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: 17DW165
# Created Sun Apr 27 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 15 observations of 16
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
0.000025 0.029777 0.000036 -0.004584 0.026525 0.000000
# Chi-squared of fit: 5.01 DOF: 24 RMS: 0.10
# Min/Max residuals: -0.20 0.24
# Exact a, adot, b, bdot, g, gdot:
1.744759E-05 2.946613E-02 -3.206863E-06 -4.534563E-03 2.711591E-02 -2.783365E-03
# Covariance matrix:
7.2600E-13 -8.5722E-13 -5.1670E-14 9.7536E-14 -3.5269E-13 -6.8657E-12
-8.5722E-13 1.2090E-11 8.8319E-13 -1.8878E-12 -6.9021E-12 1.3357E-10
-5.1670E-14 8.8319E-13 3.6372E-13 -3.5904E-13 -5.0686E-13 9.9502E-12
9.7536E-14 -1.8878E-12 -3.5904E-13 5.3947E-13 1.1072E-12 -2.1279E-11
-3.5269E-13 -6.9021E-12 -5.0686E-13 1.1072E-12 5.3537E-12 -7.8402E-11
-6.8657E-12 1.3357E-10 9.9502E-12 -2.1279E-11 -7.8402E-11 1.5056E-09
# lat0 lon0 xBary yBary zBary JD0
3.822588 -172.581442 -0.128392 0.065989 -0.985664 2457482.957870
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 338.43796 +/- 0.283
Argument of Peri: 188.95353 +/- 0.448
Long of Asc Node: 30.48984 +/- 0.002
Inclination: 9.50206 +/- 0.001
Eccentricity: 0.19557297 +/- 0.0004
Semi-Major Axis: 45.89724880 +/- 0.0199
Time of Perihelion: 2464282.9547 +/- 89.1
Perihelion: 36.92098758 +/- 0.0234
Aphelion: 54.87351003 +/- 0.0293
Period (y) 310.9483 +/- 0.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -37.45538396 +/- 0.0031
Ecliptic Y -5.00863518 +/- 0.0004
Ecliptic Z 2.45851812 +/- 0.0002
Ecliptic XDOT 0.00063206 +/- 0.0000
Ecliptic YDOT -0.00292496 +/- 0.0000
Ecliptic ZDOT -0.00047556 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 37.86867472 +/- 0.0031
Geocenter to KBO 36.87872148 +/- 0.0031
# Hcoef: 8.92
The following table shows the complete astrometric record for 17DW165. 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 (17DW165) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.457081 12 33 17.12 +00 34 06.3 17DW165 T09 C~83F3 2016 04 04.523778 12 33 16.79 +00 34 08.0 17DW165 T09 C~83F3 2017 02 02.664746 12 43 14.41 -00 46 43.8 17DW165 T09 C~83F3 2017 02 21.49546 12 42 19.21 -00 40 14.1 24.4z 17DW165 T09 C~83F3 2017 02 21.53656 12 42 19.05 -00 40 13.1 24.1z 17DW165 T09 C~83F3 2017 02 21.58500 12 42 18.87 -00 40 12.1 23.6z 17DW165 T09 C~83F3 2017 02 21.60643 12 42 18.79 -00 40 11.4 23.8z 17DW165 T09 C~83F3 2017 02 23.53005 12 42 11.66 -00 39 23.7 25.1r 17DW165 T09 C~83F3 2017 02 23.54142 12 42 11.63 -00 39 23.5 24.6r 17DW165 T09 C~83F3 2017 02 23.56973 12 42 11.53 -00 39 23.0 25.2r 17DW165 T09 C~83F3 2017 02 23.61219 12 42 11.35 -00 39 21.7 25.2r 17DW165 T09 C~83F3 2017 02 23.64192 12 42 11.21 -00 39 21.0 25.3r 17DW165 T09 C~83F3 2017 03 04.54160 12 41 35.23 -00 35 25.8 24.1y 17DW165 T09 C~83F3 2017 03 04.58243 12 41 35.04 -00 35 24.8 24.4y 17DW165 T09 C~83F3 2017 03 04.63107 12 41 34.83 -00 35 23.1 24.9y 17DW165 T09 C~83F3 2019 04 06.501697 12 50 44.81 -02 09 34.9 17DW165 T09 C~83F3
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 0.12
2 0.0002 -5.22 0.07 -0.39 -0.02
3 0.8329 10154.14 -0.00 -923.02 -0.06
4 0.8844 9237.59 0.01 -891.33 0.05
5 0.8845 9234.98 -0.08 -891.36 0.01
6 0.8847 9232.10 0.01 -891.50 -0.16
7 0.8847 9230.72 -0.06 -891.33 0.01
8 0.8900 9113.40 0.01 -889.67 0.01
9 0.8900 9112.90 0.24 -889.66 0.02
10 0.8901 9111.33 ( 0.45) -889.79 ( -0.12)
11 0.8902 9108.33 0.14 -889.66 -0.00
12 0.8903 9106.12 -0.19 -889.85 -0.20
13 0.9147 8516.35 0.08 -886.54 0.07
14 0.9148 8513.33 -0.03 -886.74 -0.11
15 0.9149 8509.76 -0.14 -886.42 0.23
16 3.0035 18361.15 0.01 -2838.59 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.
17DW165 quality flag:2 Type: CLASSICAL CLASSICAL SCATNEAR axisobj 45.321 45.400 45.243 ecceobj 0.186 0.185 0.186 incobj 9.538 9.538 9.538 qmin 35.908 36.110 36.009 qmax 55.826 55.794 55.546 amean 45.595 45.646 45.487 amin 45.174 45.243 45.039 amax 46.080 46.141 46.009 emean 0.192 0.191 0.185 emin 0.175 0.174 0.167 emax 0.212 0.210 0.208 imean 8.755 8.762 8.600 imin 7.760 7.778 7.712 imax 9.854 9.696 9.579 excite_mean 0.245 0.244 0.238 fracstop 1.000 1.000 1.000 cjmean 3.047 3.048 3.050 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 179.8 181.0 186.2 kozaiamp 179.9 179.9 180.0