Orbit Fit and Astrometric record for 13GD138

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: 13GD138   
# Created Mon Dec 18 02:37:54 2017
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   27
# Arc:   1.89y
# First observation: 2013/03/07
#  Last observation: 2015/01/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000112   0.027288  -0.000001  -0.002449   0.025787   0.000000
# Chi-squared of fit:    12.43 DOF:   48 RMS:  0.12
# Min/Max residuals:    -0.33    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.830743E-05  2.746353E-02 -2.963034E-08 -2.470035E-03  2.602612E-02  1.202214E-03
# Covariance matrix:
  1.7900E-13 -6.5386E-14  6.2096E-16 -6.6928E-15  1.1675E-13  2.0567E-12
 -6.5386E-14  5.1521E-13  6.0749E-15 -4.2234E-14  2.2661E-13  1.1621E-11
  6.2096E-16  6.0749E-15  1.2111E-13 -1.1524E-13  3.8140E-15  2.2015E-13
 -6.6928E-15 -4.2234E-14 -1.1524E-13  2.0255E-13 -3.0370E-14 -1.5431E-12
  1.1675E-13  2.2661E-13  3.8140E-15 -3.0370E-14  2.9409E-13  8.7053E-12
  2.0567E-12  1.1621E-11  2.2015E-13 -1.5431E-12  8.7053E-12  4.2572E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.873788 -141.682654    0.773917    0.020373   -0.621554  2456359.054538
# Heliocentric elements and errors
Epoch:              2456350.5000  =  2013/02/27
Mean Anomaly:           11.56388 +/-     0.320
Argument of Peri:      145.53188 +/-     0.407
Long of Asc Node:       56.98329 +/-     0.003
Inclination:             5.42762 +/-     0.001
Eccentricity:         0.11216853 +/-    0.0002
Semi-Major Axis:     43.84059766 +/-    0.0042
Time of Perihelion: 2452944.7386 +/-      94.3
Perihelion:          38.92306235 +/-    0.0111
Aphelion:            48.75813296 +/-    0.0115
Period (y)              290.2839 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.09654044 +/-    0.0006
Ecliptic Y          -23.58652863 +/-    0.0005
Ecliptic Z            1.25636251 +/-    0.0000
Ecliptic XDOT         0.00167917 +/-    0.0000
Ecliptic YDOT        -0.00234968 +/-    0.0000
Ecliptic ZDOT        -0.00025543 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.04993735 +/-    0.0006
Geocenter to KBO     38.42294273 +/-    0.0008
# Hcoef:  8.15

The following table shows the complete astrometric record for 13GD138. 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 (13GD138) followed by the observatory code and reference code for the source of the astrometry.

