 12 31 23.24 -00 11 50.1 25.2r 17DM162 T09 C~7zpm 2017 02 23.60592 12 31 23.09 -00 11 49.2 25.6r 17DM162 T09 C~7zpm 2017 02 23.60801 12 31 23.10 -00 11 49.1 26.0r 17DM162 T09 C~7zpm 2017 02 23.63774 12 31 23.02 -00 11 48.6 25.8r 17DM162 T09 C~7zpm
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 0.00 0.00 0.06
2 0.0003 -6.91 0.03 -0.26 0.05
3 0.0053 -124.39 0.26 -3.97 0.00
4 0.0053 -125.78 -0.30 -4.14 -0.13
5 0.0055 -128.38 0.03 -4.17 -0.05
6 0.0058 -135.37 -0.03 -4.24 0.14
7 0.0083 -193.94 0.03 -6.30 0.02
8 0.0086 -201.66 -0.05 -6.58 0.04
9 0.1749 -2900.22 -0.07 -242.56 -0.14
10 0.1751 -2900.68 0.09 -242.64 -0.01
11 0.8110 7305.55 -0.00 -566.69 0.09
12 0.8110 7305.37 -0.04 -566.66 0.11
13 0.8110 7304.88 -0.02 -566.66 0.09
14 0.8246 7178.59 -0.08 -557.87 -0.20
15 0.8246 7177.92 -0.12 -557.84 -0.19
16 0.8357 7054.40 0.05 -550.91 0.04
17 0.8357 7054.09 0.11 -550.94 -0.00
18 0.8357 7053.95 0.15 -551.00 -0.07
19 0.8384 7021.53 0.05 -549.39 0.01
20 0.8384 7020.76 -0.03 -549.50 -0.12
21 0.8956 6096.71 -0.09 -527.06 0.11
22 0.8957 6095.21 -0.09 -527.38 -0.21
23 0.8957 6095.09 0.37 -527.11 0.07
24 0.8958 6092.66 -0.33 -527.17 0.00
25 0.8958 6092.76 -0.12 -527.02 0.15
26 0.8959 6091.46 0.19 -527.04 0.13
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.
17DM162 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.276 45.096 43.917 ecceobj 0.123 0.174 0.100 incobj 8.984 8.975 8.992 qmin 38.047 36.512 38.974 qmax 51.167 54.518 49.540 amean 44.463 45.317 44.116 amin 44.095 44.905 43.768 amax 44.869 45.782 44.496 emean 0.125 0.175 0.097 emin 0.109 0.159 0.082 emax 0.142 0.192 0.114 imean 8.261 8.162 8.236 imin 7.467 7.244 7.558 imax 8.918 8.947 8.932 excite_mean 0.191 0.226 0.173 fracstop 1.000 1.000 1.000 cjmean 3.063 3.055 3.066 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 176.0 179.8 176.5 kozaiamp 180.0 180.0 179.9