Orbit Fit and Astrometric record for 181867

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: 181867    
# Created Mon Oct 23 01:36:38 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   31 observations of   31
# Arc:  16.18y
# First observation: 1999/02/10
#  Last observation: 2015/04/15
# Chi-squared of fit:   171.73 DOF:   56 RMS:  0.42
# Min/Max residuals:    -0.77    1.08
# Exact a, adot, b, bdot, g, gdot:
  1.641625E-05  2.991253E-02  3.004950E-07 -2.863677E-03  2.653098E-02  3.201050E-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
    0.237788  122.736597   -0.317958    0.003686   -0.940930  2451219.796963
# Heliocentric elements and errors
Epoch:              2451220.5000  =  1999/02/11
Mean Anomaly:           16.36432 +/-     0.000
Argument of Peri:      147.14862 +/-     0.000
Long of Asc Node:      305.61515 +/-     0.000
Inclination:             5.48643 +/-     0.000
Eccentricity:         0.29015742 +/-    0.0000
Semi-Major Axis:     52.73458330 +/-    0.0000
Time of Perihelion: 2444862.2579 +/-       0.0
Perihelion:          37.43325242 +/-    0.0000
Aphelion:            68.03591418 +/-    0.0000
Period (y)              382.9583 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -21.15122312 +/-    0.0000
Ecliptic Y           32.32402453 +/-    0.0000
Ecliptic Z            0.15643527 +/-    0.0000
Ecliptic XDOT        -0.00277749 +/-    0.0000
Ecliptic YDOT        -0.00138137 +/-    0.0000
Ecliptic ZDOT        -0.00029414 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.62945997 +/-    0.0000
Geocenter to KBO     37.69174574 +/-    0.0000
# Hcoef:  7.41

The following table shows the complete astrometric record for 181867. 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 (181867) followed by the observatory code and reference code for the source of the astrometry.

