Orbit Fit and Astrometric record for 91205

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: 91205     
# Created Tue Dec 12 02:36:33 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   25 observations of   25
# Arc:  17.29y
# First observation: 1998/10/22
#  Last observation: 2016/02/04
# Chi-squared of fit:    77.94 DOF:   44 RMS:  0.31
# Min/Max residuals:    -0.69    0.65
# Exact a, adot, b, bdot, g, gdot:
  1.642065E-05  3.173019E-02 -4.080859E-06 -5.916801E-03  2.914951E-02  3.037404E-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
   -0.955718   49.382323    0.342668   -0.015689   -0.926938  2451108.907011
# Heliocentric elements and errors
Epoch:              2451108.5000  =  1998/10/22
Mean Anomaly:           33.18814 +/-     0.000
Argument of Peri:      141.79265 +/-     0.000
Long of Asc Node:      223.82695 +/-     0.000
Inclination:            10.58285 +/-     0.000
Eccentricity:         0.13845794 +/-    0.0000
Semi-Major Axis:     39.54954366 +/-    0.0000
Time of Perihelion: 2442733.3787 +/-       0.0
Perihelion:          34.07359514 +/-    0.0000
Aphelion:            45.02549219 +/-    0.0000
Period (y)              248.7256 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           23.20192516 +/-    0.0000
Ecliptic Y           26.51702515 +/-    0.0000
Ecliptic Z           -0.57234459 +/-    0.0000
Ecliptic XDOT        -0.00208281 +/-    0.0000
Ecliptic YDOT         0.00215874 +/-    0.0000
Ecliptic ZDOT        -0.00056045 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.23926624 +/-    0.0000
Geocenter to KBO     34.30586942 +/-    0.0000
# Hcoef:  8.15

The following table shows the complete astrometric record for 91205. 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 (91205) followed by the observatory code and reference code for the source of the astrometry.

1998 10  22.40628  03 08 48.43   +16 39 15.3   22.8R 91205     695  Ca3120      
1998 10  22.49369  03 08 47.93   +16 39 12.7         91205     695  Ca3120      
1998 11  18.13535  03 06 18.37   +16 27 28.1   22.6R 91205     695  Ca3120      
1998 11  18.20454  03 06 18.00   +16 27 26.2         91205     695  Ca3120      
1998 12  17.95527  03 03 45.48   +16 15 35.9         91205     950  Ca3601      
1998 12  18.00257  03 03 45.30   +16 15 35.6         91205     950  Ca3601      
1998 12  18.03799  03 03 45.12   +16 15 34.0         91205     950  Ca3601      
1999 10  06.55934  03 17 46.28   +16 54 48.2         91205     568  Ca6740      
1999 10  09.53349  03 17 33.50   +16 53 45.2         91205     568  Ca6740      
1999 10  09.57011  03 17 33.32   +16 53 44.2         91205     568  Ca6740      
1999 10  09.60427  03 17 33.15   +16 53 43.6   23.4R 91205     568  Ca6740      
1999 10  09.63619  03 17 33.05   +16 53 42.9   23.3R 91205     568  Ca6740      
2000 12  28.31163  03 18 17.672  +16 31 40.74  23.2R 91205     568  Cl4052      
2000 12  28.38018  03 18 17.407  +16 31 39.64  23.0R 91205     568  Cl4052      
2003 10  01.56099  03 48 19.49   +17 21 57.5   23.1R 91205     568  Ci6851      
2003 10  01.59893  03 48 19.38   +17 21 56.8         91205     568  Ci6851      
2003 12  21.158989 03 41 29.38   +16 54 27.3         91205     645  C~1RtE      
2003 12  21.159818 03 41 29.38   +16 54 27.2         91205     645  C~1RtE      
2003 12  21.162306 03 41 29.37   +16 54 27.2         91205     645  C~1RtE      
2008 11  02.74055  04 22 51.07   +17 20 35.3   25.3R 91205     250  S~06GZ      
2008 11  02.74749  04 22 51.04   +17 20 35.2         91205     250  S~06GZ      
2008 11  02.75374  04 22 51.00   +17 20 35.0         91205     250  S~06GZ      
2008 11  02.76069  04 22 50.98   +17 20 35.0         91205     250  S~06GZ      
2016 02  04.18230  05 04 56.12   +16 42 53.9   23.6R 91205     G37  C~1mS8      
2016 02  04.31003  05 04 55.81   +16 42 54.2         91205     G37  C~1mS8      

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    -0.11       0.00     0.10
  2   0.0002      0.00    -0.30       0.00    -0.13
  3   0.0732      0.00    -0.48       0.00     0.54
  4   0.0734      0.00    -0.05       0.00     0.46
  5   0.1548      0.00    -0.25       0.00    -0.08
  6   0.1550      0.00     0.15       0.00     0.57
  7   0.1550      0.00    -0.25       0.00    -0.32
  8   0.9559      0.00     0.19       0.00    -0.41
  9   0.9641      0.00     0.44       0.00     0.11
 10   0.9642      0.00     0.23       0.00    -0.09
 11   0.9643      0.00    -0.01       0.00     0.06
 12   0.9644      0.00     0.65       0.00     0.07
 13   2.1845      0.00     0.07       0.00     0.27
 14   2.1847      0.00    -0.01       0.00     0.22
 15   4.9422      0.00    -0.31       0.00     0.01
 16   4.9423      0.00    -0.10       0.00    -0.05
 17   5.1629      0.00     0.33       0.00    -0.60
 18   5.1629      0.00     0.39       0.00    -0.69
 19   5.1629      0.00     0.42       0.00    -0.65
 20  10.0324      0.00    -0.14       0.00     0.24
 21  10.0324      0.00    -0.07       0.00     0.27
 22  10.0324      0.00    -0.19       0.00     0.18
 23  10.0325      0.00     0.03       0.00     0.31
 24  17.2862      0.00    -0.06       0.00     0.21
 25  17.2865      0.00     0.40       0.00     0.18

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.

91205    quality flag:3

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

axisobj        39.625    39.625    39.625
ecceobj         0.139     0.139     0.139
incobj         10.572    10.572    10.572
qmin           33.540    33.540    33.541
qmax           45.927    45.958    45.960
amean          39.458    39.458    39.458
amin           38.996    39.008    39.008
amax           39.952    39.954    39.955
emean           0.130     0.131     0.130
emin            0.111     0.112     0.110
emax            0.150     0.151     0.151
imean          12.117    12.103    12.149
imin           11.357    11.357    11.357
imax           12.861    12.820    12.929
excite_mean     0.247     0.247     0.247
fracstop        1.000     1.000     1.000
cjmean          2.982     2.982     2.982

libcent 0       179.0     179.8     177.5
libamp  0       104.1     103.3     105.7
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       178.2     177.7     179.6
kozaiamp        180.0     180.0     180.0