Orbit Fit and Astrometric record for 12BY154

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: 12BY154   
# Created Fri Dec 15 02:37:40 2017
# Orbit generated from Bernstein formalism
# Fitting   22 observations of   25
# Arc:   7.99y
# First observation: 2006/03/02
#  Last observation: 2014/02/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000699   0.031503   0.000097  -0.003141   0.025217   0.000000
# Chi-squared of fit:    14.67 DOF:   38 RMS:  0.14
# Min/Max residuals:    -0.39    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.776026E-05  3.011871E-02 -1.951563E-06 -3.014483E-03  2.777880E-02 -3.652057E-03
# Covariance matrix:
  4.8818E-13 -1.4047E-13 -4.6475E-15  7.3758E-15 -6.1803E-14 -3.1742E-13
 -1.4047E-13  1.9141E-13  1.0738E-14 -1.7158E-14 -2.4643E-13  7.4020E-13
 -4.6475E-15  1.0738E-14  4.4077E-13 -6.7627E-14 -1.2578E-14  4.4407E-14
  7.3758E-15 -1.7158E-14 -6.7627E-14  1.3375E-14  2.0566E-14 -7.0922E-14
 -6.1803E-14 -2.4643E-13 -1.2578E-14  2.0566E-14  1.8424E-12 -8.9429E-13
 -3.1742E-13  7.4020E-13  4.4407E-14 -7.0922E-14 -8.9429E-13  3.0590E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.355476  147.064727   -0.241642    0.072899   -0.955687  2453796.744684
# Heliocentric elements and errors
Epoch:              2453790.5000  =  2006/02/24
Mean Anomaly:          325.44255 +/-     0.034
Argument of Peri:      191.51622 +/-     0.048
Long of Asc Node:        3.80638 +/-     0.001
Inclination:             7.13187 +/-     0.000
Eccentricity:         0.17335138 +/-    0.0001
Semi-Major Axis:     42.51408702 +/-    0.0104
Time of Perihelion: 2463509.8420 +/-       8.9
Perihelion:          35.14421135 +/-    0.0100
Aphelion:            49.88396269 +/-    0.0132
Period (y)              277.2091 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.06576261 +/-    0.0015
Ecliptic Y           19.83083290 +/-    0.0010
Ecliptic Z            2.73382860 +/-    0.0001
Ecliptic XDOT        -0.00132837 +/-    0.0000
Ecliptic YDOT        -0.00268035 +/-    0.0000
Ecliptic ZDOT        -0.00032360 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.95696631 +/-    0.0013
Geocenter to KBO     35.99867752 +/-    0.0018
# Hcoef:  6.86

The following table shows the complete astrometric record for 12BY154. 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 (12BY154) followed by the observatory code and reference code for the source of the astrometry.

