Orbit Fit and Astrometric record for 07LG38

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: 07LG38    
# Created Tue Oct 24 01:37:41 2017
# Orbit generated from Bernstein formalism
# Fitting   41 observations of   41
# Arc:  10.03y
# First observation: 2005/05/12
#  Last observation: 2015/05/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.001113   0.042374   0.000534  -0.002339   0.032831   0.000000
# Chi-squared of fit:    54.56 DOF:   76 RMS:  0.20
# Min/Max residuals:    -0.57    0.42
# Exact a, adot, b, bdot, g, gdot:
  2.076511E-05  4.247758E-02 -1.050446E-06 -2.416811E-03  3.218967E-02  4.298092E-03
# Covariance matrix:
  1.9378E-13 -8.2216E-14  3.8967E-16  3.1464E-15  7.7264E-15 -1.5180E-13
 -8.2216E-14  5.8794E-14  1.1812E-14 -3.0649E-15  3.9751E-14  1.2707E-13
  3.8967E-16  1.1812E-14  1.0927E-13 -2.3846E-14  4.0281E-14  2.8855E-14
  3.1464E-15 -3.0649E-15 -2.3846E-14  8.7150E-15 -3.4426E-15 -7.7139E-15
  7.7264E-15  3.9751E-14  4.0281E-14 -3.4426E-15  1.4940E-13  9.6657E-14
 -1.5180E-13  1.2707E-13  2.8855E-14 -7.7139E-15  9.6657E-14  3.2132E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   33.443333 -124.502680    0.063585    0.554023   -0.838714  2453502.915789
# Heliocentric elements and errors
Epoch:              2453500.5000  =  2005/05/10
Mean Anomaly:            6.69314 +/-     0.001
Argument of Peri:       75.91835 +/-     0.003
Long of Asc Node:      139.55438 +/-     0.000
Inclination:            32.57906 +/-     0.000
Eccentricity:         0.44013319 +/-    0.0000
Semi-Major Axis:     56.05261534 +/-    0.0051
Time of Perihelion: 2450650.6665 +/-       0.4
Perihelion:          31.38199900 +/-    0.0038
Aphelion:            80.72323167 +/-    0.0078
Period (y)              419.6643 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -15.30911497 +/-    0.0002
Ecliptic Y          -22.15595273 +/-    0.0003
Ecliptic Z           17.12078439 +/-    0.0002
Ecliptic XDOT         0.00274109 +/-    0.0000
Ecliptic YDOT        -0.00239830 +/-    0.0000
Ecliptic ZDOT         0.00003000 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   31.91201186 +/-    0.0002
Geocenter to KBO     31.06586286 +/-    0.0004
# Hcoef:  7.88

The following table shows the complete astrometric record for 07LG38. 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 (07LG38) followed by the observatory code and reference code for the source of the astrometry.

