Orbit Fit and Astrometric record for 500877

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: 500877    
# Created Sat Dec 16 02:36:55 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   36 observations of   36
# Arc:   4.06y
# First observation: 2013/04/09
#  Last observation: 2017/05/02
# Chi-squared of fit:    14.89 DOF:   66 RMS:  0.11
# Min/Max residuals:    -0.23    0.62
# Exact a, adot, b, bdot, g, gdot:
  1.786174E-05  3.249352E-02 -2.266248E-06 -3.118499E-03  2.834237E-02  5.531428E-03
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
    6.559974 -122.044484    0.620319    0.090098   -0.783308  2456392.027708
# Heliocentric elements and errors
Epoch:              2456392.5000  =  2013/04/10
Mean Anomaly:           22.76159 +/-     0.000
Argument of Peri:       88.65272 +/-     0.000
Long of Asc Node:      107.02683 +/-     0.000
Inclination:             8.34381 +/-     0.000
Eccentricity:         0.28400911 +/-    0.0000
Semi-Major Axis:     47.64532146 +/-    0.0000
Time of Perihelion: 2448797.4807 +/-       0.0
Perihelion:          34.11361613 +/-    0.0000
Aphelion:            61.17702678 +/-    0.0000
Period (y)              328.8809 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -19.54067780 +/-    0.0000
Ecliptic Y          -30.04824560 +/-    0.0000
Ecliptic Z            4.03078148 +/-    0.0000
Ecliptic XDOT         0.00235439 +/-    0.0000
Ecliptic YDOT        -0.00214417 +/-    0.0000
Ecliptic ZDOT        -0.00023809 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.06903467 +/-    0.0000
Geocenter to KBO     35.28277877 +/-    0.0000
# Hcoef:  8.30

The following table shows the complete astrometric record for 500877. 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 (500877) followed by the observatory code and reference code for the source of the astrometry.

2013 04  09.52693  15 48 49.056  -13 18 20.58  23.7r 500877    568  C~1XRc      
2013 04  10.49580  15 48 45.249  -13 18 02.93  23.5r 500877    568  C~1XRc      
2013 04  10.53608  15 48 45.070  -13 18 02.14  23.5r 500877    568  C~1XRc      
2013 05  04.42521  15 46 53.071  -13 10 35.59  23.8r 500877    568  C~1XRc      
2013 05  07.42802  15 46 37.205  -13 09 41.00  23.4r 500877    568  C~1XRc      
2013 05  07.47225  15 46 36.955  -13 09 40.11  23.4r 500877    568  C~1XRc      
2013 05  07.51247  15 46 36.746  -13 09 39.43  23.9r 500877    568  C~1XRc      
2013 05  09.47229  15 46 26.267  -13 09 04.26  23.6r 500877    568  C~1XRc      
2013 05  10.47981  15 46 20.846  -13 08 46.37  23.2r 500877    568  C~1XRc      
2013 06  01.38796  15 44 22.083  -13 03 02.02  23.6r 500877    568  C~1XRc      
2013 06  02.39467  15 44 16.761  -13 02 49.14  23.6r 500877    568  C~1XRc      
2014 03  06.58112  15 57 19.802  -14 00 30.92  23.7r 500877    568  C~1XRc      
2014 04  30.53172  15 54 33.344  -13 46 19.42        500877    568  C~1XRc      
2014 05  05.49140  15 54 07.949  -13 44 52.16  23.8r 500877    568  C~1XRc      
2014 05  06.42350  15 54 03.084  -13 44 36.14  23.9r 500877    568  C~1XRc      
2014 05  06.43939  15 54 03.003  -13 44 35.85  23.7r 500877    568  C~1XRc      
2014 05  06.49023  15 54 02.727  -13 44 35.01  23.6r 500877    568  C~1XRc      
2014 05  06.56630  15 54 02.319  -13 44 33.59  23.6r 500877    568  C~1XRc      
2014 05  22.54556  15 52 36.107  -13 40 12.72  23.7r 500877    568  C~1XRc      
2014 05  25.50454  15 52 19.946  -13 39 29.01  24.1r 500877    568  C~2LSW      
2014 07  01.37930  15 49 20.575  -13 33 41.16  23.6r 500877    568  C~1XRc      
2014 07  18.35698  15 48 26.553  -13 33 38.15  23.8r 500877    568  C~1XRc      
2014 07  26.28482  15 48 10.242  -13 34 15.33  23.9r 500877    568  C~1XRc      
2015 03  22.59524  16 04 11.743  -14 29 53.00  23.4r 500877    568  C~2LSW      
2015 08  11.32212  15 55 04.819  -14 10 03.40  23.9r 500877    568  C~2LSW      
2015 08  11.32974  15 55 04.831  -14 10 03.47  23.9r 500877    568  C~2LSW      
2016 05  07.49747  16 08 27.078  -14 49 48.70  23.7r 500877    568  C~2LSW      
2016 05  11.46052  16 08 06.339  -14 48 48.48  23.7r 500877    568  C~2LSW      
2016 05  11.48265  16 08 06.213  -14 48 48.24        500877    568  C~2LSW      
2016 05  11.52621  16 08 05.981  -14 48 47.32  23.5r 500877    568  C~2LSW      
2017 01  31.66055  16 17 28.006  -15 35 20.19  25.1w 500877    568  C~2LSW      
2017 01  31.66166  16 17 28.013  -15 35 20.34  24.9w 500877    568  C~2LSW      
2017 02  03.65691  16 17 39.298  -15 35 27.67        500877    568  C~2LSW      
2017 03  30.60077  16 18 10.657  -15 29 52.24  23.9w 500877    568  C~2LSW      
2017 05  02.38122  16 16 06.60   -15 22 09.7   23.9R 500877    G37  C~2Fa2      
2017 05  02.44632  16 16 06.28   -15 22 08.9         500877    G37  C~2Fa2      

