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: 17DK171
# Created Sun Nov 24 02:10:50 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 22 observations of 22
# Arc: 15.04y
# First observation: 2004/03/20
# Last observation: 2019/04/06
# Chi-squared of fit: 11.39 DOF: 38 RMS: 0.13
# Min/Max residuals: -0.31 0.25
# Exact a, adot, b, bdot, g, gdot:
1.416175E-05 2.214913E-02 3.162930E-07 3.474254E-04 2.341337E-02 1.304071E-04
# Covariance matrix:
7.3419E-13 -1.0620E-13 6.9834E-16 -8.6153E-16 -4.7337E-14 -1.6733E-13
-1.0620E-13 7.7358E-14 -9.6776E-16 1.1470E-15 2.1282E-14 2.2631E-13
6.9834E-16 -9.6776E-16 6.9174E-13 -5.2102E-14 -3.6035E-17 -3.0007E-15
-8.6153E-16 1.1470E-15 -5.2102E-14 4.3274E-15 4.9188E-16 3.5519E-15
-4.7337E-14 2.1282E-14 -3.6035E-17 4.9188E-16 4.2472E-13 6.1745E-14
-1.6733E-13 2.2631E-13 -3.0007E-15 3.5519E-15 6.1745E-14 7.0119E-13
# lat0 lon0 xBary yBary zBary JD0
4.316589 174.947064 -0.092357 0.074421 -0.985266 2453084.988189
# Heliocentric elements and errors
Epoch: 2453084.5000 = 2004/03/20
Mean Anomaly: 111.42089 +/- 0.489
Argument of Peri: 325.70008 +/- 0.477
Long of Asc Node: 96.94496 +/- 0.002
Inclination: 4.31070 +/- 0.000
Eccentricity: 0.00971508 +/- 0.0000
Semi-Major Axis: 43.54192318 +/- 0.0048
Time of Perihelion: 2420603.9071 +/- 142.5
Perihelion: 43.11890989 +/- 0.0051
Aphelion: 43.96493648 +/- 0.0051
Period (y) 287.3225 +/- 0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -43.42011226 +/- 0.0012
Ecliptic Y 3.74785776 +/- 0.0001
Ecliptic Z 3.21475412 +/- 0.0001
Ecliptic XDOT -0.00024365 +/- 0.0000
Ecliptic YDOT -0.00258568 +/- 0.0000
Ecliptic ZDOT 0.00004180 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.69996255 +/- 0.0012
Geocenter to KBO 42.71066697 +/- 0.0012
# Hcoef: 7.73
The following table shows the complete astrometric record for 17DK171. 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 (17DK171) followed by the observatory code and reference code for the source of the astrometry.
2004 03 20.487446 11 48 19.56 +05 58 08.7 17DK171 T14 C~89Ua 2004 03 20.503150 11 48 19.47 +05 58 09.3 17DK171 T14 C~89Ua 2016 04 04.445379 12 43 20.15 +00 07 41.1 17DK171 T09 C~89Ua 2016 04 04.48277 12 43 19.98 +00 07 42.1 25.4g 17DK171 T09 C~8COu 2016 04 04.51733 12 43 19.84 +00 07 43.0 25.2g 17DK171 T09 C~8COu 2016 04 04.560026 12 43 19.65 +00 07 44.2 17DK171 T09 C~89Ua 2017 02 21.50220 12 50 45.20 -00 41 21.2 23.5z 17DK171 T09 C~89Ua 2017 02 21.51771 12 50 45.15 -00 41 20.7 23.0z 17DK171 T09 C~89Ua 2017 02 21.53924 12 50 45.09 -00 41 20.2 23.5z 17DK171 T09 C~89Ua 2017 02 21.60910 12 50 44.87 -00 41 18.4 23.9z 17DK171 T09 C~89Ua 2017 02 21.61177 12 50 44.86 -00 41 18.4 24.1z 17DK171 T09 C~89Ua 2017 02 23.54701 12 50 38.80 -00 40 31.9 24.1r 17DK171 T09 C~89Ua 2017 02 23.57183 12 50 38.70 -00 40 31.5 24.3r 17DK171 T09 C~89Ua 2017 02 23.61428 12 50 38.59 -00 40 30.2 24.3r 17DK171 T09 C~89Ua 2017 02 23.64401 12 50 38.48 -00 40 29.5 23.9r 17DK171 T09 C~89Ua 2017 02 23.64611 12 50 38.49 -00 40 29.3 24.0r 17DK171 T09 C~89Ua 2017 04 27.384634 12 46 25.43 -00 13 03.1 17DK171 T09 C~89Ua 2017 04 27.429017 12 46 25.25 -00 13 02.1 17DK171 T09 C~89Ua 2019 04 06.350099 12 57 13.73 -01 21 56.5 17DK171 T09 C~89Ua 2019 04 06.35349 12 57 13.71 -01 21 56.3 24.0i 17DK171 T09 C~8COu 2019 04 06.50438 12 57 13.03 -01 21 52.1 23.8i 17DK171 T09 C~8COu 2019 04 06.515104 12 57 13.01 -01 21 52.0 17DK171 T09 C~89Ua
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 0.14 0.00 -0.08
2 0.0000 0.00 -0.16 0.00 0.08
3 12.0410 0.00 -0.09 0.00 -0.10
4 12.0411 0.00 -0.17 0.00 -0.11
5 12.0411 0.00 0.01 0.00 -0.15
6 12.0413 0.00 -0.03 0.00 -0.10
7 12.9254 0.00 0.03 0.00 -0.05
8 12.9255 0.00 0.02 0.00 0.09
9 12.9255 0.00 0.13 0.00 0.07
10 12.9257 0.00 0.13 0.00 0.21
11 12.9257 0.00 0.11 0.00 0.15
12 12.9310 0.00 -0.02 0.00 0.07
13 12.9311 0.00 -0.31 0.00 -0.14
14 12.9312 0.00 0.12 0.00 0.13
15 12.9313 0.00 -0.07 0.00 0.10
16 12.9313 0.00 0.18 0.00 0.25
17 13.1031 0.00 0.01 0.00 -0.10
18 13.1032 0.00 -0.06 0.00 -0.06
19 15.0441 0.00 0.03 0.00 -0.15
20 15.0441 0.00 -0.05 0.00 -0.04
21 15.0445 0.00 -0.26 0.00 0.09
22 15.0446 0.00 0.15 0.00 -0.10
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.