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 Sun Oct 19 01:11:49 2025 # Orbit generated from Bernstein formalism # Fitting 82 observations of 82 # Arc: 4.79y # First observation: 2013/04/03 # Last observation: 2018/01/17 Preliminary a, adot, b, bdot, g, gdot: -0.003241 0.039883 0.000203 -0.003072 0.031283 0.000000 # Chi-squared of fit: 35.71 DOF: 158 RMS: 0.12 # Min/Max residuals: -0.27 0.37 # Exact a, adot, b, bdot, g, gdot: 2.023743E-05 3.730083E-02 -1.397204E-06 -2.875244E-03 2.942014E-02 -1.052254E-02 # Covariance matrix: 1.1306E-12 -6.1616E-13 -5.1693E-14 3.6904E-14 -2.1789E-13 -2.0979E-12 -6.1616E-13 4.1499E-13 3.6434E-14 -2.8271E-14 1.0825E-13 1.6517E-12 -5.1693E-14 3.6434E-14 3.8434E-13 -1.1777E-13 1.3406E-14 1.5541E-13 3.6904E-14 -2.8271E-14 -1.1777E-13 3.8458E-14 -7.6438E-15 -1.2383E-13 -2.1789E-13 1.0825E-13 1.3406E-14 -7.6438E-15 9.5161E-14 3.9653E-13 -2.0979E-12 1.6517E-12 1.5541E-13 -1.2383E-13 3.9653E-13 7.2937E-12 # lat0 lon0 xBary yBary zBary JD0 -8.762471 143.515610 -0.765511 -0.098209 -0.637664 2456385.547693 # Heliocentric elements and errors Epoch: 2456380.5000 = 2013/03/29 Mean Anomaly: 350.50280 +/- 0.002 Argument of Peri: 284.60697 +/- 0.010 Long of Asc Node: 260.55243 +/- 0.002 Inclination: 9.52968 +/- 0.000 Eccentricity: 0.57248131 +/- 0.0001 Semi-Major Axis: 74.10050894 +/- 0.0090 Time of Perihelion: 2462526.9369 +/- 1.2 Perihelion: 31.67935249 +/- 0.0059 Aphelion: 116.52166538 +/- 0.0148 Period (y) 637.8815 +/- 0.12 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -27.98349546 +/- 0.0003 Ecliptic Y 19.74500330 +/- 0.0002 Ecliptic Z -5.17810610 +/- 0.0001 Ecliptic XDOT -0.00125940 +/- 0.0000 Ecliptic YDOT -0.00339021 +/- 0.0000 Ecliptic ZDOT -0.00011513 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 34.63746464 +/- 0.0003 Geocenter to KBO 33.99032377 +/- 0.0004 # Hcoef: 8.28
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.
2013 04 03.046915 09 31 49.327 +05 23 35.77 21.5z 17HQ108 W84 C~8HLF 2014 05 26.969084 09 39 37.572 +04 45 47.30 23.3r 17HQ108 W84 C~8HLF 2016 01 15.610219 10 02 37.10 +02 10 56.1 17HQ108 T09 C~83FH 2016 01 15.61408 10 02 37.08 +02 10 56.1 23.4z 17HQ108 T09 C~93TB 2016 01 15.61795 10 02 37.05 +02 10 56.4 23.6z 17HQ108 T09 C~93TB 2016 01 15.62179 10 02 37.04 +02 10 56.2 23.6z 17HQ108 T09 C~93TB 2016 01 15.62564 10 02 37.02 +02 10 56.4 23.5z 17HQ108 T09 C~93TB 2016 01 15.62949 10 02 37.01 +02 10 56.6 23.4z 17HQ108 T09 C~93TB 2016 01 15.63340 10 02 37.00 +02 