Orbit Fit and Astrometric record for 07LJ38

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: 07LJ38    
# Created Tue Oct 24 01:37:42 2017
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   27
# Arc:  10.03y
# First observation: 2005/05/11
#  Last observation: 2015/05/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.003094   0.033562   0.000593  -0.002980   0.030051   0.000000
# Chi-squared of fit:    17.65 DOF:   48 RMS:  0.14
# Min/Max residuals:    -0.41    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.955298E-05  3.145465E-02 -2.178753E-06 -2.831666E-03  2.614624E-02 -3.387811E-03
# Covariance matrix:
  4.2742E-13 -1.7563E-13 -2.4497E-14  1.3220E-14 -3.5353E-14 -4.0333E-13
 -1.7563E-13  1.1416E-13  2.6267E-14 -9.9915E-15  1.4461E-13  2.9160E-13
 -2.4497E-14  2.6267E-14  1.6255E-13 -3.0305E-14  6.4624E-14  7.2097E-14
  1.3220E-14 -9.9915E-15 -3.0305E-14  8.5285E-15 -1.5122E-14 -2.7349E-14
 -3.5353E-14  1.4461E-13  6.4624E-14 -1.5122E-14  5.9706E-13  3.9885E-13
 -4.0333E-13  2.9160E-13  7.2097E-14 -2.7349E-14  3.9885E-13  7.9782E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   31.938912 -122.159929    0.124411    0.528639   -0.847866  2453501.745879
# Heliocentric elements and errors
Epoch:              2453500.5000  =  2005/05/10
Mean Anomaly:          353.91458 +/-     0.003
Argument of Peri:      117.63596 +/-     0.005
Long of Asc Node:      137.72636 +/-     0.000
Inclination:            31.54354 +/-     0.000
Eccentricity:         0.47483053 +/-    0.0001
Semi-Major Axis:     73.12274325 +/-    0.0183
Time of Perihelion: 2457361.1899 +/-       0.9
Perihelion:          38.40183252 +/-    0.0128
Aphelion:           107.84365397 +/-    0.0282
Period (y)              625.2978 +/-      0.23
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -17.91687728 +/-    0.0005
Ecliptic Y          -28.25717694 +/-    0.0008
Ecliptic Z           20.23288842 +/-    0.0006
Ecliptic XDOT         0.00286576 +/-    0.0000
Ecliptic YDOT        -0.00163819 +/-    0.0000
Ecliptic ZDOT        -0.00043924 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.10054109 +/-    0.0007
Geocenter to KBO     38.24642321 +/-    0.0011
# Hcoef:  7.33

The following table shows the complete astrometric record for 07LJ38. 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 (07LJ38) followed by the observatory code and reference code for the source of the astrometry.

