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: 17GY8 # Created Fri Apr 19 01:18:21 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 77 observations of 77 # Arc: 3.11y # First observation: 2015/04/08 # Last observation: 2018/05/19 # Chi-squared of fit: 75.45 DOF: 148 RMS: 0.17 # Min/Max residuals: -0.44 0.52 # Exact a, adot, b, bdot, g, gdot: 4.218448E-05 3.349136E-01 -6.245650E-07 1.597197E-03 1.248719E-01 -8.262196E-02 # Covariance matrix: 4.9067E-13 -1.7943E-11 -3.9571E-14 9.3748E-12 3.0710E-12 -1.5302E-11 -1.7943E-11 1.9697E-09 5.7633E-12 -1.0448E-09 -2.2217E-10 1.7047E-09 -3.9571E-14 5.7633E-12 3.1660E-13 -3.2865E-12 -2.7285E-13 5.0385E-12 9.3748E-12 -1.0448E-09 -3.2865E-12 5.6174E-10 1.1618E-10 -9.0707E-10 3.0710E-12 -2.2217E-10 -2.7285E-13 1.1618E-10 5.7366E-11 -1.8977E-10 -1.5302E-11 1.7047E-09 5.0385E-12 -9.0707E-10 -1.8977E-10 1.4799E-09 # lat0 lon0 xBary yBary zBary JD0 14.637882 146.494924 -0.778683 0.157964 -0.604149 2457120.562630 # Heliocentric elements and errors Epoch: 2457120.5000 = 2015/04/08 Mean Anomaly: 357.02112 +/- 0.000 Argument of Peri: 116.52272 +/- 0.000 Long of Asc Node: 56.55651 +/- 0.000 Inclination: 13.58229 +/- 0.000 Eccentricity: 0.68455060 +/- 0.0000 Semi-Major Axis: 26.65823528 +/- 0.0014 Time of Perihelion: 2457536.5031 +/- 3.8 Perihelion: 8.40932426 +/- 0.0004 Aphelion: 44.90714629 +/- 0.0023 Period (y) 137.6434 +/- 0.01 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -7.41471702 +/- 0.0000 Ecliptic Y 3.97257931 +/- 0.0000 Ecliptic Z 2.02372485 +/- 0.0000 Ecliptic XDOT -0.00258784 +/- 0.0000 Ecliptic YDOT -0.00710123 +/- 0.0000 Ecliptic ZDOT -0.00042382 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 8.65192324 +/- 0.0000 Geocenter to KBO 8.00832016 +/- 0.0000 # Hcoef: 13.20
The following table shows the complete astrometric record for 17GY8. 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 (17GY8) followed by the observatory code and reference code for the source of the astrometry.
2015 04 08.061852 10 16 55.04 +26 22 44.3 17GY8 W84 C~3k4x 2015 04 08.067101 10 16 54.98 +26 22 44.1 17GY8 W84 C~3k4x 2015 04 12.075469 10 16 22.86 +26 19 20.8 17GY8 W84 C~3k4x 2015 04 12.076701 10 16 22.86 +26 19 20.8 17GY8 W84 C~3k4x 2015 12 18.60801 11 51 45.085 +15 11 35.20 22.8G 17GY8 F51 C~2r7d 2016 01 13.51297 11 54 26.124 +15 30 48.14 22.9G 17GY8 F51 C~2r7d 2016 02 04.43894 11 52 45.047 +16 06 32.92 21.3G 17GY8 F51 C~2r7d 2016 03 08.37032 11 44 58.929 +17 08 02.34 23.1G 17GY8 F51 C~2r7d 2016 03 10.35784 11 44 24.137 +17 11 10.12 22.2G 17GY8 F51 C~2r7d 2016 03 10.37067 11 44 23.912 +17 11 11.40 22.8G 17GY8 F51 C~2r7d 2016 03 10.38370 11 44 23.660 +17 11 12.77 21.1G 17GY8 F51 C~2r7d 2016 03 30.30657 11 38 37.114 +17 34 00.07 22.5G 17GY8 F51 C~2r7d 2016 03 30.32016 11 38 36.898 +17 34 00.60 22.4G 17GY8 F51 C~2r7d 2016 03 30.33373 11 38 36.655 +17 34 01.25 22.1G 17GY8 F51 C~2r7d 2016 03 30.34734 11 38 36.424 +17 34 01.82 22.4G 17GY8 F51 C~2r7d 2016 04 04.29686 11 37 17.000 +17 36 47.96 22.7G 17GY8 F51 C~2r7d 2016 04 04.30953 11 37 16.788 +17 36 48.35 22.8G 17GY8 F51 C~2r7d 2016 04 04.32224 11 37 16.599 +17 36 48.55 22.0G 17GY8 F51 C~2r7d 2016 04 04.33503 11 37 16.381 +17 36 49.12 22.8G 17GY8 F51 C~2r7d 2017 03 05.51632 13 00 22.625 +05 52 45.58 23.2w 17GY8 F51 C~2F9C 2017 03 05.52904 13 00 22.455 +05 52 46.58 23.3w 17GY8 F51 C~2F9C 2017 03 05.54177 13 00 22.292 +05 52 48.04 22.8w 17GY8 F51 C~2F9C 2017 03 05.55452 13 00 22.119 +05 52 49.22 22.7w 17GY8 F51 C~2F9C 2017 03 06.277766 13 00 12.66 +05 53 56.1 17GY8 W84 C~3k4x 2017 03 06.278987 13 00 12.63 +05 53 56.3 17GY8 W84 C~3k4x 2017 03 20.34600 12 56 43.110 +06 15 04.99 22.5w 17GY8 F51 C~2F9C 2017 03 20.35785 12 56 42.913 +06 15 05.76 22.1w 17GY8 F51 C~2F9C 2017 03 20.38156 12 56 42.514 +06 15 07.42 22.3w 17GY8 F51 C~2F9C 2017 03 29.39959 12 54 10.862 +06 27 30.16 22.5w 17GY8 F51 C~2F9C 2017 03 29.41185 12 54 10.648 +06 27 31.35 22.5w 17GY8 F51 C~2F9C 2017 03 29.42541 12 54 10.415 +06 27 32.02 22.8w 17GY8 F51 C~2F9C 2017 03 29.43773 12 54 10.186 +06 27 33.18 23.2w 17GY8 F51 C~2F9C 2017 03 31.233461 12 53 39.22 +06 29 49.7 17GY8 W84 C~3k4x 2017 03 31.235046 12 53 39.19 +06 29 49.9 17GY8 W84 C~3k4x 2017 04 03.46951 12 52 43.193 +06 33 40.06 21.9w 17GY8 F51 C~2F9C 2017 04 03.48341 12 52 42.942 +06 33 40.99 22.2w 17GY8 F51 C~2F9C 2017 04 03.49732 12 52 42.691 +06 33 41.90 22.0w 17GY8 F51 C~2F9C 2017 04 03.51127 12 52 42.451 +06 33 42.97 22.0w 17GY8 F51 C~2F9C 2017 04 04.297409 12 52 28.908 +06 34 36.17 22.0G 17GY8 568 C~2F9C 2017 04 04.298420 12 52 28.890 +06 34 36.30 21.8G 17GY8 568 C~2F9C 2017 04 04.299402 12 52 28.880 +06 34 36.31 21.9G 17GY8 568 C~2F9C 2017 04 16.30888 12 49 04.639 +06 45 39.17 22.1G 17GY8 F51 C~2r7d 2017 04 16.30952 12 49 04.615 +06 45 39.45 22.1w 17GY8 F51 C~2F9C 2017 04 16.32092 12 49 04.438 +06 45 39.93 22.3G 17GY8 F51 C~2r7d 2017 04 16.32156 12 49 04.437 +06 45 39.93 22.6G 17GY8 F51 C~2r7d 2017 04 16.33298 12 49 04.229 +06 45 40.27 22.3G 17GY8 F51 C~2r7d 2017 04 16.33362 12 49 04.224 +06 45 40.48 22.2w 17GY8 F51 C~2F9C 