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: 17DF170
# Created Sun Dec 22 02:10:58 2024
# Orbit generated from Bernstein formalism
# Fitting 15 observations of 15
# Arc: 1.06y
# First observation: 2016/04/04
# Last observation: 2017/04/27
Preliminary a, adot, b, bdot, g, gdot:
-0.000001 0.034460 0.000001 -0.006727 0.029726 0.000000
# Chi-squared of fit: 12.23 DOF: 24 RMS: 0.16
# Min/Max residuals: -0.27 0.33
# Exact a, adot, b, bdot, g, gdot:
1.851562E-05 3.453550E-02 -3.698484E-06 -6.744255E-03 2.987432E-02 -1.862552E-03
# Covariance matrix:
3.1803E-13 3.7134E-12 9.8726E-15 -7.7534E-13 2.6788E-12 1.2010E-10
3.7134E-12 6.5796E-10 1.6209E-12 -1.2699E-10 4.4545E-10 1.9681E-08
9.8726E-15 1.6209E-12 2.9524E-13 -6.2748E-13 1.0996E-12 4.8535E-11
-7.7534E-13 -1.2699E-10 -6.2748E-13 2.5043E-11 -8.6101E-11 -3.8020E-09
2.6788E-12 4.4545E-10 1.0996E-12 -8.6101E-11 3.0300E-10 1.3346E-08
1.2010E-10 1.9681E-08 4.8535E-11 -3.8020E-09 1.3346E-08 5.8925E-07
# lat0 lon0 xBary yBary zBary JD0
4.203606 -171.744981 -0.114365 0.072666 -0.986926 2457482.981437
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 350.50024 +/- 3.957
Argument of Peri: 174.89108 +/- 6.497
Long of Asc Node: 28.48573 +/- 0.004
Inclination: 11.76703 +/- 0.002
Eccentricity: 0.22478816 +/- 0.0075
Semi-Major Axis: 44.16850963 +/- 0.1999
Time of Perihelion: 2460309.7912 +/- 1178.4
Perihelion: 34.23995146 +/- 0.3656
Aphelion: 54.09706781 +/- 0.4118
Period (y) 293.5468 +/- 1.99
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -34.00424200 +/- 0.0193
Ecliptic Y -5.05112379 +/- 0.0028
Ecliptic Z 2.45355578 +/- 0.0014
Ecliptic XDOT 0.00057819 +/- 0.0001
Ecliptic YDOT -0.00312128 +/- 0.0000
Ecliptic ZDOT -0.00062892 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 34.46479742 +/- 0.0190
Geocenter to KBO 33.47356980 +/- 0.0195
# Hcoef: 9.97
The following table shows the complete astrometric record for 17DF170. 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 (17DF170) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.480648 12 36 57.22 +00 35 23.2 17DF170 T09 C~89UX 2016 04 04.525888 12 36 56.99 +00 35 24.3 17DF170 T09 C~89UX 2016 04 05.456299 12 36 51.97 +00 35 52.0 17DF170 T09 C~89UX 2016 04 05.515207 12 36 51.65 +00 35 53.7 17DF170 T09 C~89UX 2016 04 05.574240 12 36 51.32 +00 35 55.5 17DF170 T09 C~89UX 2017 02 21.49208 12 47 07.27 -00 53 39.3 24.2z 17DF170 T09 C~89UX 2017 02 21.51504 12 47 07.17 -00 53 39.3 24.7z 17DF170 T09 C~89UX 2017 02 21.53924 12 47 07.07 -00 53 38.6 24.8z 17DF170 T09 C~89UX 2017 02 21.56076 12 47 07.02 -00 53 38.1 25.4z 17DF170 T09 C~89UX 2017 02 23.53285 12 46 59.22 -00 52 47.5 25.8r 17DF170 T09 C~89UX 2017 02 23.56973 12 46 59.09 -00 52 46.3 25.8r 17DF170 T09 C~89UX 2017 02 23.60376 12 46 58.93 -00 52 45.3 25.8r 17DF170 T09 C~89UX 2017 02 23.64401 12 46 58.75 -00 52 44.3 25.4r 17DF170 T09 C~89UX 2017 04 27.380876 12 41 41.95 -00 22 45.9 17DF170 T09 C~89UX 2017 04 27.426120 12 41 41.73 -00 22 44.9 17DF170 T09 C~89UX
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 0.03
2 0.0001 -3.60 0.29 -0.35 -0.09
3 0.0027 -83.72 -0.06 -4.53 0.03
4 0.0028 -88.81 -0.02 -4.85 0.01
5 0.0030 -94.06 -0.16 -5.15 0.02
6 0.8844 10524.08 -0.20 -1309.53 0.32
7 0.8844 10522.70 -0.09 -1310.12 -0.27
8 0.8845 10521.04 -0.18 -1310.07 -0.21
9 0.8845 10520.15 0.33 -1309.90 -0.04
10 0.8899 10392.36 0.08 -1309.41 -0.16
11 0.8900 10390.09 0.29 -1309.07 0.19
12 0.8901 10387.48 -0.03 -1309.10 0.18
13 0.8902 10384.60 -0.20 -1309.24 0.05
14 1.0620 5300.93 -0.01 -1526.11 -0.00
15 1.0621 5297.50 0.01 -1526.49 -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.
17DF170 quality flag:2 Type: 7:4EEE SCATNEAR 7:4EEE axisobj 43.619 43.835 43.593 ecceobj 0.215 0.219 0.214 incobj 11.809 11.802 11.809 qmin 33.549 31.802 33.706 qmax 54.483 58.503 54.417 amean 43.726 43.492 43.726 amin 43.221 42.125 43.236 amax 44.311 45.718 44.271 emean 0.211 0.223 0.206 emin 0.190 0.177 0.174 emax 0.232 0.281 0.230 imean 11.404 8.754 11.711 imin 10.237 4.692 10.234 imax 12.258 11.662 13.121 excite_mean 0.290 0.272 0.289 fracstop 1.000 1.000 1.000 cjmean 2.997 3.008 2.997 libcent 0 178.9 -180.0 181.7 libamp 0 135.5 -180.0 126.0 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 187.2 187.1 199.2 kozaiamp 180.0 180.0 180.0