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: 17DC170
# Created Mon Apr 28 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting 23 observations of 24
# Arc: 4.01y
# First observation: 2015/03/30
# Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
-0.000096 0.019517 -0.000001 -0.000024 0.021476 0.000000
# Chi-squared of fit: 10.33 DOF: 40 RMS: 0.12
# Min/Max residuals: -0.24 0.32
# Exact a, adot, b, bdot, g, gdot:
1.406679E-05 1.940214E-02 -1.675394E-07 -2.373618E-05 2.171187E-02 -1.446062E-03
# Covariance matrix:
4.3851E-13 -4.5053E-13 -3.3009E-17 8.2718E-16 -3.1243E-14 -4.5572E-12
-4.5053E-13 6.9432E-13 -8.5342E-17 -1.8685E-15 -5.5317E-14 8.4685E-12
-3.3009E-17 -8.5342E-17 2.6627E-13 -1.3289E-13 7.8036E-16 4.3418E-16
8.2718E-16 -1.8685E-15 -1.3289E-13 8.7232E-14 1.6667E-15 -2.2917E-14
-3.1243E-14 -5.5317E-14 7.8036E-16 1.6667E-15 6.0377E-13 4.8743E-13
-4.5572E-12 8.4685E-12 4.3418E-16 -2.2917E-14 4.8743E-13 1.2078E-10
# lat0 lon0 xBary yBary zBary JD0
3.300029 -172.266708 -0.024869 0.057416 -0.993571 2457111.857159
# Heliocentric elements and errors
Epoch: 2457110.5000 = 2015/03/29
Mean Anomaly: 245.69039 +/- 0.184
Argument of Peri: 213.89524 +/- 0.177
Long of Asc Node: 96.34082 +/- 0.015
Inclination: 3.23106 +/- 0.000
Eccentricity: 0.08180032 +/- 0.0005
Semi-Major Axis: 45.29084106 +/- 0.0067
Time of Perihelion: 2492460.8916 +/- 56.4
Perihelion: 41.58603584 +/- 0.0232
Aphelion: 48.99564628 +/- 0.0235
Period (y) 304.8062 +/- 0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -46.54910692 +/- 0.0016
Ecliptic Y -6.34618691 +/- 0.0002
Ecliptic Z 2.65130465 +/- 0.0001
Ecliptic XDOT 0.00050612 +/- 0.0000
Ecliptic YDOT -0.00240572 +/- 0.0000
Ecliptic ZDOT -0.00001340 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 47.05446695 +/- 0.0016
Geocenter to KBO 46.05776514 +/- 0.0016
# Hcoef: 8.03
The following table shows the complete astrometric record for 17DC170. 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 (17DC170) followed by the observatory code and reference code for the source of the astrometry.
2015 03 30.356381 12 33 36.95 -00 02 08.4 17DC170 T09 C~89UX 2015 03 30.369488 12 33 36.89 -00 02 08.0 17DC170 T09 C~89UX 2015 03 30.395233 12 33 36.80 -00 02 07.5 17DC170 T09 C~89UX 2016 04 04.44255 12 37 19.34 -00 26 06.3 26.1g 17DC170 T09 C~8COu 2016 04 04.46993 12 37 19.22 -00 26 05.6 25.7g 17DC170 T09 C~8COu 2016 04 04.47206 12 37 19.22 -00 26 05.5 25.6g 17DC170 T09 C~8COu 2016 04 04.51521 12 37 19.04 -00 26 04.5 25.6g 17DC170 T09 C~8COu 2016 04 05.452301 12 37 15.27 -00 25 40.6 17DC170 T09 C~89UX 2016 04 05.570256 12 37 14.79 -00 25 37.6 17DC170 T09 C~89UX 2017 02 21.48870 12 44 03.77 -01 10 21.0 24.0z 17DC170 T09 C~89UX 2017 02 21.51504 12 44 03.73 -01 10 20.5 24.6z 17DC170 T09 C~89UX 2017 02 21.53656 12 44 03.62 -01 10 20.4 24.3z 17DC170 T09 C~89UX 2017 02 21.55809 12 44 03.56 -01 10 19.7 24.1z 17DC170 T09 C~89UX 2017 02 21.56076 12 44 03.53 -01 10 19.7 24.0z 17DC170 T09 C~89UX 2017 02 21.58766 12 44 03.46 -01 10 18.8 23.5z 17DC170 T09 C~89UX 2017 02 21.60109 12 44 03.41 -01 10 18.7 24.2z 17DC170 T09 C~89UX 2017 02 21.60643 12 44 03.41 -01 10 18.7 24.0z 17DC170 T09 C~89UX 2017 02 23.53005 12 43 57.56 -01 09 35.7 24.6r 17DC170 T09 C~89UX 2017 02 23.56973 12 43 57.43 -01 09 34.5 25.1r 17DC170 T09 C~89UX 2017 02 23.60167 12 43 57.32 -01 09 34.1 24.7r 17DC170 T09 C~89UX 2017 02 23.60376 12 43 57.32 -01 09 34.0 25.1r 17DC170 T09 C~89UX 2017 02 23.64192 12 43 57.21 -01 09 33.3 25.3r 17DC170 T09 C~89UX 2017 04 27.380876 12 39 58.33 -00 43 46.4 17DC170 T09 C~89UX 2019 04 03.469560 12 49 49.08 -01 46 35.9 17DC170 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 0.01 0.00 0.03
2 0.0000 -0.98 -0.09 0.01 0.05
3 0.0001 -2.42 0.20 -0.06 -0.01
4 1.0160 3632.89 -0.10 -6.73 -0.08
5 1.0161 3630.96 -0.20 -6.80 -0.12
6 1.0161 3630.92 -0.09 -6.71 -0.03
7 1.0162 3628.05 -0.09 -6.85 -0.13
8 1.0187 3566.64 0.06 -7.17 0.03
9 1.0191 3558.83 0.11 -7.25 0.06
10 1.9004 10262.07 0.00 -57.27 0.20
11 1.9005 10261.32 ( 0.60) -57.05 ( 0.37)
12 1.9006 10259.76 0.13 -57.61 -0.24
13 1.9006 10258.65 0.13 -57.32 0.01
14 1.9006 10258.24 -0.15 -57.49 -0.18
15 1.9007 10256.92 -0.10 -57.08 0.18
16 1.9007 10256.19 -0.15 -57.28 -0.05
17 1.9008 10256.19 0.13 -57.28 -0.06
18 1.9060 10158.37 0.09 -52.29 0.06
19 1.9061 10156.10 -0.09 -51.95 0.32
20 1.9062 10154.42 -0.09 -52.24 -0.03
21 1.9062 10154.38 -0.02 -52.14 0.06
22 1.9063 10152.59 0.20 -52.15 -0.03
23 2.0781 6243.93 0.15 -41.38 0.04
24 4.0113 15901.01 -0.03 -19.49 -0.06
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.
17DC170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.875 44.894 44.855 ecceobj 0.088 0.087 0.088 incobj 3.230 3.230 3.230 qmin 40.557 40.599 40.500 qmax 49.970 49.971 50.017 amean 45.129 45.147 45.109 amin 44.757 44.781 44.741 amax 45.519 45.532 45.508 emean 0.084 0.084 0.084 emin 0.069 0.069 0.069 emax 0.098 0.098 0.099 imean 1.483 1.479 1.500 imin 1.009 1.000 0.997 imax 1.995 1.996 2.023 excite_mean 0.088 0.088 0.089 fracstop 1.000 1.000 1.000 cjmean 3.106 3.106 3.106 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 136.3 138.0 139.4 kozaiamp 180.0 180.0 180.0