Orbit Fit and Astrometric record for 12EE18

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: 12EE18    
# Created Sat Oct 21 01:38:09 2017
# Orbit generated from Bernstein formalism
# Fitting   15 observations of   16
# Arc:   3.02y
# First observation: 2011/04/03
#  Last observation: 2014/04/10
Preliminary a, adot, b, bdot, g, gdot:
  -0.000283   0.030813  -0.000034   0.006456   0.025465   0.000000
# Chi-squared of fit:     5.02 DOF:   24 RMS:  0.10
# Min/Max residuals:    -0.16    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.829845E-05  3.051163E-02  2.828437E-06  6.387894E-03  2.617983E-02 -3.958195E-03
# Covariance matrix:
  6.3921E-13 -7.7737E-13  6.8748E-14 -1.3210E-13 -4.0883E-13 -6.1884E-12
 -7.7737E-13  1.4974E-12 -1.5441E-13  2.9460E-13  1.1634E-12  1.3918E-11
  6.8748E-14 -1.5441E-13  3.6348E-13 -1.8621E-13 -1.2740E-13 -1.5322E-12
 -1.3210E-13  2.9460E-13 -1.8621E-13  1.5669E-13  2.3651E-13  2.9233E-12
 -4.0883E-13  1.1634E-12 -1.2740E-13  2.3651E-13  1.7238E-12  1.1541E-11
 -6.1884E-12  1.3918E-11 -1.5322E-12  2.9233E-12  1.1541E-11  1.3811E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -11.591591 -159.348851    0.132250   -0.199959   -0.974678  2455654.907556
# Heliocentric elements and errors
Epoch:              2455650.5000  =  2011/03/30
Mean Anomaly:          351.32053 +/-     0.021
Argument of Peri:      340.15198 +/-     0.062
Long of Asc Node:      243.50229 +/-     0.001
Inclination:            16.31711 +/-     0.000
Eccentricity:         0.43997540 +/-    0.0003
Semi-Major Axis:     68.03710607 +/-    0.0310
Time of Perihelion: 2460592.5585 +/-      11.8
Perihelion:          38.10245295 +/-    0.0267
Aphelion:            97.97175919 +/-    0.0490
Period (y)              561.2120 +/-      0.38
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.98739395 +/-    0.0018
Ecliptic Y          -13.42454593 +/-    0.0007
Ecliptic Z           -7.67502589 +/-    0.0004
Ecliptic XDOT         0.00137754 +/-    0.0000
Ecliptic YDOT        -0.00288418 +/-    0.0000
Ecliptic ZDOT         0.00073761 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.16908193 +/-    0.0016
Geocenter to KBO     38.19734830 +/-    0.0019
# Hcoef:  6.56

The following table shows the complete astrometric record for 12EE18. 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 (12EE18) followed by the observatory code and reference code for the source of the astrometry.

2011 04  03.40679  12 57 59.776  -18 46 14.01  21.7i 12EE18    F51  C~1w3q      
2011 04  03.41821  12 57 59.706  -18 46 13.84  22.0i 12EE18    F51  C~1w3q      
2012 03  14.50069  13 06 54.257  -19 14 43.63  21.9i 12EE18    F51  C~1w3q      
2012 03  14.51258  13 06 54.188  -19 14 43.23  21.7i 12EE18    F51  C~1w3q      
2012 04  24.35374  13 03 42.084  -18 54 50.37  22.2w 12EE18    F51  C~1w3q      
2012 04  24.36851  13 03 42.014  -18 54 50.06  22.5w 12EE18    F51  C~1w3q      
2012 04  24.38324  13 03 41.957  -18 54 49.50  22.0w 12EE18    F51  C~1w3q      
2012 04  24.39805  13 03 41.902  -18 54 49.00  22.1w 12EE18    F51  C~1w3q      
2013 05  04.35105  13 10 28.596  -19 08 49.97  22.1w 12EE18    F51  C~1w3q      
2013 05  04.36738  13 10 28.512  -19 08 49.42  22.0w 12EE18    F51  C~1w3q      
2013 05  04.38372  13 10 28.443  -19 08 48.62  22.1w 12EE18    F51  C~1w3q      
2013 05  04.40007  13 10 28.428  -19 08 47.94  22.0w 12EE18    F51  C~1w3q      
2014 01  18.62683  13 23 51.384  -19 52 45.17  21.7i 12EE18    F51  C~1w3q      
2014 04  10.39494  13 19 58.082  -19 41 14.57  21.4i 12EE18    F51  C~1w3q      
2014 04  10.41879  13 19 57.952  -19 41 13.99  21.3i 12EE18    F51  C~1w3q      
2014 04  10.43070  13 19 57.902  -19 41 13.56  21.7i 12EE18    F51  C~1w3q      

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     0.03       0.00     0.21
  2   0.0000     -0.98    -0.09      -0.23    -0.03
  3   0.9476   7654.11     0.18    1360.39    -0.05
  4   0.9476   7653.05    -0.10    1360.39     0.00
  5   1.0594   4677.78    -0.16    1417.10     0.05
  6   1.0594   4676.74    -0.10    1417.00    -0.15
  7   1.0595   4675.78     0.04    1417.20    -0.05
  8   1.0595   4674.87     0.24    1417.36     0.00
  9   2.0861  10335.28     0.10    2840.97    -0.06
 10   2.0861  10333.96    -0.05    2841.03    -0.16
 11   2.0862  10332.75    -0.09    2841.40     0.05
 12   2.0862  10332.30 (   0.62)   2841.95 (   0.44)
 13   2.7959  21935.59    -0.05    4578.45     0.05
 14   3.0198  18582.10     0.04    4026.74     0.14
 15   3.0199  18580.16    -0.05    4026.61    -0.05
 16   3.0199  18579.34     0.05    4026.75     0.06

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.

12EE18    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        67.805    67.885    67.724
ecceobj         0.438     0.439     0.437
incobj         16.323    16.323    16.323
qmin           36.783    36.924    37.176
qmax          101.886   102.055   101.546
amean          68.490    68.676    68.460
amin           67.553    67.794    67.567
amax           69.734    69.866    69.692
emean           0.447     0.447     0.444
emin            0.432     0.433     0.433
emax            0.462     0.461     0.457
imean          17.042    17.226    17.342
imin           16.370    16.552    16.984
imax           17.846    17.876    17.758
excite_mean     0.534     0.536     0.535
fracstop        1.000     1.000     1.000
cjmean          3.019     3.019     3.019

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       161.1     164.6     187.8
kozaiamp        180.0     180.0     180.0