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: 15DA250 # Created Sun Nov 24 02:10:14 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 28 observations of 28 # Arc: 9.16y # First observation: 2015/02/17 # Last observation: 2024/04/14 # Chi-squared of fit: 33.50 DOF: 50 RMS: 0.19 # Min/Max residuals: -0.48 0.53 # Exact a, adot, b, bdot, g, gdot: 1.708742E-05 2.460849E-02 -8.369035E-06 -1.218839E-02 2.475770E-02 -7.417725E-03 # Covariance matrix: 1.0544E-13 2.5921E-14 2.8340E-15 -8.3496E-15 2.3789E-13 5.5202E-14 2.5921E-14 2.7012E-13 4.7027E-14 -1.0953E-13 7.2497E-13 8.8137E-13 2.8340E-15 4.7027E-14 7.7786E-14 -3.0568E-14 1.1313E-13 1.6441E-13 -8.3496E-15 -1.0953E-13 -3.0568E-14 5.2711E-14 -2.7119E-13 -3.7928E-13 2.3789E-13 7.2497E-13 1.1313E-13 -2.7119E-13 2.5985E-12 2.1294E-12 5.5202E-14 8.8137E-13 1.6441E-13 -3.7928E-13 2.1294E-12 3.0769E-12 # lat0 lon0 xBary yBary zBary JD0 -7.829712 157.623979 0.167815 -0.132061 -0.961777 2457070.599913 # Heliocentric elements and errors Epoch: 2457070.5000 = 2015/02/17 Mean Anomaly: 341.78271 +/- 0.014 Argument of Peri: 247.52672 +/- 0.012 Long of Asc Node: 322.32570 +/- 0.000 Inclination: 27.31678 +/- 0.000 Eccentricity: 0.45803808 +/- 0.0002 Semi-Major Axis: 67.52970842 +/- 0.0327 Time of Perihelion: 2467327.5406 +/- 139.8 Perihelion: 36.59853033 +/- 0.0234 Aphelion: 98.46088652 +/- 0.0500 Period (y) 554.9457 +/- 0.40 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -37.83907211 +/- 0.0024 Ecliptic Y 15.75770772 +/- 0.0010 Ecliptic Z -5.50288859 +/- 0.0004 Ecliptic XDOT -0.00011838 +/- 0.0000 Ecliptic YDOT -0.00290128 +/- 0.0000 Ecliptic ZDOT -0.00122346 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 41.35696506 +/- 0.0022 Geocenter to KBO 40.39168677 +/- 0.0026 # Hcoef: 7.18
The following table shows the complete astrometric record for 15DA250. 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 (15DA250) followed by the observatory code and reference code for the source of the astrometry.
2015 02 17.099135 10 25 36.310 +01 26 02.83 22.8r 15DA250 W84 C~7REp 2015 02 17.166593 10 25 35.989 +01 26 04.13 23.5g 15DA250 W84 C~7REp 2015 02 17.184105 10 25 35.894 +01 26 04.49 23.5g 15DA250 W84 C~7REp 2015 02 17.25213 10 25 35.59 +01 26 05.2 24.2g 15DA250 W84 C~2iOX 2015 02 17.32096 10 25 35.25 +01 26 06.6 23.9g 15DA250 W84 C~2iOX 2015 02 17.36798 10 25 35.03 +01 26 07.6 24.1g 15DA250 W84 C~2iOX 2015 02 18.09516 10 25 31.57 +01 26 21.2 23.6g 15DA250 W84 C~2iOX 2015 02 18.163122 10 25 31.211 +01 26 23.03 23.7g 15DA250 W84 C~7REp 2015 02 18.23094 10 25 30.90 +01 26 23.9 15DA250 W84 C~2iOX 2015 02 18.30118 10 25 30.55 +01 26 25.2 23.6g 15DA250 W84 C~2iOX 2015 02 19.09193 10 