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: 17DU164
# Created Mon Apr 28 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 19 observations of 19
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000040 0.023923 -0.000002 0.000152 0.024195 0.000000
# Chi-squared of fit: 11.31 DOF: 32 RMS: 0.14
# Min/Max residuals: -0.50 0.25
# Exact a, adot, b, bdot, g, gdot:
1.576550E-05 2.389402E-02 -8.013790E-08 1.503333E-04 2.438251E-02 2.149955E-04
# Covariance matrix:
7.3290E-13 -9.6767E-13 2.0156E-15 -4.9662E-15 -3.1650E-13 -1.0103E-11
-9.6767E-13 2.5239E-12 -1.7815E-14 1.7691E-14 -3.3090E-13 3.1381E-11
2.0156E-15 -1.7815E-14 2.3203E-13 -1.4922E-13 1.0541E-14 -2.4789E-13
-4.9662E-15 1.7691E-14 -1.4922E-13 1.4432E-13 -4.6545E-15 2.3681E-13
-3.1650E-13 -3.3090E-13 1.0541E-14 -4.6545E-15 8.8973E-13 -5.7202E-12
-1.0103E-11 3.1381E-11 -2.4789E-13 2.3681E-13 -5.7202E-12 4.1600E-10
# lat0 lon0 xBary yBary zBary JD0
3.569629 -171.827643 -0.115132 0.061739 -0.987572 2457482.943323
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 23.20562 +/- 1.312
Argument of Peri: 59.67153 +/- 1.404
Long of Asc Node: 104.06429 +/- 0.015
Inclination: 3.50274 +/- 0.000
Eccentricity: 0.02979638 +/- 0.0005
Semi-Major Axis: 43.18107640 +/- 0.0107
Time of Perihelion: 2450799.6879 +/- 377.6
Perihelion: 41.89443665 +/- 0.0248
Aphelion: 44.46771614 +/- 0.0251
Period (y) 283.7582 +/- 0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.48451796 +/- 0.0016
Ecliptic Y -6.07606621 +/- 0.0002
Ecliptic Z 2.55355819 +/- 0.0001
Ecliptic XDOT 0.00035871 +/- 0.0000
Ecliptic YDOT -0.00266601 +/- 0.0000
Ecliptic ZDOT 0.00001836 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.00481485 +/- 0.0015
Geocenter to KBO 41.01300707 +/- 0.0016
# Hcoef: 7.24
The following table shows the complete astrometric record for 17DU164. 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 (17DU164) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.442534 12 35 39.12 +00 02 22.1 17DU164 T09 C~83F2 2016 04 04.555772 12 35 38.61 +00 02 25.1 17DU164 T09 C~83F2 2017 02 21.48870 12 43 36.19 -00 49 15.7 22.9z 17DU164 T09 C~81Bw 2017 02 21.51504 12 43 36.10 -00 49 15.2 22.9z 17DU164 T09 C~81Bw 2017 02 21.53656 12 43 36.02 -00 49 14.7 22.9z 17DU164 T09 C~81Bw 2017 02 21.55809 12 43 35.94 -00 49 14.1 22.9z 17DU164 T09 C~81Bw 2017 02 21.60643 12 43 35.78 -00 49 12.8 23.1z 17DU164 T09 C~81Bw 2017 02 23.53005 12 43 29.36 -00 48 24.9 23.9r 17DU164 T09 C~81Bw 2017 02 23.56973 12 43 29.22 -00 48 23.7 24.2r 17DU164 T09 C~81Bw 2017 02 23.61219 12 43 29.07 -00 48 22.7 23.9r 17DU164 T09 C~81Bw 2017 02 23.64192 12 43 28.97 -00 48 22.2 23.8r 17DU164 T09 C~81Bw 2017 03 04.54160 12 42 56.54 -00 44 27.5 22.9y 17DU164 T09 C~81Bw 2017 03 04.58243 12 42 56.38 -00 44 26.2 23.1y 17DU164 T09 C~81Bw 2017 03 04.59585 12 42 56.34 -00 44 25.7 23.1y 17DU164 T09 C~81Bw 2017 03 04.63107 12 42 56.17 -00 44 24.6 23.6y 17DU164 T09 C~81Bw 2017 03 04.63382 12 42 56.18 -00 44 24.6 23.2y 17DU164 T09 C~81Bw 2017 04 27.380876 12 39 06.14 -00 19 50.4 17DU164 T09 C~83F2 2019 04 06.460461 12 50 43.57 -01 32 41.9 17DU164 T09 C~83F2 2019 04 06.501697 12 50 43.38 -01 32 40.7 17DU164 T09 C~83F2
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 -0.06 0.00 0.04
2 0.0003 -8.21 0.06 -0.25 -0.12
3 0.8845 7801.22 0.21 -30.65 0.10
4 0.8845 7799.78 0.25 -30.72 -0.04
5 0.8846 7798.48 0.16 -30.74 -0.11
6 0.8846 7797.14 0.03 -30.66 -0.09
7 0.8848 7794.42 0.02 -30.41 0.02
8 0.8900 7686.90 0.07 -24.26 0.01
9 0.8901 7684.49 -0.03 -23.98 0.18
10 0.8903 7682.03 -0.03 -23.95 0.10
11 0.8903 7680.45 0.11 -24.08 -0.11
12 0.9147 7140.23 -0.08 0.28 -0.22
13 0.9148 7137.51 -0.14 0.53 -0.05
14 0.9149 7136.76 -0.02 0.75 0.15
15 0.9150 7133.98 -0.50 0.76 0.09
16 0.9150 7134.12 -0.19 0.82 0.14
17 1.0621 3379.41 0.13 -2.23 -0.06
18 3.0035 14740.32 0.02 93.89 -0.03
19 3.0036 14737.21 -0.02 93.88 -0.00
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.
17DU164 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.729 42.765 42.694 ecceobj 0.021 0.023 0.019 incobj 3.502 3.502 3.502 qmin 40.796 40.689 40.797 qmax 45.272 45.430 45.142 amean 42.941 42.977 42.906 amin 42.614 42.650 42.579 amax 43.283 43.327 43.239 emean 0.028 0.029 0.026 emin 0.008 0.010 0.006 emax 0.047 0.049 0.044 imean 2.002 2.006 1.999 imin 1.019 1.029 1.009 imax 2.904 2.893 2.918 excite_mean 0.045 0.046 0.043 fracstop 1.000 1.000 1.000 cjmean 3.087 3.087 3.086 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 188.1 187.3 189.0 kozaiamp 180.0 180.0 180.0