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: 19EW9 # Created Tue Apr 1 01:11:13 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 23 observations of 23 # Arc: 13.07y # First observation: 2012/01/28 # Last observation: 2025/02/23 # Chi-squared of fit: 14.27 DOF: 40 RMS: 0.14 # Min/Max residuals: -0.62 0.25 # Exact a, adot, b, bdot, g, gdot: 1.256370E-05 1.736136E-02 3.064451E-06 3.402730E-03 2.077064E-02 -3.995126E-03 # Covariance matrix: 6.7325E-13 -1.3488E-13 5.7238E-14 -1.9185E-14 6.5940E-14 -3.6003E-13 -1.3488E-13 5.5396E-14 -2.9756E-14 9.9218E-15 1.1335E-13 1.8824E-13 5.7238E-14 -2.9756E-14 3.4737E-13 -4.5456E-14 -6.7849E-14 -1.1285E-13 -1.9185E-14 9.9218E-15 -4.5456E-14 7.7478E-15 2.2447E-14 3.7629E-14 6.5940E-14 1.1335E-13 -6.7849E-14 2.2447E-14 7.6059E-13 4.3285E-13 -3.6003E-13 1.8824E-13 -1.1285E-13 3.7629E-14 4.3285E-13 7.1394E-13 # lat0 lon0 xBary yBary zBary JD0 -0.307089 168.762123 0.641614 -0.004003 -0.748173 2455955.153343 # Heliocentric elements and errors Epoch: 2455954.5000 = 2012/01/28 Mean Anomaly: 268.83777 +/- 0.046 Argument of Peri: 115.77100 +/- 0.026 Long of Asc Node: 169.54304 +/- 0.000 Inclination: 11.14299 +/- 0.000 Eccentricity: 0.23807948 +/- 0.0000 Semi-Major Axis: 46.16593735 +/- 0.0070 Time of Perihelion: 2484967.5484 +/- 24.3 Perihelion: 35.17477504 +/- 0.0056 Aphelion: 57.15709965 +/- 0.0088 Period (y) 313.6828 +/- 0.07 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -47.82690588 +/- 0.0020 Ecliptic Y 10.15845991 +/- 0.0004 Ecliptic Z -0.25789725 +/- 0.0000 Ecliptic XDOT 0.00006366 +/- 0.0000 Ecliptic YDOT -0.00234233 +/- 0.0000 Ecliptic ZDOT 0.00045143 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 48.89466938 +/- 0.0019 Geocenter to KBO 48.14506106 +/- 0.0020 # Hcoef: 7.17
The following table shows the complete astrometric record for 19EW9. 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 (19EW9) followed by the observatory code and reference code for the source of the astrometry.
2012 01 28.652577 11 18 11.55 +04 09 48.3 19EW9 T14 C~8Sg5 2012 01 28.658049 11 18 11.52 +04 09 48.7 19EW9 T14 C~8Sg5 2016 03 17.424991 11 31 29.29 +03 38 27.0 19EW9 T09 C~8Sg5 2016 03 17.567553 11 31 28.70 +03 38 31.0 19EW9 T09 C~8Sg5 2017 03 24.211426 11 35 12.559 +03 28 01.52 24.0V 19EW9 W84 C~8Sg5 2018 03 18.50304 11 39 47.15 +03 11 41.4 23.6i 19EW9 T09 C~8Sg5 2018 03 18.56001 11 39 46.92 +03 11 42.9 23.7i 19EW9 T09 C~8Sg5 2018 03 18.57604 11 39 46.86 +03 11 43.2 24.0i 19EW9 T09 C~8Sg5 2018 04 24.351987 11 37 34.68 +03 27 00.9 19EW9 T09 C~8Sg5 2018 04 24.485347 11 37 34.28 +03 27 03.6 19EW9 T09 C~8Sg5 2019 02 05.455206 11 46 30.81 +02 39 45.9 19EW9 T09 C~8Sg5 2019 02 05.508896 11 46 30.65 +02 39 47.1 19EW9 T09 C~8Sg5 2019 03 02.43089 11 45 04.91 +02 50 16.2 23.4y 19EW9 T09 C~8Sg5 2019 03 02.51613 11 45 04.56 +02 50 19.1 22.9y 19EW9 T09 C~8Sg5 2019 03 02.52968 11 45 04.51 +02 50 19.7 23.6y 19EW9 T09 C~8Sg5 2019 03 02.55653 11 45 04.42 +02 50 20.4 23.5y 19EW9 T09 C~8Sg5 2019 03 08.34835 11 44 41.74 +02 53 02.1 24.0r 19EW9 T09 C~8Sg5 2019 03 08.35813 11 44 41.71 +02 53 02.4 24.0r 19EW9 T09 C~8Sg5 2019 03 08.40222 11 44 41.54 +02 53 03.8 23.8r 19EW9 T09 C~8Sg5 2019 03 08.43185 11 44 41.41 +02 53 04.4 23.9r 19EW9 T09 C~8Sg5 2025 02 23.429490 12 11 30.504 +01 21 10.23 23.7G 19EW9 G37 C~8iif 2025 02 23.471790 12 11 30.342 +01 21 11.18 19EW9 G37 C~8iif 2025 02 23.523080 12 11 30.160 +01 21 12.39 19EW9 G37 C~8iif
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 0.09 0.00 -0.14
2 0.0000 0.00 -0.13 0.00 0.15
3 4.1335 0.00 0.18 0.00 -0.09
4 4.1339 0.00 -0.07 0.00 -0.02
5 5.1514 0.00 0.06 0.00 -0.00
6 6.1351 0.00 -0.09 0.00 0.13
7 6.1353 0.00 -0.08 0.00 0.04
8 6.1353 0.00 -0.00 0.00 -0.11
9 6.2360 0.00 0.06 0.00 -0.02
10 6.2364 0.00 -0.03 0.00 0.01
11 7.0220 0.00 0.08 0.00 0.06
12 7.0222 0.00 0.06 0.00 0.08
13 7.0904 0.00 0.11 0.00 -0.62
14 7.0907 0.00 -0.11 0.00 -0.08
15 7.0907 0.00 -0.06 0.00 0.15
16 7.0908 0.00 0.17 0.00 0.11
17 7.1066 0.00 -0.19 0.00 0.07
18 7.1067 0.00 -0.05 0.00 0.09
19 7.1068 0.00 0.06 0.00 0.25
20 7.1069 0.00 -0.10 0.00 0.02
21 13.0726 0.00 0.11 0.00 0.16
22 13.0727 0.00 -0.05 0.00 -0.02
23 13.0729 0.00 -0.04 0.00 -0.18
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.
19EW9 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 46.110 46.110 46.110 ecceobj 0.238 0.238 0.238 incobj 11.157 11.157 11.157 qmin 34.704 34.778 34.645 qmax 58.342 58.327 58.312 amean 46.220 46.250 46.199 amin 45.541 45.750 45.739 amax 46.810 46.811 46.810 emean 0.231 0.229 0.230 emin 0.216 0.212 0.212 emax 0.248 0.247 0.249 imean 11.035 11.131 10.880 imin 10.055 10.234 9.639 imax 11.945 12.130 11.991 excite_mean 0.300 0.300 0.298 fracstop 1.000 1.000 1.000 cjmean 3.018 3.019 3.019 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 180.3 181.6 184.6 kozaiamp 179.9 180.0 179.9