2006 03  02.24393  10 03 18.62   +16 34 40.9   21.7R 12BY154   695  C~1w3p      
2006 03  02.30137  10 03 18.34   +16 34 42.3         12BY154   695  C~1w3p      
2006 03  02.35617  10 03 18.01   +16 34 43.4         12BY154   695  C~1w3p      
2010 02  20.35237  10 30 08.442  +13 18 41.81  21.7r 12BY154   F51  C~1w3p      
2011 02  04.59242  10 37 58.509  +12 20 28.36  22.4r 12BY154   F51  C~1w3p      
2012 01  21.44598  10 45 28.167  +11 22 44.22  22.7w 12BY154   F51  C~1w3p      
2012 01  21.46008  10 45 28.102  +11 22 45.15  22.6w 12BY154   F51  C~1w3p      
2012 01  21.47418  10 45 28.094  +11 22 45.35  22.3w 12BY154   F51  C~1w3p      
2012 01  21.48834  10 45 28.013  +11 22 45.34  22.5w 12BY154   F51  C~1w3p      
2012 02  16.51560  10 43 27.151  +11 34 59.44  22.8w 12BY154   F51  C~1w3p      
2012 02  16.51919  10 43 27.109  +11 34 59.62  22.8w 12BY154   F51  C~1w3p      
2012 02  16.53024  10 43 27.075  +11 34 59.88  22.7w 12BY154   F51  C~1w3p      
2012 02  16.54486  10 43 26.995  +11 35 00.10  22.7w 12BY154   F51  C~1w3p      
2012 02  16.54853  10 43 26.974  +11 35 00.58  22.7w 12BY154   F51  C~1w3p      
2012 02  16.55958  10 43 26.915  +11 35 00.60  22.5w 12BY154   F51  C~1w3p      
2012 02  16.56323  10 43 26.886  +11 35 00.99  22.9w 12BY154   F51  C~1w3p      
2012 03  13.38620  10 41 10.451  +11 47 33.73  22.3r 12BY154   F51  C~1w3p      
2013 02  14.39267  10 50 02.222  +10 42 12.74  22.1w 12BY154   F51  C~1w3p      
2013 02  14.40728  10 50 02.142  +10 42 13.03  22.3w 12BY154   F51  C~1w3p      
2013 02  14.42187  10 50 02.062  +10 42 13.53  22.0w 12BY154   F51  C~1w3p      
2013 02  14.43656  10 50 01.992  +10 42 13.97  22.4w 12BY154   F51  C~1w3p      
2013 03  03.49815  10 48 32.259  +10 50 48.75  21.6i 12BY154   F51  C~1w3p      
2014 02  26.35320  10 55 29.886  +09 55 14.50  22.4w 12BY154   F51  C~1w3p      
2014 02  26.37701  10 55 29.723  +09 55 15.23  22.2w 12BY154   F51  C~1w3p      
2014 02  26.38893  10 55 29.689  +09 55 15.68  22.5w 12BY154   F51  C~1w3p      

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     0.05
  2   0.0002     -4.26     0.26      -0.09     0.18
  3   0.0003     -9.09    -0.14      -0.71    -0.22
  4   3.9729  26143.24 (   0.44)  -2502.76 (   0.97)
  5   4.9291  33995.59     0.09   -3135.40    -0.05
  6   5.8897  41675.15    -0.06   -3799.92     0.03
  7   5.8897  41673.85 (  -0.42)  -3799.43 (   0.52)
  8   5.8897  41673.66 (   0.32)  -3799.29 (   0.65)
  9   5.8898  41672.52     0.12   -3799.77     0.16
 10   5.9610  39675.18     0.09   -3811.21     0.01
 11   5.9611  39674.52    -0.27   -3811.28    -0.05
 12   5.9611  39673.93     0.11   -3811.24     0.02
 13   5.9611  39672.72     0.16   -3811.49    -0.20
 14   5.9611  39672.23    -0.02   -3811.16     0.14
 15   5.9612  39671.40     0.10   -3811.48    -0.16
 16   5.9612  39670.83    -0.15   -3811.29     0.05
 17   6.0319  37456.58     0.04   -3890.66     0.02
 18   6.9573  46555.63    -0.06   -4483.04     0.19
 19   6.9573  46554.37    -0.06   -4483.24     0.03
 20   6.9574  46553.02    -0.15   -4483.24     0.06
 21   6.9574  46551.85    -0.06   -4483.24     0.09
 22   7.0041  45063.47    -0.07   -4526.52    -0.39
 23   7.9893  52434.88     0.27   -5196.79     0.07
 24   7.9894  52432.21    -0.23   -5197.08    -0.14
 25   7.9894  52431.53     0.17   -5196.85     0.12

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.

12BY154    quality flag:3

Type:          5:3EE     5:3EE     5:3EE

axisobj        42.248    42.279    42.218
ecceobj         0.166     0.167     0.166
incobj          7.155     7.155     7.155
qmin           34.155    34.197    34.157
qmax           50.743    50.893    50.725
amean          42.328    42.328    42.328
amin           41.955    41.922    41.954
amax           42.745    42.772    42.743
emean           0.174     0.174     0.175
emin            0.158     0.158     0.158
emax            0.189     0.190     0.189
imean           7.216     7.177     7.226
imin            6.650     6.542     6.658
imax            7.906     7.929     7.900
excite_mean     0.215     0.215     0.215
fracstop        1.000     1.000     1.000
cjmean          3.027     3.028     3.027

libcent 0       180.1     180.4     180.6
libamp  0        31.7      51.9      18.4
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       177.4     172.4     177.3
kozaiamp        180.0     180.0     180.0