Orbit Fit and Astrometric record for 13EH154

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: 13EH154   
# Created Thu Oct 19 01:38:12 2017
# Orbit generated from Bernstein formalism
# Fitting   23 observations of   23
# Arc:   3.01y
# First observation: 2011/03/31
#  Last observation: 2014/04/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000185   0.041085   0.000002  -0.000047   0.033914   0.000000
# Chi-squared of fit:    18.47 DOF:   40 RMS:  0.16
# Min/Max residuals:    -0.31    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.836303E-05  3.998872E-02 -3.900289E-07 -3.570994E-05  3.449407E-02 -7.936076E-03
# Covariance matrix:
  1.7934E-13 -1.7238E-13 -2.8722E-17  1.2860E-16 -8.4158E-14 -9.2815E-13
 -1.7238E-13  7.6411E-13  1.7051E-16 -1.7607E-16 -3.5825E-13  6.0270E-12
 -2.8722E-17  1.7051E-16  1.5149E-13 -6.1611E-14 -5.1953E-17  1.4248E-15
  1.2860E-16 -1.7607E-16 -6.1611E-14  4.2469E-14 -1.2152E-15 -1.4988E-15
 -8.4158E-14 -3.5825E-13 -5.1953E-17 -1.2152E-15  1.9624E-12 -2.9532E-12
 -9.2815E-13  6.0270E-12  1.4248E-15 -1.4988E-15 -2.9532E-12  5.0337E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.443055  177.489808   -0.218584   -0.143739   -0.968172  2455651.857086
# Heliocentric elements and errors
Epoch:              2455650.5000  =  2011/03/30
Mean Anomaly:          297.36606 +/-     0.025
Argument of Peri:      354.91494 +/-     0.044
Long of Asc Node:      267.43061 +/-     0.002
Inclination:             8.16938 +/-     0.000
Eccentricity:         0.19517996 +/-    0.0002
Semi-Major Axis:     31.73135753 +/-    0.0053
Time of Perihelion: 2467009.4625 +/-       3.5
Perihelion:          25.53803250 +/-    0.0068
Aphelion:            37.92468255 +/-    0.0083
Period (y)              178.7480 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -29.63215879 +/-    0.0012
Ecliptic Y            1.07973312 +/-    0.0001
Ecliptic Z           -4.25656672 +/-    0.0002
Ecliptic XDOT         0.00048226 +/-    0.0000
Ecliptic YDOT        -0.00319225 +/-    0.0000
Ecliptic ZDOT         0.00008971 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   29.95578439 +/-    0.0012
Geocenter to KBO     28.99049130 +/-    0.0012
# Hcoef:  8.02

The following table shows the complete astrometric record for 13EH154. 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 (13EH154) followed by the observatory code and reference code for the source of the astrometry.

