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: 17BL235
# Created Mon Apr 28 01:11:03 2025
# Orbit generated from Bernstein formalism
# Fitting 26 observations of 26
# Arc: 0.90y
# First observation: 2016/04/02
# Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000046 0.023671 -0.000000 0.000441 0.023892 0.000000
# Chi-squared of fit: 10.33 DOF: 46 RMS: 0.11
# Min/Max residuals: -0.29 0.23
# Exact a, adot, b, bdot, g, gdot:
1.496361E-05 2.367083E-02 4.313404E-07 4.469887E-04 2.428000E-02 9.966633E-04
# Covariance matrix:
2.8267E-13 3.1916E-12 9.4661E-15 1.9521E-14 1.4557E-12 1.2324E-10
3.1916E-12 3.2637E-10 6.4935E-13 1.6482E-12 1.1207E-10 1.0948E-08
9.4661E-15 6.4935E-13 1.5431E-13 -1.8907E-13 2.3167E-13 2.2084E-11
1.9521E-14 1.6482E-12 -1.8907E-13 3.9615E-13 5.7410E-13 5.5599E-11
1.4557E-12 1.1207E-10 2.3167E-13 5.7410E-13 3.9434E-11 3.7936E-09
1.2324E-10 1.0948E-08 2.2084E-11 5.5599E-11 3.7936E-09 3.6866E-07
# lat0 lon0 xBary yBary zBary JD0
2.391973 -174.250121 -0.121870 0.041380 -0.987262 2457480.894196
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 60.43369 +/- 8.884
Argument of Peri: 359.68246 +/- 11.587
Long of Asc Node: 120.62582 +/- 0.036
Inclination: 2.57084 +/- 0.001
Eccentricity: 0.05058842 +/- 0.0240
Semi-Major Axis: 43.16840108 +/- 0.1209
Time of Perihelion: 2440089.5228 +/- 2555.5
Perihelion: 40.98457993 +/- 1.0443
Aphelion: 45.35222223 +/- 1.0457
Period (y) 283.6333 +/- 1.19
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.91788704 +/- 0.0106
Ecliptic Y -4.34559144 +/- 0.0011
Ecliptic Z 1.71897315 +/- 0.0004
Ecliptic XDOT 0.00015789 +/- 0.0001
Ecliptic YDOT -0.00267375 +/- 0.0000
Ecliptic ZDOT 0.00005506 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.17758039 +/- 0.0105
Geocenter to KBO 41.18615618 +/- 0.0107
# Hcoef: 8.46
The following table shows the complete astrometric record for 17BL235. 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 (17BL235) followed by the observatory code and reference code for the source of the astrometry.
2016 04 02.393407 12 24 54.10 -00 05 14.6 17BL235 T09 C~83Eq 2016 04 02.525980 12 24 53.51 -00 05 10.9 17BL235 T09 C~83Eq 2016 04 04.34883 12 24 45.45 -00 04 18.9 26.3g 17BL235 T09 C~89UT 2016 04 04.37012 12 24 45.35 -00 04 18.5 25.9g 17BL235 T09 C~89UT 2016 04 04.38940 12 24 45.28 -00 04 17.9 25.5g 17BL235 T09 C~89UT 2016 04 04.41508 12 24 45.15 -00 04 17.2 25.2g 17BL235 T09 C~89UT 2016 06 04.25539 12 21 34.99 +00 14 11.9 24.0z 17BL235 T09 C~8COq 2016 06 04.27307 12 21 34.97 +00 14 11.9 24.5z 17BL235 T09 C~8COq 2016 06 04.28926 12 21 34.96 +00 14 12.0 24.4z 17BL235 T09 C~8COq 2016 06 04.34327 12 21 34.87 +00 14 12.4 23.9z 