25 26.77 +01 26 40.2 24.0g 15DA250 W84 C~2iOX 2015 02 22.08440 10 25 12.36 +01 27 38.4 15DA250 W84 C~2iOX 2015 02 22.22030 10 25 11.69 +01 27 41.4 15DA250 W84 C~2iOX 2015 02 22.28906 10 25 11.38 +01 27 42.8 15DA250 W84 C~2iOX 2015 02 24.13646 10 25 02.45 +01 28 20.0 15DA250 W84 C~2iOX 2015 02 24.19810 10 25 02.16 +01 28 21.4 15DA250 W84 C~2iOX 2015 03 28.116240 10 22 38.007 +01 40 09.37 22.3z 15DA250 W84 C~7REp 2017 03 23.08509 10 31 28.55 -00 43 42.8 23.6V 15DA250 W84 C~7REp 2017 03 24.12561 10 31 24.10 -00 43 17.8 15DA250 W84 C~7REp 2017 03 25.05774 10 31 20.16 -00 42 55.3 15DA250 W84 C~7REp 2017 03 25.15902 10 31 19.73 -00 42 52.9 15DA250 W84 C~7REp 2017 04 02.27803 10 30 47.28 -00 39 39.8 23.3r 15DA250 T09 C~7wMj 2017 04 02.28858 10 30 47.22 -00 39 39.4 23.3r 15DA250 T09 C~7wMj 2017 04 02.35631 10 30 46.98 -00 39 37.6 23.3r 15DA250 T09 C~7wMj 2017 04 02.36486 10 30 46.93 -00 39 37.8 23.3r 15DA250 T09 C~7wMj 2024 04 14.140710 11 01 53.467 -09 21 14.01 23.0G 15DA250 G37 C~7znc 2024 04 14.181580 11 01 53.300 -09 21 12.69 15DA250 G37 C~7znc 2024 04 14.223100 11 01 53.145 -09 21 11.69 15DA250 G37 C~7znc
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 -0.22 0.00 0.22
2 0.0002 0.00 -0.13 0.00 0.26
3 0.0002 0.00 -0.27 0.00 0.29
4 0.0004 0.00 0.13 0.00 -0.27
5 0.0006 0.00 0.04 0.00 -0.15
6 0.0007 0.00 0.16 0.00 -0.03
7 0.0027 0.00 0.23 0.00 -0.10
8 0.0029 0.00 -0.20 0.00 0.44
9 0.0031 0.00 0.09 0.00 0.03
10 0.0033 0.00 -0.03 0.00 -0.01
11 0.0055 0.00 -0.01 0.00 -0.09
12 0.0136 0.00 -0.08 0.00 -0.48
13 0.0140 0.00 -0.16 0.00 -0.20
14 0.0142 0.00 0.24 0.00 -0.17
15 0.0193 0.00 -0.24 0.00 -0.33
16 0.0194 0.00 -0.06 0.00 -0.19
17 0.1068 0.00 0.00 0.00 0.53
18 2.0944 0.00 0.05 0.00 -0.01
19 2.0973 0.00 0.07 0.00 -0.10
20 2.0998 0.00 0.05 0.00 -0.04
21 2.1001 0.00 0.11 0.00 -0.08
22 2.1223 0.00 0.16 0.00 0.04
23 2.1224 0.00 -0.13 0.00 0.20
24 2.1225 0.00 0.19 0.00 0.41
25 2.1226 0.00 -0.06 0.00 0.01
26 9.1555 0.00 0.09 0.00 -0.03
27 9.1556 0.00 -0.10 0.00 0.08
28 9.1557 0.00 -0.08 0.00 -0.15
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.
15DA250 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 66.548 66.547 66.548 ecceobj 0.450 0.450 0.450 incobj 27.399 27.399 27.399 qmin 35.833 35.834 35.762 qmax 99.638 99.643 99.633 amean 66.935 66.932 66.980 amin 66.111 66.112 66.114 amax 68.141 68.039 68.383 emean 0.446 0.446 0.446 emin 0.428 0.427 0.428 emax 0.464 0.465 0.465 imean 29.103 29.107 29.132 imin 28.465 28.465 28.439 imax 29.926 29.918 30.007 excite_mean 0.660 0.660 0.660 fracstop 1.000 1.000 1.000 cjmean 2.781 2.781 2.781 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 171.9 172.0 175.5 kozaiamp 180.0 180.0 180.0