Orbit Fit and Astrometric record for 12UW177

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: 12UW177   
# Created Tue Oct 24 01:38:11 2017
# Orbit generated from Bernstein formalism
# Fitting   19 observations of   19
# Arc:   1.04y
# First observation: 2012/08/18
#  Last observation: 2013/09/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000551   0.043167   0.000131   0.053061   0.045135   0.000000
# Chi-squared of fit:    10.35 DOF:   32 RMS:  0.13
# Min/Max residuals:    -0.35    0.30
# Exact a, adot, b, bdot, g, gdot:
  1.455584E-05  4.194761E-02  1.799587E-05  5.271709E-02  4.533100E-02 -1.540324E-03
# Covariance matrix:
  2.4213E-13  6.1497E-14 -6.7231E-14  4.0905E-13  2.7682E-13  6.8908E-12
  6.1497E-14  3.0137E-12 -4.9593E-13  3.4312E-12  1.4802E-12  5.8954E-11
 -6.7231E-14 -4.9593E-13  2.5216E-13 -1.0112E-12 -3.3799E-13 -1.3413E-11
  4.0905E-13  3.4312E-12 -1.0112E-12  6.2824E-12  2.2695E-12  9.3691E-11
  2.7682E-13  1.4802E-12 -3.3799E-13  2.2695E-12  1.1024E-12  3.8825E-11
  6.8908E-12  5.8954E-11 -1.3413E-11  9.3691E-11  3.8825E-11  1.6120E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   16.012238   34.379006    0.943029    0.101044   -0.352128  2456158.009978
# Heliocentric elements and errors
Epoch:              2456150.5000  =  2012/08/11
Mean Anomaly:          351.65023 +/-     0.089
Argument of Peri:       34.33692 +/-     0.160
Long of Asc Node:       19.99193 +/-     0.000
Inclination:            53.83750 +/-     0.001
Eccentricity:         0.26356531 +/-    0.0001
Semi-Major Axis:     30.25614310 +/-    0.0023
Time of Perihelion: 2457560.4089 +/-      15.1
Perihelion:          22.28167339 +/-    0.0044
Aphelion:            38.23061281 +/-    0.0050
Period (y)              166.4288 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           18.33683362 +/-    0.0004
Ecliptic Y           11.40413862 +/-    0.0003
Ecliptic Z            6.08549167 +/-    0.0001
Ecliptic XDOT        -0.00223488 +/-    0.0000
Ecliptic YDOT         0.00154731 +/-    0.0000
Ecliptic ZDOT         0.00303488 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   22.43495161 +/-    0.0004
Geocenter to KBO     22.05995662 +/-    0.0005
# Hcoef: 11.38

The following table shows the complete astrometric record for 12UW177. 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 (12UW177) followed by the observatory code and reference code for the source of the astrometry.

2012 08  18.50920  01 44 18.579  +27 58 04.51        12UW177   568  C~1Cs0      
2012 08  18.54805  01 44 18.408  +27 58 06.59        12UW177   568  C~1Cs0      
2012 08  24.41397  01 43 49.021  +28 02 51.73  25.3r 12UW177   568  C~1Cs0      
2012 08  24.46174  01 43 48.738  +28 02 53.75  25.1r 12UW177   568  C~1Cs0      
2012 09  12.40702  01 41 36.009  +28 13 31.82        12UW177   568  C~1Cs0      
2012 09  14.44299  01 41 18.683  +28 14 13.77  24.8r 12UW177   568  C~1Cs0      
2012 10  19.36875  01 35 24.993  +28 13 16.09  24.8r 12UW177   568  C~1Cs0      
2012 10  19.41153  01 35 24.501  +28 13 15.20  24.9r 12UW177   568  C~1Cs0      
2012 10  20.36078  01 35 14.193  +28 12 54.75        12UW177   568  C~1Cs0      
2012 10  20.39925  01 35 13.761  +28 12 54.09  24.7r 12UW177   568  C~1Cs0      
2012 10  20.43815  01 35 13.348  +28 12 53.15  24.2r 12UW177   568  C~1Cs0      
2012 10  21.42228  01 35 02.614  +28 12 31.48  24.4r 12UW177   568  C~1Cs0      
2012 11  14.35891  01 30 53.952  +27 59 52.07        12UW177   568  C~1Cs0      
2013 01  14.22823  01 25 59.574  +27 25 52.26  24.5r 12UW177   568  C~1Cs0      
2013 01  14.24065  01 25 59.581  +27 25 51.98  24.7r 12UW177   568  C~1Cs0      
2013 02  03.30644  01 26 54.595  +27 24 52.38        12UW177   568  C~1Cs0      
2013 02  06.25798  01 27 08.887  +27 25 23.01  24.9r 12UW177   568  C~1Cs0      
2013 09  03.39524  01 48 02.91   +31 53 48.6   24.9r 12UW177   568  C~1Cs0      
2013 09  03.42442  01 48 02.69   +31 53 50.0   25.3r 12UW177   568  C~1Cs0      

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     0.02       0.00     0.08
  2   0.0001     -1.33     0.16       2.77     0.07
  3   0.0162   -256.43     0.28     412.27     0.14
  4   0.0163   -259.15     0.04     415.54     0.04
  5   0.0682  -1647.81     0.03    1665.13    -0.02
  6   0.0737  -1844.08    -0.13    1790.35    -0.12
  7   0.1694  -6186.43    -0.13    3528.67     0.01
  8   0.1695  -6192.78    -0.35    3530.38     0.10
  9   0.1721  -6326.40    -0.11    3564.57    -0.14
 10   0.1722  -6331.93    -0.12    3566.19     0.05
 11   0.1723  -6337.33     0.07    3567.45    -0.13
 12   0.1750  -6476.62    -0.07    3602.76     0.30
 13   0.2405  -9806.44     0.03    4200.12    -0.12
 14   0.4072 -14221.33     0.12    3903.42    -0.13
 15   0.4072 -14221.36     0.06    3903.13    -0.22
 16   0.4621 -13572.56     0.02    3550.61     0.01
 17   0.4702 -13385.26     0.14    3501.53    -0.10
 18   1.0428   7928.85     0.02   12098.32     0.01
 19   1.0429   7926.74    -0.04   12100.65     0.17

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.

12UW177    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        30.260    30.291    30.229
ecceobj         0.263     0.264     0.262
incobj         53.786    53.783    53.788
qmin           20.110    19.559    19.319
qmax           40.755    40.638    41.221
amean          29.928    30.108    30.112
amin           28.226    29.816    29.709
amax           30.920    30.455    30.782
emean           0.229     0.177     0.164
emin            0.080     0.064     0.013
emax            0.318     0.349     0.350
imean          54.157    54.557    54.637
imin           53.001    52.662    52.386
imax           55.378    55.453    55.634
excite_mean     0.846     0.837     0.837
fracstop        0.216     0.150     0.431
cjmean          2.144     2.138     2.134

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       142.7     116.7     185.5
kozaiamp         80.8      79.5     149.2