10 56.6 23.4z 17HQ108 T09 C~93TB 2016 01 15.63725 10 02 36.97 +02 10 56.6 23.8z 17HQ108 T09 C~93TB 2016 01 15.64109 10 02 36.96 +02 10 56.4 23.3z 17HQ108 T09 C~93TB 2016 01 15.64496 10 02 36.94 +02 10 56.6 23.3z 17HQ108 T09 C~93TB 2016 01 15.64883 10 02 36.93 +02 10 56.4 23.3z 17HQ108 T09 C~93TB 2016 01 15.65269 10 02 36.91 +02 10 56.7 23.3z 17HQ108 T09 C~93TB 2016 01 15.65653 10 02 36.88 +02 10 56.7 23.4z 17HQ108 T09 C~93TB 2016 01 15.66041 10 02 36.88 +02 10 56.7 23.1z 17HQ108 T09 C~93TB 2016 01 15.66427 10 02 36.85 +02 10 56.7 23.3z 17HQ108 T09 C~93TB 2016 01 15.668933 10 02 36.85 +02 10 56.7 17HQ108 T09 C~83FH 2016 02 03.59257 10 01 05.36 +02 16 20.8 23.7y 17HQ108 T09 C~93TB 2016 02 03.60028 10 01 05.33 +02 16 21.2 23.1y 17HQ108 T09 C~93TB 2016 02 03.60418 10 01 05.31 +02 16 21.4 23.4y 17HQ108 T09 C~93TB 2016 02 03.60807 10 01 05.28 +02 16 21.2 23.5y 17HQ108 T09 C~93TB 2016 02 03.61191 10 01 05.26 +02 16 21.4 23.4y 17HQ108 T09 C~93TB 2016 02 03.61579 10 01 05.24 +02 16 21.5 23.0y 17HQ108 T09 C~93TB 2016 02 03.64656 10 01 05.08 +02 16 22.4 23.0y 17HQ108 T09 C~93TB 2016 02 03.65044 10 01 05.07 +02 16 22.5 23.6y 17HQ108 T09 C~93TB 2016 02 03.65430 10 01 05.05 +02 16 22.4 23.4y 17HQ108 T09 C~93TB 2016 02 03.65820 10 01 05.01 +02 16 22.4 23.1y 17HQ108 T09 C~93TB 2016 02 03.66204 10 01 05.00 +02 16 22.9 22.9y 17HQ108 T09 C~93TB 2016 02 05.299311 10 00 56.354 +02 16 59.88 21.7Y 17HQ108 W84 C~8HLF 2016 02 12.52322 10 00 17.41 +02 19 58.0 23.7y 17HQ108 T09 C~93TB 2016 02 12.52708 10 00 17.40 +02 19 58.0 23.4y 17HQ108 T09 C~93TB 2016 02 12.53094 10 00 17.37 +02 19 58.2 22.9y 17HQ108 T09 C~93TB 2016 02 12.53482 10 00 17.35 +02 19 58.2 23.3y 17HQ108 T09 C~93TB 2016 02 12.54254 10 00 17.31 +02 19 58.4 23.3y 17HQ108 T09 C~93TB 2016 02 12.54639 10 00 17.29 +02 19 58.4 23.1y 17HQ108 T09 C~93TB 2016 02 12.55025 10 00 17.25 +02 19 58.7 23.3y 17HQ108 T09 C~93TB 2016 03 07.27865 09 58 09.81 +02 31 40.8 24.5g 17HQ108 T09 C~89Up 2016 03 07.28866 09 58 09.76 +02 31 41.0 24.6g 17HQ108 T09 C~89Up 2016 03 07.29878 09 58 09.70 +02 31 41.5 24.6g 17HQ108 T09 C~89Up 2016 03 07.31730 09 58 09.60 +02 31 41.8 24.1g 17HQ108 T09 C~89Up 2016 03 07.32886 09 58 09.55 +02 31 42.5 24.6g 17HQ108 T09 C~89Up 2016 03 09.28942 09 57 59.66 +02 32 44.9 23.7r 17HQ108 T09 C~89Up 2016 03 09.29953 09 57 59.60 +02 32 45.2 23.7r 17HQ108 T09 C~89Up 2016 03 09.30973 09 57 59.55 +02 32 45.4 23.9r 17HQ108 T09 C~89Up 2016 03 09.32844 09 57 59.45 +02 32 46.1 23.9r 17HQ108 T09 C~89Up 