Orbit Fit and Astrometric record for 13GB138

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: 13GB138   
# Created Wed Dec 13 02:37:53 2017
# Orbit generated from Bernstein formalism
# Fitting   31 observations of   31
# Arc:   1.89y
# First observation: 2013/03/07
#  Last observation: 2015/01/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000061   0.020698   0.000004   0.000821   0.022504   0.000000
# Chi-squared of fit:     9.18 DOF:   56 RMS:  0.10
# Min/Max residuals:    -0.28    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.561415E-05  2.071414E-02  1.917174E-06  8.199518E-04  2.259751E-02 -1.212061E-04
# Covariance matrix:
  2.0512E-13 -4.5763E-14 -1.6967E-15  4.8537E-15  1.7778E-13  3.6727E-12
 -4.5763E-14  3.8801E-13 -3.0779E-15  1.4851E-14  2.2240E-13  1.2105E-11
 -1.6967E-15 -3.0779E-15  1.1788E-13 -1.0830E-13 -4.4535E-15 -1.7053E-13
  4.8537E-15  1.4851E-14 -1.0830E-13  1.6598E-13  1.5973E-14  8.0898E-13
  1.7778E-13  2.2240E-13 -4.4535E-15  1.5973E-14  4.1310E-13  1.2550E-11
  3.6727E-12  1.2105E-11 -1.7053E-13  8.0898E-13  1.2550E-11  6.5820E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.604706 -141.886275    0.771702    0.017530   -0.624388  2456359.054538
# Heliocentric elements and errors
Epoch:              2456350.5000  =  2013/02/27
Mean Anomaly:          205.72955 +/-     1.205
Argument of Peri:      191.20475 +/-     1.205
Long of Asc Node:      182.60285 +/-     0.013
Inclination:             2.79043 +/-     0.001
Eccentricity:         0.05116326 +/-    0.0005
Semi-Major Axis:     42.88551888 +/-    0.0040
Time of Perihelion: 2500309.1836 +/-     343.4
Perihelion:          40.69135574 +/-    0.0215
Aphelion:            45.07968202 +/-    0.0215
Period (y)              280.8499 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.77023308 +/-    0.0010
Ecliptic Y          -27.07950330 +/-    0.0008
Ecliptic Z            1.23933762 +/-    0.0000
Ecliptic XDOT         0.00155651 +/-    0.0000
Ecliptic YDOT        -0.00196311 +/-    0.0000
Ecliptic ZDOT         0.00009903 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.88145532 +/-    0.0009
Geocenter to KBO     44.25266026 +/-    0.0013
# Hcoef:  7.31

The following table shows the complete astrometric record for 13GB138. 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 (13GB138) followed by the observatory code and reference code for the source of the astrometry.

