Orbit Fit and Astrometric record for 169071

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: 169071    
# Created Mon Oct 23 01:36:38 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   14 observations of   16
# Arc:   6.29y
# First observation: 2001/03/26
#  Last observation: 2007/07/12
# Chi-squared of fit:    70.01 DOF:   22 RMS:  0.40
# Min/Max residuals:    -0.55    1.09
# Exact a, adot, b, bdot, g, gdot:
  2.013134E-05  3.307445E-02  1.529440E-06  2.583940E-04  2.964514E-02 -4.855042E-03
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
   -5.781417 -157.654122    0.281508   -0.097057   -0.956913  2451994.874613
# Heliocentric elements and errors
Epoch:              2451994.5000  =  2001/03/26
Mean Anomaly:          315.37705 +/-     0.000
Argument of Peri:      336.93339 +/-     0.000
Long of Asc Node:      287.37138 +/-     0.000
Inclination:             5.63927 +/-     0.000
Eccentricity:         0.18788186 +/-    0.0000
Semi-Major Axis:     39.07830582 +/-    0.0000
Time of Perihelion: 2463054.5686 +/-       0.0
Perihelion:          31.73620087 +/-    0.0000
Aphelion:            46.42041077 +/-    0.0000
Period (y)              244.2934 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.03296887 +/-    0.0000
Ecliptic Y          -12.86042982 +/-    0.0000
Ecliptic Z           -3.39789865 +/-    0.0000
Ecliptic XDOT         0.00156337 +/-    0.0000
Ecliptic YDOT        -0.00265361 +/-    0.0000
Ecliptic ZDOT         0.00006910 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.68506521 +/-    0.0000
Geocenter to KBO     33.73245435 +/-    0.0000
# Hcoef:  7.99

The following table shows the complete astrometric record for 169071. 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 (169071) followed by the observatory code and reference code for the source of the astrometry.

2001 03  26.37387  13 13 47.70   -14 03 24.9   24.5R 169071    695  Cd1722      
2001 03  26.45371  13 13 47.27   -14 03 22.5         169071    695  Cd1722      
2001 04  29.33189  13 10 44.78   -13 45 08.2   22.7R 169071    695  Cd1722      
2001 04  29.37843  13 10 44.50   -13 45 06.2         169071    695  Cd1722      
2001 05  22.04014  13 09 03.01   -13 32 53.3   23.1R 169071    807  Cd1722      
2001 05  22.15008  13 09 02.61   -13 32 50.4         169071    807  Cd1722      
2002 04  06.17600  13 20 08.96   -14 40 16.8   21.8R 169071    807  Cf4616      
2002 04  06.31099  13 20 08.22   -14 40 13.2         169071    807  Cf4616      
2002 04  07.20541  13 20 03.29   -14 39 45.2         169071    807  Cf4616      
2003 04  29.41468  13 25 27.89   -15 09 37.0   23.0R 169071    568  Ch9859      
2003 04  29.44264  13 25 27.77   -15 09 36.0         169071    568  Ch9859      
2003 04  30.45411  13 25 22.38   -15 09 01.9         169071    568  Ch9859      
2007 07  11.97477  13 52 09.95   -17 20 28.3         169071    304  Cv1971      
2007 07  12.06139  13 52 09.96   -17 20 27.1         169071    304  Cv1971      
2016 06  08.19565  15 09 33.744  -22 40 03.92  22.8R 169071    G37              
2016 06  08.23071  15 09 33.546  -22 40 02.93        169071    G37              

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    -0.23       0.00     1.09
  2   0.0002      0.00    -0.55       0.00     0.04
  3   0.0930      0.00     0.61       0.00    -0.47
  4   0.0931      0.00     0.01       0.00    -0.06
  5   0.1551      0.00    -0.24       0.00     0.11
  6   0.1554      0.00     0.06       0.00    -0.26
  7   1.0289      0.00     0.54       0.00     0.27
  8   1.0293      0.00     0.79       0.00    -0.30
  9   1.0317      0.00     0.68       0.00    -0.03
 10   2.0918      0.00    -0.44       0.00     0.19
 11   2.0919      0.00     0.04       0.00     0.25
 12   2.0947      0.00    -0.20       0.00     0.29
 13   6.2932      0.00    -0.16       0.00    -0.26
 14   6.2935      0.00     0.12       0.00    -0.02
 15  15.2028      0.00 ( -18.30)      0.00 (   5.12)
 16  15.2029      0.00 ( -18.41)      0.00 (   5.20)

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.

169071    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        38.999    38.999    38.999
ecceobj         0.188     0.188     0.188
incobj          5.639     5.639     5.639
qmin           30.847    30.845    30.871
qmax           48.610    48.607    48.661
amean          39.456    39.456    39.456
amin           38.980    38.987    38.977
amax           40.017    40.019    40.013
emean           0.199     0.199     0.199
emin            0.180     0.180     0.181
emax            0.217     0.217     0.218
imean           7.451     7.451     7.451
imin            6.801     6.802     6.800
imax            8.124     8.123     8.125
excite_mean     0.237     0.237     0.237
fracstop        1.000     1.000     1.000
cjmean          2.987     2.987     2.987

libcent 0       179.4     179.8     179.6
libamp  0        99.1      98.8      98.6
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       185.7     185.7     185.5
kozaiamp        180.0     180.0     180.0