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: 17MP42 # Created Wed Sep 3 01:11:40 2025 # Orbit generated from Bernstein formalism # Fitting 20 observations of 20 # Arc: 1.06y # First observation: 2016/07/29 # Last observation: 2017/08/22 Preliminary a, adot, b, bdot, g, gdot: -0.000067 0.018745 0.000005 0.001389 0.022062 0.000000 # Chi-squared of fit: 5.76 DOF: 34 RMS: 0.09 # Min/Max residuals: -0.15 0.19 # Exact a, adot, b, bdot, g, gdot: 1.296118E-05 1.880016E-02 1.385635E-06 1.398923E-03 2.223741E-02 2.007538E-03 # Covariance matrix: 3.6168E-13 6.5253E-13 -2.0301E-14 8.4341E-14 9.2613E-13 5.5584E-11 6.5253E-13 9.6301E-12 -1.1218E-13 5.0082E-13 4.8783E-12 5.0737E-10 -2.0301E-14 -1.1218E-13 1.5073E-13 -1.7414E-13 -9.5646E-14 -6.9408E-12 8.4341E-14 5.0082E-13 -1.7414E-13 4.0266E-13 4.0489E-13 3.0504E-11 9.2613E-13 4.8783E-12 -9.5646E-14 4.0489E-13 4.3117E-12 3.0515E-10 5.5584E-11 5.0737E-10 -6.9408E-12 3.0504E-11 3.0515E-10 2.8612E-08 # lat0 lon0 xBary yBary zBary JD0 15.120336 -24.994334 0.481591 0.233225 -0.862756 2457598.857009 # Heliocentric elements and errors Epoch: 2457590.5000 = 2016/07/21 Mean Anomaly: 143.60177 +/- 2.143 Argument of Peri: 279.51274 +/- 2.092 Long of Asc Node: 261.20787 +/- 0.010 Inclination: 15.46131 +/- 0.001 Eccentricity: 0.18646632 +/- 0.0030 Semi-Major Axis: 39.51029248 +/- 0.0547 Time of Perihelion: 2421406.1248 +/- 534.8 Perihelion: 32.14295368 +/- 0.1284 Aphelion: 46.87763127 +/- 0.1368 Period (y) 248.3554 +/- 0.52 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 39.94992704 +/- 0.0037 Ecliptic Y -19.15944985 +/- 0.0017 Ecliptic Z 11.73022649 +/- 0.0011 Ecliptic XDOT 0.00115480 +/- 0.0000 Ecliptic YDOT 0.00200905 +/- 0.0000 Ecliptic ZDOT 0.00023072 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 45.83316924 +/- 0.0033 Geocenter to KBO 44.96927256 +/- 0.0042 # Hcoef: 6.90
The following table shows the complete astrometric record for 17MP42. 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 (17MP42) followed by the observatory code and reference code for the source of the astrometry.
2016 07 29.35622 22 05 24.49 +04 25 12.4 23.4z 17MP42 T09 C~91XO 2016 07 29.37997 22 05 24.40 +04 25 12.3 23.6z 17MP42 T09 C~91XO 2016 07 29.38267 22 05 24.37 +04 25 12.1 23.5z 17MP42 T09 C~91XO 2016 07 29.39345 22 05 24.33 +04 25 11.9 23.8z 17MP42 T09 C~91XO 2016 08 28.28007 22 03 20.29 +04 16 09.1 23.3i 17MP42 T09 C~91XO 2016 08 28.28962 22 03 20.24 +04 16 08.7 23.3i 17MP42 T09 C~91XO 2016 08 28.29774 22 03 20.20 +04 16 08.6 23.2i 17MP42 T09 C~91XO 2016 08 28.30585 22 03 20.18 +04 16 08.4 23.2i 17MP42 T09 C~91XO 2016 08 28.30855 22 03 20.17 +04 16 08.4 23.2i 17MP42 T09 C~91XO 2016 08 28.31395 22 03 20.14 +04 16 08.1 23.4i 17MP42 T09 C~91XO 2016 08 28.32210 22 03 20.09 +04 16 08.1 23.6i 17MP42 T09 C~91XO 2017 06 24.46265 22 11 02.86 +04 53 35.1 23.3i 17MP42 T09 C~91XO 2017 06 24.48472 22 11 02.82 +04 53 35.4 23.5i 17MP42 T09 C~91XO 2017 06 24.49006 22 11 02.82 +04 53 35.4 23.3i 17MP42 T09 C~91XO 2017 06 24.49541 22 11 02.80 +04 53 35.4 23.2i 17MP42 T09 C~91XO 2017 07 19.42071 22 09 55.38 +04 54 16.3 22.9y 17MP42 T09 C~91XO 2017 07 19.43617 22 09 55.31 +04 54 16.3 22.8y 17MP42 T09 C~91XO 2017 07 19.44685 22 09 55.28 +04 54 16.3 22.5y 17MP42 T09 C~91XO 2017 07 21.214243 22 09 49.210 +04 54 05.90 24.3g 17MP42 W84 C~91XO 2017 08 22.136788 22 07 42.139 +04 46 23.52 23.8g 17MP42 W84 C~91XO
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 -0.08
2 0.0001 -1.29 0.19 0.39 0.06
3 0.0001 -1.78 -0.15 0.37 0.01
4 0.0001 -2.41 -0.14 0.40 -0.08
5 0.0819 -1928.40 0.12 165.86 0.05
6 0.0820 -1929.24 -0.07 165.76 -0.06
7 0.0820 -1929.84 -0.11 165.88 0.05
8 0.0820 -1930.19 0.10 165.80 -0.03
9 0.0820 -1930.33 0.14 165.86 0.02
10 0.0820 -1930.86 -0.01 165.74 -0.10
11 0.0820 -1931.55 -0.15 166.01 0.16
12 0.9038 5333.59 -0.08 -236.59 -0.00
13 0.9038 5333.14 0.00 -236.10 0.08
14 0.9039 5333.14 0.13 -236.10 -0.02
15 0.9039 5332.86 -0.02 -235.99 -0.02
16 0.9721 4406.99 0.06 164.94 -0.05
17 0.9722 4406.01 -0.14 165.32 0.12
18 0.9722 4405.59 -0.03 165.48 0.13
19 0.9770 4317.18 0.11 188.45 -0.08
20 1.0644 2378.40 -0.02 441.86 -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.
17MP42 quality flag:2 Type: SCATNEAR SCATNEAR 3:2E axisobj 39.673 39.846 39.534 ecceobj 0.179 0.187 0.174 incobj 15.488 15.490 15.486 qmin 31.580 30.630 30.340 qmax 48.169 49.360 48.925 amean 39.457 39.415 39.456 amin 38.849 38.796 39.046 amax 40.086 40.208 39.936 emean 0.171 0.165 0.199 emin 0.120 0.102 0.162 emax 0.203 0.229 0.228 imean 17.538 21.124 16.087 imin 16.678 16.906 15.232 imax 19.463 23.173 17.068 excite_mean 0.347 0.397 0.341 fracstop 1.000 1.000 1.000 cjmean 2.913 2.868 2.918 libcent 0 -180.0 -180.0 179.4 libamp 0 -180.0 -180.0 77.7 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 178.1 183.9 181.2 kozaiamp 180.0 179.8 180.0