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: 17HQ108 # Created Wed May 8 01:18:09 2024 # Orbit generated from Bernstein formalism # Fitting 21 observations of 21 # Arc: 82.83d # First observation: 2017/02/02 # Last observation: 2017/04/26 Preliminary a, adot, b, bdot, g, gdot: -0.000018 0.051433 0.000042 -0.002724 0.032405 0.000000 # Chi-squared of fit: 8.16 DOF: 36 RMS: 0.11 # Min/Max residuals: -0.21 0.22 # Exact a, adot, b, bdot, g, gdot: 2.108185E-05 4.059043E-02 -4.428645E-08 -1.975147E-03 3.069310E-02 -7.245832E-03 # Covariance matrix: 3.5820E-13 -1.2241E-12 -2.6915E-16 -1.1355E-14 6.1485E-13 1.0520E-10 -1.2241E-12 5.4729E-09 2.1113E-11 -3.8106E-10 7.2668E-10 -5.4655E-08 -2.6915E-16 2.1113E-11 3.3462E-13 -2.7881E-12 2.8046E-12 -2.1184E-10 -1.1355E-14 -3.8106E-10 -2.7881E-12 3.6067E-11 -5.0713E-11 3.8071E-09 6.1485E-13 7.2668E-10 2.8046E-12 -5.0713E-11 1.0011E-10 -6.6615E-09 1.0520E-10 -5.4655E-08 -2.1184E-10 3.8071E-09 -6.6615E-09 6.5383E-07 # lat0 lon0 xBary yBary zBary JD0 -9.368082 153.891264 0.346814 -0.150140 -0.911098 2457787.007031 # Heliocentric elements and errors Epoch: 2457780.5000 = 2017/01/27 Mean Anomaly: 352.73923 +/- 0.598 Argument of Peri: 282.98318 +/- 2.479 Long of Asc Node: 260.75468 +/- 0.029 Inclination: 9.54199 +/- 0.002 Eccentricity: 0.56190736 +/- 0.0178 Semi-Major Axis: 72.72048105 +/- 2.2608 Time of Perihelion: 2462348.8938 +/- 310.2 Perihelion: 31.85830724 +/- 1.6277 Aphelion: 113.58265485 +/- 3.7600 Period (y) 620.1451 +/- 28.92 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -29.54605114 +/- 0.0094 Ecliptic Y 14.85973751 +/- 0.0046 Ecliptic Z -5.30336859 +/- 0.0017 Ecliptic XDOT -0.00099206 +/- 0.0001 Ecliptic YDOT -0.00355120 +/- 0.0000 Ecliptic ZDOT -0.00006869 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 33.49487506 +/- 0.0086 Geocenter to KBO 32.58061323 +/- 0.0106 # Hcoef: 8.27
The following table shows the complete astrometric record for 17HQ108. 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 (17HQ108) followed by the observatory code and reference code for the source of the astrometry.
2017 02 02.50623 10 09 36.68 +01 20 21.5 23.5r 17HQ108 T09 C~7xUY 2017 02 02.51587 10 09 36.63 +01 20 22.1 23.4r 17HQ108 T09 C~7xUY 2017 02 02.52702 10 09 36.59 +01 20 22.1 23.4r 17HQ108 T09 C~7xUY 2017 02 02.59348 10 09 36.23 +01 20 23.6 23.1i 17HQ108 T09 C~7xUY 2017 03 04.32155 10 06 55.62 +01 34 11.0 23.0z 17HQ108 T09 C~7xUY 2017 03 04.34714 10 06 55.47 +01 34 11.9 23.0z 17HQ108 T09 C~7xUY 2017 03 04.50300 10 06 54.62 +01 34 16.8 23.2i 17HQ108 T09 C~7xUY 2017 03 22.39453 10 05 26.90 +01 44 03.4 23.1z 17HQ108 T09 C~7xUY 2017 03 22.42021 10 05 26.79 +01 44 04.1 23.0z 17HQ108 T09 C~7xUY 2017 03 22.44588 10 05 26.66 +01 44 05.1 22.9z 17HQ108 T09 C~7xUY 2017 03 22.47157 10 05 26.55 +01 44 05.9 22.9z 17HQ108 T09 C~7xUY 2017 03 22.49332 10 05 26.46 +01 44 06.4 23.0z 17HQ108 T09 C~7xUY 2017 04 26.23645 10 03 42.82 +02 00 44.2 23.7i 17HQ108 T09 C~7xUY 2017 04 26.24028 10 03 42.82 +02 00 44.4 23.7i 17HQ108 T09 C~7xUY 2017 04 26.24413 10 03 42.81 +02 00 44.7 23.6i 17HQ108 T09 C~7xUY 2017 04 26.26326 10 03 42.79 +02 00 44.9 23.8i 17HQ108 T09 C~7xUY 2017 04 26.29400 10 03 42.75 +02 00 45.4 23.6i 17HQ108 T09 C~7xUY 2017 04 26.29783 10 03 42.74 +02 00 45.6 23.5i 17HQ108 T09 C~7xUY 2017 04 26.32635 10 03 42.71 +02 00 46.1 24.4g 17HQ108 T09 C~7xUY 2017 04 26.33018 10 03 42.70 +02 00 46.4 24.3g 17HQ108 T09 C~7xUY 2017 04 26.33400 10 03 42.70 +02 00 46.4 24.3g 17HQ108 T09 C~7xUZ
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 -0.04 0.00 -0.20
2 0.0000 -0.91 -0.16 0.29 0.17
3 0.0001 -1.47 0.19 0.08 0.05
4 0.0002 -7.05 0.05 -0.45 0.05
5 0.0816 -2552.22 0.10 -87.77 0.04
6 0.0817 -2554.64 -0.09 -87.74 0.04
7 0.0821 -2568.30 -0.20 -87.71 -0.11
8 0.1311 -4006.66 0.01 -9.18 0.05
9 0.1312 -4008.46 0.14 -9.11 -0.05
10 0.1313 -4010.63 -0.11 -8.87 0.02
11 0.1313 -4012.46 -0.02 -8.71 0.02
12 0.1314 -4013.90 0.17 -8.73 -0.14
13 0.2265 -5822.42 -0.11 369.32 -0.09
14 0.2265 -5822.49 -0.07 369.50 0.05
15 0.2265 -5822.74 -0.21 369.73 0.22
16 0.2266 -5823.09 -0.03 369.81 0.05
17 0.2267 -5823.83 0.08 370.06 -0.11
18 0.2267 -5824.04 -0.02 370.20 -0.03
19 0.2267 -5824.64 0.17 370.50 -0.11
20 0.2268 -5824.89 0.03 370.73 0.07
21 0.2268 -5824.89 0.13 370.73 0.02
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.
17HQ108 quality flag:1 Type: 11:3EEEEEE CENTAURS SCATNEAR axisobj 71.596 76.598 68.290 ecceobj 0.554 0.593 0.524 incobj 9.525 9.522 9.528 qmin 31.097 29.932 31.890 qmax 114.701 159.219 107.653 amean 71.595 80.293 68.083 amin 70.460 66.200 65.720 amax 73.260 95.450 70.303 emean 0.555 0.608 0.510 emin 0.546 0.530 0.478 emax 0.566 0.668 0.535 imean 10.754 11.563 13.067 imin 10.351 9.365 10.954 imax 11.102 14.594 14.918 excite_mean 0.586 0.640 0.559 fracstop 1.000 1.000 1.000 cjmean 2.939 2.910 2.961 libcent 0 181.1 -180.0 -180.0 libamp 0 95.6 -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 148.9 186.1 174.2 kozaiamp 180.0 180.0 180.0