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: 17DA165
# Created Wed May 21 01:11:08 2025
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 22
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000065 0.022459 -0.000001 -0.000213 0.023343 0.000000
# Chi-squared of fit: 15.43 DOF: 36 RMS: 0.15
# Min/Max residuals: -0.43 0.33
# Exact a, adot, b, bdot, g, gdot:
1.496045E-05 2.245584E-02 -3.040335E-07 -2.147826E-04 2.347593E-02 6.700971E-04
# Covariance matrix:
7.3295E-13 -9.6467E-13 -5.6667E-15 8.1473E-15 -3.2225E-13 -1.0691E-11
-9.6467E-13 1.6407E-12 6.7488E-15 -1.4262E-14 3.0195E-13 1.9956E-11
-5.6667E-15 6.7488E-15 2.0958E-13 -1.2198E-13 6.3962E-15 7.8932E-14
8.1473E-15 -1.4262E-14 -1.2198E-13 1.0696E-13 -3.6129E-15 -1.8414E-13
-3.2225E-13 3.0195E-13 6.3962E-15 -3.6129E-15 4.6396E-13 3.2202E-12
-1.0691E-11 1.9956E-11 7.8932E-14 -1.8414E-13 3.2202E-12 2.6087E-10
# lat0 lon0 xBary yBary zBary JD0
4.594343 -171.544080 -0.110894 0.079427 -0.986801 2457482.981437
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 61.16087 +/- 0.313
Argument of Peri: 32.12004 +/- 0.385
Long of Asc Node: 91.53129 +/- 0.010
Inclination: 4.52399 +/- 0.000
Eccentricity: 0.03667942 +/- 0.0007
Semi-Major Axis: 44.32490971 +/- 0.0073
Time of Perihelion: 2439168.2640 +/- 93.7
Perihelion: 42.69909753 +/- 0.0316
Aphelion: 45.95072188 +/- 0.0318
Period (y) 295.1073 +/- 0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.96498431 +/- 0.0012
Ecliptic Y -6.50162806 +/- 0.0002
Ecliptic Z 3.41204916 +/- 0.0001
Ecliptic XDOT 0.00030619 +/- 0.0000
Ecliptic YDOT -0.00260915 +/- 0.0000
Ecliptic ZDOT -0.00001870 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.58787817 +/- 0.0012
Geocenter to KBO 42.59682598 +/- 0.0012
# Hcoef: 7.56
The following table shows the complete astrometric record for 17DA165. 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 (17DA165) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.480648 12 38 18.33 +00 52 12.5 17DA165 T09 C~85Iz 2016 04 04.493549 12 38 18.27 +00 52 12.9 17DA165 T09 C~85Iz 2017 02 21.49884 12 45 49.09 +00 01 54.9 23.5z 17DA165 T09 C~81Bx 2017 02 21.52305 12 45 49.03 +00 01 55.9 24.0z 17DA165 T09 C~81Bx 2017 02 21.54460 12 45 48.94 +00 01 55.9 23.6z 17DA165 T09 C~81Bx 2017 02 21.56614 12 45 48.89 +00 01 56.6 23.5z 17DA165 T09 C~81Bx 2017 02 21.59841 12 45 48.76 +00 01 57.3 23.6z 17DA165 T09 C~81Bx 2017 02 21.61716 12 45 48.71 +00 01 58.0 23.7z 17DA165 T09 C~81Bx 2017 02 23.54421 12 45 42.54 +00 02 45.8 24.0r 17DA165 T09 C~81Bx 2017 02 23.58033 12 45 42.42 +00 02 46.7 24.1r 17DA165 T09 C~81Bx 2017 02 23.61219 12 45 42.31 +00 02 47.3 24.2r 17DA165 T09 C~81Bx 2017 02 23.65456 12 45 42.17 +00 02 48.3 24.1r 17DA165 T09 C~81Bx 2017 03 04.55518 12 45 11.00 +00 06 40.0 23.7y 17DA165 T09 C~81Bx 2017 03 04.59585 12 45 10.84 +00 06 41.0 23.9y 17DA165 T09 C~81Bx 2017 03 04.65010 12 45 10.64 +00 06 42.2 23.7y 17DA165 T09 C~81Bx 2017 04 27.380876 12 41 27.97 +00 30 17.5 17DA165 T09 C~85Iz 2017 04 27.39593 12 41 27.88 +00 30 17.8 23.9i 17DA165 T09 C~8r8D 2017 04 27.40846 12 41 27.85 +00 30 18.3 23.4i 17DA165 T09 C~8r8D 2017 04 27.417363 12 41 27.82 +00 30 18.3 17DA165 T09 C~85Iz 2019 04 03.477581 12 52 34.29 -00 41 46.8 17DA165 T09 C~85Iz 2019 04 06.449359 12 52 21.40 -00 40 26.4 17DA165 T09 C~85Iz 2019 04 06.460461 12 52 21.35 -00 40 26.1 17DA165 T09 C~85Iz
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 0.03 0.00 0.03
2 0.0000 -0.98 -0.03 0.01 0.06
3 0.8844 7406.30 -0.02 -112.46 -0.31
4 0.8844 7405.08 0.07 -111.89 0.18
5 0.8845 7403.83 -0.00 -112.43 -0.43
6 0.8846 7402.87 0.20 -112.08 -0.15
7 0.8846 7400.80 -0.12 -112.20 -0.38
8 0.8847 7399.83 -0.07 -111.85 -0.10
9 0.8900 7295.80 -0.04 -104.35 0.19
10 0.8901 7293.79 -0.02 -104.23 0.19
11 0.8902 7292.04 0.00 -104.33 -0.01
12 0.8903 7289.71 0.05 -104.24 -0.05
13 0.9146 6768.09 ( -0.08) -75.32 ( 0.45)
14 0.9148 6765.49 -0.12 -75.35 0.33
15 0.9149 6762.26 0.05 -75.43 0.12
16 1.0620 3132.62 0.20 -89.37 0.10
17 1.0621 3131.26 -0.22 -89.63 -0.10
18 1.0621 3130.65 -0.05 -89.35 0.23
19 1.0621 3130.24 0.08 -89.52 0.09
20 2.9952 14043.93 -0.02 -129.78 0.03
21 3.0033 13833.60 0.02 -131.96 -0.01
22 3.0034 13832.78 0.00 -131.98 -0.02
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.
17DA165 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.859 43.884 43.836 ecceobj 0.034 0.036 0.033 incobj 4.523 4.523 4.523 qmin 41.411 41.376 41.439 qmax 46.923 46.989 46.809 amean 44.079 44.103 44.055 amin 43.737 43.761 43.712 amax 44.432 44.459 44.413 emean 0.041 0.042 0.039 emin 0.025 0.026 0.023 emax 0.056 0.058 0.055 imean 2.844 2.845 2.844 imin 2.184 2.188 2.180 imax 3.476 3.477 3.475 excite_mean 0.064 0.065 0.063 fracstop 1.000 1.000 1.000 cjmean 3.097 3.098 3.097 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 175.7 176.2 175.3 kozaiamp 180.0 180.0 180.0