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: 17WH30 # Created Wed Dec 25 02:10:57 2024 # Orbit generated from Bernstein formalism # Fitting 26 observations of 28 # Arc: 3.97y # First observation: 2017/11/17 # Last observation: 2021/11/05 Preliminary a, adot, b, bdot, g, gdot: -0.000149 0.013231 0.000024 -0.002833 0.016771 0.000000 # Chi-squared of fit: 23.34 DOF: 46 RMS: 0.17 # Min/Max residuals: -0.50 0.42 # Exact a, adot, b, bdot, g, gdot: 8.291710E-06 1.273335E-02 -3.586389E-06 -2.736871E-03 1.693933E-02 -8.736311E-03 # Covariance matrix: 1.8135E-13 -2.0291E-13 -1.7180E-14 3.2144E-14 1.0235E-13 -2.7288E-12 -2.0291E-13 6.2134E-13 3.3355E-14 -1.1547E-13 8.0625E-15 1.0380E-11 -1.7180E-14 3.3355E-14 8.3141E-14 -3.5842E-14 -1.4880E-14 5.4104E-13 3.2144E-14 -1.1547E-13 -3.5842E-14 5.9363E-14 -5.9664E-15 -2.0639E-12 1.0235E-13 8.0625E-15 -1.4880E-14 -5.9664E-15 2.2040E-13 8.7473E-13 -2.7288E-12 1.0380E-11 5.4104E-13 -2.0639E-12 8.7473E-13 1.8666E-10 # lat0 lon0 xBary yBary zBary JD0 -13.785237 68.596864 0.234809 -0.230141 -0.938847 2458074.760181 # Heliocentric elements and errors Epoch: 2458070.5000 = 2017/11/13 Mean Anomaly: 329.79103 +/- 0.080 Argument of Peri: 329.56518 +/- 0.011 Long of Asc Node: 200.87507 +/- 0.002 Inclination: 18.12567 +/- 0.001 Eccentricity: 0.61440781 +/- 0.0009 Semi-Major Axis: 85.42018914 +/- 0.1442 Time of Perihelion: 2482268.1223 +/- 19.6 Perihelion: 32.93735773 +/- 0.0954 Aphelion: 137.90302055 +/- 0.2454 Period (y) 789.4943 +/- 2.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 21.49152931 +/- 0.0006 Ecliptic Y 54.18833252 +/- 0.0015 Ecliptic Z -14.06714346 +/- 0.0004 Ecliptic XDOT -0.00244954 +/- 0.0000 Ecliptic YDOT -0.00062919 +/- 0.0000 Ecliptic ZDOT -0.00009328 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 59.96787255 +/- 0.0014 Geocenter to KBO 59.03422367 +/- 0.0016 # Hcoef: 6.68
The following table shows the complete astrometric record for 17WH30. 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 (17WH30) followed by the observatory code and reference code for the source of the astrometry.
2017 11 17.25938 04 36 05.483 +08 06 32.39 24.3r 17WH30 807 C~2yg0 2017 11 17.25939 04 36 05.44 +08 06 32.2 25.0V 17WH30 W84 C~30Lu 2017 11 17.26470 04 36 05.417 +08 06 32.07 24.3r 17WH30 807 C~2yg0 2017 11 18.24579 04 36 02.06 +08 06 20.1 17WH30 W84 C~30Lu 2017 11 18.25191 04 36 02.015 +08 06 19.95 24.4r 17WH30 807 C~2yg0 2017 11 18.26354 04 36 02.030 +08 06 19.87 24.3r 17WH30 807 C~2yg0 2017 11 18.26355 04 36 01.99 +08 06 19.8 17WH30 W84 C~30Lu 2017 11 21.21549 04 35 51.766 +08 05 44.59 24.2r 17WH30 304 C~2yg0 2017 11 22.22533 04 35 48.227 +08 05 33.02 24.3r 17WH30 304 C~2yg0 2017 12 13.14260 04 34 34.012 +08 02 28.95 24.3r 17WH30 304 C~2yg0 2017 12 14.12789 04 34 30.549 +08 02 22.98 