Orbit Fit and Astrometric record for 181855

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: 181855    
# Created Sat Oct 21 01:36:38 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   29 observations of   29
# Arc:  10.00y
# First observation: 1998/11/18
#  Last observation: 2008/11/16
# Chi-squared of fit:    67.95 DOF:   52 RMS:  0.27
# Min/Max residuals:    -0.77    0.67
# Exact a, adot, b, bdot, g, gdot:
  1.449337E-05  2.490876E-02  6.459748E-06  1.362443E-02  2.635916E-02 -2.952031E-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
    1.411798   43.810608   -0.207890    0.023465   -0.961997  2451135.620281
# Heliocentric elements and errors
Epoch:              2451136.5000  =  1998/11/19
Mean Anomaly:          334.57923 +/-     0.000
Argument of Peri:       39.80097 +/-     0.000
Long of Asc Node:       41.58299 +/-     0.000
Inclination:            28.61546 +/-     0.000
Eccentricity:         0.18640455 +/-    0.0000
Semi-Major Axis:     46.31233148 +/-    0.0000
Time of Perihelion: 2459265.3577 +/-       0.0
Perihelion:          37.67950198 +/-    0.0000
Aphelion:            54.94516097 +/-    0.0000
Period (y)              315.1760 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.92708201 +/-    0.0000
Ecliptic Y           27.07114129 +/-    0.0000
Ecliptic Z            0.93497266 +/-    0.0000
Ecliptic XDOT        -0.00203801 +/-    0.0000
Ecliptic YDOT         0.00163978 +/-    0.0000
Ecliptic ZDOT         0.00140712 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.90562517 +/-    0.0000
Geocenter to KBO     37.93756843 +/-    0.0000
# Hcoef:  7.57

The following table shows the complete astrometric record for 181855. 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 (181855) followed by the observatory code and reference code for the source of the astrometry.

1998 11  18.11955  02 43 38.73   +17 19 52.0   22.6R 181855    695   a3608      
1998 11  18.18843  02 43 38.36   +17 19 50.7         181855    695   a3608      
1998 11  18.27206  02 43 37.91   +17 19 49.2         181855    695   a3608      
1998 12  17.93517  02 41 18.13   +17 12 39.5   22.9R 181855    950   a3608      
1998 12  17.97547  02 41 17.97   +17 12 39.3         181855    950   a3608      
1998 12  18.01794  02 41 17.78   +17 12 38.4         181855    950   a3608      
1999 11  30.20597  02 47 23.35   +18 27 08.3   22.5R 181855    695  Cc3588      
1999 11  30.21307  02 47 23.31   +18 27 08.2         181855    695  Cc3588      
1999 11  30.33792  02 47 22.67   +18 27 06.2   22.3R 181855    695  Cc3588      
1999 11  30.34501  02 47 22.64   +18 27 06.2   22.3R 181855    695  Cc3588      
2000 12  21.32043  02 50 35.99   +19 32 23.3         181855    568  Cc3588      
2000 12  21.41583  02 50 35.65   +19 32 22.1         181855    568  Cc3588      
2000 12  22.29839  02 50 32.35   +19 32 11.7         181855    568  Cc3588      
2002 11  05.42689  03 04 33.87   +22 04 23.9   22.9R 181855    568  Cl8244      
2002 11  05.48447  03 04 33.55   +22 04 23.1         181855    568  Cl8244      
2002 11  06.49798  03 04 27.71   +22 04 08.6         181855    568  Cl8244      
2007 09  16.48930  03 35 22.18   +27 46 54.6         181855    675  Cy6664      
2007 09  17.42275  03 35 20.01   +27 47 06.2   23.8R 181855    675  Cy6664      
2007 09  17.50186  03 35 19.84   +27 47 07.6   23.9R 181855    675  Cy6664      
2008 03  03.12511  03 25 51.33   +27 27 24.8         181855    695  Cy7583      
2008 03  04.12070  03 25 54.39   +27 27 29.8         181855    695  Cy7583      
2008 03  05.11459  03 25 57.55   +27 27 34.8         181855    695  Cy7583      
2008 09  20.85310  03 40 55.52   +28 53 42.7   24.9R 181855    250  S~06I2      
2008 09  20.85935  03 40 55.52   +28 53 43.0         181855    250  S~06I2      
2008 09  20.87254  03 40 55.48   +28 53 43.1         181855    250  S~06I2      
2008 11  16.59471  03 36 15.56   +28 53 58.4         181855    250  S~06I2      
2008 11  16.60166  03 36 15.52   +28 53 58.3         181855    250  S~06I2      
2008 11  16.60791  03 36 15.48   +28 53 58.2         181855    250  S~06I2      
2008 11  16.61485  03 36 15.44   +28 53 58.1         181855    250  S~06I2      

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    -0.26       0.00    -0.46
  2   0.0002      0.00     0.10       0.00     0.21
  3   0.0004      0.00     0.19       0.00     0.10
  4   0.0816      0.00     0.24       0.00     0.04
  5   0.0817      0.00     0.19       0.00     0.29
  6   0.0819      0.00    -0.19       0.00    -0.13
  7   1.0324      0.00    -0.09       0.00    -0.21
  8   1.0324      0.00    -0.14       0.00    -0.20
  9   1.0328      0.00    -0.15       0.00    -0.23
 10   1.0328      0.00    -0.06       0.00    -0.12
 11   2.0923      0.00    -0.20       0.00     0.07
 12   2.0925      0.00     0.20       0.00     0.02
 13   2.0949      0.00    -0.27       0.00    -0.07
 14   3.9652      0.00     0.26       0.00     0.09
 15   3.9654      0.00     0.49       0.00     0.09
 16   3.9682      0.00     0.10       0.00    -0.15
 17   8.8278      0.00     0.26       0.00    -0.53
 18   8.8304      0.00     0.19       0.00    -0.77
 19   8.8306      0.00     0.58       0.00    -0.36
 20   9.2895      0.00     0.00       0.00     0.03
 21   9.2923      0.00     0.12       0.00     0.30
 22   9.2950      0.00     0.20       0.00     0.13
 23   9.8418      0.00    -0.33       0.00     0.45
 24   9.8419      0.00    -0.08       0.00     0.67
 25   9.8419      0.00    -0.15       0.00     0.61
 26   9.9972      0.00    -0.16       0.00     0.04
 27   9.9972      0.00    -0.11       0.00     0.01
 28   9.9972      0.00    -0.13       0.00    -0.02
 29   9.9972      0.00    -0.09       0.00    -0.04

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.

181855    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        46.419    46.418    46.419
ecceobj         0.189     0.189     0.189
incobj         28.600    28.600    28.600
qmin           36.802    36.808    36.798
qmax           55.717    55.711    55.718
amean          46.037    46.039    46.036
amin           45.653    45.645    45.643
amax           46.480    46.483    46.480
emean           0.182     0.182     0.182
emin            0.165     0.165     0.165
emax            0.199     0.199     0.199
imean          27.944    27.945    27.941
imin           27.565    27.571    27.568
imax           28.342    28.337    28.346
excite_mean     0.503     0.503     0.503
fracstop        1.000     1.000     1.000
cjmean          2.803     2.803     2.803

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       167.6     167.5     167.3
kozaiamp        180.0     180.0     180.0