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: 17DH170
# Created Tue Apr 1 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 21
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000110 0.026783 0.000005 -0.001172 0.025301 0.000000
# Chi-squared of fit: 11.85 DOF: 36 RMS: 0.13
# Min/Max residuals: -0.36 0.31
# Exact a, adot, b, bdot, g, gdot:
1.593889E-05 2.657825E-02 -1.127558E-06 -1.165089E-03 2.553988E-02 -1.660462E-03
# Covariance matrix:
3.6619E-13 -4.8102E-13 -8.2791E-15 1.7511E-14 -1.5083E-13 -4.4720E-12
-4.8102E-13 1.3419E-12 2.0661E-14 -5.6852E-14 -1.3859E-13 1.4920E-11
-8.2791E-15 2.0661E-14 1.6841E-13 -7.9720E-14 2.5913E-15 2.3559E-13
1.7511E-14 -5.6852E-14 -7.9720E-14 6.5808E-14 7.1728E-15 -6.6455E-13
-1.5083E-13 -1.3859E-13 2.5913E-15 7.1728E-15 5.4263E-13 -2.2180E-12
-4.4720E-12 1.4920E-11 2.3559E-13 -6.6455E-13 -2.2180E-12 1.7479E-10
# lat0 lon0 xBary yBary zBary JD0
4.917563 -172.007400 -0.118537 0.084918 -0.985450 2457482.960707
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 336.01590 +/- 0.177
Argument of Peri: 148.60026 +/- 0.238
Long of Asc Node: 70.34017 +/- 0.005
Inclination: 5.41954 +/- 0.000
Eccentricity: 0.12720129 +/- 0.0002
Semi-Major Axis: 45.25897679 +/- 0.0064
Time of Perihelion: 2464889.7879 +/- 54.7
Perihelion: 39.50197678 +/- 0.0106
Aphelion: 51.01597680 +/- 0.0116
Period (y) 304.4846 +/- 0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.59807382 +/- 0.0011
Ecliptic Y -5.68179201 +/- 0.0002
Ecliptic Z 3.35639904 +/- 0.0001
Ecliptic XDOT 0.00056131 +/- 0.0000
Ecliptic YDOT -0.00280530 +/- 0.0000
Ecliptic ZDOT -0.00013969 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 40.14418545 +/- 0.0011
Geocenter to KBO 39.15444499 +/- 0.0011
# Hcoef: 8.91
The following table shows the complete astrometric record for 17DH170. 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 (17DH170) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.459918 12 37 07.00 +01 20 56.6 17DH170 T09 C~89UX 2016 04 04.49143 12 37 06.84 +01 20 57.4 26.0g 17DH170 T09 C~8COu 2016 04 04.49356 12 37 06.83 +01 20 57.6 25.8g 17DH170 T09 C~8COu 2016 04 04.525888 12 37 06.68 +01 20 58.5 17DH170 T09 C~89UX 2017 02 21.49884 12 45 37.91 +00 20 48.1 25.4z 17DH170 T09 C~89UX 2017 02 21.56614 12 45 37.66 +00 20 50.0 24.2z 17DH170 T09 C~89UX 2017 02 21.57695 12 45 37.62 +00 20 50.0 24.3z 17DH170 T09 C~89UX 2017 02 21.59574 12 45 37.56 +00 20 50.2 24.4z 17DH170 T09 C~89UX 2017 02 21.59841 12 45 37.56 +00 20 50.7 25.2z 17DH170 T09 C~89UX 2017 02 23.55846 12 45 30.82 +00 21 41.9 24.9r 17DH170 T09 C~89UX 2017 02 23.58033 12 45 30.73 +00 21 42.4 24.5r 17DH170 T09 C~89UX 2017 02 23.61219 12 45 30.62 +00 21 43.2 24.6r 17DH170 T09 C~89UX 2017 02 23.62494 12 45 30.58 +00 21 44.1 24.8r 17DH170 T09 C~89UX 2017 02 23.65456 12 45 30.46 +00 21 44.8 24.4r 17DH170 T09 C~89UX 2017 04 27.392208 12 40 57.17 +00 50 43.1 17DH170 T09 C~89UX 2017 04 27.417363 12 40 57.07 +00 50 43.5 17DH170 T09 C~89UX 2019 04 03.489035 12 53 50.60 -00 39 47.5 17DH170 T09 C~89UX 2019 04 06.350099 12 53 37.20 -00 38 25.6 17DH170 T09 C~89UX 2019 04 06.44937 12 53 36.71 -00 38 22.7 24.9i 17DH170 T09 C~8COu 2019 04 06.46047 12 53 36.66 -00 38 22.3 24.8i 17DH170 T09 C~8COu 2019 04 06.515104 12 53 36.41 -00 38 20.8 17DH170 T09 C~89UX
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 0.11 0.00 0.08
2 0.0001 -2.52 -0.01 -0.21 -0.06
3 0.0001 -2.74 -0.07 -0.09 0.06
4 0.0002 -5.16 -0.03 -0.14 0.07
5 0.8844 8469.49 0.18 -294.67 0.10
6 0.8846 8465.29 -0.12 -294.41 0.14
7 0.8846 8464.74 -0.04 -294.64 -0.13
8 0.8847 8463.83 0.14 -294.82 -0.36
9 0.8847 8463.63 0.10 -294.36 0.09
10 0.8901 8350.35 0.09 -287.19 -0.09
11 0.8901 8348.91 -0.04 -287.26 -0.23
12 0.8902 8347.07 0.04 -287.18 -0.25
13 0.8903 8346.17 -0.11 -286.58 0.31
14 0.8903 8344.23 -0.27 -286.65 0.14
15 1.0621 3887.73 -0.06 -306.03 0.08
16 1.0622 3886.19 0.07 -306.25 -0.02
17 2.9953 16726.42 0.17 -721.22 0.02
18 3.0031 16508.02 0.11 -725.22 -0.02
19 3.0034 16500.07 -0.15 -725.45 -0.05
20 3.0034 16499.22 -0.14 -725.38 0.05
21 3.0036 16495.15 0.02 -725.48 0.06
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.
17DH170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.721 44.743 44.700 ecceobj 0.117 0.117 0.117 incobj 5.423 5.423 5.423 qmin 38.962 38.972 38.893 qmax 51.265 51.351 51.281 amean 44.969 44.990 44.947 amin 44.592 44.618 44.578 amax 45.366 45.398 45.352 emean 0.116 0.116 0.116 emin 0.102 0.102 0.102 emax 0.131 0.131 0.131 imean 3.748 3.749 3.746 imin 3.147 3.157 3.134 imax 4.331 4.326 4.340 excite_mean 0.134 0.134 0.134 fracstop 1.000 1.000 1.000 cjmean 3.091 3.092 3.091 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 181.9 182.0 182.1 kozaiamp 179.9 180.0 180.0