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: 17DD170
# Created Sun Dec 22 02:10:58 2024
# Orbit generated from Bernstein formalism
# Fitting 19 observations of 19
# Arc: 4.02y
# First observation: 2015/03/30
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000105 0.023955 -0.000077 0.012356 0.026171 0.000000
# Chi-squared of fit: 6.10 DOF: 32 RMS: 0.10
# Min/Max residuals: -0.17 0.34
# Exact a, adot, b, bdot, g, gdot:
1.370393E-05 2.382294E-02 7.484081E-06 1.230034E-02 2.661959E-02 -9.971079E-04
# Covariance matrix:
3.8934E-13 -3.1849E-13 7.3156E-14 -1.1088E-13 -8.1450E-14 -2.1999E-12
-3.1849E-13 4.3275E-13 -1.2150E-13 1.8336E-13 -7.4473E-15 3.6474E-12
7.3156E-14 -1.2150E-13 2.8664E-13 -1.5646E-13 -1.0734E-14 -1.1830E-12
-1.1088E-13 1.8336E-13 -1.5646E-13 1.4522E-13 1.9593E-14 1.7877E-12
-8.1450E-14 -7.4473E-15 -1.0734E-14 1.9593E-14 6.1075E-13 3.4925E-13
-2.1999E-12 3.6474E-12 -1.1830E-12 1.7877E-12 3.4925E-13 3.5533E-11
# lat0 lon0 xBary yBary zBary JD0
2.589836 -173.055998 -0.038577 0.045077 -0.993769 2457111.857159
# Heliocentric elements and errors
Epoch: 2457110.5000 = 2015/03/29
Mean Anomaly: 264.98696 +/- 0.163
Argument of Peri: 104.54664 +/- 0.147
Long of Asc Node: 182.11515 +/- 0.000
Inclination: 27.35729 +/- 0.000
Eccentricity: 0.03557204 +/- 0.0002
Semi-Major Axis: 38.39606262 +/- 0.0047
Time of Perihelion: 2480046.0513 +/- 39.2
Perihelion: 37.03023628 +/- 0.0097
Aphelion: 39.76188897 +/- 0.0099
Period (y) 237.9240 +/- 0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -38.23858945 +/- 0.0011
Ecliptic Y -4.69580600 +/- 0.0001
Ecliptic Z 1.69776234 +/- 0.0001
Ecliptic XDOT 0.00045136 +/- 0.0000
Ecliptic YDOT -0.00241879 +/- 0.0000
Ecliptic ZDOT 0.00125926 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 38.56323008 +/- 0.0011
Geocenter to KBO 37.56631528 +/- 0.0011
# Hcoef: 7.93
The following table shows the complete astrometric record for 17DD170. 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 (17DD170) followed by the observatory code and reference code for the source of the astrometry.
2015 03 30.356381 12 29 35.87 -00 22 38.2 17DD170 T09 C~89UX 2015 03 30.369488 12 29 35.80 -00 22 37.6 17DD170 T09 C~89UX 2015 03 30.395233 12 29 35.68 -00 22 36.7 17DD170 T09 C~89UX 2016 04 04.442534 12 35 16.86 -00 12 30.1 17DD170 T09 C~89UX 2016 04 04.44255 12 35 16.85 -00 12 30.0 24.5g 17DD170 T09 C~8COu 2016 04 04.54513 12 35 16.35 -00 12 26.3 24.5g 17DD170 T09 C~8COu 2016 04 04.555772 12 35 16.31 -00 12 26.0 17DD170 T09 C~89UX 2017 02 21.49884 12 44 31.55 -00 32 26.5 23.3z 17DD170 T09 C~89UX 2017 02 21.51504 12 44 31.51 -00 32 26.3 24.1z 17DD170 T09 C~89UX 2017 02 21.52038 12 44 31.46 -00 32 26.0 23.5z 17DD170 T09 C~89UX 2017 02 21.53656 12 44 31.42 -00 32 25.3 23.6z 17DD170 T09 C~89UX 2017 02 21.56614 12 44 31.31 -00 32 24.3 23.6z 17DD170 T09 C~89UX 2017 02 23.54421 12 44 24.32 -00 31 16.6 24.0r 17DD170 T09 C~89UX 2017 02 23.61219 12 44 24.06 -00 31 14.3 23.9r 17DD170 T09 C~89UX 2017 02 23.64192 12 44 23.96 -00 31 13.1 24.0r 17DD170 T09 C~89UX 2017 04 27.380876 12 39 43.12 +00 07 06.5 17DD170 T09 C~89UX 2019 02 06.338140 12 57 30.062 -00 27 38.92 22.9g 17DD170 W84 C~8HKW 2019 04 06.416374 12 53 41.88 +00 07 46.9 17DD170 T09 C~89UX 2019 04 06.528515 12 53 41.33 +00 07 51.2 17DD170 T09 C~89UX
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 0.09 0.00 -0.04
2 0.0000 -1.20 -0.03 0.14 0.02
3 0.0001 -3.21 0.08 0.25 -0.03
4 1.0160 4460.13 0.01 2578.57 0.04
5 1.0160 4459.95 -0.17 2578.61 0.07
6 1.0163 4451.60 -0.14 2579.04 -0.09
7 1.0163 4450.93 0.05 2579.08 -0.11
8 1.9005 12594.35 -0.05 4768.13 0.20
9 1.9005 12593.71 0.34 4768.08 -0.02
10 1.9005 12592.90 -0.14 4768.06 -0.10
11 1.9006 12592.07 0.04 4768.47 0.15
12 1.9006 12590.15 -0.02 4768.73 0.12
13 1.9061 12466.63 0.00 4789.56 0.00
14 1.9062 12462.13 -0.10 4790.13 -0.10
15 1.9063 12460.27 -0.04 4790.64 0.11
16 2.0781 7669.39 0.07 5239.32 -0.13
17 3.8576 23309.73 -0.01 9677.60 0.01
18 4.0193 19280.36 0.04 10275.98 -0.08
19 4.0196 19270.99 -0.01 10276.66 0.00
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.
17DD170 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 38.113 38.127 38.099 ecceobj 0.038 0.037 0.038 incobj 27.482 27.481 27.482 qmin 36.424 36.433 36.419 qmax 40.286 40.274 40.324 amean 38.278 38.290 38.264 amin 38.001 38.015 37.990 amax 38.565 38.575 38.545 emean 0.034 0.034 0.033 emin 0.024 0.024 0.023 emax 0.046 0.045 0.046 imean 27.440 27.439 27.440 imin 26.918 26.933 26.935 imax 28.045 28.011 28.039 excite_mean 0.462 0.462 0.462 fracstop 1.000 1.000 1.000 cjmean 2.788 2.788 2.788 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 179.8 184.0 179.1 kozaiamp 180.0 180.0 179.9