Orbit Fit and Astrometric record for 181871

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: 181871    
# Created Tue Oct 24 01:36:38 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   23 observations of   23
# Arc:  16.17y
# First observation: 1999/02/12
#  Last observation: 2015/04/15
# Chi-squared of fit:    78.12 DOF:   40 RMS:  0.33
# Min/Max residuals:    -0.52    1.05
# Exact a, adot, b, bdot, g, gdot:
  1.733722E-05  2.534401E-02  1.921802E-06 -3.268216E-04  2.502341E-02  1.202302E-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
   -0.335899  121.668052   -0.367668   -0.005632   -0.923193  2451221.761613
# Heliocentric elements and errors
Epoch:              2451222.5000  =  1999/02/13
Mean Anomaly:           39.97326 +/-     0.000
Argument of Peri:      157.15036 +/-     0.000
Long of Asc Node:      278.15357 +/-     0.000
Inclination:             0.80629 +/-     0.000
Eccentricity:         0.08625010 +/-    0.0000
Semi-Major Axis:     43.61814619 +/-    0.0000
Time of Perihelion: 2439539.1790 +/-       0.0
Perihelion:          39.85607665 +/-    0.0000
Aphelion:            47.38021572 +/-    0.0000
Period (y)              288.0773 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -21.76979091 +/-    0.0000
Ecliptic Y           34.60417156 +/-    0.0000
Ecliptic Z           -0.23420706 +/-    0.0000
Ecliptic XDOT        -0.00243070 +/-    0.0000
Ecliptic YDOT        -0.00133499 +/-    0.0000
Ecliptic ZDOT        -0.00003653 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.88305569 +/-    0.0000
Geocenter to KBO     39.96258469 +/-    0.0000
# Hcoef:  7.31

The following table shows the complete astrometric record for 181871. 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 (181871) followed by the observatory code and reference code for the source of the astrometry.

1999 02  12.26087  08 15 20.33   +19 27 39.6   23.1R 181871    568  Ca4208      
1999 02  12.35267  08 15 19.88   +19 27 41.2   23.1R 181871    568  Ca4208      
1999 02  17.39664  08 14 56.19   +19 28 57.5   23.1R 181871    568  Ca4208      
1999 02  17.40828  08 14 56.13   +19 28 57.7   23.1R 181871    568  Ca4208      
1999 04  08.24794  08 12 39.51   +19 36 22.5   23.5R 181871    568  Ca4507      
1999 04  09.24066  08 12 39.08   +19 36 24.2   23.5R 181871    568  Ca4507      
2000 01  01.55726  08 24 50.58   +18 55 05.8         181871    568  Ca8502      
2000 01  01.60011  08 24 50.37   +18 55 06.4   23.2R 181871    568  Ca8502      
2000 01  01.63744  08 24 50.18   +18 55 06.9         181871    568  Ca8502      
2000 01  02.54290  08 24 45.94   +18 55 21.2         181871    568  Ca8502      
2000 01  02.58410  08 24 45.73   +18 55 21.7         181871    568  Ca8502      
2000 01  02.63432  08 24 45.49   +18 55 22.7         181871    568  Ca8502      
2002 02  03.52390  08 33 50.73   +18 20 55.7   22.4R 181871    568  Cf1464      
2002 02  03.59538  08 33 50.34   +18 20 57.2         181871    568  Cf1464      
2002 02  04.45948  08 33 46.00   +18 21 13.4         181871    568  Cf1464      
2007 11  08.47845  09 12 25.78   +15 38 48.3         181871    695  Cy3962      
2007 11  09.45679  09 12 26.53   +15 38 44.1         181871    695  Cy3962      
2008 03  04.20047  09 06 00.85   +16 06 09.1         181871    695  Cy7583      
2008 03  04.28346  09 06 00.50   +16 06 10.7         181871    695  Cy7583      
2008 03  05.30183  09 05 56.24   +16 06 29.5         181871    695  Cy7583      
2015 04  15.15170  09 41 57.63   +13 10 31.5   23.2R 181871    695  C~1RYc      
2015 04  15.21951  09 41 57.50   +13 10 32.2         181871    695  C~1RYc      
2015 04  15.29631  09 41 57.36   +13 10 32.9         181871    695  C~1RYc      

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    -0.08       0.00     0.41
  2   0.0003      0.00    -0.34       0.00    -0.22
  3   0.0141      0.00    -0.16       0.00    -0.04
  4   0.0141      0.00    -0.24       0.00    -0.01
  5   0.1505      0.00     0.09       0.00     0.16
  6   0.1533      0.00     0.07       0.00     0.20
  7   0.8851      0.00     0.34       0.00    -0.24
  8   0.8853      0.00     0.26       0.00    -0.31
  9   0.8854      0.00     0.08       0.00    -0.38
 10   0.8878      0.00     0.42       0.00    -0.38
 11   0.8879      0.00     0.25       0.00    -0.52
 12   0.8881      0.00     0.27       0.00    -0.30
 13   2.9768      0.00     0.06       0.00     0.54
 14   2.9770      0.00    -0.27       0.00     0.75
 15   2.9793      0.00     0.30       0.00     1.05
 16   8.7371      0.00    -0.34       0.00     0.07
 17   8.7398      0.00    -0.47       0.00     0.16
 18   9.0566      0.00     0.33       0.00     0.01
 19   9.0569      0.00     0.41       0.00     0.07
 20   9.0597      0.00     0.29       0.00     0.19
 21  16.1694      0.00    -0.07       0.00    -0.22
 22  16.1696      0.00    -0.07       0.00    -0.19
 23  16.1698      0.00     0.02       0.00    -0.25

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.

181871    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE

axisobj        43.760    43.760    43.759
ecceobj         0.089     0.089     0.089
incobj          0.804     0.804     0.804
qmin           39.374    39.376    39.381
qmax           48.442    48.493    48.404
amean          43.726    43.726    43.726
amin           43.338    43.338    43.338
amax           44.151    44.160    44.133
emean           0.085     0.085     0.085
emin            0.074     0.074     0.074
emax            0.097     0.098     0.097
imean           2.674     2.675     2.674
imin            1.858     1.858     1.856
imax            3.441     3.441     3.441
excite_mean     0.098     0.098     0.098
fracstop        1.000     1.000     1.000
cjmean          3.087     3.087     3.087

libcent 0       179.1     178.3     180.6
libamp  0       138.7     137.4     140.9
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       186.1     186.1     186.2
kozaiamp        180.0     179.9     179.9