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: 17DK160
# Created Mon Apr 28 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 23 observations of 23
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
0.000168 0.031741 0.000020 0.009560 0.027539 0.000000
# Chi-squared of fit: 9.57 DOF: 40 RMS: 0.11
# Min/Max residuals: -0.31 0.20
# Exact a, adot, b, bdot, g, gdot:
1.798835E-05 3.213346E-02 5.789976E-06 9.665523E-03 2.803165E-02 4.035998E-03
# Covariance matrix:
3.4842E-13 -4.2887E-13 4.5904E-14 -1.0349E-13 -1.5494E-13 -3.2333E-12
-4.2887E-13 9.4310E-13 -1.2040E-13 2.6454E-13 3.9018E-14 8.2594E-12
4.5904E-14 -1.2040E-13 1.8362E-13 -1.0974E-13 2.2180E-15 -1.1207E-12
-1.0349E-13 2.6454E-13 -1.0974E-13 1.3195E-13 4.3728E-15 2.4585E-12
-1.5494E-13 3.9018E-14 2.2180E-15 4.3728E-15 4.9271E-13 1.4449E-13
-3.2333E-12 8.2594E-12 -1.1207E-12 2.4585E-12 1.4449E-13 7.6754E-11
# lat0 lon0 xBary yBary zBary JD0
4.663941 -170.648274 -0.095093 0.080760 -0.988337 2457482.963558
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 11.18462 +/- 0.018
Argument of Peri: 349.48458 +/- 0.044
Long of Asc Node: 174.74227 +/- 0.000
Inclination: 17.30080 +/- 0.000
Eccentricity: 0.37331417 +/- 0.0002
Semi-Major Axis: 56.90584073 +/- 0.0174
Time of Perihelion: 2452609.1162 +/- 7.4
Perihelion: 35.66208391 +/- 0.0175
Aphelion: 78.14959755 +/- 0.0275
Period (y) 429.2828 +/- 0.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -36.04992352 +/- 0.0009
Ecliptic Y -6.03528791 +/- 0.0002
Ecliptic Z 2.90093302 +/- 0.0001
Ecliptic XDOT 0.00019818 +/- 0.0000
Ecliptic YDOT -0.00315511 +/- 0.0000
Ecliptic ZDOT 0.00097297 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 36.66656649 +/- 0.0009
Geocenter to KBO 35.67395756 +/- 0.0009
# Hcoef: 7.99
The following table shows the complete astrometric record for 17DK160. 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 (17DK160) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.462769 12 41 41.96 +00 34 59.6 17DK160 T09 C~81Bu 2016 04 04.557901 12 41 41.49 +00 35 03.1 17DK160 T09 C~81Bu 2016 04 06.484435 12 41 32.19 +00 36 12.4 17DK160 T09 C~81Bu 2016 04 06.605250 12 41 31.60 +00 36 16.7 17DK160 T09 C~81Bu 2017 02 21.50220 12 52 22.64 -00 03 25.8 24.1z 17DK160 T09 C~7xTz 2017 02 21.52572 12 52 22.56 -00 03 24.9 23.5z 17DK160 T09 C~7xTz 2017 02 21.61177 12 52 22.26 -00 03 22.1 23.5z 17DK160 T09 C~7xTz 2017 02 23.54701 12 52 15.73 -00 02 17.9 24.1r 17DK160 T09 C~7xU0 2017 02 23.58243 12 52 15.60 -00 02 16.8 24.1r 17DK160 T09 C~7xU0 2017 02 23.64611 12 52 15.39 -00 02 14.4 23.8r 17DK160 T09 C~7xU0 2017 02 23.65665 12 52 15.35 -00 02 14.1 24.0r 17DK160 T09 C~7xU0 2017 03 03.281289 12 51 47.126 +00 02 10.14 23.8r 17DK160 W84 C~8HKV 2017 03 25.267116 12 50 09.907 +00 15 43.42 23.4V 17DK160 W84 C~8HKV 2017 03 25.273819 12 50 09.862 +00 15 43.60 23.5V 17DK160 W84 C~8HKV 2017 04 27.399658 12 47 34.34 +00 34 36.4 17DK160 T09 C~81Bu 2017 04 27.411358 12 47 34.28 +00 34 36.8 17DK160 T09 C~81Bu 2019 02 07.340762 13 07 53.086 -00 35 30.30 22.6z 17DK160 W84 C~8HKV 2019 04 06.37036 13 04 16.89 -00 02 31.2 23.5i 17DK160 T09 C~81Bu 2019 04 06.37374 13 04 16.86 -00 02 30.9 23.5i 17DK160 T09 C~81Bu 2019 04 06.42173 13 04 16.64 -00 02 29.4 23.1i 17DK160 T09 C~81Bu 2019 04 06.45208 13 04 16.48 -00 02 28.5 22.8i 17DK160 T09 C~81Bu 2019 04 06.47931 13 04 16.36 -00 02 27.2 22.9i 17DK160 T09 C~81Bu 2019 04 06.53387 13 04 16.06 -00 02 25.3 23.3i 17DK160 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 0.03 0.00 -0.07
2 0.0003 -7.86 -0.02 0.45 -0.03
3 0.0055 -163.36 0.01 9.44 -0.05
4 0.0059 -173.18 0.02 9.92 -0.06
5 0.8844 9750.93 0.11 1654.39 0.00
6 0.8845 9749.47 0.05 1654.75 0.12
7 0.8847 9744.22 -0.04 1655.56 0.05
8 0.8900 9628.67 -0.02 1676.14 -0.02
9 0.8901 9626.44 -0.05 1676.38 -0.13
10 0.8903 9622.59 0.05 1677.35 0.20
11 0.8903 9621.92 0.04 1677.39 0.13
12 0.9112 9127.78 0.06 1754.13 0.10
13 0.9714 7464.53 -0.16 1929.18 0.04
14 0.9714 7463.84 -0.30 1929.08 -0.10
15 1.0621 4871.17 0.18 2054.33 -0.04
16 1.0621 4870.18 0.04 2054.35 -0.03
17 2.8443 23439.84 0.05 5388.34 -0.15
18 3.0032 19638.53 0.10 5932.83 0.03
19 3.0032 19637.99 -0.16 5932.93 0.12
20 3.0033 19634.34 0.14 5933.01 0.02
21 3.0034 19631.75 0.06 5932.89 -0.22
22 3.0035 19629.57 0.12 5933.38 0.17
23 3.0036 19624.63 -0.31 5933.35 -0.06
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.
17DK160 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 56.045 56.103 55.988 ecceobj 0.364 0.365 0.363 incobj 17.370 17.370 17.370 qmin 34.481 34.344 33.688 qmax 79.061 79.276 80.197 amean 56.202 56.182 56.290 amin 55.492 55.439 55.386 amax 57.130 57.103 57.341 emean 0.368 0.371 0.378 emin 0.352 0.353 0.353 emax 0.385 0.389 0.402 imean 16.384 16.259 15.873 imin 15.620 15.491 14.376 imax 17.148 17.077 17.061 excite_mean 0.464 0.465 0.467 fracstop 1.000 1.000 1.000 cjmean 2.972 2.971 2.969 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 164.8 162.7 159.8 kozaiamp 180.0 180.0 180.0