Orbit Fit and Astrometric record for 08LC18

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: 08LC18    
# Created Mon Oct 23 01:37:46 2017
# Orbit generated from Bernstein formalism
# Fitting   14 observations of   14
# Arc:   4.12y
# First observation: 2008/06/07
#  Last observation: 2012/07/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000016   0.029835   0.000014  -0.015514   0.031427   0.000000
# Chi-squared of fit:    17.13 DOF:   22 RMS:  0.20
# Min/Max residuals:    -0.47    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.486357E-05  2.994983E-02 -7.141053E-06 -1.553846E-02  3.186531E-02  6.957918E-04
# Covariance matrix:
  3.2284E-13 -3.0192E-13 -3.6698E-14  1.7181E-13  2.8733E-13 -2.6652E-12
 -3.0192E-13  1.0065E-12  1.3699E-13 -6.0568E-13 -6.1680E-14  9.3544E-12
 -3.6698E-14  1.3699E-13  1.6760E-13 -1.3531E-13 -9.2674E-15  1.3471E-12
  1.7181E-13 -6.0568E-13 -1.3531E-13  4.4158E-13  6.5090E-14 -5.9712E-12
  2.8733E-13 -6.1680E-14 -9.2674E-15  6.5090E-14  6.8814E-13 -1.0350E-12
 -2.6652E-12  9.3544E-12  1.3471E-12 -5.9712E-12 -1.0350E-12  9.2240E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.884392  -96.654569    0.114632    0.050523   -1.002633  2454624.949404
# Heliocentric elements and errors
Epoch:              2454620.5000  =  2008/06/03
Mean Anomaly:          165.98475 +/-     0.203
Argument of Peri:        5.94652 +/-     0.200
Long of Asc Node:       88.52947 +/-     0.000
Inclination:            27.48352 +/-     0.000
Eccentricity:         0.07823708 +/-    0.0001
Semi-Major Axis:     30.09535898 +/-    0.0036
Time of Perihelion: 2487120.3289 +/-      33.6
Perihelion:          27.74078594 +/-    0.0039
Aphelion:            32.44993201 +/-    0.0044
Period (y)              165.1040 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -3.86092044 +/-    0.0001
Ecliptic Y          -32.12002789 +/-    0.0008
Ecliptic Z            1.57899778 +/-    0.0000
Ecliptic XDOT         0.00254758 +/-    0.0000
Ecliptic YDOT        -0.00042327 +/-    0.0000
Ecliptic ZDOT        -0.00133047 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   32.38975351 +/-    0.0008
Geocenter to KBO     31.38209266 +/-    0.0008
# Hcoef:  8.28

The following table shows the complete astrometric record for 08LC18. 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 (08LC18) followed by the observatory code and reference code for the source of the astrometry.

2008 06  07.44865  17 31 37.769  -20 23 28.35  23.2r 08LC18    568  C~0K8b      
2008 06  07.48705  17 31 37.523  -20 23 28.40        08LC18    568  C~0K8b      
2008 06  07.52545  17 31 37.257  -20 23 28.54        08LC18    568  C~0K8b      
2008 07  03.99931  17 28 42.218  -20 25 29.12        08LC18    304  C~0K8b      
2008 07  04.00420  17 28 42.168  -20 25 29.33        08LC18    304  C~0K8b      
2008 07  09.22847  17 28 10.106  -20 26 01.25        08LC18    807  C~0Lmu      
2008 08  21.99305  17 25 09.236  -20 32 36.35        08LC18    304  C~0Lmu      
2008 08  22.00368  17 25 09.160  -20 32 36.77        08LC18    304  C~0Lmu      
2008 08  23.03750  17 25 07.412  -20 32 48.62        08LC18    304  C~0Lmu      
2009 05  23.39131  17 40 27.382  -21 20 08.58        08LC18    304  C~0Lmu      
2009 06  22.31597  17 37 10.257  -21 22 32.51        08LC18    568  C~0Lmu      
2009 06  22.45555  17 37 09.276  -21 22 33.64        08LC18    568  C~0Lmu      
2012 07  21.32625  17 56 01.277  -24 13 13.51        08LC18    568  C~2AD7      
2012 07  22.33476  17 55 55.427  -24 13 21.08  23.2r 08LC18    568  C~2AD7      

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    -0.00       0.00    -0.12
  2   0.0001     -3.45     0.21      -0.22    -0.03
  3   0.0002     -7.18     0.14      -0.54    -0.04
  4   0.0727  -2458.63     0.05    -247.48     0.26
  5   0.0727  -2459.32    -0.21    -247.72     0.07
  6   0.0870  -2907.70     0.00    -303.96     0.02
  7   0.2068  -5423.69     0.30    -842.81     0.10
  8   0.2069  -5424.73    -0.47    -843.29    -0.24
  9   0.2097  -5448.56     0.11    -856.58     0.19
 10   0.9581   7564.53    -0.29   -3084.15    -0.02
 11   1.0400   4815.36     0.23   -3332.21     0.06
 12   1.0404   4801.70    -0.12   -3333.89    -0.31
 13   4.1201  20800.96     0.33  -13239.55     0.07
 14   4.1229  20720.06    -0.29  -13247.64    -0.01

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.

08LC18    quality flag:3

Type:            1:1       1:1       1:1

axisobj        29.848    29.859    29.837
ecceobj         0.086     0.085     0.086
incobj         27.586    27.587    27.586
qmin           26.834    26.776    26.871
qmax           33.473    33.537    33.541
amean          30.109    30.109    30.109
amin           29.811    29.820    29.806
amax           30.420    30.414    30.433
emean           0.081     0.081     0.081
emin            0.055     0.055     0.055
emax            0.105     0.105     0.104
imean          26.002    26.016    25.993
imin           25.786    25.804    25.778
imax           26.199    26.220    26.190
excite_mean     0.446     0.446     0.446
fracstop        1.000     1.000     1.000
cjmean          2.793     2.793     2.793

libcent 0       298.6     299.5     298.1
libamp  0        20.6      18.4      22.3
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       182.4     181.7     183.1
kozaiamp        179.9     180.0     180.0