Orbit Fit and Astrometric record for 91133

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: 91133     
# Created Sat Oct 21 01:36:27 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   31 observations of   31
# Arc:   3.22y
# First observation: 1998/04/28
#  Last observation: 2001/07/19
# Chi-squared of fit:    16.45 DOF:   56 RMS:  0.13
# Min/Max residuals:    -0.30    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.906991E-05  4.277997E-02 -1.837966E-06 -4.452724E-03  3.402424E-02  1.370325E-04
# 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
    0.043944 -129.754927    0.220961    0.000521   -0.987433  2450931.999271
# Heliocentric elements and errors
Epoch:              2450932.5000  =  1998/04/29
Mean Anomaly:          358.84794 +/-     0.000
Argument of Peri:      181.47034 +/-     0.000
Long of Asc Node:       50.25181 +/-     0.000
Inclination:             5.95050 +/-     0.000
Eccentricity:         0.22680477 +/-    0.0000
Semi-Major Axis:     39.28197347 +/-    0.0000
Time of Perihelion: 2451220.2814 +/-       0.0
Perihelion:          30.37263461 +/-    0.0000
Aphelion:            48.19131232 +/-    0.0000
Period (y)              246.2057 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -19.58822849 +/-    0.0000
Ecliptic Y          -23.21597204 +/-    0.0000
Ecliptic Z            0.02251488 +/-    0.0000
Ecliptic XDOT         0.00264120 +/-    0.0000
Ecliptic YDOT        -0.00220139 +/-    0.0000
Ecliptic ZDOT        -0.00035838 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   30.37566091 +/-    0.0000
Geocenter to KBO     29.39084007 +/-    0.0000
# Hcoef:  7.62

The following table shows the complete astrometric record for 91133. 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 (91133) followed by the observatory code and reference code for the source of the astrometry.

1998 04  28.49854  15 11 15.66   -17 45 51.5   22.1R 91133     568  Ca4825      
1998 04  28.53791  15 11 15.40   -17 45 50.6   22.1R 91133     568  Ca4825      
1998 04  28.57687  15 11 15.15   -17 45 49.7   22.1R 91133     568  Ca4825      
1998 04  30.42507  15 11 03.47   -17 45 08.2   22.1R 91133     568  Ca4825      
1998 04  30.44055  15 11 03.37   -17 45 07.8   22.1R 91133     568  Ca4825      
1998 05  22.40111  15 08 42.13   -17 36 41.6   22.1R 91133     568  Ca4825      
1998 05  22.40926  15 08 42.08   -17 36 41.4   22.1R 91133     568  Ca4825      
1998 05  22.41742  15 08 42.01   -17 36 41.2   22.1R 91133     568  Ca4825      
1998 06  29.39329  15 05 23.52   -17 24 56.5   22.1R 91133     568  Ca4825      
1998 06  30.38951  15 05 19.92   -17 24 44.4   22.1R 91133     568  Ca4825      
1998 07  01.43602  15 05 16.25   -17 24 32.0   22.1R 91133     568  Ca4825      
1999 03  13.59082  15 24 28.79   -18 49 53.5   21.8R 91133     568  Ca4825      
1999 03  14.58160  15 24 26.48   -18 49 47.8   21.8R 91133     568  Ca4825      
1999 04  08.56052  15 22 51.41   -18 45 09.8   21.8R 91133     568  Ca4825      
1999 04  08.58311  15 22 51.29   -18 45 09.3   21.8R 91133     568  Ca4825      
1999 05  22.31252  15 18 23.33   -18 30 23.4   22.1R 91133     697  Cb0746      
1999 05  22.35266  15 18 23.06   -18 30 22.3   22.0R 91133     697  Cb0746      
1999 05  23.30755  15 18 16.94   -18 30 01.6   21.6R 91133     697  Cb0746      
2000 04  07.62459  15 32 35.21   -19 35 40.9   22.3R 91133     568  Cb1843      
2000 04  07.62926  15 32 35.18   -19 35 41.0   22.3R 91133     568  Cb1843      
2000 04  07.63392  15 32 35.16   -19 35 40.9   22.5R 91133     568  Cb1843      
2000 04  07.63859  15 32 35.14   -19 35 40.8   22.5R 91133     568  Cb1843      
2000 04  30.58301  15 30 24.63   -19 29 13.7   22.1R 91133     568  Cb5090      
2000 04  30.60086  15 30 24.52   -19 29 13.3   22.1R 91133     568  Cb5090      
2000 05  01.54937  15 30 18.50   -19 28 55.0   22.2R 91133     568  Cb5090      
2000 05  01.56719  15 30 18.40   -19 28 54.3   22.1R 91133     568  Cb5091      
2000 05  01.59122  15 30 18.25   -19 28 54.0   22.1R 91133     568  Cb5091      
2000 05  07.49642  15 29 40.20   -19 26 56.2   22.3R 91133     568  Cb5091      
2000 05  07.53809  15 29 39.93   -19 26 55.5   22.4R 91133     568  Cb5091      
2001 07  18.38355  15 33 08.491  -19 57 02.33        91133     568  Cl5160      
2001 07  19.36575  15 33 06.214  -19 56 55.73        91133     568  Cl5160      

