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: 02PY170 # Created Sun Oct 19 01:08:39 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 17 observations of 17 # Arc: 23.13y # First observation: 2002/08/05 # Last observation: 2025/09/20 # Chi-squared of fit: 42.80 DOF: 28 RMS: 0.28 # Min/Max residuals: -0.54 0.90 # Exact a, adot, b, bdot, g, gdot: 1.573790E-05 2.274695E-02 -1.816609E-06 -9.432444E-04 2.377598E-02 8.907131E-04 # Covariance matrix: 3.1870E-13 -5.3360E-14 -3.5352E-15 2.0320E-15 2.8601E-13 -9.0623E-14 -5.3360E-14 2.6745E-14 1.4647E-15 -1.0960E-15 -3.1835E-14 4.8596E-14 -3.5352E-15 1.4647E-15 1.3117E-13 -7.4772E-15 -3.7768E-15 2.8218E-15 2.0320E-15 -1.0960E-15 -7.4772E-15 1.3469E-15 1.4869E-15 -2.0947E-15 2.8601E-13 -3.1835E-14 -3.7768E-15 1.4869E-15 5.3882E-13 -6.7075E-14 -9.0623E-14 4.8596E-14 2.8218E-15 -2.0947E-15 -6.7075E-14 9.2891E-14 # lat0 lon0 xBary yBary zBary JD0 -1.885753 -31.181208 0.283861 -0.032249 -0.977592 2452491.954163 # Heliocentric elements and errors Epoch: 2452492.5000 = 2002/08/06 Mean Anomaly: 95.40336 +/- 0.196 Argument of Peri: 118.71587 +/- 0.179 Long of Asc Node: 110.85881 +/- 0.001 Inclination: 3.01971 +/- 0.000 Eccentricity: 0.03089618 +/- 0.0000 Semi-Major Axis: 42.86977879 +/- 0.0054 Time of Perihelion: 2425322.6996 +/- 56.0 Perihelion: 41.54526655 +/- 0.0053 Aphelion: 44.19429103 +/- 0.0056 Period (y) 280.6953 +/- 0.05 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 36.65357755 +/- 0.0011 Ecliptic Y -22.50766804 +/- 0.0007 Ecliptic Z -1.38407885 +/- 0.0000 Ecliptic XDOT 0.00143303 +/- 0.0000 Ecliptic YDOT 0.00218714 +/- 0.0000 Ecliptic ZDOT -0.00011172 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.03479836 +/- 0.0010 Geocenter to KBO 42.05925643 +/- 0.0013 # Hcoef: 8.02
The following table shows the complete astrometric record for 02PY170. 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 (02PY170) followed by the observatory code and reference code for the source of the astrometry.
2002 08 05.45342 22 06 32.20 -13 39 07.9 23.5R 02PY170 568 Cp2010 2002 08 05.51719 22 06 31.93 -13 39 09.4 23.6R 02PY170 568 Cp2010 2002 08 05.57902 22 06 31.66 -13 39 11.0 23.7R 02PY170 568 Cp2010 2002 08 09.43904 22 06 14.87 -13 40 47.3 02PY170 568 Cp2010 2002 09 04.22708 22 04 19.18 -13 51 28.5 02PY170 309 Cp2010 2002 09 04.27107 22 04 19.00 -13 51 29.5 02PY170 309 Cp2010 2003 10 29.04600 22 06 30.99 -13 41 49.0 02PY170 309 Cp2010 2003 10 29.12327 22 06 30.88 -13 41 49.3 02PY170 309 Cp2010 2004 09 16.14969 22 13 35.14 -13 07 22.9 02PY170 675 Cp2010 2004 09 16.18371 22 13 34.99 -13 07 23.9 02PY170 675 Cp2010 2004 09 17.16011 22 13 31.05 -13 07 45.5 02PY170 675 Cp2010 2004 09 17.29230 22 13 30.49 -13 07 48.4 02PY170 675 Cp2010 2004 09 17.30167 22 13 30.49 -13 07 48.6 02PY170 675 Cp2010 2014 07 29.38138 23 06 25.26 -08 23 23.8 25.0R 02PY170 G37 C~16a9 2014 07 29.42936 23 06 25.10 -08 23 24.7 02PY170 G37 C~16a9 2025 09 20.334740 23 55 15.467 -03 36 12.80 24.4G 02PY170 G37 C~98J5 2025 09 20.374520 23 55 15.292 -03 36 13.98 02PY170 G37 C~98J5
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 0.19
2 0.0002 0.00 -0.07 0.00 0.26
3 0.0003 0.00 -0.06 0.00 0.19
4 0.0109 0.00 -0.26 0.00 0.16
5 0.0815 0.00 -0.23 0.00 -0.12
6 0.0816 0.00 0.02 0.00 -0.09
7 1.2309 0.00 -0.18 0.00 -0.54
8 1.2311 0.00 -0.22 0.00 -0.47
9 2.1155 0.00 0.04 0.00 0.34
10 2.1156 0.00 -0.09 0.00 0.09
11 2.1183 0.00 0.53 0.00 -0.07
12 2.1187 0.00 0.32 0.00 -0.08
13 2.1187 0.00 0.90 0.00 -0.08
14 11.9806 0.00 -0.26 0.00 0.12
15 11.9808 0.00 -0.32 0.00 0.30
16 23.1263 0.00 0.10 0.00 -0.06
17 23.1264 0.00 0.08 0.00 -0.12
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.
02PY170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.186 43.186 43.186 ecceobj 0.030 0.030 0.030 incobj 3.016 3.016 3.016 qmin 41.230 41.230 41.231 qmax 45.118 45.118 45.118 amean 43.087 43.087 43.087 amin 42.758 42.757 42.757 amax 43.419 43.421 43.425 emean 0.021 0.021 0.021 emin 0.002 0.002 0.002 emax 0.040 0.040 0.040 imean 1.741 1.741 1.741 imin 0.769 0.769 0.768 imax 2.516 2.516 2.517 excite_mean 0.039 0.039 0.039 fracstop 1.000 1.000 1.000 cjmean 3.089 3.089 3.089 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 180.3 180.4 180.4 kozaiamp 180.0 180.0 179.9