Orbit Fit and Astrometric record for 160091

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: 160091    
# Created Sun Oct 22 01:36:37 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   20 observations of   20
# Arc:   6.95y
# First observation: 2000/07/29
#  Last observation: 2007/07/12
# Chi-squared of fit:    66.31 DOF:   34 RMS:  0.32
# Min/Max residuals:    -1.09    0.64
# Exact a, adot, b, bdot, g, gdot:
  1.444003E-05  2.397536E-02 -5.941040E-07  8.068499E-04  2.417562E-02  2.455352E-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
    0.457402  -23.585302    0.512754    0.006830   -0.876243  2451754.813763
# Heliocentric elements and errors
Epoch:              2451754.5000  =  2000/07/29
Mean Anomaly:           47.75711 +/-     0.000
Argument of Peri:      315.18929 +/-     0.000
Long of Asc Node:      322.70109 +/-     0.000
Inclination:             1.98575 +/-     0.000
Eccentricity:         0.10866246 +/-    0.0000
Semi-Major Axis:     45.22405804 +/-    0.0000
Time of Perihelion: 2437018.2054 +/-       0.0
Perihelion:          40.30990058 +/-    0.0000
Aphelion:            50.13821549 +/-    0.0000
Period (y)              304.1323 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           38.51141661 +/-    0.0000
Ecliptic Y          -17.36558657 +/-    0.0000
Ecliptic Z            0.33017292 +/-    0.0000
Ecliptic XDOT         0.00133342 +/-    0.0000
Ecliptic YDOT         0.00238299 +/-    0.0000
Ecliptic ZDOT         0.00009374 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.24685854 +/-    0.0000
Geocenter to KBO     41.36394678 +/-    0.0000
# Hcoef:  6.79

The following table shows the complete astrometric record for 160091. 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 (160091) followed by the observatory code and reference code for the source of the astrometry.

2000 07  29.31302  22 32 00.04   -08 43 58.1   22.6R 160091    807  Cc0956      
2000 07  29.42109  22 31 59.62   -08 44 00.6         160091    807  Cc0956      
2000 08  25.18432  22 30 06.49   -08 54 46.2   23.0R 160091    807  Cc0956      
2000 08  25.24361  22 30 06.21   -08 54 48.1         160091    807  Cc0956      
2000 09  03.267104 22 29 25.57   -08 58 42.5         160091    645  C~1ILI      
2000 09  19.18728  22 28 16.58   -09 05 19.6   22.8R 160091    695  Cc2364      
2000 09  19.28280  22 28 16.18   -09 05 21.6         160091    695  Cc2364      
2001 08  21.18017  22 35 31.61   -08 19 52.9   21.8R 160091    807  Cg3073      
2001 08  21.25576  22 35 31.26   -08 19 54.7         160091    807  Cg3073      
2002 08  11.33940  22 41 18.14   -07 42 34.0   22.2R 160091    807  Cg3073      
2002 08  12.30468  22 41 14.14   -07 42 56.8         160091    807  Cg3073      
2002 08  12.38292  22 41 13.80   -07 42 58.6         160091    807  Cg3073      
2007 06  26.41628  23 07 54.35   -04 45 36.3   23.9R 160091    250  S~06He      
2007 06  26.42323  23 07 54.34   -04 45 36.3         160091    250  S~06He      
2007 06  26.48156  23 07 54.29   -04 45 36.5         160091    250  S~06He      
2007 06  26.48851  23 07 54.29   -04 45 36.5         160091    250  S~06He      
2007 07  11.32760  23 07 33.58   -04 47 24.6         160091    304  Cv1967      
2007 07  11.42412  23 07 33.38   -04 47 25.8         160091    304  Cv1967      
2007 07  12.23520  23 07 31.78   -04 47 34.8         160091    304  Cv1967      
2007 07  12.41740  23 07 31.40   -04 47 36.8         160091    304  Cv1967      

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    -0.47
  2   0.0003      0.00     0.13       0.00     0.13
  3   0.0736      0.00     0.27       0.00     0.15
  4   0.0737      0.00     0.14       0.00    -0.22
  5   0.0984      0.00    -0.57       0.00    -1.09
  6   0.1420      0.00     0.17       0.00     0.04
  7   0.1423      0.00     0.19       0.00     0.32
  8   1.0619      0.00     0.15       0.00    -0.03
  9   1.0621      0.00    -0.00       0.00     0.11
 10   2.0343      0.00    -0.05       0.00    -0.15
 11   2.0369      0.00    -0.01       0.00     0.35
 12   2.0372      0.00    -0.14       0.00     0.44
 13   6.9079      0.00    -0.25       0.00     0.08
 14   6.9079      0.00    -0.32       0.00     0.11
 15   6.9081      0.00    -0.36       0.00     0.11
 16   6.9081      0.00    -0.28       0.00     0.14
 17   6.9487      0.00     0.39       0.00    -0.09
 18   6.9490      0.00     0.35       0.00    -0.23
 19   6.9512      0.00     0.56       0.00    -0.19
 20   6.9517      0.00     0.64       0.00    -0.11

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.

160091    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.316    45.316    45.316
ecceobj         0.110     0.110     0.110
incobj          1.983     1.983     1.983
qmin           39.621    39.581    39.587
qmax           51.039    50.978    51.003
amean          45.160    45.158    45.157
amin           44.785    44.790    44.793
amax           45.561    45.553    45.566
emean           0.106     0.106     0.106
emin            0.091     0.091     0.091
emax            0.121     0.119     0.120
imean           3.486     3.486     3.486
imin            2.836     2.835     2.836
imax            4.006     3.995     3.996
excite_mean     0.122     0.122     0.122
fracstop        1.000     1.000     1.000
cjmean          3.097     3.097     3.097

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       176.7     176.8     176.6
kozaiamp        180.0     179.9     180.0