Orbit Fit and Astrometric record for 15DX224

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: 15DX224   
# Created Tue Oct 24 01:38:33 2017
# Orbit generated from Bernstein formalism
# Fitting   30 observations of   30
# Arc:   3.23y
# First observation: 2012/03/29
#  Last observation: 2015/06/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000046   0.033081   0.000010  -0.005580   0.027358   0.000000
# Chi-squared of fit:     8.08 DOF:   54 RMS:  0.09
# Min/Max residuals:    -0.18    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.951620E-05  3.255167E-02 -4.190295E-06 -5.494180E-03  2.723840E-02 -5.746569E-03
# Covariance matrix:
  3.6541E-13 -3.0099E-13 -6.6288E-15  3.2271E-14 -1.4411E-13 -1.8017E-12
 -3.0099E-13  1.0855E-12  3.8037E-14 -1.8199E-13  6.9295E-13  1.0074E-11
 -6.6288E-15  3.8037E-14  3.3108E-13 -1.1932E-13  2.2384E-14  3.7184E-13
  3.2271E-14 -1.8199E-13 -1.1932E-13  7.7024E-14 -1.1340E-13 -1.7715E-12
 -1.4411E-13  6.9295E-13  2.2384E-14 -1.1340E-13  6.7318E-13  6.4516E-12
 -1.8017E-12  1.0074E-11  3.7184E-13 -1.7715E-12  6.4516E-12  9.7848E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   17.182105 -152.017673    0.324714    0.279907   -0.905293  2456015.965506
# Heliocentric elements and errors
Epoch:              2456010.5000  =  2012/03/24
Mean Anomaly:          349.03611 +/-     0.014
Argument of Peri:      151.61815 +/-     0.044
Long of Asc Node:       87.21115 +/-     0.001
Inclination:            19.21685 +/-     0.000
Eccentricity:         0.46557030 +/-    0.0002
Semi-Major Axis:     66.82900727 +/-    0.0230
Time of Perihelion: 2462087.7627 +/-       7.1
Perihelion:          35.71540598 +/-    0.0205
Aphelion:            97.94260857 +/-    0.0375
Period (y)              546.3308 +/-      0.28
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.95996251 +/-    0.0009
Ecliptic Y          -16.61367859 +/-    0.0005
Ecliptic Z           10.84521772 +/-    0.0003
Ecliptic XDOT         0.00187355 +/-    0.0000
Ecliptic YDOT        -0.00270319 +/-    0.0000
Ecliptic ZDOT        -0.00069813 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.61744632 +/-    0.0008
Geocenter to KBO     36.71287473 +/-    0.0011
# Hcoef:  6.44

The following table shows the complete astrometric record for 15DX224. 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 (15DX224) followed by the observatory code and reference code for the source of the astrometry.

