Orbit Fit and Astrometric record for 08AU138

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: 08AU138   
# Created Fri Nov 16 02:08:52 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   30 observations of   30
# Arc:  12.39y
# First observation: 2003/10/24
#  Last observation: 2016/03/13
# Chi-squared of fit:    77.69 DOF:   54 RMS:  0.28
# Min/Max residuals:    -0.99    0.99
# Exact a, adot, b, bdot, g, gdot:
  1.056984E-05  1.608892E-02  4.319217E-06  4.765051E-03  2.251646E-02  8.999876E-04
# Covariance matrix:
  2.3548E-13 -5.9322E-14  2.3080E-14 -1.5308E-14  6.6354E-15 -2.4577E-13
 -5.9322E-14  3.5126E-14 -2.6148E-14  9.5642E-15  4.0652E-14  1.6923E-13
  2.3080E-14 -2.6148E-14  1.8403E-13 -3.2239E-14 -4.7463E-14 -1.3947E-13
 -1.5308E-14  9.5642E-15 -3.2239E-14  9.1054E-15  6.8803E-15  6.0187E-14
  6.6354E-15  4.0652E-14 -4.7463E-14  6.8803E-15  1.3868E-13  1.6005E-13
 -2.4577E-13  1.6923E-13 -1.3947E-13  6.0187E-14  1.6005E-13  1.0314E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   39.792689  115.878929    0.992781    0.049457   -0.059298  2452936.962929
# Heliocentric elements and errors
Epoch:              2452936.5000  =  2003/10/24
Mean Anomaly:          173.96908 +/-     0.010
Argument of Peri:      253.03534 +/-     0.006
Long of Asc Node:       50.55752 +/-     0.000
Inclination:            42.82555 +/-     0.000
Eccentricity:         0.36910101 +/-    0.0000
Semi-Major Axis:     32.51849185 +/-    0.0011
Time of Perihelion: 2420205.1755 +/-       2.6
Perihelion:          20.51588374 +/-    0.0011
Aphelion:            44.52109996 +/-    0.0017
Period (y)              185.4402 +/-      0.01
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -14.03836334 +/-    0.0002
Ecliptic Y           31.20827017 +/-    0.0005
Ecliptic Z           28.42431519 +/-    0.0005
Ecliptic XDOT        -0.00163969 +/-    0.0000
Ecliptic YDOT        -0.00111790 +/-    0.0000
Ecliptic ZDOT         0.00051539 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.48563862 +/-    0.0005
Geocenter to KBO     44.41194934 +/-    0.0007
# Hcoef:  6.64

The following table shows the complete astrometric record for 08AU138. 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 (08AU138) followed by the observatory code and reference code for the source of the astrometry.

