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 Mon Jul 23 01:37:56 2018
# Orbit generated from Bernstein formalism
# Fitting   32 observations of   34
# Arc:   8.96y
# First observation: 2005/03/12
#  Last observation: 2014/02/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000530   0.031555   0.000077  -0.003059   0.025894   0.000000
# Chi-squared of fit:    35.29 DOF:   58 RMS:  0.19
# Min/Max residuals:    -0.50    0.48
# Exact a, adot, b, bdot, g, gdot:
  1.733262E-05  2.984509E-02 -1.713745E-06 -2.911152E-03  2.763165E-02 -3.878635E-03
# Covariance matrix:
  1.8974E-13 -5.7008E-14 -3.4359E-15  3.9225E-15 -9.7496E-14 -1.4780E-13
 -5.7008E-14  1.3153E-13  5.0891E-15 -1.1677E-14 -5.4499E-14  4.7731E-13
 -3.4359E-15  5.0891E-15  1.3461E-13 -1.8767E-14  2.7758E-15  1.9137E-14
  3.9225E-15 -1.1677E-14 -1.8767E-14  4.7278E-15  3.9676E-15 -4.3613E-14
 -9.7496E-14 -5.4499E-14  2.7758E-15  3.9676E-15  3.2071E-13 -1.9490E-13
 -1.4780E-13  4.7731E-13  1.9137E-14 -4.3613E-14 -1.9490E-13  1.7818E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.512964  145.121756   -0.441424    0.069781   -0.882869  2453441.719003
# Heliocentric elements and errors
Epoch:              2453440.5000  =  2005/03/11
Mean Anomaly:          324.69331 +/-     0.017
Argument of Peri:      190.92107 +/-     0.025
Long of Asc Node:        3.82283 +/-     0.000
Inclination:             7.12924 +/-     0.000
Eccentricity:         0.17402607 +/-    0.0000
Semi-Major Axis:     42.58998741 +/-    0.0045
Time of Perihelion: 2463397.1727 +/-       4.6
Perihelion:          35.17821912 +/-    0.0042
Aphelion:            50.00175570 +/-    0.0056
Period (y)              277.9518 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -30.58106136 +/-    0.0006
Ecliptic Y           20.77432673 +/-    0.0004
Ecliptic Z            2.84757818 +/-    0.0001
Ecliptic XDOT        -0.00139523 +/-    0.0000
Ecliptic YDOT        -0.00263921 +/-    0.0000
Ecliptic ZDOT        -0.00031773 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.07941027 +/-    0.0006
Geocenter to KBO     36.19038869 +/-    0.0007
# Hcoef:  6.80

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.

2005 03  12.218260 09 55 56.01   +17 23 40.2   22.3V 12BY154   645  C~2VVH      
2005 03  12.218675 09 55 56.01   +17 23 40.1   22.3V 12BY154   645  C~2VVH      
2005 03  12.219089 09 55 56.01   +17 23 40.4   22.2V 12BY154   645  C~2VVH      
2005 03  12.219504 09 55 56.01   +17 23 40.3   22.1V 12BY154   645  C~2VVH      
2005 03  12.221577 09 55 56.00   +17 23 40.1   22.9V 12BY154   645  C~2VVH      
2005 03  12.221992 09 55 56.01   +17 23 40.0   22.9V 12BY154   645  C~2VVH      
2005 11  12.507423 10 08 37.94   +16 01 02.4   22.4V 12BY154   645  C~2VVH      
2005 11  12.508252 10 08 37.94   +16 01 02.4   22.1V 12BY154   645  C~2VVH      
2005 11  12.510740 10 08 37.93   +16 01 01.9   22.8V 12BY154   645  C~2VVH      
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    -0.05       0.00     0.01
  2   0.0000      0.03     0.01      -0.09    -0.08
  3   0.0000     -0.07    -0.06       0.19     0.20
  4   0.0000     -0.03     0.00       0.09     0.11
  5   0.0000     -0.10     0.09      -0.14    -0.12
  6   0.0000      0.07     0.29      -0.19    -0.16
  7   0.6716  12002.19     0.15    -819.76     0.28
  8   0.6716  12002.19     0.13    -819.76     0.27
  9   0.6716  12002.23     0.10    -820.28    -0.26
 10   0.9720   6977.17    -0.37    -557.97    -0.04
 11   0.9722   6972.91     0.02    -558.07     0.10
 12   0.9723   6968.07    -0.39    -558.71    -0.31
 13   4.9449  33270.61 (   0.53)  -3005.35 (   0.91)
 14   5.9011  41212.32     0.11   -3624.77    -0.10
 15   6.8617  48999.46    -0.13   -4278.27    -0.01
 16   6.8617  48998.14    -0.50   -4277.77     0.48
 17   6.8618  48997.94 (   0.25)  -4277.63 (   0.62)
 18   6.8618  48996.79     0.04   -4278.11     0.13
 19   6.9331  46970.15     0.15   -4293.59    -0.02
 20   6.9331  46969.48    -0.20   -4293.67    -0.09
 21   6.9331  46968.89     0.17   -4293.62    -0.02
 22   6.9331  46967.66     0.22   -4293.88    -0.24
 23   6.9331  46967.16     0.05   -4293.55     0.10
 24   6.9332  46966.32     0.17   -4293.88    -0.20
 25   6.9332  46965.74    -0.09   -4293.68     0.01
 26   7.0039  44720.79     0.26   -4377.98    -0.01
 27   7.9293  53959.53    -0.06   -4957.43     0.18
 28   7.9293  53958.25    -0.06   -4957.63     0.01
 29   7.9294  53956.88    -0.15   -4957.64     0.04
 30   7.9294  53955.68    -0.06   -4957.64     0.07
 31   7.9761  52443.01     0.03   -5004.06    -0.41
 32   8.9614  59945.03     0.25   -5666.87     0.08
 33   8.9614  59942.32    -0.26   -5667.16    -0.14
 34   8.9615  59941.63     0.14   -5666.94     0.13

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        42.240    42.253    42.227
ecceobj         0.166     0.166     0.166
incobj          7.155     7.155     7.155
qmin           34.168    34.135    34.161
qmax           50.704    50.752    50.712
amean          42.328    42.328    42.328
amin           41.950    41.931    41.955
amax           42.756    42.734    42.734
emean           0.174     0.174     0.175
emin            0.157     0.157     0.158
emax            0.189     0.189     0.189
imean           7.221     7.212     7.226
imin            6.653     6.639     6.657
imax            7.903     7.908     7.901
excite_mean     0.215     0.215     0.215
fracstop        1.000     1.000     1.000
cjmean          3.027     3.027     3.027

libcent 0       180.4     180.8     180.4
libamp  0        25.6      35.2      18.3
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       177.5     177.3     177.4
kozaiamp        179.9     180.0     180.0