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: 17DO162
# Created Fri Apr 4 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 22 observations of 22
# Arc: 0.90y
# First observation: 2016/04/02
# Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000044 0.023449 -0.000001 0.001882 0.023595 0.000000
# Chi-squared of fit: 7.60 DOF: 38 RMS: 0.10
# Min/Max residuals: -0.23 0.24
# Exact a, adot, b, bdot, g, gdot:
1.432279E-05 2.331426E-02 1.222213E-06 1.900161E-03 2.403289E-02 -2.085038E-03
# Covariance matrix:
2.5206E-13 3.8361E-12 1.1220E-16 2.0339E-13 1.6889E-12 1.4554E-10
3.8361E-12 4.1643E-10 -7.9262E-14 1.9616E-11 1.4991E-10 1.4237E-08
1.1220E-16 -7.9262E-14 1.7981E-13 -2.2405E-13 -2.2426E-14 -2.5311E-12
2.0339E-13 1.9616E-11 -2.2405E-13 1.3633E-12 7.1528E-12 6.7378E-10
1.6889E-12 1.4991E-10 -2.2426E-14 7.1528E-12 5.5598E-11 5.1769E-09
1.4554E-10 1.4237E-08 -2.5311E-12 6.7378E-10 5.1769E-09 4.8858E-07
# lat0 lon0 xBary yBary zBary JD0
2.925143 -175.076051 -0.136280 0.050468 -0.984956 2457480.904541
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 297.60457 +/- 3.262
Argument of Peri: 103.97889 +/- 6.188
Long of Asc Node: 153.49905 +/- 0.010
Inclination: 5.43928 +/- 0.002
Eccentricity: 0.09235380 +/- 0.0290
Semi-Major Axis: 44.17482871 +/- 0.2242
Time of Perihelion: 2476067.5726 +/- 961.2
Perihelion: 40.09511525 +/- 1.2969
Aphelion: 48.25454216 +/- 1.3040
Period (y) 293.6098 +/- 2.23
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.37669112 +/- 0.0128
Ecliptic Y -3.78991194 +/- 0.0011
Ecliptic Z 2.12346479 +/- 0.0007
Ecliptic XDOT 0.00047543 +/- 0.0001
Ecliptic YDOT -0.00263185 +/- 0.0000
Ecliptic ZDOT 0.00020407 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.59878503 +/- 0.0128
Geocenter to KBO 41.60963892 +/- 0.0129
# Hcoef: 8.48
The following table shows the complete astrometric record for 17DO162. 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 (17DO162) followed by the observatory code and reference code for the source of the astrometry.
2016 04 02.403752 12 22 42.96 +00 43 44.2 17DO162 T09 C~83F2 2016 04 02.525980 12 22 42.41 +00 43 47.7 17DO162 T09 C~83F2 2016 04 04.35736 12 22 34.45 +00 44 40.4 25.6g 17DO162 T09 C~89UX 2016 04 04.36800 12 22 34.40 +00 44 40.7 25.4g 17DO162 T09 C~89UX 2016 04 04.39588 12 22 34.27 +00 44 41.4 25.6g 17DO162 T09 C~89UX 2016 04 04.41508 12 22 34.20 +00 44 41.9 25.3g 17DO162 T09 C~89UX 2016 04 04.41948 12 22 34.17 +00 44 42.1 25.1g 17DO162 T09 C~89UX 2016 06 05.330622 12 19 27.70 +01 03 07.2 17DO162 T09 C~83F2 2016 06 05.356114 12 19 27.67 +01 03 07.3 17DO162 T09 C~83F2 2017 01 23.62432 12 31 45.11 -00 11 26.6 24.4i 17DO162 T09 C~7zpm 2017 01 23.63041 12 31 45.10 -00 11 26.1 24.6i 17DO162 T09 C~7zpm 2017 01 23.63574 12 31 45.09 -00 11 25.9 24.8i 17DO162 T09 C~7zpm 2017 01 23.64653 12 31 45.07 -00 11 25.9 24.4i 17DO162 T09 C~7zpm 2017 01 23.65191 12 31 45.06 -00 11 25.9 24.7i 17DO162 T09 C~7zpm 2017 01 28.60076 12 31 37.34 -00 10 09.5 24.2z 17DO162 T09 C~7zpm 2017 01 28.60612 12 31 37.34 -00 10 09.5 24.3z 17DO162 T09 C~7zpm 2017 01 28.61691 12 31 37.30 -00 10 09.3 24.0z 17DO162 T09 C~7zpm 2017 01 28.62228 12 31 37.29 -00 10 09.1 24.3z 17DO162 T09 C~7zpm 2017 01 28.64799 12 31 37.25 -00 10 08.8 24.3z 17DO162 T09 C~7zpm 2017 02 23.53583 12 30 27.16 -00 00 37.7 25.0r 17DO162 T09 C~7zpm 2017 02 23.57406 12 30 27.01 -00 00 36.5 25.2r 17DO162 T09 C~7zpm 2017 02 23.64828 12 30 26.74 -00 00 34.5 24.9r 17DO162 T09 C~7zpm
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 0.21 0.00 0.01
2 0.0003 -8.96 0.12 -0.06 -0.06
3 0.0053 -139.46 -0.06 1.01 0.08
4 0.0054 -140.27 -0.10 0.99 0.06
5 0.0055 -142.34 -0.15 0.86 -0.07
6 0.0055 -143.50 0.07 0.90 -0.02
7 0.0055 -143.99 -0.11 0.91 -0.02
8 0.1750 -3149.90 0.04 -92.63 0.01
9 0.1751 -3150.36 -0.01 -92.72 0.00
10 0.8110 8783.57 0.17 184.81 -0.23
11 0.8110 8783.23 -0.01 185.21 0.14
12 0.8110 8783.01 -0.10 185.33 0.24
13 0.8111 8782.74 -0.10 185.21 0.08
14 0.8111 8782.60 -0.10 185.15 -0.01
15 0.8246 8645.76 0.06 209.39 0.01
16 0.8246 8645.76 0.23 209.39 -0.01
17 0.8247 8645.13 -0.05 209.34 -0.11
18 0.8247 8644.91 -0.10 209.46 -0.01
19 0.8248 8644.24 0.06 209.50 -0.08
20 0.8956 7450.80 0.16 316.95 -0.08
21 0.8957 7448.26 -0.08 317.16 0.02
22 0.8959 7443.74 -0.13 317.39 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.
17DO162 quality flag:2 Type: CLASSICAL SCATNEAR CLASSICAL axisobj 43.697 44.419 43.527 ecceobj 0.088 0.168 0.042 incobj 5.461 5.459 5.463 qmin 39.461 34.284 41.232 qmax 48.659 55.520 46.504 amean 43.931 44.554 43.751 amin 43.581 44.047 43.393 amax 44.304 45.158 44.100 emean 0.083 0.207 0.037 emin 0.067 0.156 0.020 emax 0.099 0.230 0.055 imean 5.045 6.305 5.003 imin 4.368 4.267 4.401 imax 5.768 8.465 5.684 excite_mean 0.121 0.235 0.095 fracstop 1.000 1.000 1.000 cjmean 3.083 3.041 3.088 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 178.4 178.3 178.0 kozaiamp 180.0 180.0 180.0