17BL235 T09 C~8COq 2016 06 05.311488 12 21 33.83 +00 14 15.9 17BL235 T09 C~83Eq 2016 06 05.358251 12 21 33.78 +00 14 16.1 17BL235 T09 C~83Eq 2017 01 28.62228 12 33 45.68 -01 02 50.2 24.2z 17BL235 T09 C~7zpg 2017 01 28.64259 12 33 45.65 -01 02 49.9 24.1z 17BL235 T09 C~7zpg 2017 01 28.64528 12 33 45.64 -01 02 50.1 24.4z 17BL235 T09 C~7zpg 2017 01 28.64799 12 33 45.64 -01 02 49.9 24.6z 17BL235 T09 C~7zpg 2017 01 28.65069 12 33 45.63 -01 02 49.7 24.2z 17BL235 T09 C~7zpg 2017 01 28.65605 12 33 45.64 -01 02 49.7 24.6z 17BL235 T09 C~7zpg 2017 02 02.60942 12 33 35.92 -01 01 29.8 24.6i 17BL235 T09 C~7zpg 2017 02 02.61925 12 33 35.89 -01 01 29.8 24.5i 17BL235 T09 C~7zpg 2017 02 02.62764 12 33 35.87 -01 01 29.5 24.3i 17BL235 T09 C~7zpg 2017 02 02.63614 12 33 35.86 -01 01 29.3 24.3i 17BL235 T09 C~7zpg 2017 02 23.56555 12 32 35.35 -00 53 58.1 24.6r 17BL235 T09 C~7zpg 2017 02 23.59748 12 32 35.25 -00 53 57.1 24.9r 17BL235 T09 C~7zpg 2017 02 23.60801 12 32 35.19 -00 53 56.7 25.2r 17BL235 T09 C~7zpg 2017 02 23.63774 12 32 35.08 -00 53 56.1 24.9r 17BL235 T09 C~7zpg
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 -0.03
2 0.0004 -9.59 0.23 -0.10 -0.05
3 0.0054 -141.20 -0.16 -0.20 0.14
4 0.0054 -142.74 -0.14 -0.43 -0.07
5 0.0055 -143.94 0.06 -0.29 0.08
6 0.0055 -146.01 -0.13 -0.42 -0.03
7 0.1721 -3204.71 -0.06 -110.79 0.01
8 0.1722 -3204.98 -0.01 -110.91 -0.05
9 0.1722 -3205.16 0.11 -110.88 0.04
10 0.1723 -3206.56 -0.29 -111.04 0.05
11 0.1750 -3222.27 0.13 -114.00 -0.06
12 0.1751 -3223.04 0.16 -114.12 -0.02
13 0.8247 8694.97 -0.08 -19.04 0.00
14 0.8248 8694.43 0.02 -18.94 0.04
15 0.8248 8694.37 0.05 -19.18 -0.21
16 0.8248 8694.29 0.05 -19.00 -0.03
17 0.8248 8694.08 -0.08 -18.87 0.08
18 0.8248 8694.22 0.23 -18.81 0.13
19 0.8384 8528.44 0.01 -3.06 0.03
20 0.8384 8528.02 -0.03 -3.23 -0.17
21 0.8384 8527.63 -0.11 -3.08 -0.04
22 0.8384 8527.41 -0.01 -2.95 0.07
23 0.8957 7513.90 0.05 52.60 -0.14
24 0.8958 7512.13 0.19 52.93 0.13
25 0.8959 7511.14 -0.16 52.94 0.12
26 0.8959 7509.39 -0.14 52.84 -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.
17BL235 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.735 43.406 42.469 ecceobj 0.048 0.116 0.017 incobj 2.573 2.574 2.572 qmin 39.371 36.572 41.333 qmax 46.692 51.131 44.129 amean 42.931 43.617 42.674 amin 42.594 43.234 42.349 amax 43.281 44.054 42.995 emean 0.058 0.122 0.014 emin 0.038 0.091 0.001 emax 0.080 0.161 0.027 imean 1.874 1.875 1.918 imin 0.739 0.408 0.758 imax 2.865 3.163 2.866 excite_mean 0.067 0.127 0.038 fracstop 1.000 1.000 1.000 cjmean 3.083 3.077 3.084 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 182.6 181.0 176.7 kozaiamp 180.0 180.0 179.9