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: 17DF165
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 13 observations of 13
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
-0.000032 0.025450 -0.000001 -0.000321 0.024732 0.000000
# Chi-squared of fit: 3.74 DOF: 20 RMS: 0.09
# Min/Max residuals: -0.21 0.20
# Exact a, adot, b, bdot, g, gdot:
1.578265E-05 2.529121E-02 -2.261483E-07 -3.208729E-04 2.512812E-02 -1.185232E-03
# Covariance matrix:
6.7463E-13 -1.8072E-12 3.6917E-16 1.8226E-14 2.5357E-13 -2.0465E-11
-1.8072E-12 8.2622E-12 -1.7213E-14 -8.5720E-14 -2.2095E-12 1.0040E-10
3.6917E-16 -1.7213E-14 2.7636E-13 -1.9045E-13 1.2775E-14 -2.0346E-13
1.8226E-14 -8.5720E-14 -1.9045E-13 2.2465E-13 2.0994E-14 -1.0744E-12
2.5357E-13 -2.2095E-12 1.2775E-14 2.0994E-14 1.1035E-12 -2.6886E-11
-2.0465E-11 1.0040E-10 -2.0346E-13 -1.0744E-12 -2.6886E-11 1.2551E-09
# lat0 lon0 xBary yBary zBary JD0
3.718619 -172.719197 -0.131137 0.064175 -0.985427 2457482.979318
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 324.05400 +/- 0.912
Argument of Peri: 142.48513 +/- 1.089
Long of Asc Node: 85.90408 +/- 0.016
Inclination: 3.70327 +/- 0.000
Eccentricity: 0.06932848 +/- 0.0007
Semi-Major Axis: 43.12887955 +/- 0.0117
Time of Perihelion: 2467810.4629 +/- 262.0
Perihelion: 40.13881991 +/- 0.0329
Aphelion: 46.11893920 +/- 0.0335
Period (y) 283.2438 +/- 0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -40.35868790 +/- 0.0016
Ecliptic Y -5.29073855 +/- 0.0002
Ecliptic Z 2.58106162 +/- 0.0001
Ecliptic XDOT 0.00047493 +/- 0.0000
Ecliptic YDOT -0.00272434 +/- 0.0000
Ecliptic ZDOT -0.00004326 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 40.78575098 +/- 0.0016
Geocenter to KBO 39.79605276 +/- 0.0017
# Hcoef: 8.80
The following table shows the complete astrometric record for 17DF165. 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 (17DF165) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.478529 12 32 36.96 +00 31 37.6 17DF165 T09 C~86uy 2016 04 04.555772 12 32 36.59 +00 31 39.8 17DF165 T09 C~86uy 2016 06 05.328496 12 29 12.92 +00 49 41.4 17DF165 T09 C~86uy 2017 01 30.657082 12 41 52.90 -00 31 44.9 17DF165 T09 C~86uy 2017 02 02.664746 12 41 47.14 -00 30 53.0 17DF165 T09 C~86uy 2017 02 21.53656 12 40 55.09 -00 23 58.9 24.4z 17DF165 T09 C~81Bx 2017 02 21.56347 12 40 54.99 -00 23 58.1 24.2z 17DF165 T09 C~81Bx 2017 02 21.60643 12 40 54.84 -00 23 56.9 24.7z 17DF165 T09 C~81Bx 2017 02 23.54142 12 40 48.11 -00 23 07.2 25.1r 17DF165 T09 C~81Bx 2017 02 23.56764 12 40 48.02 -00 23 06.5 24.8r 17DF165 T09 C~81Bx 2017 02 23.61010 12 40 47.88 -00 23 05.5 25.2r 17DF165 T09 C~81Bx 2017 02 23.64192 12 40 47.75 -00 23 04.7 25.2r 17DF165 T09 C~81Bx 2019 04 03.445386 12 48 44.10 -01 15 44.6 17DF165 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 0.03 0.00 0.00
2 0.0002 -5.97 -0.13 -0.17 -0.06
3 0.1693 -3240.00 0.10 -211.48 -0.08
4 0.8246 9168.81 0.06 -203.08 -0.02
5 0.8328 9068.75 0.20 -189.46 -0.04
6 0.8845 8186.43 0.15 -116.97 -0.03
7 0.8846 8184.73 0.02 -116.83 0.04
8 0.8847 8182.19 -0.02 -116.61 0.14
9 0.8900 8069.65 -0.21 -110.78 0.03
10 0.8900 8068.13 -0.15 -110.67 0.08
11 0.8902 8065.80 0.08 -110.58 0.06
12 0.8902 8063.69 -0.12 -110.61 -0.05
13 2.9951 15902.56 -0.00 -196.58 -0.05
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.
17DF165 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.661 42.707 42.616 ecceobj 0.061 0.059 0.063 incobj 3.703 3.703 3.703 qmin 39.645 39.808 39.561 qmax 46.270 46.339 46.351 amean 42.877 42.923 42.832 amin 42.538 42.590 42.501 amax 43.221 43.283 43.178 emean 0.051 0.050 0.052 emin 0.028 0.029 0.030 emax 0.071 0.071 0.074 imean 1.578 1.612 1.543 imin 0.425 0.503 0.341 imax 2.615 2.619 2.602 excite_mean 0.059 0.058 0.060 fracstop 1.000 1.000 1.000 cjmean 3.084 3.085 3.083 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 195.7 194.9 197.0 kozaiamp 180.0 180.0 179.9