Orbit Fit and Astrometric record for 11SR250

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: 11SR250   
# Created Fri Dec 15 02:37:39 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   14 observations of   14
# Arc:  38.03d
# First observation: 2011/09/20
#  Last observation: 2011/10/28
# Chi-squared of fit:    55.66 DOF:   22 RMS:  0.35
# Min/Max residuals:    -1.74    0.26
# Exact a, adot, b, bdot, g, gdot:
  3.974897E-05  3.843768E-01  5.352238E-06  5.177715E-02  1.511731E-01  7.485709E-02
# Covariance matrix:
  1.4067E-12  1.1068E-08 -2.5746E-13  5.1863E-10  1.8326E-09 -4.7672E-08
  1.1068E-08  1.1949E-04 -2.7288E-09  5.5136E-06  1.9563E-05 -5.4226E-04
 -2.5746E-13 -2.7288E-09  3.1227E-13 -1.2862E-10 -4.4749E-10  1.2293E-08
  5.1863E-10  5.5136E-06 -1.2862E-10  2.5493E-07  9.0394E-07 -2.4870E-05
  1.8326E-09  1.9563E-05 -4.4749E-10  9.0394E-07  3.2062E-06 -8.8391E-05
 -4.7672E-08 -5.4226E-04  1.2293E-08 -2.4870E-05 -8.8391E-05  2.5111E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
    5.026930  -16.790488   -0.235246    0.085212   -0.969066  2455824.837246
# Heliocentric elements and errors
Epoch:              2455824.5000  =  2011/09/20
Mean Anomaly:           21.49072 +/-   298.832
Argument of Peri:      341.79055 +/-     2.780
Long of Asc Node:      315.57155 +/-     0.752
Inclination:             8.85763 +/-     0.143
Eccentricity:         0.37594038 +/-    0.1481
Semi-Major Axis:     11.06748994 +/-   22.9043
Time of Perihelion: 2455021.6757 +/-   11438.2
Perihelion:           6.90677361 +/-   14.3874
Aphelion:            15.22820626 +/-   31.5576
Period (y)               36.8198 +/-    114.30
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            7.31155751 +/-    0.0615
Ecliptic Y           -1.95825388 +/-    0.0185
Ecliptic Z            0.57968461 +/-    0.0056
Ecliptic XDOT         0.00322186 +/-    0.0007
Ecliptic YDOT         0.00630345 +/-    0.0003
Ecliptic ZDOT         0.00105297 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO    7.59136223 +/-    0.0594
Geocenter to KBO      6.61492441 +/-    0.0644
# Hcoef: 12.61

The following table shows the complete astrometric record for 11SR250. 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 (11SR250) followed by the observatory code and reference code for the source of the astrometry.

2011 09  20.33648  22 50 23.944  -01 57 09.14  22.0w 11SR250   F51  C~0a05      
2011 09  20.35158  22 50 23.642  -01 57 10.71  21.8w 11SR250   F51  C~0a05      
2011 09  20.36677  22 50 23.352  -01 57 12.19  21.7w 11SR250   F51  C~0a05      
2011 09  20.38199  22 50 23.048  -01 57 13.71  22.0w 11SR250   F51  C~0a05      
2011 09  21.515122 22 50 01.668  -01 59 04.55  20.7R 11SR250   568  C~0a05      
2011 09  21.570922 22 50 00.609  -01 59 09.84  20.5R 11SR250   568  C~0a05      
2011 10  28.231113 22 42 06.533  -02 45 43.11  21.2R 11SR250   568  C~0a05      
2011 10  28.237070 22 42 06.500  -02 45 43.33  21.2R 11SR250   568  C~0a05      
2011 10  28.238320 22 42 06.494  -02 45 43.40  21.2R 11SR250   568  C~0a05      
2011 10  28.239575 22 42 06.484  -02 45 43.48  21.1R 11SR250   568  C~0a05      
2011 10  28.290906 22 42 06.179  -02 45 45.69  21.2R 11SR250   568  C~0a05      
2011 10  28.366672 22 42 05.728  -02 45 48.78  21.0R 11SR250   568  C~0a05      
2011 10  28.367921 22 42 05.716  -02 45 48.84  21.1R 11SR250   568  C~0a05      
2011 10  28.369174 22 42 05.717  -02 45 48.91  21.2R 11SR250   568  C~0a05      

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    -0.24       0.00    -1.74
  2   0.0000      0.00     0.18       0.00     0.03
  3   0.0001      0.00     0.26       0.00     0.04
  4   0.0001      0.00     0.13       0.00     0.02
  5   0.0032      0.00     0.20       0.00     0.02
  6   0.0034      0.00     0.20       0.00     0.17
  7   0.1037      0.00     0.03       0.00     0.02
  8   0.1038      0.00     0.07       0.00     0.06
  9   0.1038      0.00     0.10       0.00     0.04
 10   0.1038      0.00     0.06       0.00     0.01
 11   0.1039      0.00     0.09       0.00    -0.03
 12   0.1041      0.00     0.05       0.00     0.05
 13   0.1041      0.00    -0.02       0.00     0.04
 14   0.1041      0.00     0.10       0.00     0.02

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.

11SR250    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        10.821    10.821    10.821
ecceobj         0.362     0.362     0.362
incobj          8.843     8.843     8.843
qmin            6.903     6.903     6.903
qmax           16.589    15.262    14.930
amean          11.220    10.995    10.852
amin           10.641    10.626    10.550
amax           12.097    11.437    11.282
emean           0.354     0.329     0.275
emin            0.332     0.300     0.166
emax            0.384     0.362     0.362
imean          11.697    12.432    16.203
imin           10.039    10.044    10.033
imax           14.084    15.973    21.856
excite_mean     0.409     0.395     0.404
fracstop        0.001     0.002     0.002
cjmean          3.807     3.854     3.878

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        68.1      63.3      43.7
kozaiamp        167.7     167.8     167.6