2005 05  11.245136 16 10 11.93   +11 30 48.0   23.0V 07LJ38    645  C~2KuB      
2005 05  11.245965 16 10 11.93   +11 30 48.0   23.3V 07LJ38    645  C~2KuB      
2005 05  11.248453 16 10 11.93   +11 30 48.0   24.4V 07LJ38    645  C~2KuB      
2007 06  12.31694  16 21 45.25   +10 27 59.5   23.3r 07LJ38    568  C~1QdL      
2007 06  12.35740  16 21 45.06   +10 27 59.2   23.2r 07LJ38    568  C~1QdL      
2007 06  12.39798  16 21 44.86   +10 27 59.0   22.7r 07LJ38    568  C~1QdL      
2008 05  07.39670  16 31 42.77   +09 47 04.7   22.9r 07LJ38    568  C~1QdL      
2008 05  07.42593  16 31 42.66   +09 47 05.4   23.1r 07LJ38    568  C~1QdL      
2008 05  07.45536  16 31 42.50   +09 47 06.5   23.7r 07LJ38    568  C~1QdL      
2008 05  29.51909  16 29 55.65   +09 53 00.3   23.4r 07LJ38    568  C~1QdL      
2008 05  29.56203  16 29 55.43   +09 53 00.6   23.0r 07LJ38    568  C~1QdL      
2008 05  29.56466  16 29 55.41   +09 53 00.7   23.2r 07LJ38    568  C~1QdL      
2008 06  01.50624  16 29 40.68   +09 53 18.8   23.3r 07LJ38    568  C~1QdL      
2008 06  07.14778  16 29 12.57   +09 53 33.0   23.0  07LJ38    807  C~1QdL      
2008 06  07.29383  16 29 11.82   +09 53 33.0   23.0  07LJ38    807  C~1QdL      
2008 06  08.11565  16 29 07.76   +09 53 32.8         07LJ38    807  C~1QdL      
2008 06  08.19344  16 29 07.38   +09 53 32.8         07LJ38    807  C~1QdL      
2008 08  04.27040  16 25 43.22   +09 31 15.3         07LJ38    568  C~1QdL      
2008 08  04.30671  16 25 43.17   +09 31 13.8         07LJ38    568  C~1QdL      
2008 08  04.34168  16 25 43.12   +09 31 12.2         07LJ38    568  C~1QdL      
2009 06  20.25721  16 35 16.43   +09 17 15.0         07LJ38    695  C~1QdL      
2009 06  20.31172  16 35 16.17   +09 17 14.3         07LJ38    695  C~1QdL      
2009 06  21.24427  16 35 11.83   +09 17 04.7         07LJ38    695  C~1QdL      
2009 06  21.25229  16 35 11.79   +09 17 04.4         07LJ38    695  C~1QdL      
2015 05  22.32097  17 20 17.98   +05 31 52.3   23.3R 07LJ38    695  C~1hU4      
2015 05  22.38302  17 20 17.68   +05 31 53.1         07LJ38    695  C~1hU4      
2015 05  22.43525  17 20 17.44   +05 31 53.9         07LJ38    695  C~1hU4      

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    -0.11       0.00     0.10
  2   0.0000      0.00    -0.05       0.00     0.09
  3   0.0000      0.00     0.14       0.00     0.08
  4   2.0864  10799.09    -0.05   -1422.17    -0.09
  5   2.0865  10796.42     0.10   -1423.09    -0.19
  6   2.0867  10793.58     0.09   -1423.95    -0.22
  7   2.9901  20002.89    -0.33   -1792.46     0.00
  8   2.9902  20001.13     0.03   -1792.16     0.07
  9   2.9903  19998.55    -0.41   -1791.64     0.37
 10   3.0507  18366.31     0.22   -1813.85    -0.03
 11   3.0508  18363.05     0.20   -1814.32    -0.05
 12   3.0508  18362.74     0.08   -1814.29     0.01
 13   3.0589  18145.10     0.12   -1847.13     0.14
 14   3.0743  17734.63     0.27   -1929.54     0.09
 15   3.0747  17723.77     0.04   -1932.11     0.04
 16   3.0770  17665.02    -0.13   -1946.19     0.10
 17   3.0772  17659.52     0.01   -1947.49     0.20
 18   3.2335  15012.96    -0.15   -3947.47    -0.13
 19   3.2336  15012.58    -0.07   -3949.10    -0.05
 20   3.2337  15012.22     0.01   -3950.84    -0.13
 21   4.1095  23534.50    -0.11   -2800.01    -0.10
 22   4.1097  23530.88    -0.07   -2801.60    -0.24
 23   4.1122  23469.93     0.07   -2826.16     0.01
 24   4.1123  23469.42     0.09   -2826.60    -0.21
 25  10.0290  68046.86    -0.01   -6081.64     0.11
 26  10.0291  68041.83    -0.05   -6082.03    -0.03
 27  10.0293  68037.77     0.07   -6082.18     0.04

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.

07LJ38    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        71.583    71.634    71.532
ecceobj         0.464     0.465     0.464
incobj         31.545    31.545    31.545
qmin           37.483    37.550    37.462
qmax          109.192   109.194   109.189
amean          72.433    72.477    72.381
amin           71.513    71.542    71.460
amax           73.725    73.739    73.669
emean           0.464     0.464     0.464
emin            0.447     0.448     0.449
emax            0.482     0.481     0.482
imean          30.524    30.541    30.501
imin           29.848    29.868    29.852
imax           31.198    31.228    31.155
excite_mean     0.688     0.688     0.688
fracstop        1.000     1.000     1.000
cjmean          2.783     2.783     2.783

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       232.2     233.7     230.4
kozaiamp        115.2     116.7     113.7