2005 05  12.415046 16 03 42.39   +13 25 15.1         07LG38    645  C~1rRH      
2005 05  12.415463 16 03 42.38   +13 25 15.1         07LG38    645  C~1rRH      
2005 05  12.415880 16 03 42.38   +13 25 15.2         07LG38    645  C~1rRH      
2005 05  12.416296 16 03 42.38   +13 25 15.2         07LG38    645  C~1rRH      
2005 05  14.324675 16 03 31.17   +13 25 58.8   22.9V 07LG38    645  C~1S6z      
2005 05  14.325504 16 03 31.17   +13 25 58.8   22.7V 07LG38    645  C~1S6z      
2005 05  14.327992 16 03 31.13   +13 25 58.8   23.3V 07LG38    645  C~1S6z      
2007 06  12.31068  16 19 41.24   +12 04 26.5   22.8r 07LG38    568  C~1QdL      
2007 06  12.35111  16 19 40.99   +12 04 26.2   23.1r 07LG38    568  C~1QdL      
2007 06  12.39169  16 19 40.75   +12 04 26.0   22.9r 07LG38    568  C~1QdL      
2007 07  27.35903  16 16 26.42   +11 42 30.1   22.8r 07LG38    568  C~1QdL      
2007 07  27.38536  16 16 26.36   +11 42 29.0   22.8r 07LG38    568  C~1QdL      
2007 07  27.40293  16 16 26.32   +11 42 28.0   23.0r 07LG38    568  C~1QdL      
2007 09  11.18435  16 16 41.28   +10 56 06.6   22.3r 07LG38    695  C~1QdL      
2007 09  16.16195  16 16 58.12   +10 50 35.1         07LG38    675  C~1QdL      
2007 09  17.12940  16 17 01.73   +10 49 30.8         07LG38    675  C~1QdL      
2007 09  17.13912  16 17 01.74   +10 49 30.4         07LG38    675  C~1QdL      
2007 09  17.14418  16 17 01.77   +10 49 30.0         07LG38    675  C~1QdL      
2007 09  17.14902  16 17 01.78   +10 49 29.8         07LG38    675  C~1QdL      
2007 10  07.21790  16 18 39.47   +10 27 57.7         07LG38    568  C~1QdL      
2007 10  07.23209  16 18 39.59   +10 27 56.8         07LG38    568  C~1QdL      
2007 10  07.24624  16 18 39.66   +10 27 55.7         07LG38    568  C~1QdL      
2008 05  03.39735  16 32 42.70   +11 11 29.7         07LG38    695  C~1QdL      
2008 05  03.40223  16 32 42.68   +11 11 29.9         07LG38    695  C~1QdL      
2008 05  04.38103  16 32 37.62   +11 12 01.8         07LG38    695  C~1QdL      
2008 05  07.39140  16 32 21.72   +11 13 35.7   23.1r 07LG38    568  C~1QdL      
2008 05  07.42058  16 32 21.57   +11 13 36.6   23.0r 07LG38    568  C~1QdL      
2008 05  07.45007  16 32 21.40   +11 13 37.4   22.9r 07LG38    568  C~1QdL      
2008 05  29.55925  16 30 14.38   +11 20 44.2   23.1r 07LG38    568  C~1QdL      
2008 05  29.60410  16 30 14.11   +11 20 44.5         07LG38    568  C~1QdL      
2008 05  29.60673  16 30 14.10   +11 20 44.5         07LG38    568  C~1QdL      
2008 06  08.17127  16 29 17.49   +11 21 16.5         07LG38    807  C~1QdL      
2008 06  08.22061  16 29 17.18   +11 21 16.2         07LG38    807  C~1QdL      
2008 08  04.27899  16 25 17.69   +10 52 54.1         07LG38    568  C~1QdL      
2008 08  04.31532  16 25 17.63   +10 52 52.1         07LG38    568  C~1QdL      
2008 08  04.35028  16 25 17.58   +10 52 50.2         07LG38    568  C~1QdL      
2009 06  20.27071  16 37 17.38   +10 36 00.9         07LG38    695  C~1QdL      
2009 06  20.36429  16 37 16.82   +10 36 00.0         07LG38    695  C~1QdL      
2009 06  22.31601  16 37 06.10   +10 35 32.2         07LG38    695  C~1QdL      
2015 05  22.38609  17 31 29.99   +06 07 00.2   22.9R 07LG38    695  C~1hU4      
2015 05  22.43850  17 31 29.73   +06 07 01.2         07LG38    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     0.02       0.00    -0.03
  2   0.0000     -0.14    -0.08      -0.03    -0.06
  3   0.0000     -0.17    -0.07       0.06     0.03
  4   0.0000     -0.17    -0.03       0.06     0.03
  5   0.0052   -169.37     0.11       4.61    -0.27
  6   0.0052   -169.37     0.19       4.61    -0.27
  7   0.0052   -169.94    -0.15       4.47    -0.41
  8   2.0832  14805.95     0.24   -1353.77     0.33
  9   2.0833  14802.45     0.04   -1354.97     0.23
 10   2.0834  14799.07    -0.02   -1356.03     0.28
 11   2.2066  12345.93    -0.28   -3334.26     0.12
 12   2.2066  12345.34    -0.27   -3335.54     0.33
 13   2.2067  12345.01    -0.20   -3336.66     0.22
 14   2.3320  13240.73     0.02   -5988.02    -0.03
 15   2.3456  13563.75     0.33   -6250.28     0.12
 16   2.3483  13631.36     0.41   -6299.92     0.11
 17   2.3483  13631.60    -0.02   -6300.27     0.26
 18   2.3483  13632.13     0.15   -6300.55     0.24
 19   2.3483  13632.32     0.01   -6300.71     0.33
 20   2.4033  15354.75    -0.41   -7207.28    -0.41
 21   2.4033  15356.70     0.13   -7207.73    -0.31
 22   2.4034  15357.98     0.01   -7208.55    -0.57
 23   2.9760  26841.98    -0.12   -1536.45    -0.14
 24   2.9760  26841.64    -0.05   -1536.33    -0.08
 25   2.9787  26760.11    -0.01   -1524.56    -0.18
 26   2.9869  26505.68    -0.18   -1493.74     0.27
 27   2.9870  26503.27    -0.06   -1493.43     0.33
 28   2.9871  26500.61    -0.16   -1493.30     0.22
 29   3.0476  24555.83     0.16   -1559.98    -0.03
 30   3.0477  24551.86     0.17   -1560.71    -0.09
 31   3.0478  24551.71     0.26   -1560.75    -0.09
 32   3.0739  23727.51     0.07   -1743.25    -0.02
 33   3.0741  23723.13    -0.11   -1744.71    -0.29
 34   3.2303  20710.26    -0.19   -4295.83     0.01
 35   3.2304  20709.90    -0.13   -4298.00    -0.02
 36   3.2305  20709.67     0.03   -4300.04    -0.00
 37   4.1064  31391.74     0.42   -2555.36     0.00
 38   4.1066  31383.83    -0.15   -2558.42     0.20
 39   4.1120  31235.22    -0.06   -2627.18    -0.14
 40  10.0259  86622.07    -0.13   -4770.13    -0.21
 41  10.0261  86617.36     0.11   -4770.32    -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.

07LG38    quality flag:3

Type:         5:2EEE    5:2EEE    5:2EEE

axisobj        54.920    54.935    54.905
ecceobj         0.429     0.429     0.429
incobj         32.588    32.588    32.588
qmin           30.843    30.857    30.819
qmax           81.220    81.223    81.277
amean          55.460    55.460    55.460
amin           54.827    54.793    54.782
amax           56.306    56.309    56.340
emean           0.419     0.413     0.416
emin            0.376     0.358     0.366
emax            0.443     0.442     0.444
imean          31.996    32.246    32.100
imin           31.118    31.125    31.115
imax           33.693    34.342    34.099
excite_mean     0.675     0.675     0.675
fracstop        1.000     1.000     1.000
cjmean          2.633     2.633     2.633

libcent 0       181.0     180.5     180.8
libamp  0        50.6      59.7      60.1
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        55.4      55.0      56.1
kozaiamp         23.2      25.5      23.2