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: 17DL170
# Created Sun Dec 22 02:10:58 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 25 observations of 25
# Arc: 5.10y
# First observation: 2014/02/28
# Last observation: 2019/04/06
# Chi-squared of fit: 5.81 DOF: 44 RMS: 0.09
# Min/Max residuals: -0.16 0.25
# Exact a, adot, b, bdot, g, gdot:
1.167878E-05 1.625424E-02 1.413280E-06 1.898117E-03 2.087407E-02 -4.843422E-04
# Covariance matrix:
3.5416E-13 -2.1712E-13 1.4400E-14 -1.8209E-14 -7.2244E-14 -1.9738E-12
-2.1712E-13 2.4068E-13 -2.0937E-14 2.6426E-14 1.8523E-13 2.8706E-12
1.4400E-14 -2.0937E-14 2.5516E-13 -7.8496E-14 -1.5296E-14 -2.8782E-13
-1.8209E-14 2.6426E-14 -7.8496E-14 3.2899E-14 1.9043E-14 3.6355E-13
-7.2244E-14 1.8523E-13 -1.5296E-14 1.9043E-14 5.6939E-13 2.1020E-12
-1.9738E-12 2.8706E-12 -2.8782E-13 3.6355E-13 2.1020E-12 3.9458E-11
# lat0 lon0 xBary yBary zBary JD0
4.372937 -171.847668 0.469655 0.066430 -0.867517 2456717.082781
# Heliocentric elements and errors
Epoch: 2456716.5000 = 2014/02/28
Mean Anomaly: 190.46903 +/- 0.071
Argument of Peri: 206.21450 +/- 0.068
Long of Asc Node: 155.02795 +/- 0.003
Inclination: 7.94194 +/- 0.000
Eccentricity: 0.24120014 +/- 0.0001
Semi-Major Axis: 39.38132614 +/- 0.0036
Time of Perihelion: 2499225.4610 +/- 18.9
Perihelion: 29.88254488 +/- 0.0043
Aphelion: 48.88010739 +/- 0.0056
Period (y) 247.1404 +/- 0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -48.21326086 +/- 0.0017
Ecliptic Y -6.43049962 +/- 0.0003
Ecliptic Z 3.65284294 +/- 0.0001
Ecliptic XDOT 0.00037805 +/- 0.0000
Ecliptic YDOT -0.00210166 +/- 0.0000
Ecliptic ZDOT 0.00024352 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 48.77719978 +/- 0.0017
Geocenter to KBO 47.90636132 +/- 0.0017
# Hcoef: 7.84
The following table shows the complete astrometric record for 17DL170. 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 (17DL170) followed by the observatory code and reference code for the source of the astrometry.
2014 02 28.582003 12 36 50.63 +00 47 08.7 17DL170 T09 C~89UY 2014 02 28.599717 12 36 50.56 +00 47 09.2 17DL170 T09 C~89UY 2014 02 28.624111 12 36 50.48 +00 47 09.8 17DL170 T09 C~89UY 2014 02 28.641225 12 36 50.41 +00 47 10.3 17DL170 T09 C~89UY 2016 04 04.445379 12 41 50.84 +00 30 38.7 17DL170 T09 C~89UY 2016 04 04.482759 12 41 50.68 +00 30 39.8 17DL170 T09 C~89UY 2016 04 04.528005 12 41 50.50 +00 30 40.9 17DL170 T09 C~89UY 2016 04 04.557901 12 41 50.38 +00 30 41.7 17DL170 T09 C~89UY 2016 04 06.599635 12 41 42.29 +00 31 34.6 17DL170 T09 