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: 17DM170
# Created Tue Apr 1 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 17
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
0.000016 0.024285 -0.000005 0.000879 0.024064 0.000000
# Chi-squared of fit: 8.30 DOF: 28 RMS: 0.12
# Min/Max residuals: -0.25 0.33
# Exact a, adot, b, bdot, g, gdot:
1.643834E-05 2.425745E-02 4.410857E-07 8.766298E-04 2.446581E-02 3.278779E-04
# Covariance matrix:
2.9261E-13 -4.4728E-13 4.5964E-15 -1.2521E-14 -8.8441E-14 -4.7609E-12
-4.4728E-13 1.4969E-11 -2.8328E-13 5.3025E-13 -7.3036E-12 2.0072E-10
4.5964E-15 -2.8328E-13 1.7786E-13 -1.0895E-13 1.4403E-13 -3.8267E-12
-1.2521E-14 5.3025E-13 -1.0895E-13 1.3330E-13 -2.6050E-13 7.1646E-12
-8.8441E-14 -7.3036E-12 1.4403E-13 -2.6050E-13 4.1932E-12 -9.8562E-11
-4.7609E-12 2.0072E-10 -3.8267E-12 7.1646E-12 -9.8562E-11 2.7121E-09
# lat0 lon0 xBary yBary zBary JD0
3.115132 -172.507902 -0.127495 0.053818 -0.986524 2457482.979329
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 17.80831 +/- 1.892
Argument of Peri: 36.21477 +/- 2.123
Long of Asc Node: 131.74405 +/- 0.011
Inclination: 3.67024 +/- 0.000
Eccentricity: 0.05215564 +/- 0.0013
Semi-Major Axis: 44.03873152 +/- 0.0333
Time of Perihelion: 2452200.0503 +/- 561.1
Perihelion: 41.74186345 +/- 0.0651
Aphelion: 46.33559959 +/- 0.0669
Period (y) 292.2540 +/- 0.33
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.43114938 +/- 0.0034
Ecliptic Y -5.57953645 +/- 0.0004
Ecliptic Z 2.22121409 +/- 0.0002
Ecliptic XDOT 0.00032303 +/- 0.0000
Ecliptic YDOT -0.00270242 +/- 0.0000
Ecliptic ZDOT 0.00009996 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.86412734 +/- 0.0034
Geocenter to KBO 40.87335813 +/- 0.0034
# Hcoef: 8.87
The following table shows the complete astrometric record for 17DM170. 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 (17DM170) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.47854 12 32 26.34 -00 06 38.3 25.0g 17DM170 T09 C~8COu 2016 04 04.51309 12 32 26.19 -00 06 37.5 25.5g 17DM170 T09 C~8COu 2016 04 04.54301 12 32 26.05 -00 06 36.6 25.8g 17DM170 T09 C~8COu 2016 04 05.446303 12 32 22.06 -00 06 10.9 17DM170 T09 C~89UY 2016 04 05.564262 12 32 21.53 -00 06 07.6 17DM170 T09 C~89UY 2017 01 30.653664 12 41 28.79 -01 04 21.6 17DM170 T09 C~89UY 2017 01 30.667823 12 41 28.77 -01 04 21.2 17DM170 T09 C~89UY 2017 02 02.664746 12 41 23.16 -01 03 30.9 17DM170 T09 C~89UY 2017 02 21.53656 12 40 32.45 -00 56 45.6 25.3z 17DM170 T09 C~89UY 2017 02 21.55809 12 40 32.38 -00 56 45.4 24.8z 17DM170 T09 C~89UY 2017 02 21.58500 12 40 32.28 -00 56 44.6 25.4z 17DM170 T09 C~89UY 2017 02 21.60643 12 40 32.22 -00 56 44.3 24.6z 17DM170 T09 C~89UY 2017 02 23.52726 12 40 25.74 -00 55 55.9 24.9r 17DM170 T09 C~89UY 2017 02 23.60167 12 40 25.48 -00 55 54.1 24.9r 17DM170 T09 C~89UY 2017 02 23.64192 12 40 25.34 -00 55 52.7 24.9r 17DM170 T09 C~89UY 2019 04 03.445387 12 48 09.45 -01 37 51.7 17DM170 T09 C~89UY 2019 04 03.469560 12 48 09.34 -01 37 50.9 17DM170 T09 C~89UY
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 -0.16 0.00 0.03
2 0.0001 -2.38 0.00 -0.15 -0.11
3 0.0002 -4.67 -0.09 -0.15 -0.10
4 0.0026 -69.80 0.11 -0.14 -0.05
5 0.0030 -78.41 0.14 -0.24 -0.09
6 0.8246 8848.04 0.02 24.89 -0.13
7 0.8246 8847.61 0.03 25.14 0.06
8 0.8328 8750.28 0.07 38.24 -0.06
9 0.8845 7890.18 -0.25 111.11 0.33
10 0.8845 7889.13 -0.07 110.88 0.04
11 0.8846 7887.44 -0.23 111.02 0.11
12 0.8847 7886.49 0.04 110.94 -0.03
13 0.8899 7777.94 0.13 117.13 -0.02
14 0.8901 7773.64 0.19 117.25 -0.10
15 0.8902 7771.15 0.06 117.71 0.26
16 2.9951 15184.32 0.02 543.99 -0.12
17 2.9952 15182.48 -0.02 544.08 -0.02
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.
17DM170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.567 43.680 43.457 ecceobj 0.042 0.047 0.038 incobj 3.677 3.677 3.676 qmin 40.873 40.806 40.939 qmax 46.924 47.166 46.582 amean 43.780 43.896 43.677 amin 43.434 43.551 43.340 amax 44.137 44.253 44.032 emean 0.046 0.051 0.041 emin 0.028 0.035 0.023 emax 0.063 0.067 0.060 imean 2.698 2.686 2.722 imin 1.922 1.948 1.974 imax 3.422 3.384 3.463 excite_mean 0.066 0.069 0.063 fracstop 1.000 1.000 1.000 cjmean 3.094 3.095 3.093 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 178.5 179.9 179.5 kozaiamp 180.0 179.9 179.9