1999 02  10.29622  08 20 18.50   +19 46 46.2   23.0R 181867    568  Ca4013      
1999 02  10.34765  08 20 18.24   +19 46 47.2   23.0R 181867    568  Ca4013      
1999 02  18.29056  08 19 38.82   +19 48 43.0   23.0R 181867    568  Ca4013      
1999 02  18.30215  08 19 38.78   +19 48 43.1   23.0R 181867    568  Ca4013      
1999 04  08.30140  08 17 18.15   +19 54 48.8   23.2R 181867    568  Ca4843      
1999 04  09.29774  08 17 17.68   +19 54 48.6   23.2R 181867    568  Ca4843      
1999 05  06.26384  08 17 45.20   +19 52 26.7   22.9R 181867    568  Ca4843      
1999 05  06.31388  08 17 45.30   +19 52 26.1   22.9R 181867    568  Ca4843      
1999 12  29.62435  08 30 55.33   +19 01 22.4         181867    568  Ca8502      
1999 12  29.64395  08 30 55.24   +19 01 22.6         181867    568  Ca8502      
1999 12  30.61677  08 30 50.70   +19 01 37.3         181867    568  Ca8502      
2000 01  29.20477  08 28 16.77   +19 09 52.6         181867    705  Ca9922      
2000 01  29.23570  08 28 16.65   +19 09 53.3   23.2R 181867    705  Ca9922      
2000 01  29.26670  08 28 16.48   +19 09 53.8         181867    705  Ca9922      
2000 01  30.21987  08 28 11.34   +19 10 09.6         181867    705  Ca9922      
2000 01  30.24484  08 28 11.16   +19 10 10.2         181867    705  Ca9922      
2000 01  30.26921  08 28 11.05   +19 10 10.7         181867    705  Ca9922      
2002 02  03.54222  08 41 15.78   +18 02 15.9   22.5R 181867    568  Cf1463      
2002 02  03.60433  08 41 15.43   +18 02 17.7         181867    568  Cf1463      
2006 01  19.34353  09 08 25.19   +15 31 58.9   22.7R 181867    250  S~06I2      
2006 01  19.34793  09 08 25.17   +15 31 59.0         181867    250  S~06I2      
2006 01  19.35233  09 08 25.15   +15 31 59.1         181867    250  S~06I2      
2006 01  19.35673  09 08 25.12   +15 31 59.2         181867    250  S~06I2      
2007 11  08.48626  09 23 20.72   +14 08 28.7         181867    695  Cy3962      
2007 11  09.46497  09 23 21.82   +14 08 20.4         181867    695  Cy3962      
2008 03  04.20979  09 17 07.72   +14 32 44.8         181867    695  Cy7583      
2008 03  04.29547  09 17 07.34   +14 32 46.5         181867    695  Cy7583      
2008 03  05.31851  09 17 02.88   +14 33 06.3         181867    695  Cy7583      
2015 04  15.16142  09 55 13.44   +10 21 09.9   23.6R 181867    695  C~1RYc      
2015 04  15.23119  09 55 13.28   +10 21 11.0         181867    695  C~1RYc      
2015 04  15.30854  09 55 13.13   +10 21 11.5         181867    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    -0.09       0.00     0.52
  2   0.0001      0.00     0.38       0.00    -0.27
  3   0.0219      0.00     0.00       0.00    -0.35
  4   0.0219      0.00     0.25       0.00    -0.41
  5   0.1561      0.00    -0.05       0.00    -0.77
  6   0.1588      0.00     0.04       0.00    -0.56
  7   0.2326      0.00    -0.36       0.00    -0.50
  8   0.2328      0.00    -0.64       0.00    -0.59
  9   0.8825      0.00     0.25       0.00     0.23
 10   0.8825      0.00     0.29       0.00     0.14
 11   0.8852      0.00     0.33       0.00     0.20
 12   0.9662      0.00    -0.45       0.00     0.71
 13   0.9663      0.00     0.29       0.00     0.87
 14   0.9664      0.00     0.29       0.00     0.84
 15   0.9690      0.00     0.27       0.00     0.24
 16   0.9691      0.00    -0.38       0.00     0.41
 17   0.9691      0.00    -0.03       0.00     0.49
 18   2.9822      0.00     0.38       0.00     0.40
 19   2.9824      0.00     0.09       0.00     1.08
 20   6.9406      0.00     0.10       0.00    -0.74
 21   6.9406      0.00     0.13       0.00    -0.73
 22   6.9406      0.00     0.15       0.00    -0.71
 23   6.9406      0.00     0.02       0.00    -0.70
 24   8.7425      0.00    -0.24       0.00    -0.30
 25   8.7452      0.00    -0.28       0.00    -0.13
 26   9.0620      0.00     0.16       0.00     0.21
 27   9.0623      0.00     0.20       0.00     0.24
 28   9.0651      0.00     0.16       0.00     0.26
 29  16.1749      0.00     0.10       0.00     0.17
 30  16.1750      0.00    -0.04       0.00     0.39
 31  16.1753      0.00     0.20       0.00    -0.08

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.

181867    quality flag:3

Type:        7:3EEEE   7:3EEEE   7:3EEEE

axisobj        52.967    52.967    52.967
ecceobj         0.293     0.293     0.293
incobj          5.478     5.478     5.478
qmin           36.853    36.853    36.851
qmax           69.979    69.983    69.966
amean          52.970    52.970    52.969
amin           52.367    52.368    52.367
amax           53.717    53.717    53.717
emean           0.288     0.288     0.288
emin            0.272     0.272     0.272
emax            0.304     0.304     0.303
imean           7.317     7.317     7.317
imin            6.731     6.729     6.733
imax            8.228     8.230     8.225
excite_mean     0.315     0.315     0.315
fracstop        1.000     1.000     1.000
cjmean          3.087     3.087     3.087

libcent 0       178.7     179.1     178.2
libamp  0        96.1      96.0      95.9
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       212.9     212.9     212.9
kozaiamp        180.0     179.9     179.9