Orbit Fit and Astrometric record for 15DC225

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 Mon Dec 11 02:38:14 2017
# 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:
  1.669697E-05  2.980784E-02  2.825871E-06  4.585179E-03  2.761954E-02  4.019206E-03
# Covariance matrix:
  6.4426E-13  3.0805E-10 -1.0599E-13 -1.6921E-13  5.1471E-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  1.1278E-09
  5.1471E-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  1.1278E-09 -7.0431E-08  1.1855E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.427927  176.675985    0.457302    0.037125   -0.872116  2457071.795258
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           32.71965 +/-    10.232
Argument of Peri:      328.21923 +/-    15.654
Long of Asc Node:      160.92772 +/-     0.380
Inclination:             9.06337 +/-     0.219
Eccentricity:         0.18749442 +/-    0.0290
Semi-Major Axis:     43.34986556 +/-    1.7079
Time of Perihelion: 2447595.3487 +/-    2909.5
Perihelion:          35.22200772 +/-    1.8731
Aphelion:            51.47772340 +/-    2.3867
Period (y)              285.4236 +/-     16.87
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.96086390 +/-    0.1668
Ecliptic Y            2.60457929 +/-    0.0097
Ecliptic Z            1.53388983 +/-    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   37.08425692 +/-    0.1663
Geocenter to KBO     36.20624713 +/-    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           33.005    34.960    31.809
qmax           54.742    66.023    46.593
amean          43.174    50.099    38.581
amin           42.273    49.470    37.648
amax           44.271    50.814    39.478
emean           0.179     0.282     0.141
emin            0.140     0.267     0.100
emax            0.238     0.301     0.184
imean           7.874     7.513     8.548
imin            4.137     6.670     6.586
imax           10.317     8.517    10.742
excite_mean     0.228     0.311     0.205
fracstop        1.000     1.000     1.000
cjmean          3.029     3.054     2.997

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       179.0     173.5     183.9
kozaiamp        180.0     180.0     180.0