Orbit Fit and Astrometric record for 09UF156

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: 09UF156   
# Created Tue Dec 12 02:37:37 2017
# Orbit generated from Bernstein formalism
# Fitting   18 observations of   19
# Arc:   8.65y
# First observation: 2005/02/10
#  Last observation: 2013/10/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.001157   0.023438  -0.000004   0.000360   0.025675   0.000000
# Chi-squared of fit:   109.53 DOF:   30 RMS:  0.44
# Min/Max residuals:    -0.84    1.01
# Exact a, adot, b, bdot, g, gdot:
  1.480558E-05  2.239697E-02 -2.410816E-07  3.390504E-04  2.322492E-02 -8.915857E-04
# Covariance matrix:
  4.8198E-13 -1.4900E-13  1.4688E-15 -1.3166E-15 -7.2686E-14 -4.5914E-13
 -1.4900E-13  9.6301E-14 -1.9349E-15  5.5247E-16 -9.6625E-14  2.9685E-13
  1.4688E-15 -1.9349E-15  3.2922E-13 -5.4720E-14  4.8308E-15 -4.9440E-15
 -1.3166E-15  5.5247E-16 -5.4720E-14  1.1829E-14  2.0226E-15  3.8215E-15
 -7.2686E-14 -9.6625E-14  4.8308E-15  2.0226E-15  7.9498E-13  1.4537E-13
 -4.5914E-13  2.9685E-13 -4.9440E-15  3.8215E-15  1.4537E-13  1.3865E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.934881   26.688047   -0.893677    0.006814    0.410610  2453411.741833
# Heliocentric elements and errors
Epoch:              2453410.5000  =  2005/02/09
Mean Anomaly:          276.47865 +/-     0.341
Argument of Peri:       39.09652 +/-     0.362
Long of Asc Node:       74.61566 +/-     0.008
Inclination:             1.29621 +/-     0.000
Eccentricity:         0.02023810 +/-    0.0001
Semi-Major Axis:     42.73246075 +/-    0.0071
Time of Perihelion: 2477082.2446 +/-      96.5
Perihelion:          41.86763702 +/-    0.0073
Aphelion:            43.59728449 +/-    0.0076
Period (y)              279.3477 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.69208133 +/-    0.0015
Ecliptic Y           19.95041852 +/-    0.0007
Ecliptic Z           -0.70253981 +/-    0.0000
Ecliptic XDOT        -0.00127931 +/-    0.0000
Ecliptic YDOT         0.00230488 +/-    0.0000
Ecliptic ZDOT         0.00004175 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.65214832 +/-    0.0013
Geocenter to KBO     43.05719169 +/-    0.0017
# Hcoef:  6.49

The following table shows the complete astrometric record for 09UF156. 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 (09UF156) followed by the observatory code and reference code for the source of the astrometry.

2005 02  10.24109  01 40 24.41   +09 25 10.1         09UF156   568  C~0j6a      
2005 02  10.24719  01 40 24.41   +09 25 10.1         09UF156   568  C~0j6a      
2005 02  10.25329  01 40 24.44   +09 25 10.3         09UF156   568  C~0j6a      
2008 10  29.408969 02 02 56.23   +11 32 58.3   22.4V 09UF156   645  C~1GH4      
2008 10  29.409799 02 02 56.23   +11 32 58.3   22.3V 09UF156   645  C~1GH4      
2008 10  29.412286 02 02 56.22   +11 32 58.2   23.3V 09UF156   645  C~1GH4      
2009 10  18.33904  02 08 54.11   +12 05 59.4   22.7r 09UF156   568  C~0j6a      
2009 10  18.44508  02 08 53.62   +12 05 56.8   22.6r 09UF156   568  C~0j6a      
2009 10  18.56664  02 08 53.05   +12 05 53.8   22.8r 09UF156   568  C~0j6a      
2009 11  21.20882  02 06 20.51   +11 52 44.2   22.6r 09UF156   568  C~0j6a      
2009 11  21.22573  02 06 20.47   +11 52 44.1   22.6r 09UF156   568  C~0j6a      
2009 11  21.50947  02 06 19.20   +11 52 40.1   22.6r 09UF156   568  C~0j6a      
2009 12  21.27743  02 04 41.74   +11 44 36.3   22.6r 09UF156   568  C~0j6a      
2009 12  21.38817  02 04 41.53   +11 44 34.5   22.8r 09UF156   568  C~0j6a      
2010 10  15.37300  02 14 15.89   +12 35 17.6         09UF156   675  C~0j6a      
2010 10  15.40463  02 14 15.74   +12 35 17.1         09UF156   675  C~0j6a      
2013 10  05.51338  02 30 27.16   +14 00 40.7   22.3R 09UF156   695  C~0zfo      
2013 10  06.35110  02 30 23.72   +14 00 23.7         09UF156   695  C~0zfo      
2013 10  06.47087  02 30 23.20   +14 00 21.0         09UF156   695  C~0zfo      

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     0.09       0.00     0.10
  2   0.0000      0.00    -0.19       0.00     0.09
  3   0.0000      0.49     0.01       0.03     0.10
  4   3.7157  21437.17     0.15     155.84    -0.80
  5   3.7157  21437.17     0.21     155.84    -0.80
  6   3.7157  21436.99     0.22     155.80    -0.84
  7   4.6847  27130.22    -0.18     227.25     0.95
  8   4.6850  27122.45    -0.11     227.24     0.86
  9   4.6854  27113.41    -0.15     227.24     0.81
 10   4.7775  24702.62    -0.19     244.56    -0.70
 11   4.7775  24702.03     0.33     244.66    -0.61
 12   4.7783  24682.87 (  -0.05)    247.27 (   1.63)
 13   4.8598  23152.41    -0.25     281.09     1.01
 14   4.8601  23148.85     0.15     280.44     0.18
 15   5.6759  32266.52    -0.11     299.45    -0.16
 16   5.6760  32264.23    -0.09     299.72     0.09
 17   8.6496  47915.59     0.06     524.44     0.04
 18   8.6519  47859.87     0.16     524.24    -0.06
 19   8.6522  47851.40    -0.12     524.08    -0.25

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.

09UF156    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.253    43.275    43.231
ecceobj         0.023     0.023     0.023
incobj          1.294     1.294     1.294
qmin           40.627    40.660    40.585
qmax           45.433    45.464    45.427
amean          42.940    42.961    42.918
amin           42.613    42.636    42.591
amax           43.280    43.300    43.256
emean           0.031     0.031     0.031
emin            0.010     0.010     0.010
emax            0.050     0.050     0.050
imean           1.099     1.086     1.112
imin            0.404     0.398     0.410
imax            1.563     1.550     1.576
excite_mean     0.037     0.037     0.037
fracstop        1.000     1.000     1.000
cjmean          3.087     3.088     3.087

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       177.2     176.6     178.8
kozaiamp        179.9     180.0     179.9