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: 17DE168
# Created Mon Apr 28 01:11:06 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 21 observations of 21
# Arc: 8.16y
# First observation: 2011/02/04
# Last observation: 2019/04/03
# Chi-squared of fit: 6.83 DOF: 36 RMS: 0.10
# Min/Max residuals: -0.19 0.19
# Exact a, adot, b, bdot, g, gdot:
1.255279E-05 1.314468E-02 -5.233371E-06 -6.679574E-03 1.744055E-02 -8.301936E-03
# Covariance matrix:
4.7518E-13 -1.2967E-13 -2.2918E-14 3.2049E-14 -3.8750E-14 -6.3308E-13
-1.2967E-13 1.1616E-13 3.6370E-14 -5.1706E-14 1.6288E-13 1.0155E-12
-2.2918E-14 3.6370E-14 4.4948E-13 -8.9161E-14 3.5799E-14 3.7639E-13
3.2049E-14 -5.1706E-14 -8.9161E-14 4.0069E-14 -5.7083E-14 -5.3003E-13
-3.8750E-14 1.6288E-13 3.5799E-14 -5.7083E-14 9.0202E-13 1.0789E-12
-6.3308E-13 1.0155E-12 3.7639E-13 -5.3003E-13 1.0789E-12 1.0444E-11
# lat0 lon0 xBary yBary zBary JD0
7.316899 -175.514199 0.748695 0.082323 -0.641148 2455596.983847
# Heliocentric elements and errors
Epoch: 2455596.5000 = 2011/02/04
Mean Anomaly: 335.69719 +/- 0.023
Argument of Peri: 251.38960 +/- 0.014
Long of Asc Node: 17.54062 +/- 0.000
Inclination: 28.02435 +/- 0.000
Eccentricity: 0.59778875 +/- 0.0003
Semi-Major Axis: 93.10083581 +/- 0.0568
Time of Perihelion: 2477746.9607 +/- 280.6
Perihelion: 37.44620350 +/- 0.0335
Aphelion: 148.75546813 +/- 0.0940
Period (y) 898.3355 +/- 0.82
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -57.39534325 +/- 0.0031
Ecliptic Y -3.75334985 +/- 0.0002
Ecliptic Z 7.30204596 +/- 0.0004
Ecliptic XDOT 0.00131582 +/- 0.0000
Ecliptic YDOT -0.00196042 +/- 0.0000
Ecliptic ZDOT -0.00120600 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 57.98002930 +/- 0.0031
Geocenter to KBO 57.33808219 +/- 0.0031
# Hcoef: 7.27
The following table shows the complete astrometric record for 17DE168. 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 (17DE168) followed by the observatory code and reference code for the source of the astrometry.
2011 02 04.483081 12 28 05.78 +04 55 58.7 17DE168 T14 C~8ScG 2011 02 04.531324 12 28 05.70 +04 55 59.5 17DE168 T14 C~8ScG 2011 02 04.597260 12 28 05.57 +04 56 00.7 17DE168 T14 C~8ScG 2016 04 01.286317 12 36 29.19 +01 48 31.4 17DE168 T09 C~8ScG 2016 04 01.305734 12 36 29.12 +01 48 31.7 17DE168 T09 C~8ScG 2016 04 01.369437 12 36 28.87 +01 48 33.0 17DE168 T09 C~8ScG 2016 04 01.389474 12 36 28.80 +01 48 33.5 17DE168 T09 C~8ScG 2017 02 21.50560 12 41 01.96 +00 53 09.0 24.5z 17DE168 T09 C~86uz 2017 02 21.50898 12 41 01.96 +00 53 09.3 24.2z 17DE168 T09 C~86uz 2017 02 21.52849 12 41 01.90 +00 53 09.7 24.3z 17DE168 T09 C~86uz 2017 02 21.54193 12 41 01.86 +00 53 09.8 24.1z 17DE168 T09 C~86uz 2017 02 21.57429 12 41 01.77 +00 53 10.5 24.5z 17DE168 T09 C~86uz 2017 02 21.61448 12 41 01.67 +00 53 11.0 24.4z 17DE168 T09 C~86uz 2017 02 23.55566 12 40 56.21 +00 53 43.8 24.7r 17DE168 T09 C~86uz 2017 02 23.62285 12 40 56.02 +00 53 44.8 25.1r 17DE168 T09 C~86uz 2017 02 23.65247 12 40 55.93 +00 53 45.5 25.0r 17DE168 T09 C~86uz 2017 03 04.552427 12 40 29.00 +00 56 24.2 17DE168 T09 C~8ScG 2017 03 04.609439 12 40 28.82 +00 56 25.3 17DE168 T09 C~8ScG 2017 04 02.487843 12 38 47.75 +01 05 33.1 17DE168 T09 C~8ScG 2019 04 03.450757 12 43 37.30 -00 23 09.0 17DE168 T09 C~8ScG 2019 04 03.474913 12 43 37.21 -00 23 08.5 17DE168 T09 C~8ScG
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 -0.19 0.00 -0.10
2 0.0001 0.00 0.08 0.00 -0.04
3 0.0003 0.00 0.14 0.00 0.14
4 5.1548 0.00 0.06 0.00 -0.08
5 5.1549 0.00 0.07 0.00 -0.14
6 5.1551 0.00 -0.18 0.00 -0.00
7 5.1551 0.00 -0.12 0.00 0.13
8 6.0480 0.00 -0.07 0.00 -0.16
9 6.0480 0.00 0.07 0.00 0.08
10 6.0480 0.00 -0.00 0.00 0.16
11 6.0481 0.00 -0.03 0.00 0.03
12 6.0482 0.00 -0.01 0.00 0.19
13 6.0483 0.00 0.19 0.00 0.02
14 6.0536 0.00 -0.13 0.00 -0.00
15 6.0538 0.00 -0.05 0.00 -0.15
16 6.0539 0.00 -0.11 0.00 0.04
17 6.0782 0.00 0.05 0.00 -0.02
18 6.0784 0.00 0.13 0.00 0.03
19 6.1574 0.00 0.04 0.00 -0.06
20 8.1587 0.00 -0.03 0.00 -0.04
21 8.1588 0.00 -0.02 0.00 0.01
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.
17DE168 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 92.675 92.673 92.676 ecceobj 0.596 0.596 0.596 incobj 28.055 28.055 28.055 qmin 36.621 36.581 36.577 qmax 155.139 154.922 155.000 amean 93.815 93.793 93.816 amin 92.127 92.116 92.116 amax 96.559 96.514 96.406 emean 0.592 0.590 0.591 emin 0.576 0.572 0.575 emax 0.610 0.610 0.610 imean 28.705 28.794 28.722 imin 27.733 27.695 27.720 imax 29.591 29.915 29.646 excite_mean 0.762 0.762 0.762 fracstop 1.000 1.000 1.000 cjmean 2.817 2.817 2.817 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 202.6 184.7 195.4 kozaiamp 180.0 180.0 180.0