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: 17DU165
# Created Wed Jul 17 01:11:31 2024
# Orbit generated from Bernstein formalism
# Fitting 13 observations of 13
# Arc: 11.12d
# First observation: 2017/02/21
# Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
0.000000 0.027315 -0.000001 0.000668 0.025625 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit: 4.21 DOF: 21 RMS: 0.10
# Min/Max residuals: -0.17 0.17
# Exact a, adot, b, bdot, g, gdot:
1.526751E-05 2.360285E-02 -2.514475E-07 8.668982E-04 2.488298E-02 7.174445E-03
# Covariance matrix:
1.6572E-12 2.9101E-09 -1.5746E-13 -1.6005E-10 5.4701E-10 6.4871E-09
2.9101E-09 5.8084E-06 -3.1039E-10 -3.1901E-07 1.0856E-06 7.4985E-06
-1.5746E-13 -3.1039E-10 1.8923E-13 1.0107E-11 -5.8160E-11 -6.1693E-10
-1.6005E-10 -3.1901E-07 1.0107E-11 1.8330E-08 -5.9617E-08 -3.8609E-07
5.4701E-10 1.0856E-06 -5.8160E-11 -5.9617E-08 2.0309E-07 1.6436E-06
6.4871E-09 7.4985E-06 -6.1693E-10 -3.8609E-07 1.6436E-06 3.8883E-04
# lat0 lon0 xBary yBary zBary JD0
5.023382 -169.926002 0.602081 0.068770 -0.780619 2457806.031961
# Heliocentric elements and errors
Epoch: 2457800.5000 = 2017/02/16
Mean Anomaly: 68.77606 +/- 94.877
Argument of Peri: 325.32453 +/- 52.225
Long of Asc Node: 123.25824 +/- 5.171
Inclination: 5.39096 +/- 0.217
Eccentricity: 0.27637996 +/- 0.7690
Semi-Major Axis: 42.07962399 +/- 21.7653
Time of Perihelion: 2438752.8691 +/- 21726.5
Perihelion: 30.44965934 +/- 35.9874
Aphelion: 53.70958863 +/- 42.6475
Period (y) 272.9707 +/- 211.79
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -40.29654847 +/- 0.7139
Ecliptic Y -6.55186265 +/- 0.1268
Ecliptic Z 3.51895284 +/- 0.0637
Ecliptic XDOT -0.00030862 +/- 0.0021
Ecliptic YDOT -0.00269971 +/- 0.0005
Ecliptic ZDOT 0.00016407 +/- 0.0002
# Distances at JD0 (AU)
Heliocenter to KBO 40.97708814 +/- 0.7023
Geocenter to KBO 40.18811602 +/- 0.7278
# Hcoef: 8.22
The following table shows the complete astrometric record for 17DU165. 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 (17DU165) followed by the observatory code and reference code for the source of the astrometry.
2017 02 21.53116 12 44 54.69 +00 37 54.1 23.8z 17DU165 T09 C~83F3 2017 02 21.54460 12 44 54.65 +00 37 54.3 23.8z 17DU165 T09 C~83F3 2017 02 21.56614 12 44 54.56 +00 37 54.8 23.8z 17DU165 T09 C~83F3 2017 02 21.59841 12 44 54.45 +00 37 55.8 23.8z 17DU165 T09 C~83F3 2017 02 21.61716 12 44 54.40 +00 37 56.1 24.0z 17DU165 T09 C~83F3 2017 02 23.55846 12 44 47.75 +00 38 49.5 24.8r 17DU165 T09 C~83F3 2017 02 23.57824 12 44 47.68 +00 38 50.2 24.5r 17DU165 T09 C~83F3 2017 02 23.58033 12 44 47.67 +00 38 50.4 24.9r 17DU165 T09 C~83F3 2017 02 23.62494 12 44 47.52 +00 38 51.4 24.8r 17DU165 T09 C~83F3 2017 02 23.65456 12 44 47.40 +00 38 52.4 24.4r 17DU165 T09 C~83F3 2017 03 04.60945 12 44 13.94 +00 43 10.3 23.9y 17DU165 T09 C~83F3 2017 03 04.61213 12 44 13.95 +00 43 10.4 24.4y 17DU165 T09 C~83F3 2017 03 04.64731 12 44 13.80 +00 43 11.3 23.8y 17DU165 T09 C~83F3
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 -0.06 0.00 0.17
2 0.0000 -0.63 0.10 -0.05 0.05
3 0.0001 -2.07 -0.09 -0.12 -0.12
4 0.0002 -3.98 -0.12 0.15 -0.00
5 0.0002 -4.79 0.17 0.14 -0.11
6 0.0056 -117.48 0.06 10.20 -0.13
7 0.0056 -118.72 0.01 10.44 0.01
8 0.0056 -118.93 -0.08 10.56 0.13
9 0.0057 -121.39 0.14 10.60 -0.04
10 0.0058 -123.44 -0.13 10.82 0.04
11 0.0303 -686.22 -0.17 51.56 -0.03
12 0.0303 -686.12 0.11 51.71 0.11
13 0.0304 -688.55 0.05 51.66 -0.07
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.
17DU165 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0