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: 17DG165
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 17
# Arc: 4.01y
# First observation: 2015/03/30
# Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
-0.000033 0.022405 -0.000002 0.000867 0.023406 0.000000
# Chi-squared of fit: 2.86 DOF: 28 RMS: 0.07
# Min/Max residuals: -0.14 0.16
# Exact a, adot, b, bdot, g, gdot:
1.495282E-05 2.241309E-02 7.800716E-07 8.669112E-04 2.356074E-02 4.231767E-05
# Covariance matrix:
4.4570E-13 -3.7479E-13 5.0993E-15 -9.2142E-15 -1.3152E-13 -3.1318E-12
-3.7479E-13 6.4312E-13 -1.2563E-14 2.1345E-14 -7.4684E-15 7.4620E-12
5.0993E-15 -1.2563E-14 3.2170E-13 -1.4088E-13 1.0303E-15 -1.6762E-13
-9.2142E-15 2.1345E-14 -1.4088E-13 8.4773E-14 1.0946E-15 2.8489E-13
-1.3152E-13 -7.4684E-15 1.0303E-15 1.0946E-15 6.9657E-13 -7.9433E-14
-3.1318E-12 7.4620E-12 -1.6762E-13 2.8489E-13 -7.9433E-14 9.9581E-11
# lat0 lon0 xBary yBary zBary JD0
2.835055 -172.637603 -0.031311 0.049342 -0.993822 2457111.857159
# Heliocentric elements and errors
Epoch: 2457110.5000 = 2015/03/29
Mean Anomaly: 70.59940 +/- 1.685
Argument of Peri: 340.41818 +/- 1.724
Long of Asc Node: 135.96455 +/- 0.010
Inclination: 3.54071 +/- 0.000
Eccentricity: 0.00434158 +/- 0.0004
Semi-Major Axis: 43.50244484 +/- 0.0069
Time of Perihelion: 2436557.8674 +/- 490.6
Perihelion: 43.31357540 +/- 0.0205
Aphelion: 43.69131429 +/- 0.0205
Period (y) 286.9318 +/- 0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -43.02796267 +/- 0.0015
Ecliptic Y -5.59108105 +/- 0.0002
Ecliptic Z 2.09934367 +/- 0.0001
Ecliptic XDOT 0.00033051 +/- 0.0000
Ecliptic YDOT -0.00258886 +/- 0.0000
Ecliptic ZDOT 0.00010095 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.44045353 +/- 0.0015
Geocenter to KBO 42.44349731 +/- 0.0015
# Hcoef: 7.46
The following table shows the complete astrometric record for 17DG165. 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 (17DG165) followed by the observatory code and reference code for the source of the astrometry.
2015 03 30.356381 12 31 31.26 -00 19 00.9 17DG165 T09 C~86uy 2015 03 30.369488 12 31 31.20 -00 19 00.5 17DG165 T09 C~86uy 2015 03 30.395233 12 31 31.09 -00 18 59.8 17DG165 T09 C~86uy 2016 04 04.442534 12 35 54.57 -00 44 00.4 17DG165 T09 C~86uy 2016 04 04.504591 12 35 54.30 -00 43 58.5 17DG165 T09 C~86uy 2017 02 21.48870 12 43 31.49 -01 30 53.7 23.5z 17DG165 T09 C~81Bx 2017 02 21.55809 12 43 31.26 -01 30 52.1 23.4z 17DG165 T09 C~81Bx 2017 02 21.60109 12 43 31.13 -01 30 51.1 23.5z 17DG165 T09 C~81Bx 2017 02 23.53005 12 43 24.87 -01 30 04.7 24.0r 17DG165 T09 C~81Bx 2017 02 23.60167 12 43 24.62 -01 30 03.1 24.2r 17DG165 T09 C~81Bx 2017 02 23.63353 12 43 24.52 -01 30 02.4 24.5r 17DG165 T09 C~81Bx 2017 03 04.582422 12 42 52.89 -01 26 14.4 17DG165 T09 C~86uy 2017 03 04.620295 12 42 52.75 -01 26 13.4 17DG165 T09 C~86uy 2017 03 30.386038 12 41 06.33 -01 14 12.0 17DG165 T09 C~86uy 2017 03 30.394740 12 41 06.30 -01 14 11.8 17DG165 T09 C~86uy 2018 05 11.073969 12 43 09.876 -01 24 58.79 23.2V 17DG165 W84 C~8HKW 2019 04 03.469560 12 50 28.13 -02 07 46.2 17DG165 T09 C~86uy
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 0.02 0.00 -0.04
2 0.0000 -0.98 -0.02 0.01 -0.03
3 0.0001 -2.78 0.04 0.00 -0.04
4 1.0160 4221.31 -0.04 179.90 -0.13
5 1.0161 4216.84 -0.07 180.05 0.04
6 1.9004 11639.63 -0.04 294.88 0.08
7 1.9006 11635.82 -0.07 294.99 0.02
8 1.9007 11633.63 0.08 295.14 0.06
9 1.9060 11528.74 -0.08 300.84 0.14
10 1.9062 11524.65 -0.14 300.83 -0.03
11 1.9063 11522.99 -0.00 300.89 -0.06
12 1.9308 10995.67 0.07 323.71 -0.00
13 1.9309 10993.34 0.13 323.80 0.02
14 2.0015 9238.12 0.02 358.25 0.06
15 2.0015 9237.62 0.16 358.25 0.06
16 3.1149 11200.63 -0.06 493.77 -0.02
17 4.0113 18288.23 0.01 719.37 -0.12
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.
17DG165 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.104 43.125 43.083 ecceobj 0.009 0.009 0.009 incobj 3.549 3.549 3.549 qmin 41.763 41.765 41.682 qmax 45.058 45.051 45.034 amean 43.322 43.343 43.300 amin 42.987 43.013 42.967 amax 43.653 43.678 43.634 emean 0.017 0.017 0.017 emin 0.000 0.000 0.000 emax 0.032 0.032 0.032 imean 2.927 2.918 2.937 imin 2.075 2.077 2.074 imax 3.635 3.624 3.649 excite_mean 0.054 0.054 0.054 fracstop 1.000 1.000 1.000 cjmean 3.090 3.090 3.090 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 179.5 179.2 179.0 kozaiamp 180.0 180.0 180.0