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: 08AP118 # Created Tue May 7 01:12:53 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 14 observations of 14 # Arc: 16.17y # First observation: 2008/01/06 # Last observation: 2024/03/08 # Chi-squared of fit: 5.71 DOF: 22 RMS: 0.11 # Min/Max residuals: -0.24 0.27 # Exact a, adot, b, bdot, g, gdot: 1.755195E-05 3.076757E-02 -1.007750E-06 -4.590144E-04 2.771830E-02 5.521844E-04 # Covariance matrix: 3.6642E-13 -6.6284E-14 -5.1315E-16 6.4301E-16 -4.8350E-14 -8.2083E-14 -6.6284E-14 6.3552E-14 6.8947E-16 -8.6020E-16 1.1107E-13 1.0667E-13 -5.1315E-16 6.8947E-16 3.3402E-13 -2.2647E-14 7.3658E-16 1.3022E-15 6.4301E-16 -8.6020E-16 -2.2647E-14 2.1650E-15 -8.5735E-16 -1.6372E-15 -4.8350E-14 1.1107E-13 7.3658E-16 -8.5735E-16 8.7921E-13 5.4235E-14 -8.2083E-14 1.0667E-13 1.3022E-15 -1.6372E-15 5.4235E-14 2.1367E-13 # lat0 lon0 xBary yBary zBary JD0 -0.366180 127.685746 0.377947 -0.005748 -0.912935 2454471.858124 # Heliocentric elements and errors Epoch: 2454472.5000 = 2008/01/07 Mean Anomaly: 2.03412 +/- 0.005 Argument of Peri: 199.71437 +/- 0.008 Long of Asc Node: 284.60446 +/- 0.004 Inclination: 0.93339 +/- 0.000 Eccentricity: 0.15158453 +/- 0.0001 Semi-Major Axis: 43.59003562 +/- 0.0070 Time of Perihelion: 2453878.5440 +/- 1.4 Perihelion: 36.98246060 +/- 0.0076 Aphelion: 50.19761065 +/- 0.0093 Period (y) 287.7988 +/- 0.07 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -22.31430280 +/- 0.0007 Ecliptic Y 29.49827090 +/- 0.0010 Ecliptic Z -0.23062301 +/- 0.0000 Ecliptic XDOT -0.00243179 +/- 0.0000 Ecliptic YDOT -0.00181552 +/- 0.0000 Ecliptic ZDOT -0.00004580 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 36.98822764 +/- 0.0009 Geocenter to KBO 36.07726450 +/- 0.0012 # Hcoef: 7.37
The following table shows the complete astrometric record for 08AP118. 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 (08AP118) followed by the observatory code and reference code for the source of the astrometry.
2008 01 06.35737 08 39 59.44 +17 59 39.2 22.9r 08AP118 568 Cz6782 2008 01 06.42375 08 39 59.10 +17 59 40.2 23.2r 08AP118 568 Cz6782 2008 01 06.45271 08 39 58.94 +17 59 40.8 23.5r 08AP118 568 Cz6782 2008 01 07.56555 08 39 53.22 +18 00 01.9 23.5r 08AP118 568 Cz6782 2016 01 11.28995 09 35 12.55 +13 46 01.9 23.3r 08AP118 W84 C~7xZn 2017 03 16.05566 09 36 36.93 +13 37 23.9 22.7z 08AP118 W84 C~7xZn 2023 03 21.25630 10 15 43.272 +10 01 27.24 22.8r 08AP118 568 C~7xZn 2023 03 21.45069 10 15 42.397 +10 01 32.20 22.9r 08AP118 568 C~7xZn 2023 04 22.05418 10 13 57.220 +10 11 46.29 23.0r 08AP118 304 C~7xZn 2023 04 22.12317 10 13 57.086 +10 11 46.82 22.9r 08AP118 304 C~7xZn 2023 05 16.01824 10 13 35.270 +10 14 12.50 22.9r 08AP118 304 C~7xZn 2023 05 18.05936 10 13 36.016 +10 14 10.30 23.0r 08AP118 304 C~7xZn 2024 03 07.21328 10 23 10.385 +09 17 42.18 23.0r 08AP118 304 C~7xZn 2024 03 08.24269 10 23 05.287 +09 18 11.56 23.0r 08AP118 304 C~7xZn
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 0.04 0.00 0.15
2 0.0002 0.00 0.10 0.00 -0.11
3 0.0003 0.00 -0.05 0.00 -0.06
4 0.0033 0.00 -0.05 0.00 0.08
5 8.0135 0.00 -0.00 0.00 -0.02
6 9.1901 0.00 -0.08 0.00 -0.11
7 15.2030 0.00 0.12 0.00 -0.07
8 15.2035 0.00 0.08 0.00 -0.02
9 15.2901 0.00 -0.24 0.00 0.27
10 15.2903 0.00 -0.04 0.00 -0.05
11 15.3557 0.00 0.02 0.00 -0.05
12 15.3613 0.00 0.17 0.00 -0.19
13 16.1666 0.00 0.11 0.00 0.07
14 16.1694 0.00 -0.12 0.00 0.08
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.
08AP118 quality flag:3 Type: 7:4EEE 7:4EEE 7:4EEE axisobj 43.857 43.857 43.857 ecceobj 0.156 0.156 0.156 incobj 0.927 0.927 0.927 qmin 36.367 36.367 36.368 qmax 51.683 51.681 51.683 amean 43.726 43.726 43.726 amin 43.265 43.257 43.251 amax 44.259 44.259 44.259 emean 0.154 0.154 0.154 emin 0.139 0.139 0.139 emax 0.168 0.168 0.168 imean 3.302 3.297 3.318 imin 1.857 1.873 1.857 imax 4.183 4.181 4.206 excite_mean 0.165 0.165 0.165 fracstop 1.000 1.000 1.000 cjmean 3.065 3.065 3.065 libcent 0 176.5 176.5 178.4 libamp 0 148.7 148.7 150.7 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 180.5 180.9 181.0 kozaiamp 180.0 180.0 180.0