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: 17DP166
# Created Wed Nov 27 02:10:49 2024
# Orbit generated from Bernstein formalism
# Fitting 12 observations of 12
# Arc: 11.14d
# First observation: 2017/02/21
# Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
0.000001 0.036554 -0.000000 -0.001242 0.030200 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit: 3.24 DOF: 19 RMS: 0.09
# Min/Max residuals: -0.27 0.18
# Exact a, adot, b, bdot, g, gdot:
1.754390E-05 3.146434E-02 -5.948254E-07 -9.101556E-04 2.916502E-02 3.559011E-03
# Covariance matrix:
2.5330E-12 4.7964E-09 -2.6494E-13 -3.1490E-10 9.3793E-10 4.3399E-08
4.7964E-09 1.0117E-05 -5.4971E-10 -6.6376E-07 1.9635E-06 7.5151E-05
-2.6494E-13 -5.4971E-10 2.3561E-13 2.8543E-11 -1.0716E-10 -4.7336E-09
-3.1490E-10 -6.6376E-07 2.8543E-11 4.4228E-08 -1.2879E-07 -4.8818E-06
9.3793E-10 1.9635E-06 -1.0716E-10 -1.2879E-07 3.8175E-07 1.5509E-05
4.3399E-08 7.5151E-05 -4.7336E-09 -4.8818E-06 1.5509E-05 1.8412E-03
# lat0 lon0 xBary yBary zBary JD0
5.730259 -168.704585 0.618906 0.077077 -0.766557 2457806.013161
# Heliocentric elements and errors
Epoch: 2457800.5000 = 2017/02/16
Mean Anomaly: 55.29589 +/- 134.183
Argument of Peri: 39.02400 +/- 250.536
Long of Asc Node: 84.93756 +/- 1.990
Inclination: 5.80882 +/- 0.054
Eccentricity: 0.10777959 +/- 1.3509
Semi-Major Axis: 37.01576456 +/- 15.5076
Time of Perihelion: 2445165.6852 +/- 29614.1
Perihelion: 33.02622065 +/- 51.8840
Aphelion: 41.00530847 +/- 52.8737
Period (y) 225.2103 +/- 141.53
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -34.33533999 +/- 0.7088
Ecliptic Y -6.23113783 +/- 0.1415
Ecliptic Z 3.42343658 +/- 0.0725
Ecliptic XDOT 0.00024731 +/- 0.0039
Ecliptic YDOT -0.00296993 +/- 0.0009
Ecliptic ZDOT -0.00005172 +/- 0.0004
# Distances at JD0 (AU)
Heliocenter to KBO 35.06369303 +/- 0.6945
Geocenter to KBO 34.28765289 +/- 0.7264
# Hcoef: 8.41
The following table shows the complete astrometric record for 17DP166. 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 (17DP166) followed by the observatory code and reference code for the source of the astrometry.
2017 02 21.51236 12 50 29.66 +00 48 25.1 23.1z 17DP166 T09 C~85Iz 2017 02 21.53383 12 50 29.58 +00 48 25.6 23.1z 17DP166 T09 C~85Iz 2017 02 21.54727 12 50 29.53 +00 48 26.1 23.3z 17DP166 T09 C~85Iz 2017 02 21.59841 12 50 29.34 +00 48 27.6 23.4z 17DP166 T09 C~85Iz 2017 02 21.61983 12 50 29.26 +00 48 28.3 23.2z 17DP166 T09 C~85Iz 2017 02 23.58243 12 50 21.79 +00 49 28.4 24.6r 17DP166 T09 C~85Iz 2017 02 23.59306 12 50 21.73 +00 49 29.0 25.2r 17DP166 T09 C~85Iz 2017 02 23.65665 12 50 21.50 +00 49 30.6 24.4r 17DP166 T09 C~85Iz 2017 03 04.55785 12 49 44.23 +00 54 16.9 23.6y 17DP166 T09 C~85Iz 2017 03 04.57141 12 49 44.17 +00 54 17.4 23.6y 17DP166 T09 C~85Iz 2017 03 04.61213 12 49 43.99 +00 54 18.7 23.5y 17DP166 T09 C~85Iz 2017 03 04.65010 12 49 43.82 +00 54 20.1 23.4y 17DP166 T09 C~85Iz
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 -0.10 0.00 0.02
2 0.0001 -1.30 -0.01 -0.01 -0.10
3 0.0001 -2.19 -0.03 0.16 -0.01
4 0.0002 -5.39 0.07 0.43 -0.02
5 0.0003 -6.77 0.08 0.61 0.04
6 0.0057 -133.38 0.08 12.24 0.01
7 0.0057 -134.44 -0.27 12.44 0.15
8 0.0059 -138.24 0.18 12.57 -0.06
9 0.0302 -764.63 -0.05 58.13 -0.08
10 0.0303 -765.65 -0.04 58.24 -0.02
11 0.0304 -768.65 0.05 58.39 -0.03
12 0.0305 -771.54 0.03 58.68 0.11
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.