2017 04 16.34506 12 49 04.046 +06 45 40.80 22.2G 17GY8 F51 C~2r7d 2017 04 16.34570 12 49 04.018 +06 45 41.04 21.9w 17GY8 F51 C~2F9C 2017 04 20.37350 12 47 58.923 +06 48 10.37 22.7w 17GY8 F51 C~2F9C 2017 04 20.39487 12 47 58.572 +06 48 11.11 22.6w 17GY8 F51 C~2F9C 2017 04 20.40559 12 47 58.384 +06 48 11.42 22.6w 17GY8 F51 C~2F9C 2017 04 21.424071 12 47 42.353 +06 48 42.48 22.2G 17GY8 568 C~2F9C 2017 04 21.425286 12 47 42.334 +06 48 42.53 22.1G 17GY8 568 C~2F9C 2017 04 21.426497 12 47 42.313 +06 48 42.50 22.2G 17GY8 568 C~2F9C 2017 04 21.55476 12 47 40.28 +06 48 47.6 17GY8 Q62 C~2F9C 2017 04 21.56082 12 47 40.20 +06 48 47.9 17GY8 Q62 C~2F9C 2017 04 21.56689 12 47 40.10 +06 48 48.0 22.1w 17GY8 Q62 C~2F9C 2017 04 27.31581 12 46 13.535 +06 50 49.32 22.1G 17GY8 F51 C~2r7d 2017 04 27.32951 12 46 13.349 +06 50 49.47 22.7G 17GY8 F51 C~2r7d 2017 04 27.34327 12 46 13.124 +06 50 49.81 22.2G 17GY8 F51 C~2r7d 2018 03 17.56356 14 03 41.932 -04 33 53.23 23.2G 17GY8 F51 C~2r7d 2018 03 17.57601 14 03 41.785 -04 33 52.85 22.6G 17GY8 F51 C~2r7d 2018 03 17.58846 14 03 41.642 -04 33 51.83 23.2G 17GY8 F51 C~2r7d 2018 03 17.60084 14 03 41.508 -04 33 51.34 23.0G 17GY8 F51 C~2r7d 2018 03 18.47792 14 03 31.098 -04 33 00.64 22.7G 17GY8 F51 C~2r7d 2018 03 18.48976 14 03 30.949 -04 32 59.55 23.0G 17GY8 F51 C~2r7d 2018 03 18.50165 14 03 30.792 -04 32 59.20 22.6G 17GY8 F51 C~2r7d 2018 03 18.51355 14 03 30.645 -04 32 58.55 22.1G 17GY8 F51 C~2r7d 2018 04 13.42562 13 57 02.605 -04 06 17.27 22.6G 17GY8 F51 C~2r7d 2018 04 13.43759 13 57 02.431 -04 06 17.11 23.0G 17GY8 F51 C~2r7d 2018 04 13.44958 13 57 02.217 -04 06 16.29 23.1G 17GY8 F51 C~2r7d 2018 04 13.46159 13 57 01.999 -04 06 15.52 22.2G 17GY8 F51 C~2r7d 2018 05 19.33398 13 47 26.339 -03 43 23.02 21.8G 17GY8 F51 C~2r7d 2018 05 19.34594 13 47 26.154 -03 43 23.28 22.7G 17GY8 F51 C~2r7d 2018 05 19.35794 13 47 26.009 -03 43 23.47 22.8G 17GY8 F51 C~2r7d 2018 05 19.36994 13 47 25.845 -03 43 23.55 22.8G 17GY8 F51 C~2r7d
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 0.12 0.00 0.14
2 0.0000 0.00 -0.05 0.00 0.17
3 0.0110 0.00 -0.24 0.00 0.07
4 0.0110 0.00 -0.10 0.00 0.14
5 0.6969 0.00 -0.34 0.00 0.04
6 0.7678 0.00 0.20 0.00 -0.11
7 0.8279 0.00 0.05 0.00 -0.19
8 0.9180 0.00 0.09 0.00 -0.04
9 0.9235 0.00 0.04 0.00 -0.05
10 0.9235 0.00 0.13 0.00 0.03
11 0.9235 0.00 -0.14 0.00 0.18
12 0.9781 0.00 -0.01 0.00 -0.07
13 0.9781 0.00 0.19 0.00 -0.11
14 0.9782 0.00 -0.00 0.00 -0.03
15 0.9782 0.00 -0.01 0.00 -0.04
16 0.9917 0.00 0.20 0.00 -0.05
17 0.9918 0.00 0.06 0.00 0.00
