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: 17DL171
# Created Sun Nov 24 02:10:50 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 23 observations of 23
# Arc: 15.04y
# First observation: 2004/03/20
# Last observation: 2019/04/06
# Chi-squared of fit: 11.27 DOF: 40 RMS: 0.12
# Min/Max residuals: -0.30 0.34
# Exact a, adot, b, bdot, g, gdot:
1.453442E-05 2.165530E-02 9.171923E-07 1.197353E-03 2.419017E-02 5.693276E-03
# Covariance matrix:
7.3409E-13 -1.1070E-13 1.9810E-15 -3.1770E-15 -5.4900E-14 -2.0033E-13
-1.1070E-13 9.9156E-14 -3.2826E-15 5.2496E-15 7.3735E-14 3.3156E-13
1.9810E-15 -3.2826E-15 6.9945E-13 -5.3725E-14 -2.4612E-15 -1.1503E-14
-3.1770E-15 5.2496E-15 -5.3725E-14 4.8305E-15 4.3482E-15 1.8396E-14
-5.4900E-14 7.3735E-14 -2.4612E-15 4.3482E-15 5.3546E-13 2.5959E-13
-2.0033E-13 3.3156E-13 -1.1503E-14 1.8396E-14 2.5959E-13 1.1619E-12
# lat0 lon0 xBary yBary zBary JD0
4.186972 175.322371 -0.085882 0.072235 -0.986014 2453084.988189
# Heliocentric elements and errors
Epoch: 2453084.5000 = 2004/03/20
Mean Anomaly: 91.35249 +/- 0.029
Argument of Peri: 291.96609 +/- 0.016
Long of Asc Node: 123.30252 +/- 0.002
Inclination: 5.17417 +/- 0.000
Eccentricity: 0.26570262 +/- 0.0000
Semi-Major Axis: 39.44241773 +/- 0.0040
Time of Perihelion: 2430125.0430 +/- 8.2
Perihelion: 28.96246418 +/- 0.0033
Aphelion: 49.92237128 +/- 0.0053
Period (y) 247.7157 +/- 0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.08760454 +/- 0.0012
Ecliptic Y 3.35892699 +/- 0.0001
Ecliptic Z 3.01828588 +/- 0.0001
Ecliptic XDOT -0.00083395 +/- 0.0000
Ecliptic YDOT -0.00239799 +/- 0.0000
Ecliptic ZDOT 0.00018234 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.32901795 +/- 0.0012
Geocenter to KBO 41.33899879 +/- 0.0013
# Hcoef: 8.00
The following table shows the complete astrometric record for 17DL171. 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 (17DL171) followed by the observatory code and reference code for the source of the astrometry.
2004 03 20.487446 11 49 29.92 +05 42 03.9 17DL171 T14 C~89Ua 2004 03 20.520303 11 49 29.78 +05 42 04.9 17DL171 T14 C~89Ua 2016 04 04.459918 12 40 55.69 +00 51 03.0 17DL171 T09 C~89Ua 2016 04 04.46278 12 40 55.66 +00 51 03.2 25.1g 17DL171 T09 C~8COu 2016 04 04.48277 12 40 55.60 +00 51 03.7 25.0g 17DL171 T09 C~8COu 2016 04 04.49356 12 40 55.54 +00 51 04.0 25.4g 17DL171 T09 C~8COu 2016 04 04.52802 12 40 55.39 +00 51 05.0 25.3g 17DL171 T09 C~8COu 2016 04 04.557901 12 40 55.27 +00 51 05.7 17DL171 T09 C~89Ua 2017 02 21.49884 12 47 46.36 +00 08 05.3 24.1z 17DL171 T09 C~89Ua 2017 02 21.52305 12 47 46.30 +00 08 06.3 24.2z 17DL171 T09 C~89Ua 2017 02 21.54460 12 47 46.21 +00 08 06.4 23.9z 17DL171 T09 C~89Ua 2017 02 21.59841 12 47 46.05 +00 08 08.0 24.4z 17DL171 T09 C~89Ua 2017 02 21.61716 12 47 45.98 +00 08 08.1 24.4z 17DL171 T09 C~89Ua 2017 02 23.54421 12 47 39.91 +00 08 56.5 24.5r 17DL171 T09 C~89Ua 2017 02 23.58033 12 47 39.80 +00 08 57.3 24.5r 17DL171 T09 C~89Ua 2017 02 23.61428 12 47 39.69 +00 08 58.2 24.1r 17DL171 T09 C~89Ua 2017 02 23.65456 12 47 39.56 +00 08 59.4 24.3r 17DL171 T09 C~89Ua 2017 02 23.65665 12 47 39.56 +00 08 59.7 24.7r 17DL171 T09 C~89Ua 2017 04 27.395922 12 43 29.38 +00 36 39.9 17DL171 T09 C~89Ua 2017 04 27.408451 12 43 29.34 +00 36 40.1 17DL171 T09 C~89Ua 2019 04 04.520389 12 53 10.84 -00 19 39.0 17DL171 T09 C~89Ua 2019 04 06.449359 12 53 02.66 -00 18 47.1 17DL171 T09 C~89Ua 2019 04 06.515104 12 53 02.39 -00 18 45.3 17DL171 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 -0.08 0.00 0.01
2 0.0001 0.00 0.08 0.00 0.03
3 12.0410 0.00 -0.04 0.00 -0.11
4 12.0410 0.00 -0.30 0.00 0.02
5 12.0411 0.00 0.10 0.00 -0.03
6 12.0411 0.00 -0.09 0.00 -0.02
7 12.0412 0.00 -0.10 0.00 0.05
8 12.0413 0.00 0.04 0.00 -0.07
9 12.9254 0.00 -0.03 0.00 -0.13
10 12.9255 0.00 0.22 0.00 0.27
11 12.9256 0.00 -0.10 0.00 -0.16
12 12.9257 0.00 0.06 0.00 0.11
13 12.9257 0.00 -0.10 0.00 -0.26
14 12.9310 0.00 -0.15 0.00 -0.02
15 12.9311 0.00 -0.02 0.00 -0.14
16 12.9312 0.00 0.00 0.00 -0.09
17 12.9313 0.00 0.03 0.00 0.09
18 12.9313 0.00 0.13 0.00 0.34
19 13.1031 0.00 0.06 0.00 0.05
20 13.1031 0.00 0.19 0.00 -0.02
21 15.0391 0.00 -0.05 0.00 0.10
22 15.0444 0.00 -0.11 0.00 0.00
23 15.0446 0.00 0.09 0.00 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.