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 Sat Oct  8 01:12:48 2022
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     31 observations of     31
# Arc:  17.15y
# First observation: 2005/05/11
#  Last observation: 2022/07/04
# Chi-squared of fit:    21.92 DOF:     56 RMS:  0.15
# Min/Max residuals:    -0.42    0.47
# Exact a, adot, b, bdot, g, gdot:
  1.890690E-05  3.145523E-02 -2.008532E-06 -2.831714E-03  2.614681E-02 -3.386133E-03
# Covariance matrix:
  3.0780E-13 -7.5841E-14 -7.8023E-15  6.6304E-15  1.2871E-13 -1.1586E-13
 -7.5841E-14  2.9875E-14  6.4114E-15 -2.6566E-15  4.3579E-15  4.7188E-14
 -7.8023E-15  6.4114E-15  1.0031E-13 -1.0173E-14  1.9675E-14  1.0093E-14
  6.6304E-15 -2.6566E-15 -1.0173E-14  1.9768E-15  5.6693E-16 -4.4872E-15
  1.2871E-13  4.3579E-15  1.9675E-14  5.6693E-16  3.5731E-13 -5.1686E-15
 -1.1586E-13  4.7188E-14  1.0093E-14 -4.4872E-15 -5.1686E-15  7.9534E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
   31.938912 -122.159929    0.124412    0.528639   -0.847867  2453501.745879
# Heliocentric elements and errors
Epoch:              2453502.5000  =  2005/05/12
Mean Anomaly:          353.91901 +/-     0.002
Argument of Peri:      117.62800 +/-     0.003
Long of Asc Node:      137.72645 +/-     0.000
Inclination:            31.54353 +/-     0.000
Eccentricity:         0.47476440 +/-    0.0001
Semi-Major Axis:     73.11318016 +/-    0.0153
Time of Perihelion: 2457359.6261 +/-      70.3
Perihelion:          38.40164480 +/-    0.0107
Aphelion:           107.82471553 +/-    0.0236
Period (y)              625.1752 +/-      0.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -17.91651922 +/-    0.0004
Ecliptic Y          -28.25656102 +/-    0.0006
Ecliptic Z           20.23245224 +/-    0.0005
Ecliptic XDOT         0.00286567 +/-    0.0000
Ecliptic YDOT        -0.00163832 +/-    0.0000
Ecliptic ZDOT        -0.00043914 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.09978466 +/-    0.0005
Geocenter to KBO     38.24569845 +/-    0.0009
# Hcoef:  7.27

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      
2019 06  06.361840 17 47 23.411  +02 57 27.51  23.0G 07LJ38    G37  C~36kc      
2019 06  06.403300 17 47 23.198  +02 57 27.70        07LJ38    G37  C~36kc      
2022 07  04.317150 18 06 04.465  +00 57 04.76  22.9G 07LJ38    G37  C~5i1b      
2022 07  04.383120 18 06 04.135  +00 57 03.75        07LJ38    G37  C~5i1b      

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     0.04       0.00     0.05
     2   0.0000      0.00     0.10       0.00     0.04
     3   0.0000      0.00     0.28       0.00    -0.02
     4   2.0864      0.00    -0.06       0.00    -0.09
     5   2.0865      0.00     0.06       0.00    -0.22
     6   2.0867      0.00     0.05       0.00    -0.25
     7   2.9901      0.00    -0.42       0.00     0.10
     8   2.9902      0.00    -0.04       0.00     0.09
     9   2.9903      0.00    -0.40       0.00     0.47
    10   3.0507      0.00     0.15       0.00    -0.07
    11   3.0508      0.00     0.12       0.00    -0.08
    12   3.0508      0.00     0.02       0.00     0.00
    13   3.0589      0.00     0.10       0.00     0.12
    14   3.0743      0.00     0.24       0.00     0.04
    15   3.0747      0.00     0.01       0.00     0.05
    16   3.0770      0.00    -0.15       0.00     0.14
    17   3.0772      0.00     0.01       0.00     0.20
    18   3.2335      0.00    -0.16       0.00    -0.06
    19   3.2336      0.00    -0.06       0.00    -0.00
    20   3.2337      0.00    -0.00       0.00    -0.10
    21   4.1095      0.00    -0.19       0.00    -0.04
    22   4.1097      0.00    -0.19       0.00    -0.19
    23   4.1122      0.00     0.01       0.00     0.02
    24   4.1123      0.00    -0.02       0.00    -0.19
    25  10.0290      0.00     0.19       0.00     0.07
    26  10.0291      0.00     0.12       0.00    -0.05
    27  10.0293      0.00     0.24       0.00    -0.02
    28  14.0701      0.00     0.01       0.00    -0.07
    29  14.0702      0.00    -0.08       0.00    -0.06
    30  17.1474      0.00    -0.05       0.00     0.09
    31  17.1475      0.00    -0.06       0.00     0.02

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        71.572    71.572    71.573
ecceobj         0.464     0.464     0.464
incobj         31.545    31.545    31.545
qmin           37.454    37.464    37.507
qmax          109.123   109.238   109.123
amean          72.419    72.421    72.421
amin           71.525    71.477    71.501
amax           73.694    73.759    73.697
emean           0.464     0.464     0.464
emin            0.448     0.448     0.448
emax            0.481     0.481     0.481
imean          30.522    30.522    30.522
imin           29.866    29.852    29.854
imax           31.194    31.194    31.192
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       231.9     231.9     232.0
kozaiamp        115.1     114.9     115.0