2011 03  31.35632  11 37 18.683  -06 44 47.64  23.2w 13EH154   F51  C~1w3t      
2011 03  31.35698  11 37 18.686  -06 44 47.69  23.0w 13EH154   F51  C~1w3t      
2011 03  31.37184  11 37 18.588  -06 44 47.18  23.1w 13EH154   F51  C~1w3t      
2011 03  31.37250  11 37 18.589  -06 44 47.02  22.8w 13EH154   F51  C~1w3t      
2011 03  31.38840  11 37 18.481  -06 44 46.53  22.9w 13EH154   F51  C~1w3t      
2011 03  31.38906  11 37 18.467  -06 44 46.15  23.0w 13EH154   F51  C~1w3t      
2011 03  31.40397  11 37 18.395  -06 44 45.57  23.3w 13EH154   F51  C~1w3t      
2011 03  31.40462  11 37 18.400  -06 44 45.46  23.1w 13EH154   F51  C~1w3t      
2012 03  02.45820  11 48 43.466  -07 58 03.22  22.1i 13EH154   F51  C~1w3t      
2012 03  20.39737  11 46 52.876  -07 47 02.69  22.7w 13EH154   F51  C~1w3t      
2012 03  20.41198  11 46 52.786  -07 47 02.15  22.4w 13EH154   F51  C~1w3t      
2013 03  04.51050  11 57 15.744  -08 52 17.85  21.6i 13EH154   F51  C~1w3t      
2013 03  04.52262  11 57 15.666  -08 52 17.04  21.7i 13EH154   F51  C~1w3t      
2013 03  06.46674  11 57 03.964  -08 51 12.77  22.0w 13EH154   F51  C~1w3t      
2013 04  05.34087  11 53 59.287  -08 31 29.53  22.3w 13EH154   F51  C~1w3t      
2013 04  05.35519  11 53 59.222  -08 31 28.89  22.5w 13EH154   F51  C~1w3t      
2013 04  05.36958  11 53 59.101  -08 31 27.99  22.5w 13EH154   F51  C~1w3t      
2014 03  25.09285  12 04 03.58   -09 35 13.5         13EH154   W84  C~2J9e      
2014 03  25.15778  12 04 03.16   -09 35 10.9   23.0V 13EH154   W84  C~2J9e      
2014 03  25.22235  12 04 02.75   -09 35 08.2         13EH154   W84  C~2J9e      
2014 04  05.38629  12 02 53.311  -09 27 16.10  22.4w 13EH154   F51  C~1w3t      
2014 04  05.39752  12 02 53.254  -09 27 15.33  22.5w 13EH154   F51  C~1w3t      
2014 04  05.40875  12 02 53.174  -09 27 14.70  22.4w 13EH154   F51  C~1w3t      

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    -0.01       0.00     0.08
  2   0.0000      0.06     0.12      -0.03     0.05
  3   0.0000     -1.48     0.05      -0.14    -0.11
  4   0.0000     -1.53     0.07       0.01     0.04
  5   0.0001     -3.20    -0.03      -0.19    -0.20
  6   0.0001     -3.54    -0.31       0.08     0.06
  7   0.0001     -4.76    -0.04       0.18     0.12
  8   0.0001     -4.74     0.04       0.31     0.25
  9   0.9229  11105.54     0.26      13.81    -0.06
 10   0.9720   9330.69     0.01     -28.14    -0.17
 11   0.9721   9329.24     0.07     -28.17    -0.20
 12   1.9279  19420.62    -0.01      -2.04    -0.07
 13   1.9279  19419.22    -0.23      -1.74     0.29
 14   1.9332  19232.83    -0.15     -10.10     0.28
 15   2.0150  16227.75     0.00      10.42    -0.27
 16   2.0151  16226.60     0.29      10.63    -0.12
 17   2.0151  16224.58    -0.28      10.76    -0.06
 18   2.9835  26065.54     0.07     -39.56    -0.10
 19   2.9837  26058.70     0.04     -39.55    -0.16
 20   2.9839  26051.95     0.08     -39.39    -0.08
 21   3.0145  24904.88     0.00       0.78    -0.09
 22   3.0145  24903.79     0.07       1.17     0.24
 23   3.0145  24902.44    -0.13       1.29     0.32

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.

13EH154    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        31.739    31.754    31.724
ecceobj         0.194     0.194     0.194
incobj          8.164     8.164     8.164
qmin           22.712    24.758    24.863
qmax           39.119    42.940    39.321
amean          30.637    33.333    31.821
amin           29.302    31.100    30.399
amax           33.066    35.472    33.257
emean           0.133     0.190     0.163
emin            0.005     0.094     0.072
emax            0.256     0.240     0.217
imean          11.743    10.902    11.303
imin            4.994     6.807     8.865
imax           15.530    13.768    14.546
excite_mean     0.254     0.271     0.260
fracstop        0.581     0.181     0.197
cjmean          2.935     2.931     2.933

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       163.2     163.5     157.2
kozaiamp        180.0     180.0     179.9