C~89UY 2016 04 06.605250 12 41 42.28 +00 31 34.6 17DL170 T09 C~89UY 2017 02 21.52305 12 48 01.52 -00 03 57.7 24.1z 17DL170 T09 C~89UY 2017 02 21.53924 12 48 01.46 -00 03 57.4 24.5z 17DL170 T09 C~89UY 2017 02 21.54460 12 48 01.45 -00 03 57.0 24.3z 17DL170 T09 C~89UY 2017 02 21.56882 12 48 01.38 -00 03 56.7 24.4z 17DL170 T09 C~89UY 2017 02 21.59841 12 48 01.28 -00 03 55.8 24.0z 17DL170 T09 C~89UY 2017 02 21.60910 12 48 01.26 -00 03 55.7 24.5z 17DL170 T09 C~89UY 2017 02 23.54421 12 47 55.57 -00 03 09.5 25.1r 17DL170 T09 C~89UY 2017 02 23.58033 12 47 55.47 -00 03 08.7 25.0r 17DL170 T09 C~89UY 2017 02 23.61428 12 47 55.38 -00 03 07.8 25.1r 17DL170 T09 C~89UY 2017 02 23.64401 12 47 55.27 -00 03 07.1 24.9r 17DL170 T09 C~89UY 2017 04 27.395922 12 44 02.07 +00 23 27.1 17DL170 T09 C~89UY 2017 04 27.408451 12 44 02.02 +00 23 27.4 17DL170 T09 C~89UY 2019 04 03.477581 12 52 51.77 -00 18 42.5 17DL170 T09 C~89UY 2019 04 06.449359 12 52 39.92 -00 17 24.6 17DL170 T09 C~89UY 2019 04 06.528515 12 52 39.60 -00 17 22.6 17DL170 T09 C~89UY
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 0.12 0.00 -0.05
2 0.0000 0.00 -0.02 0.00 -0.00
3 0.0001 0.00 0.02 0.00 -0.03
4 0.0002 0.00 -0.16 0.00 0.04
5 2.0968 0.00 0.11 0.00 -0.11
6 2.0969 0.00 -0.03 0.00 0.01
7 2.0970 0.00 0.01 0.00 -0.06
8 2.0971 0.00 0.01 0.00 -0.04
9 2.1027 0.00 -0.14 0.00 0.11
10 2.1027 0.00 0.05 0.00 -0.03
11 2.9814 0.00 0.13 0.00 0.06
12 2.9814 0.00 -0.06 0.00 -0.03
13 2.9814 0.00 0.03 0.00 0.25
14 2.9815 0.00 0.05 0.00 -0.03
15 2.9816 0.00 -0.14 0.00 0.17
16 2.9816 0.00 0.04 0.00 0.02
17 2.9869 0.00 -0.15 0.00 0.00
18 2.9870 0.00 0.00 0.00 -0.07
19 2.9871 0.00 0.21 0.00 0.01
20 2.9872 0.00 -0.08 0.00 -0.00
21 3.1590 0.00 -0.03 0.00 -0.05
22 3.1590 0.00 -0.10 0.00 -0.01
23 5.0921 0.00 0.02 0.00 -0.09
24 5.1003 0.00 -0.03 0.00 0.02
25 5.1005 0.00 -0.02 0.00 -0.04
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.
17DL170 quality flag:3 Type: 3:2E 3:2E 3:2E axisobj 39.181 39.181 39.181 ecceobj 0.248 0.248 0.248 incobj 7.973 7.973 7.973 qmin 28.865 28.865 28.865 qmax 50.794 50.795 50.794 amean 39.456 39.456 39.456 amin 38.959 38.959 38.958 amax 40.023 40.022 40.024 emean 0.242 0.242 0.242 emin 0.201 0.201 0.201 emax 0.270 0.270 0.270 imean 7.126 7.125 7.126 imin 5.383 5.383 5.383 imax 10.056 10.057 10.055 excite_mean 0.273 0.273 0.273 fracstop 1.000 1.000 1.000 cjmean 2.967 2.967 2.967 libcent 0 179.2 179.2 179.1 libamp 0 100.0 100.0 100.0 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 289.2 289.2 289.2 kozaiamp 82.7 82.7 82.7