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: 17DE170
# Created Tue Apr 1 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 15 observations of 15
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
0.000049 0.030609 -0.000018 -0.007100 0.025773 0.000000
# Chi-squared of fit: 7.38 DOF: 24 RMS: 0.12
# Min/Max residuals: -0.34 0.21
# Exact a, adot, b, bdot, g, gdot:
1.897616E-05 3.096572E-02 -4.031635E-06 -7.184629E-03 2.592507E-02 4.531260E-03
# Covariance matrix:
7.1605E-13 -9.1377E-13 -8.1962E-14 1.5873E-13 -2.8727E-13 -7.2972E-12
-9.1377E-13 2.5599E-12 2.7022E-13 -5.5031E-13 -4.2045E-13 2.5332E-11
-8.1962E-14 2.7022E-13 3.3808E-13 -2.8993E-13 -4.5857E-14 2.9564E-12
1.5873E-13 -5.5031E-13 -2.8993E-13 3.7689E-13 1.0985E-13 -6.0301E-12
-2.8727E-13 -4.2045E-13 -4.5857E-14 1.0985E-13 9.0583E-13 -5.0763E-12
-7.2972E-12 2.5332E-11 2.9564E-12 -6.0301E-12 -5.0763E-12 2.7759E-10
# lat0 lon0 xBary yBary zBary JD0
4.602642 -172.683893 -0.130752 0.079374 -0.984373 2457482.992212
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 5.63757 +/- 0.017
Argument of Peri: 137.43607 +/- 0.069
Long of Asc Node: 26.17161 +/- 0.001
Inclination: 13.77979 +/- 0.001
Eccentricity: 0.55690063 +/- 0.0005
Semi-Major Axis: 86.65924081 +/- 0.0888
Time of Perihelion: 2452866.1516 +/- 12.1
Perihelion: 38.39865479 +/- 0.0601
Aphelion: 134.91982682 +/- 0.1455
Period (y) 806.7343 +/- 1.24
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.10186427 +/- 0.0014
Ecliptic Y -5.15437697 +/- 0.0002
Ecliptic Z 3.09514283 +/- 0.0001
Ecliptic XDOT -0.00011693 +/- 0.0000
Ecliptic YDOT -0.00331903 +/- 0.0000
Ecliptic ZDOT -0.00071789 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 39.56138649 +/- 0.0014
Geocenter to KBO 38.57270775 +/- 0.0014
# Hcoef: 8.22
The following table shows the complete astrometric record for 17DE170. 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 (17DE170) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.491423 12 34 08.46 +01 19 31.8 17DE170 T09 C~89UX 2016 04 04.525888 12 34 08.30 +01 19 32.7 17DE170 T09 C~89UX 2017 02 21.49546 12 43 00.75 -00 02 34.7 24.2z 17DE170 T09 C~89UX 2017 02 21.52038 12 43 00.67 -00 02 34.2 23.4z 17DE170 T09 C~89UX 2017 02 21.53656 12 43 00.60 -00 02 33.7 23.2z 17DE170 T09 C~89UX 2017 02 21.54193 12 43 00.59 -00 02 33.7 23.5z 17DE170 T09 C~89UX 2017 02 21.56614 12 43 00.50 -00 02 33.4 23.6z 17DE170 T09 C~89UX 2017 02 21.59574 12 43 00.41 -00 02 32.7 24.3z 17DE170 T09 C~89UX 2017 02 21.60643 12 43 00.37 -00 02 32.4 24.3z 17DE170 T09 C~89UX 2017 02 23.57824 12 42 53.52 -00 01 49.1 24.4r 17DE170 T09 C~89UX 2017 02 23.61219 12 42 53.38 -00 01 48.0 24.8r 17DE170 T09 C~89UX 2017 02 23.64192 12 42 53.29 -00 01 47.4 24.5r 17DE170 T09 C~89UX 2017 02 23.65456 12 42 53.25 -00 01 46.9 24.8r 17DE170 T09 C~89UX 2017 04 27.392208 12 38 19.81 +00 23 17.9 17DE170 T09 C~89UX 2019 04 06.460461 12 51 26.50 -01 51 31.4 17DE170 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 -0.02 0.00 -0.07
2 0.0001 -2.56 0.00 -0.12 -0.01
3 0.8843 9286.68 -0.10 -1374.15 0.14
4 0.8844 9285.38 0.01 -1374.17 0.14
5 0.8844 9284.21 -0.23 -1374.12 0.19
6 0.8845 9284.08 -0.06 -1374.18 0.14
7 0.8845 9282.71 -0.05 -1374.44 -0.11
8 0.8846 9281.19 0.12 -1374.33 0.02
9 0.8846 9280.52 0.06 -1374.29 0.07
10 0.8900 9168.80 0.21 -1375.09 -0.34
11 0.8901 9166.43 -0.16 -1374.90 -0.14
12 0.8902 9164.95 0.11 -1374.89 -0.10
13 0.8902 9164.20 0.10 -1374.66 0.14
14 1.0620 4796.52 0.01 -1611.88 -0.03
15 3.0033 18884.79 -0.01 -4398.40 -0.03
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.
17DE170 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 84.610 84.895 84.327 ecceobj 0.546 0.548 0.545 incobj 13.826 13.826 13.826 qmin 37.415 37.209 37.397 qmax 135.813 136.322 135.714 amean 85.080 85.328 85.086 amin 83.655 83.875 83.705 amax 87.060 87.263 87.096 emean 0.548 0.551 0.548 emin 0.536 0.536 0.538 emax 0.560 0.563 0.560 imean 13.696 13.483 13.618 imin 13.192 12.786 13.107 imax 14.244 14.346 13.937 excite_mean 0.597 0.598 0.597 fracstop 1.000 1.000 1.000 cjmean 3.086 3.086 3.087 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 205.9 176.1 206.5 kozaiamp 180.0 180.0 180.0