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: 17DB165
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
-0.000021 0.024334 -0.000001 0.000080 0.024350 0.000000
# Chi-squared of fit: 8.09 DOF: 30 RMS: 0.12
# Min/Max residuals: -0.30 0.27
# Exact a, adot, b, bdot, g, gdot:
1.576624E-05 2.440473E-02 2.201224E-09 7.806729E-05 2.450314E-02 1.566054E-03
# Covariance matrix:
7.3305E-13 -9.6495E-13 3.5772E-16 -2.3642E-15 -3.1192E-13 -9.8131E-12
-9.6495E-13 1.9568E-12 -7.6088E-15 6.0863E-15 8.1802E-14 2.3228E-11
3.5772E-16 -7.6088E-15 2.9322E-13 -2.2669E-13 6.2740E-15 -1.0789E-13
-2.3642E-15 6.0863E-15 -2.2669E-13 2.4366E-13 -2.9711E-16 8.2940E-14
-3.1192E-13 8.1802E-14 6.2740E-15 -2.9711E-16 6.3251E-13 6.6129E-13
-9.8131E-12 2.3228E-11 -1.0789E-13 8.2940E-14 6.6129E-13 3.1527E-10
# lat0 lon0 xBary yBary zBary JD0
4.706873 -172.197102 -0.121762 0.081261 -0.985364 2457482.957870
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 44.26168 +/- 0.185
Argument of Peri: 35.74863 +/- 0.255
Long of Asc Node: 100.15793 +/- 0.014
Inclination: 4.59857 +/- 0.000
Eccentricity: 0.09001099 +/- 0.0007
Semi-Major Axis: 44.47367580 +/- 0.0116
Time of Perihelion: 2444161.2929 +/- 55.5
Perihelion: 40.47055614 +/- 0.0318
Aphelion: 48.47679546 +/- 0.0325
Period (y) 296.5943 +/- 0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.26356436 +/- 0.0013
Ecliptic Y -5.77962404 +/- 0.0002
Ecliptic Z 3.34891141 +/- 0.0001
Ecliptic XDOT 0.00019827 +/- 0.0000
Ecliptic YDOT -0.00273217 +/- 0.0000
Ecliptic ZDOT 0.00002306 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.80072973 +/- 0.0013
Geocenter to KBO 40.81108789 +/- 0.0013
# Hcoef: 7.71
The following table shows the complete astrometric record for 17DB165. 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 (17DB165) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.457081 12 36 05.36 +01 13 47.7 17DB165 T09 C~86uy 2016 04 04.525888 12 36 05.05 +01 13 49.7 17DB165 T09 C~86uy 2017 02 21.49884 12 44 08.08 +00 20 53.9 23.6z 17DB165 T09 C~81Bx 2017 02 21.50898 12 44 08.03 +00 20 53.9 23.7z 17DB165 T09 C~81Bx 2017 02 21.54460 12 44 07.93 +00 20 55.0 23.1z 17DB165 T09 C~81Bx 2017 02 21.59574 12 44 07.76 +00 20 56.2 23.7z 17DB165 T09 C~81Bx 2017 02 21.61716 12 44 07.67 +00 20 57.1 23.9z 17DB165 T09 C~81Bx 2017 02 23.55846 12 44 01.19 +00 21 47.3 24.2r 17DB165 T09 C~81Bx 2017 02 23.57824 12 44 01.12 +00 21 48.0 24.0r 17DB165 T09 C~81Bx 2017 02 23.61219 12 44 01.02 +00 21 48.6 24.0r 17DB165 T09 C~81Bx 2017 02 23.65456 12 44 00.85 +00 21 49.6 23.6r 17DB165 T09 C~81Bx 2017 03 04.55244 12 43 28.48 +00 25 52.5 24.4y 17DB165 T09 C~81Bx 2017 03 04.55518 12 43 28.47 +00 25 52.7 23.7y 17DB165 T09 C~81Bx 2017 03 04.59585 12 43 28.31 +00 25 53.9 23.8y 17DB165 T09 C~81Bx 2017 03 04.64731 12 43 28.11 +00 25 55.2 23.3y 17DB165 T09 C~81Bx 2017 04 27.392208 12 39 37.82 +00 50 27.7 17DB165 T09 C~86uy 2017 04 27.417363 12 39 37.71 +00 50 28.2 17DB165 T09 C~86uy 2019 04 03.477681 12 51 37.14 -00 25 17.5 17DB165 T09 C~86uy
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 -0.00 0.00 0.01
2 0.0002 -5.06 0.01 0.01 0.10
3 0.8844 7908.78 0.12 -60.67 0.09
4 0.8845 7908.09 0.00 -60.96 -0.25
5 0.8846 7906.27 0.20 -60.55 0.04
6 0.8847 7903.45 0.27 -60.45 -0.05
7 0.8848 7901.85 -0.12 -60.15 0.16
8 0.8901 7792.58 -0.12 -52.38 -0.06
9 0.8901 7791.33 -0.20 -52.15 0.10
10 0.8902 7789.72 0.16 -52.19 -0.06
11 0.8903 7786.97 -0.12 -52.28 -0.30
12 0.9147 7244.27 -0.04 -20.67 -0.05
13 0.9147 7244.05 -0.08 -20.55 0.06
14 0.9148 7241.37 -0.10 -20.39 0.11
15 0.9150 7238.10 -0.01 -20.38 -0.01
16 1.0621 3480.57 0.08 -30.11 0.08
17 1.0622 3478.86 -0.03 -30.30 -0.01
18 2.9953 15215.25 0.00 51.45 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.
17DB165 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.999 44.037 43.962 ecceobj 0.084 0.086 0.082 incobj 4.597 4.597 4.597 qmin 39.378 39.278 39.382 qmax 49.335 49.459 49.237 amean 44.210 44.247 44.173 amin 43.849 43.885 43.815 amax 44.597 44.640 44.552 emean 0.091 0.093 0.089 emin 0.074 0.076 0.072 emax 0.107 0.108 0.106 imean 3.037 3.038 3.035 imin 2.253 2.256 2.248 imax 3.764 3.759 3.763 excite_mean 0.105 0.107 0.104 fracstop 1.000 1.000 1.000 cjmean 3.091 3.091 3.090 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 175.6 175.4 175.4 kozaiamp 179.8 180.0 179.9