2013 03  07.55376  14 25 06.132  -12 41 35.12  23.2r 13GB138   568  C~1XRa      
2013 03  07.61085  14 25 06.001  -12 41 34.19  23.5r 13GB138   568  C~1XRa      
2013 04  04.55473  14 23 34.341  -12 33 03.96        13GB138   568  C~1XRa      
2013 04  07.41499  14 23 22.814  -12 32 02.20  23.2r 13GB138   568  C~1XRa      
2013 04  07.45875  14 23 22.631  -12 32 01.41  23.5r 13GB138   568  C~1XRa      
2013 04  08.44736  14 23 18.589  -12 31 39.73  23.8r 13GB138   568  C~1XRa      
2013 04  08.49256  14 23 18.386  -12 31 38.94  23.3r 13GB138   568  C~1XRa      
2013 04  09.39399  14 23 14.677  -12 31 19.12  23.6r 13GB138   568  C~1XRa      
2013 04  09.43719  14 23 14.495  -12 31 18.20  23.5r 13GB138   568  C~1XRa      
2013 04  09.48059  14 23 14.310  -12 31 17.01  23.7r 13GB138   568  C~1XRa      
2013 05  11.48217  14 20 55.323  -12 19 20.28  23.8r 13GB138   568  C~1XRa      
2013 05  12.48442  14 20 51.044  -12 18 58.83  23.6r 13GB138   568  C~1XRa      
2013 06  12.37957  14 18 57.296  -12 09 43.78  23.6r 13GB138   568  C~1XRa      
2013 06  12.42509  14 18 57.163  -12 09 43.05  24.0r 13GB138   568  C~1XRa      
2013 08  05.27533  14 18 09.043  -12 07 06.25  24.1r 13GB138   568  C~1XRa      
2014 02  24.60122  14 30 07.816  -13 03 47.20  23.9r 13GB138   568  C~1XRa      
2014 02  25.58427  14 30 06.356  -13 03 37.49  23.6r 13GB138   568  C~1XRa      
2014 02  28.53222  14 30 01.493  -13 03 06.00  23.7r 13GB138   568  C~1XRa      
2014 03  28.44948  14 28 44.249  -12 55 46.79  23.8r 13GB138   568  C~1XRa      
2014 03  28.48858  14 28 44.097  -12 55 46.08  23.6r 13GB138   568  C~1XRa      
2014 04  04.42723  14 28 17.853  -12 53 26.10  23.6r 13GB138   568  C~1XRa      
2014 04  04.46649  14 28 17.692  -12 53 25.29  23.6r 13GB138   568  C~1XRa      
2014 04  05.42266  14 28 13.934  -12 53 05.14  23.8r 13GB138   568  C~1XRa      
2014 04  05.42769  14 28 13.904  -12 53 05.16  23.7r 13GB138   568  C~1XRa      
2014 04  05.54119  14 28 13.444  -12 53 02.67  23.6r 13GB138   568  C~1XRa      
2014 05  22.43816  14 24 52.580  -12 36 07.78  23.6r 13GB138   568  C~1XRa      
2014 05  25.37427  14 24 40.933  -12 35 11.44  23.7r 13GB138   568  C~1XRa      
2014 05  25.37889  14 24 40.911  -12 35 11.22  24.0r 13GB138   568  C~1XRa      
2014 05  25.38376  14 24 40.883  -12 35 11.19  23.9r 13GB138   568  C~1XRa      
2014 05  25.40152  14 24 40.815  -12 35 10.77  23.8r 13GB138   568  C~1XRa      
2015 01  26.64799  14 34 50.386  -13 24 58.53  24.0r 13GB138   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    -0.23       0.00    -0.28
  2   0.0002     -2.11    -0.11       0.27    -0.12
  3   0.0767  -1436.62     0.23      52.06    -0.06
  4   0.0845  -1616.31    -0.01      56.13     0.09
  5   0.0846  -1619.10     0.03      56.02    -0.06
  6   0.0873  -1682.12     0.08      57.46     0.11
  7   0.0874  -1685.18    -0.04      57.25    -0.14
  8   0.0899  -1742.99    -0.01      58.50    -0.05
  9   0.0900  -1745.81    -0.00      58.51    -0.07
 10   0.0901  -1748.76    -0.10      58.76     0.15
 11   0.1778  -3907.57     0.02      78.27     0.06
 12   0.1805  -3973.86    -0.03      78.21     0.02
 13   0.2651  -5732.15     0.09      60.39     0.06
 14   0.2652  -5734.23     0.09      60.44     0.17
 15   0.4127  -6453.03    -0.08     -21.87     0.02
 16   0.9693   4606.72     0.02     142.36     0.04
 17   0.9720   4583.40     0.06     144.82     0.03
 18   0.9801   4505.99     0.04     152.23     0.09
 19   1.0565   3295.56     0.07     211.06     0.09
 20   1.0566   3293.22    -0.02     211.02     0.01
 21   1.0756   2884.83     0.02     221.85    -0.05
 22   1.0757   2882.34    -0.03     221.87    -0.07
 23   1.0784   2823.82     0.14     223.51     0.19
 24   1.0784   2823.41     0.05     223.35     0.03
 25   1.0787   2816.24     0.01     223.57     0.13
 26   1.2071   -292.90     0.03     246.38    -0.07
 27   1.2151   -472.47     0.05     244.99    -0.09
 28   1.2151   -472.84    -0.04     245.09     0.02
 29   1.2151   -473.24    -0.14     244.99    -0.08
 30   1.2152   -474.32    -0.12     245.06     0.01
 31   1.8894   8927.93    -0.08     230.73    -0.17

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.

13GB138    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.740    42.751    42.730
ecceobj         0.055     0.056     0.055
incobj          2.797     2.797     2.797
qmin           39.468    39.492    39.501
qmax           46.762    46.764    46.779
amean          43.039    43.049    43.028
amin           42.702    42.719    42.693
amax           43.384    43.405    43.388
emean           0.061     0.061     0.061
emin            0.040     0.040     0.041
emax            0.078     0.078     0.078
imean           4.005     4.001     4.009
imin            2.819     2.819     2.819
imax            4.867     4.865     4.870
excite_mean     0.093     0.093     0.093
fracstop        1.000     1.000     1.000
cjmean          3.079     3.080     3.079

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       181.2     180.9     181.1
kozaiamp        180.0     180.0     179.9