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: 15DA225
# Created Wed Dec 25 02:10:12 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 18 observations of 18
# Arc: 7.03y
# First observation: 2015/02/18
# Last observation: 2022/03/02
# Chi-squared of fit: 20.49 DOF: 30 RMS: 0.19
# Min/Max residuals: -0.44 0.38
# Exact a, adot, b, bdot, g, gdot:
1.714249E-05 3.028309E-02 -9.074025E-06 -1.585996E-02 2.756031E-02 -6.064465E-03
# Covariance matrix:
2.2007E-13 -1.8522E-13 -2.9924E-14 7.7275E-14 1.4526E-13 -6.8364E-13
-1.8522E-13 3.9278E-13 7.3346E-14 -1.8879E-13 -2.6020E-13 1.6695E-12
-2.9924E-14 7.3346E-14 1.6395E-13 -6.1995E-14 -4.4238E-14 3.2088E-13
7.7275E-14 -1.8879E-13 -6.1995E-14 1.0259E-13 1.1626E-13 -8.2523E-13
1.4526E-13 -2.6020E-13 -4.4238E-14 1.1626E-13 5.2827E-13 -1.0308E-12
-6.8364E-13 1.6695E-12 3.2088E-13 -8.2523E-13 -1.0308E-12 7.2969E-12
# lat0 lon0 xBary yBary zBary JD0
0.906560 122.555684 -0.437114 0.014125 -0.883029 2457071.660548
# Heliocentric elements and errors
Epoch: 2457072.5000 = 2015/02/19
Mean Anomaly: 352.22619 +/- 0.005
Argument of Peri: 206.05627 +/- 0.016
Long of Asc Node: 304.92846 +/- 0.000
Inclination: 27.56555 +/- 0.000
Eccentricity: 0.51920602 +/- 0.0001
Semi-Major Axis: 74.22757343 +/- 0.0212
Time of Perihelion: 2462116.5305 +/- 98.0
Perihelion: 35.68817080 +/- 0.0131
Aphelion: 112.76697605 +/- 0.0333
Period (y) 639.5229 +/- 0.27
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -20.36991445 +/- 0.0005
Ecliptic Y 31.08829433 +/- 0.0008
Ecliptic Z 0.57373977 +/- 0.0000
Ecliptic XDOT -0.00222854 +/- 0.0000
Ecliptic YDOT -0.00211112 +/- 0.0000
Ecliptic ZDOT -0.00158478 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 37.17194461 +/- 0.0007
Geocenter to KBO 36.28422799 +/- 0.0010
# Hcoef: 7.54
The following table shows the complete astrometric record for 15DA225. 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 (15DA225) followed by the observatory code and reference code for the source of the astrometry.
2015 02 18.15977 08 20 12.55 +20 28 18.9 22.5R 15DA225 695 C~1zPy 2015 02 18.20668 08 20 12.31 +20 28 19.2 15DA225 695 C~1zPy 2015 02 18.25255 08 20 12.06 +20 28 19.3 15DA225 695 C~1zPy 2015 03 16.13648 08 18 22.44 +20 29 57.1 22.5R 15DA225 G37 C~1zPy 2015 03 16.20489 08 18 22.21 +20 29 56.7 15DA225 G37 C~1zPy 2015 03 23.14108 08 18 02.77 +20 29 48.8 22.7R 15DA225 695 C~1zPy 2015 03 23.20667 08 18 02.61 +20 29 48.6 15DA225 695 C~1zPy 2015 03 23.26825 08 18 02.45 +20 29 48.5 15DA225 695 C~1zPy 2016 03 13.14698 08 24 46.99 +19 12 52.9 22.7R 15DA225 G37 C~1zPy 2016 03 13.18670 08 24 46.85 +19 12 53.5 15DA225 G37 C~1zPy 2017 12 20.47860 08 44 22.455 +16 19 35.16 23.4R 15DA225 G37 C~2Uy2 2017 12 20.51822 08 44 22.281 +16 19 35.54 15DA225 G37 C~2Uy2 2021 01 11.417360 09 01 04.400 +12 09 59.99 23.4G 15DA225 G37 C~4UG9 2021 01 11.457960 09 01 04.166 +12 10 00.33 15DA225 G37 C~4UG9 2021 01 11.498350 09 01 03.979 +12 10 00.82 15DA225 G37 C~4UG9 2022 03 02.132830 09 02 41.884 +10 55 27.64 23.3G 15DA225 G37 C~5S55 2022 03 02.171140 09 02 41.723 +10 55 27.96 15DA225 G37 C~5S55 2022 03 02.211400 09 02 41.509 +10 55 28.25 15DA225 G37 C~5S55
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 0.05 0.00 -0.02
2 0.0001 0.00 0.13 0.00 -0.06
3 0.0003 0.00 -0.02 0.00 -0.28
4 0.0711 0.00 -0.31 0.00 0.26
5 0.0713 0.00 -0.44 0.00 -0.14
6 0.0903 0.00 0.15 0.00 0.06
7 0.0905 0.00 0.25 0.00 0.02
8 0.0906 0.00 0.19 0.00 0.08
9 1.0650 0.00 -0.00 0.00 -0.11
10 1.0651 0.00 0.03 0.00 0.38
11 2.8373 0.00 -0.03 0.00 -0.20
12 2.8374 0.00 -0.13 0.00 -0.00
13 5.8980 0.00 0.09 0.00 -0.05
14 5.8981 0.00 -0.20 0.00 -0.09
15 5.8983 0.00 0.20 0.00 0.02
16 7.0335 0.00 -0.21 0.00 0.37
17 7.0336 0.00 0.23 0.00 0.06
18 7.0337 0.00 0.02 0.00 -0.31
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.
15DA225 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 73.650 73.649 73.651 ecceobj 0.514 0.514 0.514 incobj 27.612 27.612 27.612 qmin 33.639 33.605 33.777 qmax 115.084 115.915 115.271 amean 73.374 73.463 73.407 amin 72.200 72.275 72.271 amax 75.058 75.341 75.008 emean 0.521 0.522 0.521 emin 0.500 0.498 0.498 emax 0.540 0.540 0.540 imean 28.509 28.537 28.570 imin 27.572 27.542 27.744 imax 29.757 29.816 29.875 excite_mean 0.707 0.707 0.707 fracstop 1.000 1.000 1.000 cjmean 2.751 2.750 2.751 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 172.9 173.6 180.0 kozaiamp 180.0 180.0 180.0