Orbit Fit and Astrometric record for 500880

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: 500880    
# Created Mon Dec 18 02:36:53 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   39 observations of   39
# Arc:   3.82y
# First observation: 2013/04/09
#  Last observation: 2017/02/03
# Chi-squared of fit:    16.14 DOF:   72 RMS:  0.11
# Min/Max residuals:    -0.29    0.38
# Exact a, adot, b, bdot, g, gdot:
  1.405203E-05  2.039401E-02 -7.009373E-07 -9.388424E-04  2.188667E-02 -1.321893E-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
    7.340118 -121.589712    0.626389    0.100139   -0.777237  2456392.040188
# Heliocentric elements and errors
Epoch:              2456392.5000  =  2013/04/10
Mean Anomaly:          291.67564 +/-     0.000
Argument of Peri:      186.62306 +/-     0.000
Long of Asc Node:      128.04337 +/-     0.000
Inclination:             7.65459 +/-     0.000
Eccentricity:         0.08053000 +/-    0.0000
Semi-Major Axis:     47.60703084 +/-    0.0000
Time of Perihelion: 2479163.2925 +/-       0.0
Perihelion:          43.77323675 +/-    0.0000
Aphelion:            51.44082492 +/-    0.0000
Period (y)              328.4845 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -24.68060985 +/-    0.0000
Ecliptic Y          -38.93790219 +/-    0.0000
Ecliptic Z            5.83730549 +/-    0.0000
Ecliptic XDOT         0.00224486 +/-    0.0000
Ecliptic YDOT        -0.00120909 +/-    0.0000
Ecliptic ZDOT        -0.00013746 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.46903989 +/-    0.0000
Geocenter to KBO     45.68997675 +/-    0.0000
# Hcoef:  7.46

The following table shows the complete astrometric record for 500880. 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 (500880) followed by the observatory code and reference code for the source of the astrometry.

2013 04  09.53941  15 51 18.982  -12 38 27.61  23.8r 500880    568  C~1XRc      
2013 04  10.50850  15 51 15.908  -12 38 11.99  24.0r 500880    568  C~1XRc      
2013 04  10.54891  15 51 15.783  -12 38 11.41  23.9r 500880    568  C~1XRc      
2013 04  19.56175  15 50 44.846  -12 35 45.93  24.3r 500880    568  C~1XRc      
2013 05  07.43997  15 49 33.466  -12 31 00.77  24.0r 500880    568  C~1XRc      
2013 05  07.48420  15 49 33.281  -12 31 00.08  24.2r 500880    568  C~1XRc      
2013 05  07.52439  15 49 33.105  -12 30 59.48  23.8r 500880    568  C~1XRc      
2013 05  09.48456  15 49 24.727  -12 30 29.61  23.8r 500880    568  C~1XRc      
2013 05  10.49178  15 49 20.401  -12 30 14.50  24.4r 500880    568  C~1XRc      
2013 06  01.41302  15 47 45.094  -12 25 22.41  24.2r 500880    568  C~1XRc      
2013 06  02.40662  15 47 40.837  -12 25 11.48  24.6r 500880    568  C~1XRc      
2013 06  02.41172  15 47 40.834  -12 25 11.50  24.3r 500880    568  C~1XRc      
2013 06  02.41674  15 47 40.800  -12 25 11.48  24.1r 500880    568  C~1XRc      
2013 06  04.37273  15 47 32.543  -12 24 50.12  23.8r 500880    568  C~1XRc      
2013 06  06.37603  15 47 24.163  -12 24 29.27  23.8r 500880    568  C~1XRc      
2013 07  02.32839  15 45 48.916  -12 21 38.89        500880    568  C~1XRc      
2013 07  03.36611  15 45 45.789  -12 21 35.86  24.1r 500880    568  C~1XRc      
2014 02  28.63842  15 57 01.334  -13 05 04.09  23.9r 500880    568  C~2LSW      
2014 03  06.56601  15 57 00.185  -13 04 06.42  24.0r 500880    568  C~1XRc      
2014 04  05.60639  15 56 09.453  -12 57 30.84  24.1r 500880    568  C~1XRc      
2014 04  30.42091  15 54 42.755  -12 51 02.40  23.7r 500880    568  C~1XRc      
2014 04  30.47219  15 54 42.541  -12 51 01.58  23.3r 500880    568  C~1XRc      
2014 04  30.52393  15 54 42.327  -12 51 00.62  24.0r 500880    568  C~1XRc      
2014 05  05.48351  15 54 21.869  -12 49 44.48  23.9r 500880    568  C~1XRc      
2014 05  06.41552  15 54 17.964  -12 49 30.37  23.8r 500880    568  C~1XRc      
2014 05  06.48238  15 54 17.670  -12 49 29.35  23.9r 500880    568  C~1XRd      
2014 05  06.55850  15 54 17.344  -12 49 28.18  23.7r 500880    568  C~1XRd      
2014 05  22.46588  15 53 08.368  -12 45 42.64  24.0r 500880    568  C~1XRd      
2014 05  24.44313  15 52 59.660  -12 45 17.47  23.5r 500880    568  C~1XRd      
2014 07  01.37151  15 50 29.667  -12 40 01.27  24.0r 500880    568  C~1XRd      
2014 07  18.35282  15 49 44.545  -12 39 51.26  24.4r 500880    568  C~1XRd      
2015 03  22.60757  16 01 20.995  -13 18 32.75  24.0r 500880    568  C~1XRd      
2015 04  21.53176  15 59 58.704  -13 11 15.87  23.9r 500880    568  C~1XRd      
2015 04  21.58936  15 59 58.496  -13 11 14.94  23.9r 500880    568  C~1XRd      
2016 05  29.38862  16 01 59.383  -13 20 02.97  24.0w 500880    568  C~2LSW      
2016 05  30.42964  16 01 54.807  -13 19 51.37  24.1w 500880    568  C~2LSW      
2016 06  03.42874  16 01 37.357  -13 19 08.81  24.2w 500880    568  C~2LSW      
2017 01  31.65858  16 10 11.431  -13 58 39.19  23.9w 500880    568  C~2LSW      
2017 02  03.65494  16 10 19.509  -13 58 36.25        500880    568  C~2LSW      

