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: 19GW198 # Created Tue Jun 17 01:11:24 2025 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 54.02d # First observation: 2019/04/07 # Last observation: 2019/05/31 Preliminary a, adot, b, bdot, g, gdot: 0.000000 0.021401 0.000000 -0.000857 0.023240 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 4.32 DOF: 15 RMS: 0.12 # Min/Max residuals: -0.26 0.26 # Exact a, adot, b, bdot, g, gdot: 1.369438E-05 1.979825E-02 -3.760037E-07 -4.442812E-04 2.292393E-02 8.958803E-03 # Covariance matrix: 8.7923E-13 3.3171E-10 -1.9045E-14 -7.1649E-11 1.2577E-10 -1.6527E-09 3.3171E-10 1.8712E-07 -8.4715E-12 -4.0939E-08 6.7455E-08 -2.2922E-06 -1.9045E-14 -8.4715E-12 2.4810E-13 2.3714E-14 -3.6357E-12 -1.5040E-10 -7.1649E-11 -4.0939E-08 2.3714E-14 9.0325E-09 -1.4568E-08 5.8560E-07 1.2577E-10 6.7455E-08 -3.6357E-12 -1.4568E-08 2.5140E-08 -4.6830E-07 -1.6527E-09 -2.2922E-06 -1.5040E-10 5.8560E-07 -4.6830E-07 1.8465E-04 # lat0 lon0 xBary yBary zBary JD0 -5.885973 158.267191 -0.619062 -0.080553 -0.781484 2458580.818441 # Heliocentric elements and errors Epoch: 2458580.5000 = 2019/04/07 Mean Anomaly: 64.81487 +/- 68.842 Argument of Peri: 143.37896 +/- 28.356 Long of Asc Node: 261.63591 +/- 2.099 Inclination: 5.92267 +/- 0.047 Eccentricity: 0.42274394 +/- 0.5277 Semi-Major Axis: 44.72306010 +/- 22.9232 Time of Perihelion: 2438912.1551 +/- 14413.3 Perihelion: 25.81665736 +/- 27.0573 Aphelion: 63.62946284 +/- 40.2574 Period (y) 299.0925 +/- 229.95 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -41.26592930 +/- 0.2788 Ecliptic Y 15.77504912 +/- 0.1112 Ecliptic Z -4.47343857 +/- 0.0309 Ecliptic XDOT -0.00185086 +/- 0.0015 Ecliptic YDOT -0.00180538 +/- 0.0006 Ecliptic ZDOT -0.00016272 +/- 0.0002 # Distances at JD0 (AU) Heliocenter to KBO 44.40428750 +/- 0.2621 Geocenter to KBO 43.62253051 +/- 0.3017 # Hcoef: 7.82
The following table shows the complete astrometric record for 19GW198. 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 (19GW198) followed by the observatory code and reference code for the source of the astrometry.
2019 04 07.31764 10 30 51.12 +03 00 18.4 24.6g 19GW198 T09 C~8r99 2019 04 07.33445 10 30 51.05 +03 00 18.6 25.0g 19GW198 T09 C~8r99 2019 04 07.36873 10 30 50.97 +03 00 19.8 25.6g 19GW198 T09 C~8r99 2019 04 08.25500 10 30 48.17 +03 00 41.0 23.6y 19GW198 T09 C~8r99 2019 04 08.34681 10 30 47.88 +03 00 43.0 23.7y 19GW198 T09 C~8r9A 2019 04 08.37381 10 30 47.80 +03 00 43.8 24.0y 19GW198 T09 C~8r9A 2019 05 31.27434 10 29 45.15 +03 13 26.2 24.3r 19GW198 T09 C~8r9A 2019 05 31.29672 10 29 45.18 +03 13 26.2 24.4r 19GW198 T09 C~8r9A 2019 05 31.32287 10 29 45.21 +03 13 26.3 24.1r 19GW198 T09 C~8r9A 2019 05 31.34172 10 29 45.23 +03 13 26.3 24.5r 19GW198 T09 C~8r9A
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 -0.01 0.00 0.01
2 0.0000 -1.05 -0.14 -0.20 -0.26
3 0.0001 -2.61 0.16 0.47 0.26
4 0.0026 -49.42 -0.09 4.65 0.05
5 0.0028 -54.19 0.03 4.90 -0.12
6 0.0029 -55.60 0.06 5.20 0.06
7 0.1477 -1209.42 -0.18 366.44 -0.03
8 0.1478 -1209.01 -0.02 366.61 -0.03
9 0.1479 -1208.63 0.07 366.87 0.04
10 0.1479 -1208.35 0.13 366.98 0.01
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.
19GW198 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