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    -0.21       0.00     0.62
  2   0.0027      0.00     0.09       0.00    -0.00
  3   0.0028      0.00    -0.14       0.00     0.05
  4   0.0682      0.00     0.20       0.00     0.02
  5   0.0764      0.00     0.11       0.00    -0.07
  6   0.0765      0.00    -0.05       0.00     0.02
  7   0.0766      0.00     0.09       0.00    -0.03
  8   0.0820      0.00     0.03       0.00    -0.01
  9   0.0847      0.00     0.01       0.00    -0.02
 10   0.1447      0.00     0.16       0.00     0.08
 11   0.1475      0.00     0.15       0.00    -0.23
 12   0.9064      0.00    -0.06       0.00    -0.07
 13   1.0568      0.00     0.07       0.00    -0.06
 14   1.0704      0.00     0.12       0.00     0.11
 15   1.0730      0.00     0.08       0.00    -0.05
 16   1.0730      0.00     0.14       0.00    -0.03
 17   1.0731      0.00     0.07       0.00    -0.07
 18   1.0733      0.00     0.04       0.00     0.02
 19   1.1171      0.00     0.07       0.00     0.09
 20   1.1252      0.00     0.02       0.00     0.07
 21   1.2262      0.00    -0.01       0.00    -0.09
 22   1.2726      0.00    -0.02       0.00     0.00
 23   1.2943      0.00    -0.00       0.00    -0.03
 24   1.9495      0.00     0.03       0.00     0.02
 25   2.3376      0.00    -0.10       0.00    -0.01
 26   2.3376      0.00     0.11       0.00    -0.00
 27   3.0773      0.00     0.03       0.00    -0.01
 28   3.0881      0.00     0.13       0.00    -0.12
 29   3.0882      0.00     0.03       0.00    -0.21
 30   3.0883      0.00     0.08       0.00     0.05
 31   3.8142      0.00     0.01       0.00     0.08
 32   3.8142      0.00     0.06       0.00    -0.07
 33   3.8224      0.00    -0.11       0.00    -0.04
 34   3.9728      0.00     0.02       0.00    -0.09
 35   4.0626      0.00    -0.02       0.00     0.22
 36   4.0627      0.00     0.02       0.00     0.06

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.

500877    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        47.416    47.416    47.416
ecceobj         0.280     0.280     0.280
incobj          8.338     8.338     8.338
qmin           32.978    32.978    32.977
qmax           63.414    63.401    63.425
amean          47.797    47.797    47.797
amin           47.265    47.263    47.274
amax           48.473    48.473    48.474
emean           0.291     0.291     0.291
emin            0.270     0.270     0.270
emax            0.310     0.310     0.310
imean           6.727     6.728     6.726
imin            5.689     5.689     5.688
imax            7.619     7.619     7.619
excite_mean     0.314     0.314     0.314
fracstop        1.000     1.000     1.000
cjmean          3.024     3.024     3.024

libcent 0       285.8     285.9     285.4
libamp  0        25.1      25.2      24.9
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       188.6     188.6     188.6
kozaiamp        180.0     180.0     180.0