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: 17DM121 # Created Tue Apr 1 01:11:03 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 18 observations of 18 # Arc: 8.00y # First observation: 2017/02/24 # Last observation: 2025/02/23 # Chi-squared of fit: 136.48 DOF: 30 RMS: 0.49 # Min/Max residuals: -0.69 1.37 # Exact a, adot, b, bdot, g, gdot: 1.200448E-05 2.486676E-02 -3.437360E-06 1.049682E-03 2.467360E-02 -4.139624E-04 # Covariance matrix: 3.4246E-13 -2.6968E-13 1.0750E-14 -1.0067E-14 1.6090E-13 -1.0989E-12 -2.6968E-13 3.4534E-13 -1.3773E-14 1.3887E-14 -1.7357E-13 1.5354E-12 1.0750E-14 -1.3773E-14 1.6544E-13 -2.6602E-14 2.2144E-14 -5.8295E-14 -1.0067E-14 1.3887E-14 -2.6602E-14 8.6537E-15 -7.7898E-15 6.3035E-14 1.6090E-13 -1.7357E-13 2.2144E-14 -7.7898E-15 7.5737E-13 -5.9463E-13 -1.0989E-12 1.5354E-12 -5.8295E-14 6.3035E-14 -5.9463E-13 7.0475E-12 # lat0 lon0 xBary yBary zBary JD0 10.167525 134.434402 -0.352630 0.163202 -0.909052 2457808.806091 # Heliocentric elements and errors Epoch: 2457808.5000 = 2017/02/24 Mean Anomaly: 352.04319 +/- 0.087 Argument of Peri: 86.03945 +/- 0.101 Long of Asc Node: 58.29573 +/- 0.001 Inclination: 10.21242 +/- 0.000 Eccentricity: 0.07118780 +/- 0.0001 Semi-Major Axis: 44.57728031 +/- 0.0080 Time of Perihelion: 2460211.2309 +/- 38.8 Perihelion: 41.40392194 +/- 0.0093 Aphelion: 47.75063869 +/- 0.0102 Period (y) 297.6313 +/- 0.08 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -28.83052959 +/- 0.0010 Ecliptic Y 28.89344995 +/- 0.0010 Ecliptic Z 7.15433165 +/- 0.0003 Ecliptic XDOT -0.00192106 +/- 0.0000 Ecliptic YDOT -0.00198538 +/- 0.0000 Ecliptic ZDOT 0.00010647 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 41.43930400 +/- 0.0010 Geocenter to KBO 40.52919868 +/- 0.0014 # Hcoef: 7.25
The following table shows the complete astrometric record for 17DM121. 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 (17DM121) followed by the observatory code and reference code for the source of the astrometry.
2017 02 24.30529 09 20 42.242 +26 12 06.35 23.6r 17DM121 568 C~2b80 2017 02 24.47162 09 20 41.414 +26 12 09.10 17DM121 568 C~2b80 2017 04 20.18165 09 17 45.063 +26 15 05.06 23.6R 17DM121 G37 C~2b80 2017 04 20.25532 09 17 45.011 +26 15 04.36 17DM121 G37 C~2b80 2018 02 06.29614 09 28 22.975 +25 42 04.44 17DM121 G37 C~2b80 2018 02 06.30340 09 28 22.923 +25 42 04.62 17DM121 G37 C~2b80 2018 02 06.31064 09 28 22.879 +25 42 04.66 17DM121 G37 C~2b80 2018 03 07.16974 09 25 57.612 +25 51 14.66 17DM121 G37 C~2b80 2018 03 07.17715 09 25 57.572 +25 51 15.04 17DM121 G37 C~2b80 2018 03 07.29548 09 25 57.038 +25 51 16.39 17DM121 G37 C~2b80 2020 02 18.168730 09 39 28.297 +24 56 14.10 23.1G 17DM121 G37 C~3k4S 2020 02 18.219130 09 39 28.013 +24 56 15.34 17DM121 G37 C~3k4S 2024 01 09.450330 10 06 07.884 +22 46 15.01 23.1G 17DM121 G37 C~7gv3 2024 01 09.490320 10 06 07.731 +22 46 15.83 17DM121 G37 C~7gv3 2024 01 09.528440 10 06 07.609 +22 46 17.09 17DM121 G37 C~7gv3 2025 02 23.260550 10 08 26.253 +22 38 01.30 22.7G 17DM121 G37 C~8ifW 2025 02 23.307490 10 08 26.012 +22 38 02.21 17DM121 G37 C~8ifW 2025 02 23.354650 10 08 25.718 +22 38 03.15 17DM121 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 1.15 0.00 0.55
2 0.0005 0.00 1.37 0.00 0.52
3 0.1502 0.00 -0.52 0.00 0.50
4 0.1504 0.00 -0.26 0.00 0.61
5 0.9500 0.00 -0.41 0.00 -0.14
6 0.9500 0.00 -0.61 0.00 -0.13
7 0.9500 0.00 -0.69 0.00 -0.27
8 1.0291 0.00 -0.32 0.00 -0.64
9 1.0291 0.00 -0.41 0.00 -0.35
10 1.0294 0.00 -0.19 0.00 -0.53
11 2.9811 0.00 0.58 0.00 -0.35
12 2.9813 0.00 0.27 0.00 -0.25
13 6.8724 0.00 -0.11 0.00 0.27
14 6.8725 0.00 -0.21 0.00 -0.08
15 6.8726 0.00 0.05 0.00 0.07
16 7.9971 0.00 0.38 0.00 0.31
17 7.9973 0.00 0.36 0.00 0.07
18 7.9974 0.00 -0.44 0.00 -0.14
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.
17DM121 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.553 44.553 44.553 ecceobj 0.069 0.069 0.069 incobj 10.191 10.191 10.191 qmin 40.604 40.596 40.622 qmax 48.626 48.606 48.625 amean 44.480 44.480 44.480 amin 44.132 44.132 44.133 amax 44.861 44.855 44.861 emean 0.070 0.070 0.070 emin 0.056 0.056 0.056 emax 0.084 0.084 0.084 imean 8.896 8.896 8.896 imin 8.412 8.411 8.412 imax 9.409 9.408 9.408 excite_mean 0.170 0.170 0.170 fracstop 1.000 1.000 1.000 cjmean 3.073 3.073 3.073 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 176.6 176.7 176.6 kozaiamp 179.9 179.9 179.9