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     0.10       0.00     0.05
  2   0.0027      0.00    -0.04       0.00     0.10
  3   0.0028      0.00     0.06       0.00     0.03
  4   0.0274      0.00     0.16       0.00    -0.14
  5   0.0764      0.00     0.01       0.00     0.01
  6   0.0765      0.00     0.11       0.00     0.02
  7   0.0766      0.00     0.08       0.00    -0.00
  8   0.0820      0.00     0.02       0.00     0.00
  9   0.0847      0.00     0.10       0.00    -0.07
 10   0.1448      0.00     0.09       0.00     0.01
 11   0.1475      0.00    -0.29       0.00    -0.12
 12   0.1475      0.00    -0.01       0.00    -0.20
 13   0.1475      0.00    -0.19       0.00    -0.23
 14   0.1529      0.00    -0.00       0.00    -0.00
 15   0.1583      0.00     0.06       0.00     0.14
 16   0.2294      0.00     0.19       0.00    -0.27
 17   0.2322      0.00     0.20       0.00     0.05
 18   0.8901      0.00     0.05       0.00     0.01
 19   0.9063      0.00     0.09       0.00     0.03
 20   0.9885      0.00     0.03       0.00    -0.02
 21   1.0565      0.00     0.08       0.00     0.01
 22   1.0566      0.00     0.04       0.00     0.03
 23   1.0568      0.00     0.03       0.00     0.19
 24   1.0703      0.00    -0.02       0.00     0.07
 25   1.0729      0.00     0.09       0.00     0.06
 26   1.0731      0.00    -0.01       0.00     0.07
 27   1.0733      0.00    -0.00       0.00     0.08
 28   1.1168      0.00     0.38       0.00     0.24
 29   1.1223      0.00     0.07       0.00    -0.03
 30   1.2261      0.00     0.12       0.00    -0.17
 31   1.2726      0.00    -0.06       0.00     0.04
 32   1.9495      0.00    -0.03       0.00    -0.12
 33   2.0315      0.00    -0.01       0.00     0.06
 34   2.0316      0.00     0.09       0.00     0.10
 35   3.1372      0.00    -0.05       0.00    -0.19
 36   3.1400      0.00    -0.00       0.00    -0.14
 37   3.1510      0.00     0.12       0.00     0.04
 38   3.8142      0.00    -0.01       0.00    -0.13
 39   3.8224      0.00    -0.04       0.00     0.14

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.

500880    quality flag:3

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

axisobj        47.475    47.475    47.476
ecceobj         0.083     0.083     0.083
incobj          7.651     7.651     7.651
qmin           41.571    40.507    41.640
qmax           54.419    55.643    54.371
amean          47.797    47.797    47.797
amin           47.319    47.316    47.332
amax           48.312    48.328    48.337
emean           0.095     0.110     0.093
emin            0.053     0.062     0.060
emax            0.127     0.152     0.128
imean           5.973     5.348     5.220
imin            5.396     4.056     4.142
imax            6.357     6.233     6.237
excite_mean     0.141     0.145     0.131
fracstop        1.000     1.000     1.000
cjmean          3.124     3.123     3.128

libcent 0       181.8     182.6     181.8
libamp  0       135.1     134.2     133.4
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       104.0     131.8     143.9
kozaiamp        180.0     180.0     179.9