Orbit Fit and Astrometric record for 181868

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: 181868    
# Created Mon Dec 18 02:36:38 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   29 observations of   29
# Arc:  14.09y
# First observation: 1999/02/11
#  Last observation: 2013/03/14
# Chi-squared of fit:   134.38 DOF:   52 RMS:  0.38
# Min/Max residuals:    -1.01    0.90
# Exact a, adot, b, bdot, g, gdot:
  1.585535E-05  2.266887E-02  4.400116E-09 -6.801683E-03  2.393434E-02 -6.554747E-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
    0.515536  122.127280   -0.344203    0.008166   -0.931900  2451220.782433
# Heliocentric elements and errors
Epoch:              2451220.5000  =  1999/02/11
Mean Anomaly:          312.46573 +/-     0.000
Argument of Peri:      256.27534 +/-     0.000
Long of Asc Node:      304.26145 +/-     0.000
Inclination:            16.70275 +/-     0.000
Eccentricity:         0.28809170 +/-    0.0000
Semi-Major Axis:     49.35829306 +/-    0.0000
Time of Perihelion: 2467944.6065 +/-       0.0
Perihelion:          35.13857875 +/-    0.0000
Aphelion:            63.57800738 +/-    0.0000
Period (y)              346.7755 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -22.99767084 +/-    0.0000
Ecliptic Y           35.98747114 +/-    0.0000
Ecliptic Z            0.37592872 +/-    0.0000
Ecliptic XDOT        -0.00180270 +/-    0.0000
Ecliptic YDOT        -0.00199903 +/-    0.0000
Ecliptic ZDOT        -0.00078476 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.71003481 +/-    0.0000
Geocenter to KBO     41.78118666 +/-    0.0000
# Hcoef:  7.53

The following table shows the complete astrometric record for 181868. 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 (181868) followed by the observatory code and reference code for the source of the astrometry.

1999 02  11.28169  08 18 03.06   +20 11 17.9   23.3R 181868    568  Ca4178      
1999 02  11.36257  08 18 02.67   +20 11 18.7   23.3R 181868    568  Ca4178      
1999 02  17.42087  08 17 34.33   +20 12 25.4   23.3R 181868    568  Ca4178      
1999 02  17.48816  08 17 34.01   +20 12 26.4   23.3R 181868    568  Ca4178      
1999 04  08.27506  08 15 14.72   +20 16 13.4   24.1R 181868    568  Ca4506      
1999 04  09.26671  08 15 14.13   +20 16 10.8   24.1R 181868    568  Ca4506      
1999 12  29.61447  08 26 42.95   +19 20 55.1         181868    568  Ca8502      
1999 12  29.63415  08 26 42.85   +19 20 55.3         181868    568  Ca8502      
1999 12  30.60682  08 26 38.47   +19 21 06.8         181868    568  Ca8502      
2000 01  29.13520  08 24 11.82   +19 27 33.3         181868    705  Ca9922      
2000 01  29.16005  08 24 11.67   +19 27 34.2         181868    705  Ca9922      
2000 01  29.19411  08 24 11.49   +19 27 34.5   23.9R 181868    705  Ca9922      
2000 01  30.23695  08 24 06.12   +19 27 48.8         181868    705  Ca9922      
2000 01  30.26146  08 24 05.98   +19 27 49.2         181868    705  Ca9922      
2000 01  30.28768  08 24 05.89   +19 27 49.4         181868    705  Ca9922      
2001 02  23.13358  08 27 10.95   +18 51 02.3   23.5R 181868    309  Cc6423      
2001 02  23.19969  08 27 10.66   +18 51 03.1   23.4R 181868    309  Cc6423      
2001 02  24.11119  08 27 06.74   +18 51 13.6         181868    309  Cc6423      
2005 01  19.408955 08 50 31.93   +15 43 52.2         181868    645  C~1Rza      
2005 01  19.409785 08 50 31.93   +15 43 52.3         181868    645  C~1Rza      
2005 01  19.412272 08 50 31.92   +15 43 52.3         181868    645  C~1Rza      
2005 02  04.204562 08 49 11.32   +15 48 06.5         181868    645  C~1dEJ      
2005 02  04.205391 08 49 11.31   +15 48 06.5         181868    645  C~1dEJ      
2005 02  04.207879 08 49 11.31   +15 48 06.5         181868    645  C~1dEJ      
2007 11  08.46959  09 09 14.70   +13 14 26.6         181868    695  Cy3962      
2007 11  09.44827  09 09 15.33   +13 14 14.9         181868    695  Cy3962      
2013 03  13.18292  09 28 23.85   +09 13 47.8   22.4R 181868    695  C~0upI      
2013 03  14.17468  09 28 19.73   +09 14 08.1         181868    695  C~0upI      
2013 03  14.26206  09 28 19.37   +09 14 10.1         181868    695  C~0upI      

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    -0.17       0.00     0.85
  2   0.0002      0.00    -0.29       0.00    -1.01
  3   0.0168      0.00    -0.36       0.00    -0.69
  4   0.0170      0.00    -0.50       0.00    -0.38
  5   0.1533      0.00     0.56       0.00    -0.40
  6   0.1560      0.00     0.55       0.00    -0.39
  7   0.8798      0.00     0.40       0.00    -0.04
  8   0.8798      0.00     0.25       0.00    -0.06
  9   0.8825      0.00     0.31       0.00     0.02
 10   0.9633      0.00     0.47       0.00    -0.06
 11   0.9634      0.00     0.15       0.00     0.50
 12   0.9635      0.00     0.10       0.00     0.33
 13   0.9663      0.00    -0.33       0.00     0.65
 14   0.9664      0.00    -0.52       0.00     0.72
 15   0.9665      0.00     0.17       0.00     0.57
 16   2.0338      0.00     0.04       0.00     0.55
 17   2.0340      0.00     0.08       0.00     0.61
 18   2.0365      0.00     0.19       0.00     0.90
 19   5.9387      0.00     0.07       0.00    -0.39
 20   5.9387      0.00     0.14       0.00    -0.30
 21   5.9388      0.00     0.18       0.00    -0.34
 22   5.9820      0.00     0.00       0.00    -0.03
 23   5.9820      0.00    -0.08       0.00    -0.05
 24   5.9820      0.00     0.11       0.00    -0.09
 25   8.7397      0.00    -0.03       0.00    -0.02
 26   8.7424      0.00     0.04       0.00     0.04
 27  14.0832      0.00     0.00       0.00    -0.05
 28  14.0859      0.00    -0.05       0.00    -0.10
 29  14.0862      0.00     0.06       0.00     0.11

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.

181868    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        49.520    49.519    49.520
ecceobj         0.289     0.289     0.289
incobj         16.677    16.677    16.677
qmin           34.596    34.523    34.502
qmax           65.392    65.262    65.266
amean          49.552    49.582    49.555
amin           49.033    49.013    49.034
amax           50.208    50.204    50.172
emean           0.280     0.283     0.286
emin            0.259     0.265     0.265
emax            0.302     0.301     0.302
imean          18.734    18.559    18.464
imin           17.825    17.752    17.727
imax           19.558    19.235    19.227
excite_mean     0.426     0.426     0.427
fracstop        1.000     1.000     1.000
cjmean          2.939     2.939     2.939

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       181.5     187.5     177.7
kozaiamp        180.0     180.0     180.0