2013 03  07.55376  14 26 14.739  -12 30 12.08  23.7r 13GD138   568  C~1XRa      
2013 03  07.61085  14 26 14.605  -12 30 10.98  23.5r 13GD138   568  C~1XRa      
2013 04  04.55473  14 24 32.009  -12 21 28.83  23.8r 13GD138   568  C~1XRa      
2013 04  07.41499  14 24 19.022  -12 20 24.93  23.8r 13GD138   568  C~1XRa      
2013 04  07.45875  14 24 18.827  -12 20 23.87  23.7r 13GD138   568  C~1XRa      
2013 04  08.44736  14 24 14.240  -12 20 01.65  23.7r 13GD138   568  C~1XRa      
2013 04  08.49256  14 24 14.034  -12 20 00.46  23.3r 13GD138   568  C~1XRa      
2013 04  09.39399  14 24 09.861  -12 19 39.85  24.5r 13GD138   568  C~1XRa      
2013 04  09.43719  14 24 09.651  -12 19 39.00        13GD138   568  C~1XRa      
2013 04  09.48059  14 24 09.431  -12 19 37.88  23.9r 13GD138   568  C~1XRa      
2013 06  12.37957  14 19 18.960  -11 57 33.97  24.1r 13GD138   568  C~1XRa      
2013 06  12.42509  14 19 18.781  -11 57 33.53  23.7r 13GD138   568  C~1XRa      
2013 07  04.33899  14 18 26.315  -11 54 33.46  23.8r 13GD138   568  C~1XRa      
2013 07  06.34710  14 18 23.561  -11 54 28.06  23.7r 13GD138   568  C~1XRa      
2013 08  02.27448  14 18 23.541  -11 56 25.33  24.1r 13GD138   568  C~1XRa      
2014 02  01.65290  14 32 41.701  -13 11 20.80  24.1r 13GD138   568  C~1XRa      
2014 02  02.65647  14 32 42.443  -13 11 23.07  24.9r 13GD138   568  C~1XRa      
2014 02  03.59530  14 32 43.090  -13 11 24.52  23.8r 13GD138   568  C~1XRa      
2014 02  24.60122  14 32 33.206  -13 10 08.52  24.3r 13GD138   568  C~1XRa      
2014 02  25.58427  14 32 31.675  -13 09 59.94  24.6r 13GD138   568  C~1XRa      
2014 02  28.53222  14 32 26.503  -13 09 31.86  24.0r 13GD138   568  C~1XRa      
2014 04  04.42723  14 30 31.727  -12 59 58.64  24.0r 13GD138   568  C~1XRa      
2014 04  05.54119  14 30 26.769  -12 59 34.82  23.8r 13GD138   568  C~1XRa      
2014 05  22.43816  14 26 39.549  -12 42 09.63  23.7r 13GD138   568  C~1XRa      
2014 06  26.34216  14 24 34.862  -12 33 45.94  24.1r 13GD138   568  C~1XRa      
2014 07  18.30511  14 24 05.295  -12 32 47.12        13GD138   568  C~1XRa      
2015 01  26.64799  14 38 25.625  -13 47 36.25  24.3r 13GD138   568  C~1XRa      

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    -0.33       0.00    -0.30
  2   0.0002     -2.21    -0.10       0.41     0.08
  3   0.0767  -1593.18     0.02      13.46     0.05
  4   0.0845  -1793.93    -0.02      12.83    -0.03
  5   0.0846  -1796.97     0.10      12.91     0.09
  6   0.0873  -1867.77    -0.11      12.35    -0.17
  7   0.0874  -1871.01    -0.05      12.51     0.02
  8   0.0899  -1935.55     0.16      12.36     0.15
  9   0.0900  -1938.74     0.14      12.18     0.01
 10   0.0901  -1942.15    -0.08      12.20     0.07
 11   0.2651  -6402.93     0.16    -113.77     0.11
 12   0.2652  -6405.56    -0.17    -114.21    -0.16
 13   0.3252  -7193.03     0.09    -195.14     0.12
 14   0.3307  -7233.04     0.14    -203.24     0.03
 15   0.4044  -7194.98    -0.04    -314.24     0.13
 16   0.9065   6151.50     0.09    -549.34    -0.06
 17   0.9092   6162.51    -0.12    -548.10    -0.21
 18   0.9118   6171.95     0.21    -546.51     0.05
 19   0.9693   6010.89     0.01    -519.63     0.06
 20   0.9720   5986.95     0.10    -518.50     0.09
 21   0.9801   5906.34     0.07    -515.55    -0.10
 22   1.0756   4133.11     0.03    -499.46    -0.03
 23   1.0787   4056.80    -0.00    -499.75     0.02
 24   1.2071    573.40     0.06    -563.91    -0.12
 25   1.3026  -1316.85    -0.03    -671.19     0.10
 26   1.3628  -1745.71    -0.20    -754.63    -0.08
 27   1.8894  11606.25    -0.11   -1057.83     0.10

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.

13GD138    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.663    43.678    43.648
ecceobj         0.108     0.109     0.108
incobj          5.431     5.431     5.431
qmin           38.108    38.196    38.279
qmax           50.122    50.117    49.987
amean          44.008    44.007    43.985
amin           43.646    43.648    43.613
amax           44.402    44.399    44.369
emean           0.111     0.111     0.108
emin            0.094     0.093     0.091
emax            0.129     0.129     0.127
imean           3.928     3.939     3.875
imin            3.042     3.040     3.029
imax            4.829     4.923     4.737
excite_mean     0.131     0.131     0.128
fracstop        1.000     1.000     1.000
cjmean          3.081     3.081     3.082

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       182.3     182.8     182.8
kozaiamp        180.0     179.9     179.9