Orbit Fit and Astrometric record for 15DW224

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: 15DW224   
# Created Tue Dec 12 02:38:13 2017
# Orbit generated from Bernstein formalism
# Fitting   37 observations of   38
# Arc:   4.10y
# First observation: 2011/04/13
#  Last observation: 2015/05/18
Preliminary a, adot, b, bdot, g, gdot:
   0.000030   0.034081   0.000000  -0.012513   0.026710   0.000000
# Chi-squared of fit:    11.93 DOF:   68 RMS:  0.10
# Min/Max residuals:    -0.25    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.982332E-05  3.412590E-02 -7.697498E-06 -1.254024E-02  2.746005E-02  6.624641E-04
# Covariance matrix:
  2.0337E-13 -2.1777E-13 -1.2100E-14  6.4084E-14 -1.1044E-13 -1.2220E-12
 -2.1777E-13  9.2082E-13  6.2691E-14 -3.3355E-13  4.7957E-13  6.3418E-12
 -1.2100E-14  6.2691E-14  1.7302E-13 -6.6299E-14  3.3638E-14  4.3868E-13
  6.4084E-14 -3.3355E-13 -6.6299E-14  1.3726E-13 -1.7398E-13 -2.3338E-12
 -1.1044E-13  4.7957E-13  3.3638E-14 -1.7398E-13  5.5896E-13  3.3682E-12
 -1.2220E-12  6.3418E-12  4.3868E-13 -2.3338E-12  3.3682E-12  4.4375E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   23.974436 -157.594486   -0.007721    0.408837   -0.919474  2455664.872536
# Heliocentric elements and errors
Epoch:              2455660.5000  =  2011/04/09
Mean Anomaly:            0.50556 +/-     0.004
Argument of Peri:      125.45184 +/-     0.027
Long of Asc Node:       69.54852 +/-     0.000
Inclination:            30.49974 +/-     0.000
Eccentricity:         0.65321107 +/-    0.0001
Semi-Major Axis:    107.59212632 +/-    0.0331
Time of Perihelion: 2455088.0455 +/-       4.7
Perihelion:          37.31175845 +/-    0.0158
Aphelion:           177.87249418 +/-    0.0558
Period (y)             1116.0379 +/-      0.52
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.68598321 +/-    0.0008
Ecliptic Y          -13.07447627 +/-    0.0004
Ecliptic Z           14.79686744 +/-    0.0004
Ecliptic XDOT         0.00076966 +/-    0.0000
Ecliptic YDOT        -0.00335628 +/-    0.0000
Ecliptic ZDOT        -0.00111557 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.33484629 +/-    0.0007
Geocenter to KBO     36.41653620 +/-    0.0010
# Hcoef:  6.45

The following table shows the complete astrometric record for 15DW224. 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 (15DW224) followed by the observatory code and reference code for the source of the astrometry.

2011 04  13.37177  13 58 39.751  +13 32 53.57  21.4i 15DW224   F51  C~1vYK      
2011 04  13.38307  13 58 39.695  +13 32 53.77  21.7i 15DW224   F51  C~1vYK      
2011 04  13.40598  13 58 39.558  +13 32 54.20  21.8r 15DW224   F51  C~1vYK      
2011 04  14.52418  13 58 33.825  +13 33 19.79  21.7i 15DW224   F51  C~1vYK      
2011 04  14.53559  13 58 33.762  +13 33 19.88  21.4i 15DW224   F51  C~1vYK      
2011 04  14.54809  13 58 33.692  +13 33 20.26  21.7r 15DW224   F51  C~1vYK      
2011 04  14.55871  13 58 33.655  +13 33 20.51  22.0r 15DW224   F51  C~1vYK      
2012 04  01.53181  14 05 50.918  +12 03 32.34  21.6i 15DW224   F51  C~1vYK      
2012 04  01.54328  14 05 50.854  +12 03 32.62  21.5i 15DW224   F51  C~1vYK      
2012 04  01.57831  14 05 50.688  +12 03 33.60  21.6i 15DW224   F51  C~1vYK      
2015 02  16.55588  14 26 20.746  +07 25 36.63  22.3w 15DW224   F51  C~1vYK      
2015 02  16.56924  14 26 20.744  +07 25 36.84  22.5w 15DW224   F51  C~1vYK      
2015 02  16.58266  14 26 20.722  +07 25 37.34  22.3w 15DW224   F51  C~1vYK      
2015 02  16.59602  14 26 20.705  +07 25 37.86  22.1w 15DW224   F51  C~1vYK      
2015 03  22.49983  14 24 56.424  +07 43 30.37  22.0w 15DW224   F51  C~1vYK      
2015 03  22.51350  14 24 56.376  +07 43 30.70  22.3w 15DW224   F51  C~1vYK      
2015 03  22.52722  14 24 56.329  +07 43 31.21  22.1w 15DW224   F51  C~1vYK      
2015 03  22.54096  14 24 56.267  +07 43 31.62  22.3w 15DW224   F51  C~1vYK      
2015 03  24.61979  14 24 48.076  +07 44 36.00  22.1w 15DW224   F51  C~1vYK      
2015 03  24.62064  14 24 48.073  +07 44 35.95  21.9w 15DW224   F51  C~1vYK      
2015 03  24.62655  14 24 48.056  +07 44 36.23  22.1w 15DW224   F51  C~1vYK      
2015 03  24.63251  14 24 48.029  +07 44 36.15  22.4w 15DW224   F51  C~1vYK      
2015 03  24.63843  14 24 48.000  +07 44 36.75  22.0w 15DW224   F51  C~1vYK      
2015 04  13.42772  14 23 18.680  +07 53 45.66  22.2w 15DW224   F51  C~1vYK      
2015 04  13.44205  14 23 18.607  +07 53 46.05  22.1w 15DW224   F51  C~1vYK      
2015 04  13.45644  14 23 18.556  +07 53 46.94  22.1w 15DW224   F51  C~1vYK      
2015 04  13.47116  14 23 18.467  +07 53 46.61  22.1w 15DW224   F51  C~1vYK      
2015 04  23.49565  14 22 28.053  +07 57 20.12  22.3w 15DW224   F51  C~1vYK      
2015 04  23.50990  14 22 27.963  +07 57 20.33  22.0w 15DW224   F51  C~1vYL      
2015 04  23.52409  14 22 27.889  +07 57 20.57  22.2w 15DW224   F51  C~1vYL      
2015 04  23.53834  14 22 27.840  +07 57 20.90  22.4w 15DW224   F51  C~1vYL      
2015 04  24.52825  14 22 22.764  +07 57 38.69  22.0w 15DW224   F51  C~1vYL      
2015 04  24.55661  14 22 22.614  +07 57 39.40  22.2w 15DW224   F51  C~1vYL      
2015 04  24.57084  14 22 22.562  +07 57 39.60  22.3w 15DW224   F51  C~1vYL      
2015 05  18.42782  14 20 22.707  +08 01 42.46  22.2w 15DW224   F51  C~1vYL      
2015 05  18.44011  14 20 22.646  +08 01 42.49  22.1w 15DW224   F51  C~1vYL      
2015 05  18.45242  14 20 22.599  +08 01 42.69  22.2w 15DW224   F51  C~1vYL      
2015 05  18.46472  14 20 22.533  +08 01 42.53  22.1w 15DW224   F51  C~1vYL      

