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: 17DQ171
# Created Mon Apr 28 01:11:07 2025
# Orbit generated from Bernstein formalism
# Fitting 14 observations of 14
# Arc: 2.99y
# First observation: 2016/04/05
# Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
-0.000041 0.029548 -0.000022 0.003418 0.026531 0.000000
# Chi-squared of fit: 4.34 DOF: 22 RMS: 0.10
# Min/Max residuals: -0.18 0.17
# Exact a, adot, b, bdot, g, gdot:
1.764929E-05 2.952651E-02 1.782365E-06 3.412019E-03 2.699939E-02 8.394878E-04
# Covariance matrix:
6.1980E-13 -1.7981E-12 8.8198E-14 -1.9388E-13 2.2888E-13 -1.7644E-11
-1.7981E-12 7.8460E-12 -4.1577E-13 8.9214E-13 -1.5219E-12 8.0874E-11
8.8198E-14 -4.1577E-13 2.4265E-13 -1.6890E-13 8.8256E-14 -4.3528E-12
-1.9388E-13 8.9214E-13 -1.6890E-13 2.3155E-13 -1.7594E-13 9.3488E-12
2.2888E-13 -1.5219E-12 8.8256E-14 -1.7594E-13 5.9533E-13 -1.5754E-11
-1.7644E-11 8.0874E-11 -4.3528E-12 9.3488E-12 -1.5754E-11 8.4762E-10
# lat0 lon0 xBary yBary zBary JD0
3.844397 -174.452401 -0.177345 0.065872 -0.978324 2457483.945084
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 8.69401 +/- 0.235
Argument of Peri: 17.19860 +/- 0.345
Long of Asc Node: 156.23063 +/- 0.003
Inclination: 7.55143 +/- 0.001
Eccentricity: 0.17651332 +/- 0.0005
Semi-Major Axis: 46.00336150 +/- 0.0213
Time of Perihelion: 2454728.1710 +/- 74.4
Perihelion: 37.88315548 +/- 0.0300
Aphelion: 54.12356752 +/- 0.0350
Period (y) 312.0273 +/- 0.22
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -37.74394679 +/- 0.0011
Ecliptic Y -3.84651543 +/- 0.0001
Ecliptic Z 2.48337829 +/- 0.0001
Ecliptic XDOT 0.00022813 +/- 0.0000
Ecliptic YDOT -0.00299304 +/- 0.0000
Ecliptic ZDOT 0.00035093 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 38.02063082 +/- 0.0010
Geocenter to KBO 37.03787100 +/- 0.0011
# Hcoef: 9.55
The following table shows the complete astrometric record for 17DQ171. 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 (17DQ171) followed by the observatory code and reference code for the source of the astrometry.
2016 04 05.444295 12 26 27.59 +01 19 34.8 17DQ171 T09 C~89Ua 2016 04 05.562321 12 26 27.03 +01 19 38.4 17DQ171 T09 C~89Ua 2016 06 05.320049 12 23 07.54 +01 39 02.9 17DQ171 T09 C~89Ua 2016 06 05.332736 12 23 07.54 +01 39 03.1 17DQ171 T09 C~89Ua 2017 01 30.62076 12 37 13.41 +00 17 27.4 24.5z 17DQ171 T09 C~89Ua 2017 01 30.62613 12 37 13.40 +00 17 27.4 25.5z 17DQ171 T09 C~89Ua 2017 01 30.65099 12 37 13.36 +00 17 28.1 24.9z 17DQ171 T09 C~89Ua 2017 02 02.612845 12 37 07.36 +00 18 30.5 17DQ171 T09 C~89Ua 2017 02 02.658456 12 37 07.25 +00 18 31.4 17DQ171 T09 C~89Ua 2017 02 23.53862 12 36 04.77 +00 27 40.8 25.6r 17DQ171 T09 C~89Ua 2017 02 23.57615 12 36 04.62 +00 27 41.8 25.7r 17DQ171 T09 C~89Ua 2017 02 23.62075 12 36 04.47 +00 27 43.2 25.4r 17DQ171 T09 C~89Ua 2019 04 03.426507 12 46 13.67 -00 10 17.6 17DQ171 T09 C~89Ua 2019 04 03.450756 12 46 13.54 -00 10 16.9 17DQ171 T09 C~89Ua
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 -0.07 0.00 0.04
2 0.0003 -9.14 0.09 -0.02 -0.02
3 0.1667 -3217.35 -0.08 -114.78 -0.12
4 0.1667 -3217.43 0.06 -114.60 0.12
5 0.8218 10379.00 -0.16 417.80 -0.08
6 0.8219 10378.86 -0.10 417.74 -0.18
7 0.8219 10378.03 -0.05 418.15 0.06
8 0.8300 10270.39 0.17 439.75 0.14
9 0.8302 10268.52 0.11 439.93 0.01
10 0.8873 9187.90 -0.05 572.64 0.06
11 0.8874 9185.44 -0.09 572.67 -0.09
12 0.8875 9182.81 0.17 573.06 0.08
13 2.9924 18519.69 0.06 2110.81 0.07
14 2.9925 18517.60 -0.06 2110.68 -0.07
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.
17DQ171 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 45.460 45.537 45.383 ecceobj 0.167 0.168 0.165 incobj 7.579 7.579 7.578 qmin 37.185 37.223 37.245 qmax 54.597 54.700 54.368 amean 45.687 45.783 45.610 amin 45.297 45.368 45.213 amax 46.151 46.247 46.051 emean 0.168 0.172 0.166 emin 0.153 0.159 0.151 emax 0.184 0.184 0.182 imean 6.792 6.982 6.792 imin 6.078 6.386 6.061 imax 7.662 7.671 7.670 excite_mean 0.205 0.211 0.204 fracstop 1.000 1.000 1.000 cjmean 3.071 3.069 3.071 libcent 0 -180.0 -180.0 177.0 libamp 0 -180.0 -180.0 176.8 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 177.0 174.9 178.0 kozaiamp 180.0 179.9 180.0