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: 17DH171
# Created Sun Nov 24 02:10:50 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 23 observations of 23
# Arc: 15.37y
# First observation: 2003/12/26
# Last observation: 2019/05/09
# Chi-squared of fit: 9.11 DOF: 40 RMS: 0.11
# Min/Max residuals: -0.27 0.22
# Exact a, adot, b, bdot, g, gdot:
1.737818E-05 2.548134E-02 2.049282E-06 2.430203E-03 2.470780E-02 -1.535257E-04
# Covariance matrix:
2.9266E-13 -4.9416E-14 2.8612E-15 -2.8891E-15 -1.6074E-14 -7.8191E-14
-4.9416E-14 3.3591E-14 -3.1258E-15 3.1637E-15 1.6841E-14 8.5544E-14
2.8612E-15 -3.1258E-15 2.6650E-13 -2.0824E-14 -1.4667E-15 -8.5054E-15
-2.8891E-15 3.1637E-15 -2.0824E-14 2.3740E-15 -2.2438E-15 9.3018E-15
-1.6074E-14 1.6841E-14 -1.4667E-15 -2.2438E-15 3.6965E-13 -2.1452E-14
-7.8191E-14 8.5544E-14 -8.5054E-15 9.3018E-15 -2.1452E-14 2.4422E-13
# lat0 lon0 xBary yBary zBary JD0
3.374339 169.328037 0.947961 0.014788 -0.249731 2453000.055581
# Heliocentric elements and errors
Epoch: 2453000.5000 = 2003/12/27
Mean Anomaly: 347.69756 +/- 0.013
Argument of Peri: 46.97947 +/- 0.016
Long of Asc Node: 136.78527 +/- 0.001
Inclination: 6.45074 +/- 0.000
Eccentricity: 0.11644063 +/- 0.0001
Semi-Major Axis: 45.92893682 +/- 0.0053
Time of Perihelion: 2456885.7311 +/- 19.4
Perihelion: 40.58094248 +/- 0.0059
Aphelion: 51.27693116 +/- 0.0069
Period (y) 311.2704 +/- 0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.77786858 +/- 0.0010
Ecliptic Y 8.46211307 +/- 0.0002
Ecliptic Z 2.38229388 +/- 0.0001
Ecliptic XDOT -0.00049485 +/- 0.0000
Ecliptic YDOT -0.00278714 +/- 0.0000
Ecliptic ZDOT 0.00026797 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 40.73773473 +/- 0.0010
Geocenter to KBO 40.47307119 +/- 0.0010
# Hcoef: 7.02
The following table shows the complete astrometric record for 17DH171. 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 (17DH171) followed by the observatory code and reference code for the source of the astrometry.
2003 12 26.554838 11 26 05.68 +07 19 38.3 17DH171 T14 C~89Ua 2003 12 26.590217 11 26 05.68 +07 19 38.6 17DH171 T14 C~89Ua 2003 12 27.486104 11 26 05.31 +07 19 47.3 17DH171 T14 C~89Ua 2003 12 27.526826 11 26 05.30 +07 19 47.8 17DH171 T14 C~89Ua 2003 12 27.567228 11 26 05.27 +07 19 48.1 17DH171 T14 C~89Ua 2013 02 03.313950 12 15 55.26 +03 18 06.4 22.9z 17DH171 W84 C~89Ua 2013 02 03.329577 12 15 55.21 +03 18 07.0 22.8z 17DH171 W84 C~89Ua 2013 04 03.246863 12 11 58.96 +03 47 21.0 22.7z 17DH171 W84 C~89Ua 2014 02 23.338469 12 20 32.08 +02 57 50.9 22.2i 17DH171 W84 C~89Ua 2014 02 24.296318 12 20 28.46 +02 58 19.5 23.3i 17DH171 W84 C~89Ua 2017 02 02.624862 12 38 33.66 +01 20 38.6 17DH171 T09 C~89Ua 2017 02 21.50560 12 37 41.29 +01 28 32.7 23.1z 17DH171 T09 C~89Ua 2017 02 21.55007 12 37 41.13 +01 28 33.9 23.3z 17DH171 T09 C~89Ua 2017 02 21.57161 12 37 41.04 +01 28 34.6 23.5z 17DH171 T09 C~89Ua 2017 02 23.58678 12 37 34.05 +01 29 32.2 22.7r 17DH171 T09 C~89Ua 2017 02 23.58888 12 37 34.01 +01 29 32.0 23.2r 17DH171 T09 C~89Ua 2017 02 23.62075 12 37 33.92 +01 29 32.8 22.6r 17DH171 T09 C~89Ua 2017 04 02.385436 12 34 53.37 +01 48 51.6 17DH171 T09 C~89Ua 2017 04 02.456068 12 34 53.04 +01 48 53.7 17DH171 T09 C~89Ua 2018 05 17.063363 12 37 39.168 +01 36 10.37 23.7g 17DH171 W84 C~8HKW 2019 04 03.426512 12 46 14.92 +00 49 40.9 17DH171 T09 C~89Ua 2019 04 03.461545 12 46 14.75 +00 49 42.0 17DH171 T09 C~89Ua 2019 05 09.446752 12 43 43.83 +01 04 36.8 17DH171 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 -0.25 0.00 -0.01
2 0.0001 0.00 -0.00 0.00 -0.04
3 0.0025 0.00 -0.00 0.00 -0.00
4 0.0027 0.00 0.17 0.00 0.09
5 0.0028 0.00 0.04 0.00 -0.02
6 9.1082 0.00 0.00 0.00 -0.18
7 9.1082 0.00 -0.12 0.00 0.05
8 9.2695 0.00 0.15 0.00 0.21
9 10.1623 0.00 -0.08 0.00 -0.03
10 10.1649 0.00 0.03 0.00 -0.02
11 13.1063 0.00 0.07 0.00 -0.06
12 13.1580 0.00 0.02 0.00 0.03
13 13.1581 0.00 -0.04 0.00 -0.03
14 13.1582 0.00 -0.26 0.00 0.06
15 13.1637 0.00 0.22 0.00 0.22
16 13.1637 0.00 -0.27 0.00 -0.04
17 13.1638 0.00 0.11 0.00 -0.16
18 13.2672 0.00 0.07 0.00 -0.03
19 13.2674 0.00 0.04 0.00 -0.04
20 14.3888 0.00 -0.03 0.00 0.02
21 15.2686 0.00 0.12 0.00 -0.01
22 15.2687 0.00 0.01 0.00 0.04
23 15.3673 0.00 -0.14 0.00 0.01
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.