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: 15DT249 # Created Wed Nov 27 02:10:13 2024 # Orbit generated from Bernstein formalism # Fitting 13 observations of 13 # Arc: 5.04d # First observation: 2015/02/17 # Last observation: 2015/02/22 Preliminary a, adot, b, bdot, g, gdot: -0.000001 0.032137 0.000001 0.007193 0.026901 0.000000 # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # WARNING Fitting with energy constraint # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # Chi-squared of fit: 11.34 DOF: 21 RMS: 0.17 # Min/Max residuals: -0.33 0.51 # Exact a, adot, b, bdot, g, gdot: 1.477059E-05 2.501762E-02 4.962302E-06 7.454165E-03 2.578122E-02 6.342675E-03 # Covariance matrix: 5.3580E-11 8.6388E-08 9.9227E-13 -3.1523E-09 1.3631E-08 -1.4259E-07 8.6388E-08 1.4004E-04 1.6087E-09 -5.1089E-06 2.2089E-05 -2.3413E-04 9.9227E-13 1.6087E-09 2.6890E-13 -8.3093E-11 2.5372E-10 -2.7884E-09 -3.1523E-09 -5.1089E-06 -8.3093E-11 1.9072E-07 -8.0585E-07 8.5908E-06 1.3631E-08 2.2089E-05 2.5372E-10 -8.0585E-07 3.4843E-06 -3.6787E-05 -1.4259E-07 -2.3413E-04 -2.7884E-09 8.5908E-06 -3.6787E-05 8.3870E-04 # lat0 lon0 xBary yBary zBary JD0 -20.826282 144.251581 -0.063113 -0.349390 -0.919029 2457070.705188 # Heliocentric elements and errors Epoch: 2457070.5000 = 2015/02/17 Mean Anomaly: 54.21886 +/- 76.681 Argument of Peri: 225.04165 +/- 159.159 Long of Asc Node: 193.93263 +/- 14.335 Inclination: 25.93857 +/- 4.843 Eccentricity: 0.25727017 +/- 1.0405 Semi-Major Axis: 43.97186843 +/- 22.1834 Time of Perihelion: 2441030.3408 +/- 19164.7 Perihelion: 32.65921837 +/- 48.6286 Aphelion: 55.28451849 +/- 53.5831 Period (y) 291.5886 +/- 220.66 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -30.26132546 +/- 2.1302 Ecliptic Y 21.70372493 +/- 1.5337 Ecliptic Z -13.79035810 +/- 0.9985 Ecliptic XDOT -0.00229516 +/- 0.0020 Ecliptic YDOT -0.00162954 +/- 0.0024 Ecliptic ZDOT 0.00050049 +/- 0.0010 # Distances at JD0 (AU) Heliocenter to KBO 39.71112528 +/- 1.8595 Geocenter to KBO 38.78792548 +/- 2.8083 # Hcoef: 7.38
The following table shows the complete astrometric record for 15DT249. 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 (15DT249) followed by the observatory code and reference code for the source of the astrometry.
2015 02 17.20441 09 18 57.37 -06 15 25.4 23.5g 15DT249 W84 C~2iOW 2015 02 17.27305 09 18 57.03 -06 15 23.0 23.8g 15DT249 W84 C~2iOW 2015 02 18.04806 09 18 53.30 -06 14 58.9 23.9g 15DT249 W84 C~2iOW 2015 02 18.18349 09 18 52.64 -06 14 54.6 23.5g 15DT249 W84 C~2iOW 2015 02 18.25189 09 18 52.30 -06 14 52.6 23.8g 15DT249 W84 C~2iOW 2015 02 18.32238 09 18 51.97 -06 14 50.3 23.7g 15DT249 W84 C~2iOW 2015 02 19.04472 09 18 48.51 -06 14 27.2 23.9g 15DT249 W84 C~2iOW 2015 02 19.18138 09 18 47.82 -06 14 22.8 24.1g 15DT249 W84 C~2iOW 2015 02 19.25015 09 18 47.50 -06 14 20.5 23.7g 15DT249 W84 C~2iOW 2015 02 22.03735 09 18 34.29 -06 12 49.6 15DT249 W84 C~2iOW 2015 02 22.10495 09 18 33.94 -06 12 47.2 15DT249 W84 C~2iOW 2015 02 22.17250 09 18 33.60 -06 12 44.9 15DT249 W84 C~2iOW 2015 02 22.24125 09 18 33.27 -06 12 42.2 15DT249 W84 C~2iOW
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 0.12 0.00 -0.08
2 0.0002 -5.57 -0.01 0.62 0.15
3 0.0023 -66.00 -0.01 5.35 -0.02
4 0.0027 -76.71 0.01 6.22 0.02
5 0.0029 -82.15 -0.00 6.47 -0.16
6 0.0031 -87.55 0.17 7.05 -0.03
7 0.0050 -143.85 0.02 12.14 0.05
8 0.0054 -155.01 -0.33 12.95 -0.04
9 0.0056 -160.27 -0.14 13.58 0.12
10 0.0132 -376.10 0.51 35.55 -0.09
11 0.0134 -381.81 0.09 36.13 -0.08
12 0.0136 -387.36 -0.15 36.65 -0.12
13 0.0138 -392.89 -0.28 37.61 0.26
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.
15DT249 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