2003 10  24.462186 08 45 48.87   +59 33 47.1         08AU138   645  C~1SLL      
2003 10  24.463015 08 45 48.86   +59 33 47.1         08AU138   645  C~1SLL      
2003 10  24.465503 08 45 48.86   +59 33 47.3         08AU138   645  C~1SLL      
2003 11  30.382485 08 45 24.41   +60 07 22.0         08AU138   645  C~1SLL      
2003 11  30.383314 08 45 24.41   +60 07 22.1         08AU138   645  C~1SLL      
2003 11  30.385802 08 45 24.40   +60 07 22.2         08AU138   645  C~1SLL      
2008 01  08.36123  09 12 34.75   +60 13 39.3   23.4r 08AU138   568  C~1QdQ      
2008 01  08.41086  09 12 34.35   +60 13 41.3   22.7r 08AU138   568  C~1QdQ      
2008 01  08.45929  09 12 33.97   +60 13 43.4   22.7r 08AU138   568  C~1QdQ      
2008 03  08.23787  09 03 48.13   +60 26 12.5   23.3r 08AU138   568  C~1QdQ      
2008 03  09.22854  09 03 40.78   +60 25 54.1         08AU138   568  C~1QdQ      
2008 03  10.22917  09 03 33.43   +60 25 34.3   23.5r 08AU138   568  C~1QdQ      
2008 04  04.34122  09 01 12.98   +60 12 29.7   23.3r 08AU138   568  C~1QdQ      
2008 04  06.26762  09 01 06.10   +60 11 09.3   23.2r 08AU138   568  C~1QdQ      
2008 05  03.19661  09 00 35.15   +59 49 00.5         08AU138   695  C~1QdQ      
2008 05  03.23034  09 00 35.26   +59 48 59.2         08AU138   695  C~1QdQ      
2008 05  04.18566  09 00 36.50   +59 48 06.4         08AU138   695  C~1QdQ      
2008 05  04.19171  09 00 36.46   +59 48 06.9         08AU138   695  C~1QdQ      
2008 12  06.41279  09 23 21.67   +59 35 40.7         08AU138   675  C~1QdQ      
2008 12  06.41898  09 23 21.63   +59 35 41.2   22.5R 08AU138   675  C~1QdQ      
2008 12  06.49616  09 23 21.41   +59 35 45.4   22.4R 08AU138   675  C~1QdQ      
2008 12  06.50262  09 23 21.37   +59 35 46.2         08AU138   675  C~1QdQ      
2008 12  21.49838  09 22 12.94   +59 49 38.0         08AU138   695  C~1QdQ      
2008 12  21.55658  09 22 12.59   +59 49 41.1         08AU138   695  C~1QdQ      
2008 12  22.47445  09 22 07.33   +59 50 29.6         08AU138   695  C~1QdQ      
2010 01  21.34999  09 26 03.46   +60 00 17.9         08AU138   568  C~1QdQ      
2010 01  21.38702  09 26 03.13   +60 00 19.1         08AU138   568  C~1QdQ      
2010 01  21.41805  09 26 02.86   +60 00 20.2         08AU138   568  C~1QdQ      
2016 03  13.15771  10 02 59.56   +58 32 53.4   22.8R 08AU138   G37  C~1pPw      
2016 03  13.19772  10 02 59.21   +58 32 53.1         08AU138   G37  C~1pPw      

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     0.14       0.00    -0.24
  2   0.0000      0.00    -0.04       0.00    -0.28
  3   0.0000      0.00    -0.13       0.00    -0.21
  4   0.1011      0.00    -0.02       0.00     0.06
  5   0.1011      0.00     0.03       0.00     0.11
  6   0.1011      0.00     0.03       0.00     0.07
  7   4.2078      0.00    -0.08       0.00     0.21
  8   4.2079      0.00    -0.03       0.00     0.13
  9   4.2081      0.00     0.21       0.00     0.21
 10   4.3717      0.00     0.11       0.00    -0.24
 11   4.3744      0.00     0.25       0.00    -0.09
 12   4.3772      0.00    -0.16       0.00    -0.18
 13   4.4459      0.00    -0.11       0.00    -0.11
 14   4.4512      0.00    -0.18       0.00    -0.08
 15   4.5249      0.00    -0.99       0.00    -0.31
 16   4.5250      0.00     0.12       0.00     0.25
 17   4.5276      0.00     0.99       0.00    -0.42
 18   4.5277      0.00     0.28       0.00     0.41
 19   5.1196      0.00    -0.11       0.00    -0.10
 20   5.1197      0.00    -0.39       0.00     0.04
 21   5.1199      0.00     0.36       0.00    -0.20
 22   5.1199      0.00     0.10       0.00     0.23
 23   5.1609      0.00    -0.31       0.00     0.22
 24   5.1611      0.00    -0.48       0.00     0.27
 25   5.1636      0.00    -0.13       0.00     0.32
 26   6.2447      0.00     0.36       0.00     0.11
 27   6.2448      0.00     0.29       0.00     0.05
 28   6.2449      0.00     0.34       0.00     0.09
 29  12.3852      0.00     0.11       0.00    -0.21
 30  12.3853      0.00    -0.37       0.00    -0.17

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.

08AU138    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        32.426    32.426    32.426
ecceobj         0.374     0.374     0.374
incobj         42.763    42.763    42.763
qmin           20.141    20.141    20.141
qmax           45.195    45.194    45.195
amean          32.303    32.429    32.350
amin           31.935    32.262    31.862
amax           32.756    32.756    32.930
emean           0.370     0.373     0.302
emin            0.360     0.366     0.200
emax            0.380     0.380     0.380
imean          42.155    42.037    43.606
imin           41.928    41.928    41.928
imax           42.421    42.193    45.282
excite_mean     0.766     0.766     0.754
fracstop        0.003     0.002     0.036
cjmean          2.346     2.346     2.347

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       253.3     253.4     251.6
kozaiamp          1.1       0.9       7.3