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: 15DC225
# Created Fri Jan 24 02:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting 11 observations of 11
# Arc: 56.06d
# First observation: 2015/02/18
# Last observation: 2015/04/15
Preliminary a, adot, b, bdot, g, gdot:
-0.000014 0.047088 -0.000005 0.004573 0.030461 0.000000
# Chi-squared of fit: 2.95 DOF: 16 RMS: 0.09
# Min/Max residuals: -0.26 0.17
# Exact a, adot, b, bdot, g, gdot:
1.669696E-05 2.980785E-02 2.825872E-06 4.585179E-03 2.761954E-02 4.019206E-03
# Covariance matrix:
6.4426E-13 3.0805E-10 -1.0599E-13 -1.6921E-13 5.1470E-11 6.2338E-11
3.0805E-10 6.1886E-07 -2.0289E-10 -7.3465E-10 1.0035E-07 -4.5233E-07
-1.0599E-13 -2.0289E-10 4.5603E-13 -3.0162E-12 -3.2940E-11 1.3672E-10
-1.6921E-13 -7.3465E-10 -3.0162E-12 4.2495E-11 -1.1711E-10 1.1279E-09
5.1470E-11 1.0035E-07 -3.2940E-11 -1.1711E-10 1.6282E-08 -7.0431E-08
6.2338E-11 -4.5233E-07 1.3672E-10 1.1279E-09 -7.0431E-08 1.1855E-06
# lat0 lon0 xBary yBary zBary JD0
2.427927 176.675985 0.457301 0.037125 -0.872117 2457071.795258
# Heliocentric elements and errors
Epoch: 2457070.5000 = 2015/02/17
Mean Anomaly: 32.71961 +/- 10.232
Argument of Peri: 328.21927 +/- 15.654
Long of Asc Node: 160.92772 +/- 0.380
Inclination: 9.06337 +/- 0.219
Eccentricity: 0.18749456 +/- 0.0290
Semi-Major Axis: 43.34987457 +/- 1.7079
Time of Perihelion: 2447595.3575 +/- 2909.5
Perihelion: 35.22200890 +/- 1.8731
Aphelion: 51.47774024 +/- 2.3867
Period (y) 285.4237 +/- 16.87
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -36.96086311 +/- 0.1668
Ecliptic Y 2.60457924 +/- 0.0097
Ecliptic Z 1.53388980 +/- 0.0071
Ecliptic XDOT -0.00055313 +/- 0.0001
Ecliptic YDOT -0.00293341 +/- 0.0001
Ecliptic ZDOT 0.00047108 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 37.08425613 +/- 0.1663
Geocenter to KBO 36.20624634 +/- 0.1673
# Hcoef: 7.78
The following table shows the complete astrometric record for 15DC225. 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 (15DC225) followed by the observatory code and reference code for the source of the astrometry.
2015 02 18.29448 11 51 39.78 +03 32 58.1 22.7R 15DC225 695 C~1zPy 2015 02 18.38762 11 51 39.38 +03 33 01.3 15DC225 695 C~1zPy 2015 02 18.47664 11 51 38.99 +03 33 04.0 15DC225 695 C~1zPy 2015 03 16.27118 11 49 38.31 +03 47 50.6 23.2R 15DC225 G37 C~1zPy 2015 03 16.34354 11 49 37.95 +03 47 53.3 15DC225 G37 C~1zPy 2015 03 23.16519 11 49 04.24 +03 51 50.5 23.3R 15DC225 695 C~1zPy 2015 03 23.22929 11 49 03.92 +03 51 52.6 15DC225 695 C~1zPy 2015 03 23.28872 11 49 03.61 +03 51 54.7 15DC225 695 C~1zPy 2015 04 15.20534 11 47 17.07 +04 04 00.4 23.2R 15DC225 695 C~1zPy 2015 04 15.28229 11 47 16.76 +04 04 02.4 15DC225 695 C~1zPy 2015 04 15.35550 11 47 16.45 +04 04 04.4 15DC225 695 C~1zPy
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 0.08 0.00 -0.04
2 0.0003 -6.77 -0.02 0.55 0.13
3 0.0005 -13.20 -0.06 0.71 -0.08
4 0.0711 -2023.33 0.01 95.93 -0.10
5 0.0713 -2029.34 -0.00 96.27 0.07
6 0.0900 -2586.65 0.03 113.52 0.08
7 0.0902 -2591.88 0.08 113.54 -0.02
8 0.0903 -2596.97 -0.11 113.63 -0.04
9 0.1531 -4348.83 -0.26 146.86 0.02
10 0.1533 -4353.88 0.09 146.86 0.00
11 0.1535 -4358.94 0.17 146.86 -0.02
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.
15DC225 quality flag:1 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 42.982 49.874 38.205 ecceobj 0.182 0.278 0.158 incobj 9.097 8.444 9.833 qmin 33.783 35.221 30.426 qmax 53.107 65.664 47.760 amean 43.100 50.049 37.617 amin 42.642 49.468 34.810 amax 43.668 50.753 39.438 emean 0.170 0.279 0.136 emin 0.129 0.264 0.046 emax 0.216 0.297 0.214 imean 7.557 7.354 8.447 imin 2.005 6.592 6.271 imax 10.185 8.371 10.433 excite_mean 0.219 0.307 0.202 fracstop 1.000 1.000 1.000 cjmean 3.033 3.057 2.990 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 177.0 176.6 177.4 kozaiamp 180.0 179.9 180.0