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: 17DG170
# Created Tue Apr 1 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000054 0.024433 -0.000001 0.000045 0.024365 0.000000
# Chi-squared of fit: 10.62 DOF: 30 RMS: 0.14
# Min/Max residuals: -0.32 0.28
# Exact a, adot, b, bdot, g, gdot:
1.539823E-05 2.433542E-02 2.329931E-07 4.330034E-05 2.456957E-02 -9.103529E-04
# Covariance matrix:
2.4378E-13 -3.2309E-13 -2.4409E-17 -4.4292E-16 -1.0075E-13 -3.3020E-12
-3.2309E-13 1.1629E-12 -3.7546E-15 1.6890E-15 -1.6308E-13 1.4973E-11
-2.4409E-17 -3.7546E-15 1.5846E-13 -9.0339E-14 3.9958E-15 -5.3140E-14
-4.4292E-16 1.6890E-15 -9.0339E-14 1.0647E-13 2.3187E-17 2.3945E-14
-1.0075E-13 -1.6308E-13 3.9958E-15 2.3187E-17 5.7344E-13 -2.2992E-12
-3.3020E-12 1.4973E-11 -5.3140E-14 2.3945E-14 -2.2992E-12 2.1222E-10
# lat0 lon0 xBary yBary zBary JD0
4.314050 -171.879050 -0.116321 0.074553 -0.986552 2457482.960707
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 323.39454 +/- 0.494
Argument of Peri: 129.39935 +/- 0.568
Long of Asc Node: 99.43705 +/- 0.010
Inclination: 4.21225 +/- 0.000
Eccentricity: 0.05472297 +/- 0.0003
Semi-Major Axis: 43.55558702 +/- 0.0065
Time of Perihelion: 2468156.4768 +/- 144.1
Perihelion: 41.17209577 +/- 0.0157
Aphelion: 45.93907828 +/- 0.0160
Period (y) 287.4577 +/- 0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.14514646 +/- 0.0012
Ecliptic Y -5.99082592 +/- 0.0002
Ecliptic Z 3.06168577 +/- 0.0001
Ecliptic XDOT 0.00048370 +/- 0.0000
Ecliptic YDOT -0.00267721 +/- 0.0000
Ecliptic ZDOT -0.00000281 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.69156979 +/- 0.0012
Geocenter to KBO 40.70075868 +/- 0.0013
# Hcoef: 9.45
The following table shows the complete astrometric record for 17DG170. 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 (17DG170) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.459918 12 36 38.16 +00 44 38.2 17DG170 T09 C~89UX 2016 04 04.48066 12 36 38.06 +00 44 38.7 25.9g 17DG170 T09 C~8COu 2016 04 04.52590 12 36 37.84 +00 44 40.2 26.3g 17DG170 T09 C~8COu 2016 04 04.555772 12 36 37.73 +00 44 41.0 17DG170 T09 C~89UX 2016 04 05.456299 12 36 33.69 +00 45 06.1 17DG170 T09 C~89UX 2016 04 05.515208 12 36 33.42 +00 45 07.7 17DG170 T09 C~89UX 2017 02 21.49884 12 44 41.41 -00 08 16.4 25.9z 17DG170 T09 C~89UX 2017 02 21.52038 12 44 41.34 -00 08 16.1 25.8z 17DG170 T09 C~89UX 2017 02 21.59574 12 44 41.07 -00 08 14.4 24.9z 17DG170 T09 C~89UX 2017 02 23.54421 12 44 34.58 -00 07 24.0 25.4r 17DG170 T09 C~89UX 2017 02 23.56973 12 44 34.49 -00 07 23.3 25.1r 17DG170 T09 C~89UX 2017 02 23.61219 12 44 34.33 -00 07 22.3 25.3r 17DG170 T09 C~89UX 2017 02 23.64192 12 44 34.22 -00 07 21.3 25.9r 17DG170 T09 C~89UX 2017 02 23.65456 12 44 34.17 -00 07 21.3 25.9r 17DG170 T09 C~89UX 2017 04 27.380876 12 40 09.74 +00 21 22.0 17DG170 T09 C~89UX 2017 04 27.392208 12 40 09.70 +00 21 22.2 17DG170 T09 C~89UX 2019 04 06.350099 12 52 00.99 -00 53 43.7 17DG170 T09 C~89UX 2019 04 06.460461 12 52 00.49 -00 53 40.6 17DG170 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 -0.04
2 0.0001 -1.58 0.02 -0.13 -0.15
3 0.0002 -5.20 -0.26 -0.05 -0.02
4 0.0003 -7.03 0.11 0.03 0.10
5 0.0027 -72.61 0.04 -0.76 -0.10
6 0.0029 -76.97 0.04 -0.88 -0.16
7 0.8844 7916.92 -0.01 -62.34 0.18
8 0.8845 7915.83 0.12 -62.48 -0.03
9 0.8847 7911.43 -0.02 -62.52 -0.32
10 0.8900 7801.94 0.14 -54.54 0.24
11 0.8901 7800.42 0.11 -54.43 0.27
12 0.8902 7797.82 -0.01 -54.46 0.11
13 0.8903 7795.91 -0.19 -54.19 0.28
14 0.8903 7795.22 -0.15 -54.48 -0.06
15 1.0621 3467.27 -0.05 -33.27 -0.08
16 1.0621 3466.64 0.05 -33.33 -0.09
17 3.0031 15074.40 -0.06 28.10 -0.09
18 3.0034 15066.24 0.06 28.00 -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.
17DG170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.083 43.104 43.062 ecceobj 0.046 0.046 0.047 incobj 4.211 4.211 4.211 qmin 40.685 40.694 40.655 qmax 46.108 46.171 46.133 amean 43.307 43.328 43.286 amin 42.971 43.002 42.952 amax 43.647 43.685 43.628 emean 0.039 0.038 0.039 emin 0.020 0.020 0.020 emax 0.057 0.057 0.058 imean 2.453 2.458 2.446 imin 1.581 1.592 1.565 imax 3.236 3.234 3.241 excite_mean 0.058 0.058 0.058 fracstop 1.000 1.000 1.000 cjmean 3.089 3.089 3.089 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 190.0 190.8 189.8 kozaiamp 180.0 180.0 180.0