2016 03 09.33236 09 57 59.43 +02 32 46.2 24.0r 17HQ108 T09 C~89Up 2016 03 09.33622 09 57 59.42 +02 32 46.4 24.3r 17HQ108 T09 C~89Up 2016 03 10.200424 09 57 55.118 +02 33 14.08 22.8z 17HQ108 W84 C~8HLF 2016 03 12.39109 09 57 44.34 +02 34 24.1 23.6z 17HQ108 T09 C~89Up 2016 03 12.40577 09 57 44.27 +02 34 24.6 23.5z 17HQ108 T09 C~89Up 2016 03 12.42050 09 57 44.20 +02 34 25.0 23.4z 17HQ108 T09 C~89Up 2016 03 12.46618 09 57 43.96 +02 34 26.7 24.1z 17HQ108 T09 C~89Up 2016 03 12.47390 09 57 43.93 +02 34 26.7 23.3z 17HQ108 T09 C~89Up 2016 03 15.44832 09 57 29.74 +02 36 02.2 22.8y 17HQ108 T09 C~89Up 2016 03 15.46258 09 57 29.68 +02 36 02.7 22.1y 17HQ108 T09 C~89Up 2016 03 15.50659 09 57 29.45 +02 36 04.0 23.4y 17HQ108 T09 C~89Up 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 03 23.100325 10 05 23.803 +01 44 26.59 23.8V 17HQ108 W84 C~8HLF 2017 03 24.117636 10 05 19.380 +01 44 59.82 23.1V 17HQ108 W84 C~8HLF 2017 03 26.053480 10 05 11.182 +01 46 02.53 23.9V 17HQ108 W84 C~8HLF 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 2018 01 17.632758 10 19 29.21 +00 19 06.3 17HQ108 T09 C~83FH
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 -0.03
2 1.1469 7356.94 0.11 110.56 0.17
3 2.7859 30122.48 0.10 -1925.61 -0.06
4 2.7859 30122.19 0.07 -1925.71 -0.11
5 2.7860 30121.66 -0.21 -1925.58 0.07
6 2.7860 30121.58 -0.03 -1925.82 -0.13
7 2.7860 30121.23 -0.13 -1925.72 0.00
8 2.7860 30121.01 -0.08 -1925.58 0.18
9 2.7860 30120.87 0.04 -1925.63 0.18
10 2.7860 30120.44 -0.14 -1925.78 0.07
11 2.7860 30120.36 0.04 -1926.02 -0.13
12 2.7860 30120.00 -0.05 -1925.93 0.00
13 2.7860 30119.92 0.13 -1926.17 -0.20
14 2.7861 30119.53 -0.00 -1925.99 0.03
15 2.7861 30119.10 -0.18 -1926.14 -0.08
16 2.7861 30119.10 0.08 -1926.14 -0.03
17 2.7861 30118.67 -0.09 -1926.29 -0.14
18 2.7861 30118.67 0.22 -1926.29 -0.09
19 2.8379 28688.69 -0.02 -2072.63 -0.21
20 2.8379 28688.12 0.07 -2072.40 0.06
21 2.8379 28687.77 0.04 -2072.31 0.17
22 2.8379 28687.40 0.00 -2072.65 -0.14
23 2.8380 28687.05 -0.03 -2072.56 -0.03
24 2.8380 28686.73 -0.02 -2072.56 -0.02
25 2.8381 28684.12 -0.04 -2072.50 0.21
26 2.8381 28683.94 0.11 -2072.46 0.27
27 2.8381 28683.68 0.18 -2072.65 0.10
28 2.8381 28683.11 -0.07 -2072.85 -0.08
29 2.8381 28682.79 -0.06 -2072.42 0.37
30 2.8426 28545.67 0.03 -2080.16 -0.03
31 2.8624 27924.44 -0.07 -2103.94 0.01
32 2.8624 27924.29 0.13 -2103.99 -0.03
33 2.8624 27923.79 -0.03 -2103.95 0.02
34 2.8624 27923.51 0.03 -2104.05 -0.07
35 2.8624 27922.86 0.07 -2104.06 -0.06
