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: 09JW18 # Created Wed Nov 27 02:08:58 2024 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 10.91d # First observation: 2009/05/14 # Last observation: 2009/05/25 Preliminary a, adot, b, bdot, g, gdot: 0.000000 0.022682 -0.000001 -0.003164 0.023002 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 1.10 DOF: 15 RMS: 0.06 # Min/Max residuals: -0.10 0.10 # Exact a, adot, b, bdot, g, gdot: 1.538301E-05 2.164499E-02 -3.016959E-06 -3.618186E-03 2.272932E-02 -1.000880E-03 # Covariance matrix: 1.5415E-12 1.2391E-09 2.9946E-13 5.0305E-10 3.8962E-10 -5.5907E-09 1.2391E-09 1.3588E-06 3.2008E-10 5.4550E-07 4.2034E-07 -9.1927E-06 2.9946E-13 3.2008E-10 4.5238E-13 1.1271E-10 9.9718E-11 -7.0837E-10 5.0305E-10 5.4550E-07 1.1271E-10 2.2032E-07 1.6871E-07 -4.0654E-06 3.8962E-10 4.2034E-07 9.9718E-11 1.6871E-07 1.3034E-07 -2.3563E-06 -5.5907E-09 -9.1927E-06 -7.0837E-10 -4.0654E-06 -2.3563E-06 1.1954E-03 # lat0 lon0 xBary yBary zBary JD0 13.984421 178.835747 -0.821034 0.141772 -0.569377 2454965.851269 # Heliocentric elements and errors Epoch: 2454960.5000 = 2009/05/09 Mean Anomaly: 332.55604 +/- 92.474 Argument of Peri: 155.31899 +/- 266.781 Long of Asc Node: 54.17896 +/- 4.858 Inclination: 16.83903 +/- 0.970 Eccentricity: 0.05889571 +/- 0.9137 Semi-Major Axis: 46.98939545 +/- 8.5292 Time of Perihelion: 2463929.4675 +/- 383168.7 Perihelion: 44.22192174 +/- 43.6800 Aphelion: 49.75686916 +/- 43.8758 Period (y) 322.1128 +/- 87.70 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -43.28379873 +/- 0.6780 Ecliptic Y 0.05377103 +/- 0.0138 Ecliptic Z 10.63190949 +/- 0.1689 Ecliptic XDOT -0.00003634 +/- 0.0040 Ecliptic YDOT -0.00260292 +/- 0.0001 Ecliptic ZDOT -0.00045215 +/- 0.0010 # Distances at JD0 (AU) Heliocenter to KBO 44.57047928 +/- 0.6596 Geocenter to KBO 43.99604495 +/- 0.6988 # Hcoef: 8.50
The following table shows the complete astrometric record for 09JW18. 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 (09JW18) followed by the observatory code and reference code for the source of the astrometry.
2009 05 14.350503 12 18 23.708 +13 16 16.14 24.6i 09JW18 568 C~0aRU 2009 05 14.395005 12 18 23.588 +13 16 15.89 09JW18 568 C~0aRU 2009 05 15.253695 12 18 21.341 +13 16 14.03 25.3g 09JW18 568 C~0aRU 2009 05 15.326414 12 18 21.139 +13 16 13.78 24.5i 09JW18 568 C~0aRU 2009 05 22.258545 12 18 04.754 +13 15 41.50 25.2g 09JW18 568 C~0aRU 2009 05 22.315214 12 18 04.640 +13 15 41.11 26.0g 09JW18 568 C~0aRU 2009 05 22.371056 12 18 04.511 +13 15 40.60 25.3g 09JW18 568 C~0aRU 2009 05 24.280205 12 18 00.616 +13 15 26.38 26.0g 09JW18 568 C~0aRU 2009 05 24.337723 12 18 00.504 +13 15 25.80 25.6g 09JW18 568 C~0aRU 2009 05 25.263711 12 17 58.713 +13 15 17.96 09JW18 568 C~0aRU
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 -0.07 0.00 0.10
2 0.0001 -1.50 0.02 -0.94 -0.03
3 0.0025 -30.68 0.06 -16.05 0.00
4 0.0027 -33.27 -0.00 -17.48 -0.10
5 0.0217 -238.44 -0.09 -144.65 0.02
6 0.0218 -239.80 0.05 -145.69 0.09
7 0.0220 -241.31 0.01 -146.92 -0.06
8 0.0272 -287.41 -0.06 -183.12 0.05
9 0.0273 -288.67 0.06 -184.32 -0.01
10 0.0299 -309.34 0.00 -202.15 -0.07
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.
09JW18 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0