24.2r 17WH30 304 C~2yg0 2018 02 06.11806 04 32 14.123 +08 04 11.99 17WH30 G37 C~2yg0 2018 02 06.17380 04 32 14.045 +08 04 12.52 17WH30 G37 C~2yg0 2018 02 06.22865 04 32 13.950 +08 04 13.31 24.3R 17WH30 G37 C~2yg0 2018 03 07.12209 04 32 10.567 +08 10 06.78 17WH30 G37 C~2yg0 2018 03 07.12961 04 32 10.569 +08 10 06.76 17WH30 G37 C~2yg0 2018 03 07.20150 04 32 10.629 +08 10 07.78 17WH30 G37 C~2yg0 2018 03 07.20878 04 32 10.638 +08 10 07.83 17WH30 G37 C~2yg0 2018 03 07.21618 04 32 10.646 +08 10 07.90 17WH30 G37 C~2yg0 2018 11 09.31532 04 39 34.229 +08 05 20.69 17WH30 G37 C~2yg0 2018 11 09.32369 04 39 34.220 +08 05 20.53 17WH30 G37 C~2yg0 2018 11 09.38665 04 39 34.050 +08 05 19.94 17WH30 G37 C~2yg0 2018 11 09.39503 04 39 33.994 +08 05 19.99 17WH30 G37 C~2yg0 2018 12 08.20804 04 37 53.251 +08 00 04.41 24.3r 17WH30 304 C~2yg0 2018 12 08.25798 04 37 53.076 +08 00 03.88 17WH30 304 C~2yg0 2021 11 05.412690 04 49 10.419 +07 56 32.32 24.1G 17WH30 G37 C~5BiB 2021 11 05.454110 04 49 10.284 +07 56 31.69 17WH30 G37 C~5BiB 2021 11 05.495790 04 49 10.164 +07 56 31.10 17WH30 G37 C~5BiB
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 ( 0.74) 0.00 ( 0.21)
2 0.0000 -0.66 0.08 -0.09 0.12
3 0.0000 -1.02 0.01 -0.17 0.07
4 0.0027 -52.08 0.14 -4.70 0.15
5 0.0027 -52.77 -0.22 -4.75 0.12
6 0.0027 -52.56 ( 0.61) -4.87 ( 0.06)
7 0.0027 -53.16 0.01 -4.85 0.08
8 0.0108 -208.51 0.06 -17.40 -0.04
9 0.0136 -262.19 -0.04 -21.13 -0.02
10 0.0709 -1379.51 0.26 -40.98 0.08
11 0.0736 -1431.27 -0.04 -39.29 -0.00
12 0.2214 -3419.20 0.13 368.99 -0.02
13 0.2215 -3420.27 -0.07 369.69 0.02
14 0.2217 -3421.54 -0.50 370.68 0.37
15 0.3008 -3418.56 0.12 727.74 0.08
16 0.3008 -3418.54 0.04 727.72 -0.04
17 0.3010 -3417.50 0.03 728.59 -0.05
18 0.3010 -3417.36 0.07 728.62 -0.11
19 0.3010 -3417.24 0.09 728.67 -0.15
20 0.9776 3056.73 -0.42 -522.23 -0.16
21 0.9776 3056.58 -0.16 -522.37 -0.24
22 0.9778 3053.99 0.42 -522.59 -0.03
23 0.9778 3053.18 0.03 -522.42 0.19
24 1.0567 1526.76 -0.07 -617.64 -0.23
25 1.0568 1524.11 0.00 -617.79 -0.40
26 3.9676 11466.06 0.00 -2259.67 0.08
27 3.9677 11463.98 -0.06 -2260.01 0.07
28 3.9678 11462.13 0.11 -2260.35 0.07
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.
17WH30 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 86.442 86.862 86.029 ecceobj 0.613 0.615 0.610 incobj 18.013 18.013 18.014 qmin 30.764 31.566 31.563 qmax 149.847 153.274 149.074 amean 87.698 88.125 86.076 amin 84.400 84.413 81.760 amax 90.902 92.851 90.745 emean 0.633 0.625 0.614 emin 0.605 0.601 0.583 emax 0.652 0.651 0.643 imean 15.783 18.096 18.037 imin 13.894 16.640 16.183 imax 18.425 19.895 19.691 excite_mean 0.689 0.698 0.688 fracstop 1.000 1.000 1.000 cjmean 2.885 2.880 2.885 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 202.9 188.9 169.7 kozaiamp 179.9 180.0 180.0