18 0.9918 0.00 0.28 0.00 -0.14
19 0.9918 0.00 0.08 0.00 0.10
20 1.9095 0.00 -0.25 0.00 -0.11
21 1.9096 0.00 -0.23 0.00 -0.27
22 1.9096 0.00 -0.10 0.00 0.03
23 1.9096 0.00 -0.12 0.00 0.05
24 1.9116 0.00 0.18 0.00 0.03
25 1.9116 0.00 -0.02 0.00 0.11
26 1.9501 0.00 -0.13 0.00 0.38
27 1.9502 0.00 -0.13 0.00 0.12
28 1.9502 0.00 -0.20 0.00 -0.29
29 1.9749 0.00 -0.26 0.00 -0.23
30 1.9749 0.00 -0.23 0.00 0.02
31 1.9750 0.00 -0.13 0.00 -0.36
32 1.9750 0.00 -0.30 0.00 -0.14
33 1.9799 0.00 0.05 0.00 -0.08
34 1.9799 0.00 0.02 0.00 0.01
35 1.9888 0.00 0.18 0.00 0.04
36 1.9888 0.00 0.12 0.00 0.02
37 1.9889 0.00 0.07 0.00 -0.02
38 1.9889 0.00 0.18 0.00 0.09
39 1.9911 0.00 0.01 0.00 -0.11
40 1.9911 0.00 0.01 0.00 -0.05
41 1.9911 0.00 0.12 0.00 -0.10
42 2.0239 0.00 -0.06 0.00 -0.23
43 2.0239 0.00 -0.26 0.00 0.02
44 2.0240 0.00 -0.04 0.00 0.02
45 2.0240 0.00 0.11 0.00 -0.01
46 2.0240 0.00 -0.12 0.00 -0.15
47 2.0240 0.00 -0.03 0.00 0.03
48 2.0240 0.00 0.19 0.00 -0.13
49 2.0240 0.00 -0.07 0.00 0.08
50 2.0351 0.00 0.06 0.00 0.19
51 2.0351 0.00 0.02 0.00 0.24
52 2.0352 0.00 -0.18 0.00 0.21
53 2.0380 0.00 0.15 0.00 0.02
54 2.0380 0.00 0.15 0.00 0.04
55 2.0380 0.00 0.13 0.00 -0.03
56 2.0383 0.00 -0.44 0.00 0.36
57 2.0383 0.00 -0.18 0.00 0.48
58 2.0383 0.00 -0.22 0.00 0.41
59 2.0541 0.00 -0.02 0.00 -0.25
60 2.0541 0.00 0.25 0.00 -0.29
61 2.0542 0.00 -0.05 0.00 -0.14
62 2.9418 0.00 -0.15 0.00 0.05
63 2.9419 0.00 -0.08 0.00 -0.29
64 2.9419 0.00 0.05 0.00 0.02
65 2.9419 0.00 0.30 0.00 -0.21
66 2.9443 0.00 0.01 0.00 -0.05
67 2.9444 0.00 -0.01 0.00 0.36
68 2.9444 0.00 -0.15 0.00 0.02
69 2.9444 0.00 -0.13 0.00 -0.02
70 3.0154 0.00 -0.28 0.00 0.39
71 3.0154 0.00 0.22 0.00 -0.17
72 3.0154 0.00 0.13 0.00 -0.06
73 3.0155 0.00 -0.01 0.00 -0.01
74 3.1137 0.00 0.27 0.00 0.52
75 3.1137 0.00 -0.06 0.00 0.16
76 3.1137 0.00 0.23 0.00 -0.13
77 3.1138 0.00 0.22 0.00 -0.31
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.
17GY8 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 26.411 26.411 26.412 ecceobj 0.679 0.679 0.679 incobj 13.552 13.552 13.552 qmin 8.282 8.306 8.306 qmax 44.344 44.985 48.081 amean 25.888 26.266 27.129 amin 25.383 25.665 25.675 amax 26.411 26.767 28.249 emean 0.676 0.679 0.690 emin 0.665 0.676 0.677 emax 0.681 0.681 0.702 imean 12.887 12.767 12.882 imin 12.617 12.617 12.617 imax 13.270 12.950 13.077 excite_mean 0.712 0.714 0.725 fracstop 0.000 0.000 0.001 cjmean 2.493 2.481 2.447 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 120.0 118.9 125.0 kozaiamp 4.2 2.3 7.9