36 2.8624 27922.57 0.12 -2104.16 -0.15
37 2.8624 27921.90 -0.21 -2104.07 -0.05
38 2.9274 25852.64 -0.05 -2067.69 0.07
39 2.9274 25851.85 0.01 -2067.75 -0.04
40 2.9275 25850.82 -0.15 -2067.57 0.09
41 2.9275 25849.28 -0.11 -2067.78 -0.20
42 2.9275 25848.33 -0.08 -2067.36 0.16
43 2.9329 25685.33 0.06 -2056.97 0.07
44 2.9329 25684.37 -0.06 -2056.98 0.01
45 2.9330 25683.58 0.02 -2057.04 -0.10
46 2.9330 25681.91 -0.08 -2056.87 -0.03
47 2.9330 25681.59 -0.07 -2056.87 -0.05
48 2.9330 25681.38 0.04 -2056.73 0.07
49 2.9354 25610.31 0.33 -2051.70 -0.02
50 2.9414 25432.06 -0.01 -2038.45 -0.08
51 2.9414 25430.88 0.03 -2038.32 -0.04
52 2.9415 25429.74 0.09 -2038.28 -0.10
53 2.9416 25425.73 -0.19 -2037.85 0.06
54 2.9416 25425.30 0.01 -2038.00 -0.13
55 2.9498 25189.57 0.02 -2017.40 0.00
56 2.9498 25188.54 0.12 -2017.22 0.09
57 2.9499 25184.80 -0.14 -2017.12 -0.12
58 3.8370 37249.12 -0.02 -2730.81 -0.17
59 3.8370 37248.19 -0.14 -2730.49 0.21
60 3.8370 37247.60 0.22 -2730.69 0.08
61 3.8372 37241.83 0.07 -2731.06 0.08
62 3.9186 34617.83 0.09 -2742.68 0.13
63 3.9187 34615.34 -0.11 -2742.57 0.14
64 3.9191 34601.31 -0.22 -2742.13 -0.01
65 3.9681 33127.22 0.05 -2619.22 0.12
66 3.9682 33125.39 0.19 -2619.10 0.02
67 3.9682 33123.16 -0.07 -2618.79 0.10
68 3.9683 33121.29 0.03 -2618.58 0.09
69 3.9684 33119.82 0.21 -2618.55 -0.07
70 3.9700 33074.40 0.14 -2612.51 0.03
71 3.9728 32998.93 0.09 -2602.81 0.06
72 3.9781 32858.70 0.27 -2583.78 -0.01
73 4.0635 31279.60 -0.18 -2182.15 -0.15
74 4.0635 31279.54 -0.14 -2181.96 -0.02
75 4.0635 31279.29 -0.27 -2181.72 0.16
76 4.0636 31278.93 -0.09 -2181.63 -0.02
77 4.0636 31278.19 0.02 -2181.35 -0.19
78 4.0637 31277.97 -0.09 -2181.21 -0.10
79 4.0637 31277.37 0.11 -2180.88 -0.18
80 4.0637 31277.12 -0.03 -2180.64 -0.00
81 4.0638 31277.12 0.07 -2180.64 -0.06
82 4.7928 47257.81 -0.05 -3284.84 0.01
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:2 Type: SCATNEAR CENTAURS SCATNEAR axisobj 73.457 73.478 73.437 ecceobj 0.568 0.568 0.568 incobj 9.523 9.523 9.523 qmin 31.092 30.192 31.101 qmax 119.227 124.526 120.456 amean 72.325 71.027 72.160 amin 69.101 63.084 68.042 amax 76.020 78.495 76.159 emean 0.546 0.553 0.547 emin 0.525 0.505 0.519 emax 0.580 0.589 0.583 imean 14.312 11.199 13.627 imin 10.945 8.832 10.943 imax 16.350 14.098 15.469 excite_mean 0.600 0.587 0.596 fracstop 1.000 1.000 1.000 cjmean 2.931 2.931 2.935 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 180.2 183.5 177.6 kozaiamp 179.9 180.0 180.0