2012 03  29.46474  14 08 18.585  +05 19 13.59  22.1w 15DX224   F51  C~1vYL      
2012 03  29.47907  14 08 18.519  +05 19 13.76  22.1w 15DX224   F51  C~1vYL      
2012 03  29.49351  14 08 18.465  +05 19 14.12  22.1w 15DX224   F51  C~1vYL      
2012 03  29.50803  14 08 18.397  +05 19 14.72  22.2w 15DX224   F51  C~1vYL      
2014 04  05.43282  14 21 03.581  +03 26 28.36  22.4w 15DX224   F51  C~1vYL      
2014 04  05.44505  14 21 03.524  +03 26 28.70  22.1w 15DX224   F51  C~1vYL      
2014 04  05.45731  14 21 03.464  +03 26 29.12  22.4w 15DX224   F51  C~1vYL      
2014 04  05.46957  14 21 03.399  +03 26 29.54  22.1w 15DX224   F51  C~1vYL      
2015 02  16.56248  14 30 03.670  +02 02 57.69  22.1w 15DX224   F51  C~1vYL      
2015 02  16.57589  14 30 03.658  +02 02 58.14  22.1w 15DX224   F51  C~1vYL      
2015 02  16.58925  14 30 03.643  +02 02 58.39  22.1w 15DX224   F51  C~1vYL      
2015 02  16.60266  14 30 03.631  +02 02 58.64  22.5w 15DX224   F51  C~1vYL      
2015 03  22.50668  14 28 45.335  +02 19 54.97  22.3w 15DX224   F51  C~1vYL      
2015 03  22.52031  14 28 45.299  +02 19 55.28  22.1w 15DX224   F51  C~1vYL      
2015 03  22.53407  14 28 45.230  +02 19 55.86  22.2w 15DX224   F51  C~1vYL      
2015 03  22.54779  14 28 45.179  +02 19 56.13  22.2w 15DX224   F51  C~1vYL      
2015 04  13.42982  14 27 10.211  +02 30 49.60  22.1w 15DX224   F51  C~1vYL      
2015 04  13.44414  14 27 10.127  +02 30 50.07  22.0w 15DX224   F51  C~1vYL      
2015 04  13.45869  14 27 10.065  +02 30 50.39  22.0w 15DX224   F51  C~1vYL      
2015 04  13.47326  14 27 09.980  +02 30 50.73  21.9w 15DX224   F51  C~1vYL      
2015 04  23.49707  14 26 20.402  +02 35 05.57  22.1w 15DX224   F51  C~1vYL      
2015 04  23.49774  14 26 20.396  +02 35 05.47  21.9w 15DX224   F51  C~1vYL      
2015 04  23.51133  14 26 20.323  +02 35 05.85  21.9w 15DX224   F51  C~1vYL      
2015 04  23.51199  14 26 20.315  +02 35 06.03  22.2w 15DX224   F51  C~1vYL      
2015 04  23.52553  14 26 20.251  +02 35 06.12  22.0w 15DX224   F51  C~1vYL      
2015 04  23.52618  14 26 20.251  +02 35 06.24  22.3w 15DX224   F51  C~1vYL      
2015 04  23.53979  14 26 20.171  +02 35 06.60  22.0w 15DX224   F51  C~1vYL      
2015 06  22.31962  14 22 03.031  +02 41 15.19  21.8i 15DX224   F51  C~1vYL      
2015 06  22.33286  14 22 02.995  +02 41 14.93  21.8i 15DX224   F51  C~1vYL      
2015 06  22.34610  14 22 02.965  +02 41 15.03  21.6i 15DX224   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    -0.13       0.00     0.21
  2   0.0000     -0.98    -0.05      -0.19    -0.07
  3   0.0001     -1.86     0.14      -0.14    -0.11
  4   0.0001     -3.03     0.05       0.07     0.01
  5   2.0177  13115.33     0.05   -2267.26    -0.01
  6   2.0177  13114.41     0.06   -2267.25    -0.03
  7   2.0178  13113.41    -0.00   -2267.18     0.01
  8   2.0178  13112.35    -0.13   -2267.13     0.02
  9   2.8860  22537.87     0.03   -4065.46    -0.04
 10   2.8860  22537.53    -0.03   -4065.10     0.05
 11   2.8860  22537.23    -0.06   -4064.95    -0.07
 12   2.8861  22536.97    -0.04   -4064.78    -0.17
 13   2.9789  21060.00    -0.06   -3532.08     0.04
 14   2.9789  21059.38     0.21   -3531.99     0.01
 15   2.9790  21058.20    -0.08   -3531.81     0.06
 16   2.9790  21057.38     0.00   -3531.83    -0.09
 17   3.0389  19479.09     0.04   -3429.74    -0.02
 18   3.0390  19477.74    -0.18   -3429.75    -0.01
 19   3.0390  19476.75    -0.01   -3429.78    -0.03
 20   3.0390  19475.43    -0.18   -3429.92    -0.16
 21   3.0665  18683.69     0.14   -3457.43     0.07
 22   3.0665  18683.64     0.14   -3457.55    -0.05
 23   3.0665  18682.48     0.07   -3457.59    -0.01
 24   3.0665  18682.30    -0.05   -3457.46     0.12
 25   3.0666  18681.36     0.11   -3457.72    -0.06
 26   3.0666  18681.32     0.12   -3457.61     0.05
 27   3.0666  18680.06    -0.04   -3457.70     0.04
 28   3.2303  14924.94    -0.05   -4490.99     0.04
 29   3.2303  14924.52    -0.03   -4491.43    -0.04
 30   3.2303  14924.06    -0.05   -4491.49     0.26

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.

15DX224    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        66.546    66.602    66.492
ecceobj         0.464     0.464     0.463
incobj         19.210    19.210    19.210
qmin           34.330    34.162    34.511
qmax          102.186   102.079   101.684
amean          67.099    67.053    67.167
amin           66.062    65.777    66.110
amax           68.583    68.577    68.538
emean           0.467     0.473     0.472
emin            0.449     0.455     0.456
emax            0.490     0.492     0.485
imean          17.482    16.975    16.909
imin           16.224    16.052    16.298
imax           18.719    18.121    18.109
excite_mean     0.556     0.556     0.554
fracstop        1.000     1.000     1.000
cjmean          2.966     2.964     2.968

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       202.0     196.8     188.3
kozaiamp        179.9     180.0     180.0