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: 17DL160
# Created Mon Apr 28 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 18
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000071 0.024273 0.000003 -0.001082 0.024235 0.000000
# Chi-squared of fit: 7.21 DOF: 28 RMS: 0.12
# Min/Max residuals: -0.36 0.23
# Exact a, adot, b, bdot, g, gdot:
1.491398E-05 2.410403E-02 -2.989483E-07 -1.076487E-03 2.446678E-02 -1.770906E-03
# Covariance matrix:
2.4334E-13 -3.2299E-13 -3.5490E-15 1.0943E-14 -9.8491E-14 -3.3257E-12
-3.2299E-13 1.1670E-12 1.1780E-14 -4.8957E-14 -1.2943E-13 1.4955E-11
-3.5490E-15 1.1780E-14 1.6271E-13 -7.8766E-14 3.0518E-15 1.6063E-13
1.0943E-14 -4.8957E-14 -7.8766E-14 8.2538E-14 6.2471E-15 -6.7390E-13
-9.8491E-14 -1.2943E-13 3.0518E-15 6.2471E-15 6.5029E-13 -1.9934E-12
-3.3257E-12 1.4955E-11 1.6063E-13 -6.7390E-13 -1.9934E-12 2.0588E-10
# lat0 lon0 xBary yBary zBary JD0
5.010402 -170.330551 -0.089592 0.086780 -0.988341 2457482.963558
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 304.93213 +/- 0.194
Argument of Peri: 180.87229 +/- 0.265
Long of Asc Node: 72.01976 +/- 0.006
Inclination: 5.52460 +/- 0.000
Eccentricity: 0.08193432 +/- 0.0005
Semi-Major Axis: 43.70394730 +/- 0.0061
Time of Perihelion: 2473623.1641 +/- 56.7
Perihelion: 40.12309429 +/- 0.0226
Aphelion: 47.28480030 +/- 0.0229
Period (y) 288.9277 +/- 0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.10379995 +/- 0.0013
Ecliptic Y -7.09636527 +/- 0.0002
Ecliptic Z 3.56962007 +/- 0.0001
Ecliptic XDOT 0.00063740 +/- 0.0000
Ecliptic YDOT -0.00263453 +/- 0.0000
Ecliptic ZDOT -0.00013730 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.86433993 +/- 0.0013
Geocenter to KBO 40.87174759 +/- 0.0013
# Hcoef: 8.90
The following table shows the complete astrometric record for 17DL160. 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 (17DL160) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.462769 12 43 24.48 +00 46 39.7 17DL160 T09 C~81Bu 2016 04 04.482759 12 43 24.39 +00 46 40.5 17DL160 T09 C~81Bu 2016 04 04.528005 12 43 24.17 +00 46 41.5 17DL160 T09 C~81Bu 2016 04 05.462299 12 43 19.97 +00 47 07.2 17DL160 T09 C~81Bu 2016 04 05.521210 12 43 19.70 +00 47 08.9 17DL160 T09 C~81Bu 2016 04 05.580226 12 43 19.43 +00 47 10.4 17DL160 T09 C~81Bu 2017 02 21.50220 12 51 17.36 -00 08 55.2 24.6z 17DL160 T09 C~7xU0 2017 02 21.56882 12 51 17.14 -00 08 53.5 24.4z 17DL160 T09 C~7xU0 2017 02 21.61983 12 51 16.95 -00 08 52.2 24.6z 17DL160 T09 C~7xU0 2017 02 23.54701 12 51 10.71 -00 08 04.1 25.6r 17DL160 T09 C~7xU0 2017 02 23.58243 12 51 10.58 -00 08 03.3 25.0r 17DL160 T09 C~7xU0 2017 02 23.61428 12 51 10.49 -00 08 02.1 25.3r 17DL160 T09 C~7xU0 2017 02 23.64611 12 51 10.34 -00 08 01.6 25.6r 17DL160 T09 C~7xU0 2017 04 27.384634 12 46 46.48 +00 20 02.6 17DL160 T09 C~81Bu 2017 04 27.411358 12 46 46.37 +00 20 03.2 17DL160 T09 C~81Bu 2019 04 06.353478 12 58 23.44 -01 01 17.1 17DL160 T09 C~81Bu 2019 04 06.463135 12 58 22.94 -01 01 14.2 17DL160 T09 C~81Bu 2019 04 06.517777 12 58 22.68 -01 01 12.7 17DL160 T09 C~81Bu
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 0.0001 -1.56 0.06 0.21 0.16
3 0.0002 -4.98 -0.02 -0.17 -0.14
4 0.0027 -73.01 -0.04 -1.23 -0.07
5 0.0029 -77.40 -0.09 -1.25 0.01
6 0.0031 -81.72 -0.06 -1.46 -0.10
7 0.8844 7836.47 0.23 -285.18 0.13
8 0.8846 7832.76 0.18 -284.92 0.17
9 0.8848 7829.63 -0.16 -284.84 0.07
10 0.8900 7724.51 0.11 -277.31 0.12
11 0.8901 7722.40 0.01 -277.34 -0.03
12 0.8902 7720.69 ( 0.10) -276.76 ( 0.44)
13 0.8903 7718.42 -0.36 -277.19 -0.09
14 1.0621 3413.81 0.01 -280.72 -0.03
15 1.0621 3412.05 0.00 -280.82 -0.01
16 3.0031 14969.99 -0.06 -669.80 0.04
17 3.0034 14961.91 0.08 -670.07 -0.04
18 3.0036 14957.71 -0.02 -670.22 -0.09
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.
17DL160 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.220 43.238 43.201 ecceobj 0.077 0.076 0.077 incobj 5.529 5.529 5.529 qmin 39.511 39.540 39.456 qmax 47.586 47.620 47.638 amean 43.446 43.471 43.442 amin 43.099 43.130 43.099 amax 43.817 43.840 43.810 emean 0.067 0.066 0.067 emin 0.049 0.047 0.047 emax 0.087 0.087 0.088 imean 3.530 3.525 3.493 imin 2.645 2.643 2.587 imax 4.356 4.347 4.347 excite_mean 0.092 0.091 0.091 fracstop 1.000 1.000 1.000 cjmean 3.085 3.085 3.085 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 183.9 183.7 183.4 kozaiamp 180.0 180.0 179.9