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    -0.10       0.00     0.30
  2   0.0001      0.00     0.12       0.00    -0.09
  3   0.0002      0.00     0.11       0.00    -0.08
  4   0.0053      0.00     0.13       0.00    -0.12
  5   0.0053      0.00     0.13       0.00    -0.07
  6   0.0654      0.00    -0.05       0.00     0.02
  7   0.0655      0.00    -0.01       0.00     0.04
  8   0.0655      0.00    -0.28       0.00     0.05
  9   0.1695      0.00    -0.00       0.00    -0.12
 10   0.1722      0.00     0.01       0.00    -0.17
 11   0.1751      0.00     0.07       0.00    -0.09
 12   0.8736      0.00     0.21       0.00    -0.04
 13   0.8763      0.00     0.25       0.00     0.05
 14   0.9447      0.00     0.11       0.00    -0.11
 15   0.9448      0.00     0.06       0.00     0.03
 16   1.0645      0.00     0.24       0.00     0.10
 17   1.0646      0.00     0.12       0.00     0.32
 18   1.0672      0.00     0.18       0.00     0.17
 19   1.9442      0.00     0.02       0.00     0.14
 20   1.9442      0.00    -0.08       0.00    -0.03
 21   1.9442      0.00    -0.03       0.00     0.00
 22   1.9443      0.00     0.02       0.00     0.04
 23   2.0071      0.00     0.01       0.00    -0.00
 24   2.0071      0.00     0.07       0.00     0.04
 25   2.0097      0.00    -0.12       0.00    -0.12
 26   2.0098      0.00     0.11       0.00     0.23
 27   2.0098      0.00     0.18       0.00     0.05
 28   2.0260      0.00     0.00       0.00    -0.02
 29   2.0261      0.00     0.09       0.00    -0.17
 30   3.2221      0.00     0.05       0.00    -0.12
 31   3.2248      0.00     0.18       0.00    -0.30

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.

91133    quality flag:3

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

axisobj        39.105    39.105    39.105
ecceobj         0.223     0.223     0.223
incobj          5.956     5.956     5.956
qmin           28.926    28.926    28.926
qmax           50.287    50.286    50.288
amean          39.455    39.455    39.455
amin           39.059    39.059    39.059
amax           39.923    39.923    39.923
emean           0.240     0.240     0.240
emin            0.212     0.212     0.212
emax            0.264     0.264     0.264
imean           4.474     4.474     4.474
imin            1.792     1.793     1.791
imax            7.195     7.195     7.195
excite_mean     0.254     0.254     0.254
fracstop        1.000     1.000     1.000
cjmean          2.978     2.978     2.978

libcent 0       179.8     179.8     179.8
libamp  0        49.5      49.5      49.5
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        88.5      88.6      88.5
kozaiamp         84.4      84.4      84.4