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: 19EF8 # Created Sun Dec 22 02:11:05 2024 # Orbit generated from Bernstein formalism # Fitting 9 observations of 9 # Arc: 112.77d # First observation: 2018/11/15 # Last observation: 2019/03/08 Preliminary a, adot, b, bdot, g, gdot: 0.000002 0.026506 0.000005 0.006766 0.026235 0.000000 # Chi-squared of fit: 2.68 DOF: 12 RMS: 0.10 # Min/Max residuals: -0.21 0.21 # Exact a, adot, b, bdot, g, gdot: 1.685921E-05 2.563310E-02 3.970746E-06 6.573791E-03 2.555211E-02 8.018567E-03 # Covariance matrix: 4.8571E-13 -3.3822E-12 4.2857E-15 -1.4955E-13 2.2404E-13 1.0712E-10 -3.3822E-12 7.5210E-10 8.3104E-12 1.2981E-10 3.8477E-10 3.5249E-08 4.2857E-15 8.3104E-12 4.9033E-13 -2.0630E-14 4.6376E-12 4.4881E-10 -1.4955E-13 1.2981E-10 -2.0630E-14 3.3051E-11 6.9606E-11 6.5442E-09 2.2404E-13 3.8477E-10 4.6376E-12 6.9606E-11 2.1506E-10 2.0835E-08 1.0712E-10 3.5249E-08 4.4881E-10 6.5442E-09 2.0835E-08 2.0952E-06 # lat0 lon0 xBary yBary zBary JD0 -9.858929 148.799749 0.989904 0.016920 0.096745 2458438.047641 # Heliocentric elements and errors Epoch: 2458430.5000 = 2018/11/08 Mean Anomaly: 44.34919 +/- 2.945 Argument of Peri: 248.41953 +/- 2.184 Long of Asc Node: 181.83890 +/- 0.045 Inclination: 17.09318 +/- 0.019 Eccentricity: 0.30356094 +/- 0.0575 Semi-Major Axis: 46.20045373 +/- 1.8809 Time of Perihelion: 2444300.2126 +/- 368.8 Perihelion: 32.17580058 +/- 2.9607 Aphelion: 60.22510688 +/- 3.6141 Period (y) 314.0346 +/- 19.18 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -32.38400660 +/- 0.0189 Ecliptic Y 20.76207784 +/- 0.0115 Ecliptic Z -6.70081577 +/- 0.0039 Ecliptic XDOT -0.00224233 +/- 0.0001 Ecliptic YDOT -0.00185062 +/- 0.0001 Ecliptic ZDOT 0.00054666 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 39.04726228 +/- 0.0169 Geocenter to KBO 39.13570887 +/- 0.0225 # Hcoef: 8.56
The following table shows the complete astrometric record for 19EF8. 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 (19EF8) followed by the observatory code and reference code for the source of the astrometry.
2018 11 15.54684 09 50 05.86 +02 37 55.8 24.4z 19EF8 T09 C~870Y 2018 11 15.57290 09 50 05.90 +02 37 55.2 23.7z 19EF8 T09 C~870Y 2018 11 15.59652 09 50 05.94 +02 37 54.7 23.8z 19EF8 T09 C~870Y 2019 01 06.55500 09 48 56.26 +02 34 19.7 25.1g 19EF8 T09 C~870Y 2019 01 06.56987 09 48 56.21 +02 34 19.9 25.0g 19EF8 T09 C~870Y 2019 01 06.62334 09 48 56.01 +02 34 20.7 25.4g 19EF8 T09 C~870Y 2019 03 08.26663 09 44 19.35 +02 59 40.7 24.9r 19EF8 T09 C~870Y 2019 03 08.30018 09 44 19.21 +02 59 41.9 24.5r 19EF8 T09 C~870Y 2019 03 08.31915 09 44 19.12 +02 59 42.7 24.5r 19EF8 T09 C~870Y
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 0.02
2 0.0001 0.77 -0.01 -0.36 -0.02
3 0.0001 1.50 0.21 -0.63 0.00
4 0.1424 -907.03 0.01 -558.30 -0.08
5 0.1424 -907.81 0.06 -558.37 -0.03
6 0.1426 -910.90 -0.07 -558.64 0.12
7 0.3086 -5326.94 -0.04 -538.22 -0.14
8 0.3087 -5329.33 0.08 -537.80 -0.00
9 0.3088 -5330.87 -0.04 -537.51 0.14
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.
19EF8 quality flag:1 Type: CENTAURS CENTAURS SCATEXTD axisobj 46.592 54.720 42.136 ecceobj 0.311 0.459 0.164 incobj 17.120 17.059 17.183 qmin 29.633 28.874 33.742 qmax 62.382 83.588 50.732 amean 46.036 55.284 42.083 amin 42.614 51.212 41.718 amax 47.560 57.335 42.525 emean 0.299 0.444 0.166 emin 0.269 0.388 0.139 emax 0.324 0.471 0.196 imean 17.384 18.843 17.614 imin 15.281 15.851 16.580 imax 18.959 20.673 18.829 excite_mean 0.423 0.549 0.345 fracstop 1.000 1.000 1.000 cjmean 2.906 2.843 2.937 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 182.2 183.6 179.4 kozaiamp 180.0 180.0 179.9