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: 17DS164
# Created Sun Dec 22 02:10:57 2024
# Orbit generated from Bernstein formalism
# Fitting 20 observations of 20
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000120 0.022429 -0.000081 0.007359 0.023556 0.000000
# Chi-squared of fit: 6.27 DOF: 34 RMS: 0.10
# Min/Max residuals: -0.20 0.28
# Exact a, adot, b, bdot, g, gdot:
1.451166E-05 2.215774E-02 4.574261E-06 7.260224E-03 2.377505E-02 -3.184145E-03
# Covariance matrix:
6.9705E-13 -8.4691E-13 1.2320E-13 -2.2266E-13 -3.4578E-13 -9.0389E-12
-8.4691E-13 2.1500E-12 -3.9647E-13 6.9161E-13 -2.2745E-13 2.7944E-11
1.2320E-13 -3.9647E-13 3.0223E-13 -2.8350E-13 7.3189E-14 -5.5651E-12
-2.2266E-13 6.9161E-13 -2.8350E-13 3.8165E-13 -1.1329E-13 9.6834E-12
-3.4578E-13 -2.2745E-13 7.3189E-14 -1.1329E-13 8.1444E-13 -4.4990E-12
-9.0389E-12 2.7944E-11 -5.5651E-12 9.6834E-12 -4.4990E-12 3.9112E-10
# lat0 lon0 xBary yBary zBary JD0
4.040987 -171.967707 -0.117551 0.069841 -0.986747 2457482.943323
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 306.65414 +/- 0.090
Argument of Peri: 81.35783 +/- 0.181
Long of Asc Node: 176.27236 +/- 0.001
Inclination: 18.47757 +/- 0.001
Eccentricity: 0.15127241 +/- 0.0008
Semi-Major Axis: 46.46926999 +/- 0.0081
Time of Perihelion: 2474625.8137 +/- 28.6
Perihelion: 39.43975169 +/- 0.0361
Aphelion: 53.49878829 +/- 0.0367
Period (y) 316.7794 +/- 0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.51147770 +/- 0.0016
Ecliptic Y -6.11989362 +/- 0.0002
Ecliptic Z 2.96425802 +/- 0.0001
Ecliptic XDOT 0.00077718 +/- 0.0000
Ecliptic YDOT -0.00247422 +/- 0.0000
Ecliptic ZDOT 0.00080815 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.05189496 +/- 0.0016
Geocenter to KBO 42.06090311 +/- 0.0016
# Hcoef: 7.74
The following table shows the complete astrometric record for 17DS164. 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 (17DS164) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.442534 12 35 52.84 +00 31 40.0 17DS164 T09 C~83F2 2016 04 04.555772 12 35 52.34 +00 31 43.6 17DS164 T09 C~83F2 2017 02 21.49546 12 44 00.62 +00 02 12.7 23.6z 17DS164 T09 C~81Bw 2017 02 21.49884 12 44 00.62 +00 02 12.7 23.7z 17DS164 T09 C~81Bw 2017 02 21.54460 12 44 00.49 +00 02 14.1 23.6z 17DS164 T09 C~81Bw 2017 02 21.56614 12 44 00.40 +00 02 14.8 23.6z 17DS164 T09 C~81Bw 2017 02 21.59574 12 44 00.31 +00 02 15.4 23.8z 17DS164 T09 C~81Bw 2017 02 21.60643 12 44 00.27 +00 02 15.8 23.7z 17DS164 T09 C~81Bw 2017 02 21.61716 12 44 00.24 +00 02 16.1 23.8z 17DS164 T09 C~81Bw 2017 02 23.54142 12 43 54.10 +00 03 12.2 24.6r 17DS164 T09 C~81Bw 2017 02 23.54421 12 43 54.08 +00 03 12.2 24.7r 17DS164 T09 C~81Bw 2017 02 23.57824 12 43 53.97 +00 03 13.0 24.5r 17DS164 T09 C~81Bw 2017 02 23.61219 12 43 53.86 +00 03 14.2 24.4r 17DS164 T09 C~81Bw 2017 02 23.65456 12 43 53.72 +00 03 15.2 24.1r 17DS164 T09 C~81Bw 2017 03 04.55244 12 43 22.68 +00 07 45.8 23.4y 17DS164 T09 C~81Bw 2017 03 04.55518 12 43 22.67 +00 07 46.0 23.7y 17DS164 T09 C~81Bw 2017 03 04.59585 12 43 22.51 +00 07 47.2 23.6y 17DS164 T09 C~81Bw 2017 04 27.392208 12 39 40.97 +00 35 22.8 17DS164 T09 C~83F2 2019 04 03.429182 12 52 09.80 +00 09 06.2 17DS164 T09 C~83F2 2019 04 06.473958 12 51 56.58 +00 10 42.8 17DS164 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 0.05 0.00 0.05
2 0.0003 -8.31 -0.07 0.35 0.06
3 0.8845 7424.37 -0.11 1258.91 0.00
4 0.8845 7424.37 0.08 1258.91 -0.02
5 0.8846 7422.03 0.28 1259.43 0.15
6 0.8847 7420.51 -0.04 1259.54 0.10
7 0.8847 7419.03 0.13 1259.56 -0.10
8 0.8848 7418.32 0.02 1259.69 -0.05
9 0.8848 7417.78 0.09 1259.79 -0.03
10 0.8901 7310.89 -0.00 1275.06 0.13
11 0.8901 7310.62 -0.12 1274.94 -0.01
12 0.8902 7308.78 0.01 1275.02 -0.17
13 0.8903 7306.79 -0.03 1275.48 0.03
14 0.8904 7304.46 0.07 1275.57 -0.19
15 0.9147 6769.28 -0.10 1340.78 -0.07
16 0.9148 6769.06 -0.14 1340.91 0.03
17 0.9149 6766.38 -0.20 1341.06 -0.07
18 1.0621 3057.56 0.09 1552.99 0.09
19 2.9952 14025.36 -0.04 4538.98 -0.00
20 3.0035 13803.99 0.03 4549.43 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.
17DS164 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 45.939 45.960 45.919 ecceobj 0.146 0.147 0.146 incobj 18.575 18.576 18.575 qmin 38.815 38.815 38.820 qmax 53.911 53.984 53.881 amean 46.204 46.224 46.189 amin 45.826 45.832 45.805 amax 46.632 46.675 46.619 emean 0.143 0.143 0.143 emin 0.131 0.131 0.131 emax 0.157 0.158 0.157 imean 18.306 18.304 18.297 imin 17.917 17.920 17.920 imax 18.600 18.595 18.562 excite_mean 0.345 0.345 0.345 fracstop 1.000 1.000 1.000 cjmean 2.980 2.980 2.980 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 177.5 177.3 177.1 kozaiamp 180.0 180.0 180.0