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: 17DC165
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 17
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000063 0.018613 -0.000003 0.000463 0.021040 0.000000
# Chi-squared of fit: 12.49 DOF: 28 RMS: 0.15
# Min/Max residuals: -0.32 0.32
# Exact a, adot, b, bdot, g, gdot:
1.379884E-05 1.851674E-02 8.208225E-07 4.597454E-04 2.116496E-02 -1.297460E-03
# Covariance matrix:
4.8833E-13 -6.4215E-13 5.5918E-15 -1.2572E-14 -2.2909E-13 -8.6074E-12
-6.4215E-13 1.5276E-12 -2.0430E-14 3.6117E-14 1.1796E-14 2.4326E-11
5.5918E-15 -2.0430E-14 2.1952E-13 -1.3225E-13 4.9259E-15 -3.6219E-13
-1.2572E-14 3.6117E-14 -1.3225E-13 1.3170E-13 -1.3978E-15 6.3111E-13
-2.2909E-13 1.1796E-14 4.9259E-15 -1.3978E-15 6.1166E-13 -5.6183E-13
-8.6074E-12 2.4326E-11 -3.6219E-13 6.3111E-13 -5.6183E-13 4.2460E-10
# lat0 lon0 xBary yBary zBary JD0
3.423514 -171.042093 -0.101555 0.059309 -0.989209 2457482.943323
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 234.92588 +/- 0.416
Argument of Peri: 199.95118 +/- 0.413
Long of Asc Node: 121.82714 +/- 0.016
Inclination: 3.63505 +/- 0.000
Eccentricity: 0.08618997 +/- 0.0008
Semi-Major Axis: 45.76388911 +/- 0.0062
Time of Perihelion: 2496767.4020 +/- 130.4
Perihelion: 41.81950095 +/- 0.0392
Aphelion: 49.70827726 +/- 0.0394
Period (y) 309.5940 +/- 0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -47.55507981 +/- 0.0017
Ecliptic Y -7.60111019 +/- 0.0003
Ecliptic Z 2.82152776 +/- 0.0001
Ecliptic XDOT 0.00054209 +/- 0.0000
Ecliptic YDOT -0.00234641 +/- 0.0000
Ecliptic ZDOT 0.00004935 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 48.24130503 +/- 0.0017
Geocenter to KBO 47.24790117 +/- 0.0017
# Hcoef: 7.78
The following table shows the complete astrometric record for 17DC165. 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 (17DC165) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.442534 12 38 18.34 -00 24 11.8 17DC165 T09 C~86uy 2016 04 04.515201 12 38 18.04 -00 24 10.1 17DC165 T09 C~86uy 2016 04 04.545119 12 38 17.93 -00 24 09.3 17DC165 T09 C~86uy 2017 02 21.51504 12 44 49.39 -01 05 20.8 24.3z 17DC165 T09 C~81Bx 2017 02 21.56076 12 44 49.25 -01 05 20.3 23.7z 17DC165 T09 C~81Bx 2017 02 21.60109 12 44 49.12 -01 05 19.1 24.5z 17DC165 T09 C~81Bx 2017 02 21.60643 12 44 49.12 -01 05 19.1 25.0z 17DC165 T09 C~81Bx 2017 02 23.56973 12 44 43.28 -01 04 35.3 24.4r 17DC165 T09 C~81Bx 2017 02 23.60376 12 44 43.20 -01 04 35.1 24.5r 17DC165 T09 C~81Bx 2017 02 23.64192 12 44 43.07 -01 04 34.0 25.3r 17DC165 T09 C~81Bx 2017 03 04.58243 12 44 14.24 -01 01 04.6 24.6y 17DC165 T09 C~81Bx 2017 03 04.58510 12 44 14.23 -01 01 04.5 24.0y 17DC165 T09 C~81Bx 2017 03 04.63382 12 44 14.06 -01 01 03.3 24.2y 17DC165 T09 C~81Bx 2017 04 27.380876 12 40 50.19 -00 39 05.7 17DC165 T09 C~86uy 2017 04 27.426120 12 40 50.03 -00 39 04.9 17DC165 T09 C~86uy 2019 04 06.460461 12 50 08.00 -01 34 43.8 17DC165 T09 C~86uy 2019 04 06.501697 12 50 07.85 -01 34 42.8 17DC165 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 0.01 0.00 -0.10
2 0.0002 -4.81 -0.06 -0.20 -0.26
3 0.0003 -6.64 0.06 -0.12 -0.16
4 0.8845 6365.64 0.07 33.25 0.32
5 0.8846 6363.51 0.22 32.89 -0.16
6 0.8848 6361.24 -0.04 33.23 0.07
7 0.8848 6361.24 0.22 33.23 0.06
8 0.8901 6263.40 -0.32 39.13 0.24
9 0.8902 6262.22 0.25 38.84 -0.13
10 0.8903 6259.99 -0.02 39.09 0.02
11 0.9148 5779.71 -0.13 61.92 0.12
12 0.9148 5779.53 -0.15 61.95 0.14
13 0.9150 5776.71 -0.17 62.06 0.15
14 1.0621 2445.81 -0.01 72.86 0.02
15 1.0622 2443.29 0.06 72.65 -0.09
16 3.0035 11461.84 -0.12 286.65 -0.14
17 3.0036 11459.37 0.13 286.68 -0.08
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.
17DC165 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 45.285 45.303 45.267 ecceobj 0.094 0.093 0.094 incobj 3.638 3.638 3.638 qmin 40.660 40.689 40.600 qmax 50.718 50.685 50.744 amean 45.541 45.558 45.523 amin 45.174 45.183 45.150 amax 45.942 45.954 45.933 emean 0.091 0.090 0.091 emin 0.077 0.076 0.077 emax 0.104 0.104 0.105 imean 2.338 2.338 2.340 imin 1.849 1.851 1.849 imax 2.858 2.854 2.866 excite_mean 0.100 0.099 0.100 fracstop 1.000 1.000 1.000 cjmean 3.108 3.109 3.108 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 183.5 183.8 182.8 kozaiamp 179.9 180.0 180.0