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    -0.04       0.00     0.10
  2   0.0000     -0.83     0.03      -0.12     0.06
  3   0.0001     -2.84    -0.17      -0.48    -0.14
  4   0.0032    -89.91     0.03      -8.41     0.07
  5   0.0032    -90.80     0.04      -8.68    -0.11
  6   0.0032    -91.89    -0.06      -8.71    -0.04
  7   0.0032    -92.48     0.18      -8.68     0.08
  8   0.9696   7879.20     0.04   -2550.73     0.07
  9   0.9697   7878.23    -0.06   -2550.83    -0.03
 10   0.9698   7875.60     0.00   -2550.87    -0.06
 11   3.8472  31402.25    -0.09  -10852.67     0.03
 12   3.8472  31402.13     0.14  -10852.49    -0.07
 13   3.8473  31401.62    -0.03  -10852.16    -0.03
 14   3.8473  31401.17    -0.13  -10851.77     0.07
 15   3.9401  29785.93    -0.08  -10354.36     0.03
 16   3.9402  29785.13     0.04  -10354.34    -0.03
 17   3.9402  29784.26     0.11  -10354.14     0.09
 18   3.9402  29783.23     0.01  -10354.13     0.03
 19   3.9459  29642.86     0.02  -10342.86    -0.06
 20   3.9459  29642.84     0.06  -10342.92    -0.13
 21   3.9459  29642.49     0.12  -10342.76     0.01
 22   3.9460  29642.15     0.19  -10342.99    -0.25
 23   3.9460  29641.50    -0.05  -10342.61     0.11
 24   4.0002  28175.40    -0.10  -10361.37     0.08
 25   4.0002  28174.23    -0.14  -10361.43     0.12
 26   4.0002  28173.15 (  -0.07) -10360.91 (   0.75)
 27   4.0003  28172.05    -0.00  -10361.74     0.03
 28   4.0277  27385.16     0.00  -10461.21     0.06
 29   4.0278  27383.82    -0.20  -10461.54    -0.08
 30   4.0278  27382.70    -0.19  -10461.76    -0.11
 31   4.0278  27381.88     0.13  -10461.74     0.10
 32   4.0305  27304.21     0.00  -10475.17    -0.24
 33   4.0306  27301.84    -0.12  -10475.40    -0.07
 34   4.0307  27301.03     0.21  -10475.52     0.01
 35   4.0960  25540.60    -0.00  -10955.82     0.00
 36   4.0960  25539.74    -0.02  -10956.15     0.00
 37   4.0960  25539.01     0.08  -10956.24     0.25
 38   4.0961  25538.16     0.06  -10956.78     0.04

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.

15DW224    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       107.172   107.271   107.073
ecceobj         0.652     0.652     0.651
incobj         30.500    30.500    30.500
qmin           36.332    36.216    35.953
qmax          186.658   186.682   186.407
amean         108.781   108.719   108.850
amin          106.669   106.588   106.475
amax          112.137   112.022   112.231
emean           0.651     0.651     0.654
emin            0.638     0.639     0.642
emax            0.666     0.667     0.668
imean          29.856    29.815    29.584
imin           28.900    28.904    28.515
imax           30.627    30.522    30.377
excite_mean     0.820     0.819     0.819
fracstop        1.000     1.000     1.000
cjmean          2.779     2.779     2.779

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       181.6     180.4     180.5
kozaiamp         56.4      56.0      57.6