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: 08NW4
# Created Thu May 24 01:37:49 2012
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 17
# Arc: 1.05y
# First observation: 2008/07/07
# Last observation: 2009/07/27
Preliminary a, adot, b, bdot, g, gdot:
-0.000077 0.029009 -0.000002 0.011467 0.027558 0.000000
# Chi-squared of fit: 27.80 DOF: 28 RMS: 0.23
# Min/Max residuals: -0.52 0.51
# Exact a, adot, b, bdot, g, gdot:
1.543505E-05 2.905894E-02 4.078535E-06 1.148208E-02 2.779764E-02 -1.876974E-03
# Covariance matrix:
2.5499E-13 6.7919E-13 -2.0028E-14 3.9297E-13 6.5020E-13 3.3344E-11
6.7919E-13 1.3268E-11 -2.7082E-13 5.4604E-12 5.7579E-12 4.7180E-10
-2.0028E-14 -2.7082E-13 1.3141E-13 -2.6483E-13 -1.3148E-13 -1.0136E-11
3.9297E-13 5.4604E-12 -2.6483E-13 2.9188E-12 2.6115E-12 2.0398E-10
6.5020E-13 5.7579E-12 -1.3148E-13 2.6115E-12 3.6132E-12 2.2342E-10
3.3344E-11 4.7180E-10 -1.0136E-11 2.0398E-10 2.2342E-10 1.7604E-08
# lat0 lon0 xBary yBary zBary JD0
8.648772 -54.049226 0.354289 0.142507 -0.936917 2454654.807714
# Heliocentric elements and errors
Epoch: 2454650.5000 = 2008/07/03
Mean Anomaly: 344.13523 +/- 0.837
Argument of Peri: 46.03834 +/- 1.325
Long of Asc Node: 285.07696 +/- 0.001
Inclination: 23.10680 +/- 0.001
Eccentricity: 0.20154264 +/- 0.0019
Semi-Major Axis: 45.55958448 +/- 0.0330
Time of Perihelion: 2459600.4342 +/- 261.2
Perihelion: 36.37738563 +/- 0.0899
Aphelion: 54.74178333 +/- 0.0947
Period (y) 307.5232 +/- 0.33
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 21.15104132 +/- 0.0014
Ecliptic Y -29.77053583 +/- 0.0020
Ecliptic Z 5.40990212 +/- 0.0004
Ecliptic XDOT 0.00211607 +/- 0.0000
Ecliptic YDOT 0.00196717 +/- 0.0000
Ecliptic ZDOT 0.00109012 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 36.91772465 +/- 0.0018
Geocenter to KBO 35.97428129 +/- 0.0025
# Hcoef: 5.83
The following table shows the complete astrometric record for 08NW4. 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 (08NW4) followed by the observatory code and reference code for the source of the astrometry.
2008 07 07.30696 20 24 39.27 -10 23 30.7 21.0R 08NW4 675 Cz5252 2008 07 07.34981 20 24 39.04 -10 23 31.4 21.4R 08NW4 675 Cz5252 2008 07 08.33032 20 24 34.02 -10 23 38.0 21.2R 08NW4 675 Cz5252 2008 07 08.37197 20 24 33.83 -10 23 38.0 20.8R 08NW4 675 Cz5252 2008 07 09.32507 20 24 28.94 -10 23 45.2 08NW4 675 Cz5252 2008 07 23.24423 20 23 14.89 -10 25 55.7 08NW4 675 Cz5252 2008 07 23.29817 20 23 14.58 -10 25 56.1 08NW4 675 Cz5252 2008 07 23.35265 20 23 14.30 -10 25 56.8 08NW4 675 Cz5252 2008 08 07.18486 20 21 54.22 -10 29 13.7 08NW4 675 Cz5252 2008 08 07.24629 20 21 53.93 -10 29 14.1 08NW4 675 Cz5252 2008 08 07.29484 20 21 53.63 -10 29 15.0 08NW4 675 Cz5252 2008 08 23.00034 20 20 34.61 -10 33 21.9 08NW4 807 Cz5252 2008 08 23.07282 20 20 34.26 -10 33 23.1 08NW4 807 Cz5252 2009 05 27.43321 20 33 11.57 -09 23 01.8 08NW4 675 C~0Aba 2009 05 29.42481 20 33 07.09 -09 22 38.7 08NW4 675 C~0Aba 2009 07 27.20913 20 28 52.55 -09 24 14.2 21.3R 08NW4 688 C~0Aba 2009 07 27.26532 20 28 52.24 -09 24 15.1 08NW4 688 C~0Aba
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 0.23 0.00 0.51 2 0.0001 -3.46 0.01 0.13 0.13 3 0.0028 -76.98 -0.21 11.30 0.07 4 0.0029 -79.70 0.24 11.96 0.25 5 0.0055 -151.49 0.20 22.09 -0.31 6 0.0436 -1243.79 -0.11 154.02 -0.17 7 0.0438 -1248.33 -0.25 154.71 0.09 8 0.0439 -1252.51 0.02 155.01 -0.05 9 0.0845 -2446.96 -0.52 242.24 -0.41 10 0.0847 -2451.22 0.18 242.86 -0.05 11 0.0848 -2455.73 -0.42 243.02 -0.09 12 0.1278 -3646.76 0.34 276.66 -0.04 13 0.1280 -3652.06 0.29 276.70 -0.02 14 0.8874 8225.49 0.07 1701.95 0.31 15 0.8929 8166.72 -0.03 1740.53 -0.13 16 1.0538 4485.05 0.01 2559.53 0.04 17 1.0540 4480.38 -0.05 2559.76 -0.13
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.
08NW4 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 45.281 45.374 45.204 ecceobj 0.199 0.204 0.194 incobj 23.180 23.179 23.181 qmin 35.802 35.703 35.914 qmax 54.884 55.129 54.588 amean 45.304 45.379 45.218 amin 45.229 45.331 45.163 amax 45.380 45.438 45.280 emean 0.199 0.202 0.194 emin 0.187 0.190 0.182 emax 0.210 0.214 0.206 imean 24.697 24.747 24.691 imin 24.225 24.284 24.221 imax 25.043 25.137 25.089 excite_mean 0.463 0.465 0.461 fracstop 1.000 1.000 1.000 cjmean 2.848 2.846 2.849 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 183.1 185.9 182.9 kozaiamp 179.9 180.0 180.0