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: 17DN121
# Created Wed Mar 26 01:11:06 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 20 observations of 20
# Arc: 9.13y
# First observation: 2016/01/08
# Last observation: 2025/02/23
# Chi-squared of fit: 46.30 DOF: 34 RMS: 0.27
# Min/Max residuals: -0.78 0.72
# Exact a, adot, b, bdot, g, gdot:
1.627455E-05 3.078940E-02 -3.107543E-06 -6.609162E-03 2.760187E-02 1.636030E-03
# Covariance matrix:
5.1442E-13 -1.3730E-13 -3.7961E-14 2.7444E-14 2.7610E-13 -4.2851E-13
-1.3730E-13 1.5748E-13 4.4313E-14 -3.2935E-14 1.8142E-13 5.1008E-13
-3.7961E-14 4.4313E-14 2.0643E-13 -4.1001E-14 4.3318E-14 1.5324E-13
2.7444E-14 -3.2935E-14 -4.1001E-14 1.5656E-14 -3.3464E-14 -1.1369E-13
2.7610E-13 1.8142E-13 4.3318E-14 -3.3464E-14 8.8903E-13 5.1256E-13
-4.2851E-13 5.1008E-13 1.5324E-13 -1.1369E-13 5.1256E-13 1.7617E-12
# lat0 lon0 xBary yBary zBary JD0
9.668858 136.231296 0.480094 0.144415 -0.846321 2457395.842982
# Heliocentric elements and errors
Epoch: 2457396.5000 = 2016/01/09
Mean Anomaly: 7.15758 +/- 0.008
Argument of Peri: 129.40366 +/- 0.014
Long of Asc Node: 353.29634 +/- 0.000
Inclination: 15.18132 +/- 0.000
Eccentricity: 0.23295717 +/- 0.0001
Semi-Major Axis: 48.14963187 +/- 0.0086
Time of Perihelion: 2454970.1596 +/- 2.9
Perihelion: 36.93283005 +/- 0.0084
Aphelion: 59.36643369 +/- 0.0118
Period (y) 334.1163 +/- 0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -26.08306550 +/- 0.0009
Ecliptic Y 25.64439451 +/- 0.0009
Ecliptic Z 6.08469183 +/- 0.0002
Ecliptic XDOT -0.00230843 +/- 0.0000
Ecliptic YDOT -0.00202552 +/- 0.0000
Ecliptic ZDOT -0.00061897 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 37.08076150 +/- 0.0009
Geocenter to KBO 36.22941263 +/- 0.0012
# Hcoef: 7.31
The following table shows the complete astrometric record for 17DN121. 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 (17DN121) followed by the observatory code and reference code for the source of the astrometry.
2016 01 08.342193 09 27 28.13 +25 10 21.6 17DN121 W84 C~3k4S 2016 01 08.343964 09 27 28.12 +25 10 21.6 17DN121 W84 C~3k4S 2017 02 24.30916 09 29 55.080 +24 33 16.57 23.0r 17DN121 568 C~2b80 2017 02 24.47569 09 29 54.123 +24 33 19.09 23.0r 17DN121 568 C~2b80 2017 04 20.17337 09 26 31.424 +24 34 58.60 17DN121 G37 C~2b80 2017 04 20.23129 09 26 31.335 +24 34 57.32 17DN121 G37 C~2b81 2018 02 06.23890 09 38 24.661 +23 30 50.06 17DN121 G37 C~2b81 2018 02 06.24656 09 38 24.586 +23 30 50.24 17DN121 G37 C~2b81 2018 02 06.28755 09 38 24.337 +23 30 51.39 17DN121 G37 C~2b81 2018 03 07.16145 09 35 43.935 +23 39 58.87 17DN121 G37 C~2b81 2018 03 07.28767 09 35 43.304 +23 40 00.53 17DN121 G37 C~2b81 2019 02 08.335600 09 44 51.379 +22 34 24.21 22.9G 17DN121 G37 C~2zme 2019 02 08.474220 09 44 50.600 +22 34 27.52 17DN121 G37 C~2zme 2020 02 18.173230 09 50 27.696 +21 40 17.18 22.6G 17DN121 G37 C~3k4S 2020 02 18.223600 09 50 27.423 +21 40 18.21 17DN121 G37 C~3k4S 2023 03 18.173100 10 06 51.438 +18 52 42.81 22.8G 17DN121 G37 C~6VHX 2023 03 18.215610 10 06 51.246 +18 52 43.50 17DN121 G37 C~6VHX 2025 02 23.272420 10 20 52.482 +16 44 47.38 22.7G 17DN121 G37 C~8ifW 2025 02 23.319610 10 20 52.222 +16 44 48.56 17DN121 G37 C~8ifW 2025 02 23.366510 10 20 51.979 +16 44 49.74 17DN121 G37 C~8ifW
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 -0.22
2 0.0000 0.00 0.22 0.00 -0.27
3 1.1306 0.00 -0.51 0.00 0.31
4 1.1311 0.00 -0.78 0.00 0.11
5 1.2809 0.00 0.47 0.00 0.72
6 1.2810 0.00 0.24 0.00 0.25
7 2.0805 0.00 0.43 0.00 -0.15
8 2.0805 0.00 -0.03 0.00 -0.16
9 2.0806 0.00 -0.21 0.00 0.00
10 2.1597 0.00 -0.15 0.00 -0.28
11 2.1600 0.00 0.21 0.00 -0.25
12 3.0855 0.00 -0.33 0.00 0.03
13 3.0859 0.00 -0.10 0.00 0.00
14 4.1118 0.00 -0.03 0.00 -0.03
15 4.1119 0.00 0.17 0.00 -0.15
16 7.1891 0.00 0.06 0.00 -0.00
17 7.1892 0.00 0.25 0.00 0.04
18 9.1278 0.00 -0.07 0.00 0.01
19 9.1279 0.00 -0.12 0.00 0.01
20 9.1281 0.00 0.06 0.00 0.03
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.
17DN121 quality flag:3 Type: 2:1E 2:1E 2:1E axisobj 48.032 48.032 48.032 ecceobj 0.231 0.231 0.231 incobj 15.217 15.217 15.217 qmin 35.827 35.764 35.777 qmax 60.426 60.812 60.447 amean 47.795 47.795 47.795 amin 47.208 47.183 47.216 amax 48.496 48.520 48.476 emean 0.219 0.233 0.215 emin 0.196 0.211 0.186 emax 0.250 0.254 0.249 imean 16.016 15.782 15.650 imin 15.485 14.919 14.469 imax 16.555 16.592 16.538 excite_mean 0.353 0.358 0.345 fracstop 1.000 1.000 1.000 cjmean 2.993 2.988 2.999 libcent 0 180.0 180.0 179.6 libamp 0 151.4 152.7 151.3 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 195.4 204.8 176.3 kozaiamp 180.0 179.8 179.9