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: 17DB170
# Created Mon Apr 28 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting 13 observations of 13
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000087 0.027113 -0.000002 -0.000093 0.025332 0.000000
# Chi-squared of fit: 2.59 DOF: 20 RMS: 0.08
# Min/Max residuals: -0.26 0.15
# Exact a, adot, b, bdot, g, gdot:
1.671452E-05 2.698995E-02 2.723674E-07 -9.483389E-05 2.555062E-02 -6.077600E-04
# Covariance matrix:
7.3311E-13 -9.6295E-13 -2.2907E-15 2.9765E-15 -2.9869E-13 -8.8151E-12
-9.6295E-13 2.6573E-12 -5.9814E-15 -6.3836E-15 -3.4295E-13 2.8872E-11
-2.2907E-15 -5.9814E-15 2.8727E-13 -1.3849E-13 1.0475E-14 -8.0328E-14
2.9765E-15 -6.3836E-15 -1.3849E-13 1.1026E-13 -1.2228E-15 -6.9665E-14
-2.9869E-13 -3.4295E-13 1.0475E-14 -1.2228E-15 9.8345E-13 -5.1015E-12
-8.8151E-12 2.8872E-11 -8.0328E-14 -6.9665E-14 -5.1015E-12 3.2886E-10
# lat0 lon0 xBary yBary zBary JD0
4.291604 -172.994286 -0.135506 0.073984 -0.984143 2457482.957870
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 353.50781 +/- 0.234
Argument of Peri: 101.68355 +/- 0.316
Long of Asc Node: 94.21204 +/- 0.010
Inclination: 4.19145 +/- 0.000
Eccentricity: 0.14145337 +/- 0.0001
Semi-Major Axis: 46.67097776 +/- 0.0114
Time of Perihelion: 2459580.6832 +/- 75.8
Perihelion: 40.06921080 +/- 0.0115
Aphelion: 53.27274473 +/- 0.0143
Period (y) 318.8442 +/- 0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.70358278 +/- 0.0015
Ecliptic Y -5.01778742 +/- 0.0002
Ecliptic Z 2.92884108 +/- 0.0001
Ecliptic XDOT 0.00041657 +/- 0.0000
Ecliptic YDOT -0.00286964 +/- 0.0000
Ecliptic ZDOT -0.00001500 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 40.12643501 +/- 0.0015
Geocenter to KBO 39.13799352 +/- 0.0015
# Hcoef: 8.67
The following table shows the complete astrometric record for 17DB170. 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 (17DB170) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.457081 12 32 30.73 +01 09 42.8 17DB170 T09 C~86v4 2016 04 04.491423 12 32 30.57 +01 09 43.8 17DB170 T09 C~86v4 2017 02 21.56614 12 41 12.01 +00 12 07.7 24.3z 17DB170 T09 C~86v4 2017 02 21.59574 12 41 11.90 +00 12 08.5 24.3z 17DB170 T09 C~86v4 2017 02 21.61448 12 41 11.85 +00 12 09.0 24.2z 17DB170 T09 C~86v4 2017 02 23.54142 12 41 05.15 +00 13 00.1 25.3r 17DB170 T09 C~86v4 2017 02 23.61010 12 41 04.89 +00 13 01.9 24.6r 17DB170 T09 C~86v4 2017 02 23.62285 12 41 04.83 +00 13 02.4 24.5r 17DB170 T09 C~86v4 2017 02 23.65247 12 41 04.74 +00 13 03.1 25.0r 17DB170 T09 C~86v4 2017 04 27.392208 12 36 32.85 +00 42 27.7 17DB170 T09 C~86v4 2019 04 03.453429 12 49 43.83 -00 42 24.1 17DB170 T09 C~86v4 2019 04 03.477581 12 49 43.72 -00 42 23.5 17DB170 T09 C~86v4 2019 04 06.460461 12 49 29.88 -00 40 56.8 17DB170 T09 C~86v4
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 -0.07
2 0.0001 -2.60 0.00 -0.03 -0.05
3 0.8846 8552.43 0.04 -84.51 -0.01
4 0.8847 8550.60 -0.06 -84.43 -0.02
5 0.8848 8549.71 0.15 -84.26 0.08
6 0.8900 8437.01 0.13 -77.05 0.07
7 0.8902 8432.70 -0.01 -76.94 -0.03
8 0.8903 8431.68 -0.26 -76.83 0.03
9 0.8903 8430.16 0.01 -76.72 0.05
10 1.0621 3982.37 -0.00 -67.64 0.01
11 2.9952 16930.61 -0.09 -55.28 -0.01
12 2.9953 16928.84 0.01 -55.38 -0.08
13 3.0034 16702.40 0.09 -57.77 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.
17DB170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 46.103 46.143 46.064 ecceobj 0.130 0.131 0.130 incobj 4.190 4.190 4.190 qmin 39.496 39.518 39.479 qmax 53.597 53.662 53.519 amean 46.355 46.395 46.316 amin 45.963 46.008 45.936 amax 46.791 46.844 46.760 emean 0.131 0.132 0.131 emin 0.118 0.119 0.117 emax 0.145 0.146 0.145 imean 2.461 2.465 2.457 imin 1.996 1.998 1.992 imax 2.969 2.962 2.973 excite_mean 0.138 0.139 0.137 fracstop 1.000 1.000 1.000 cjmean 3.107 3.107 3.107 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 189.1 188.5 189.6 kozaiamp 179.9 180.0 180.0