Orbit Fit and Astrometric record for 500830

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: 500830    
# Created Fri Dec 15 02:36:51 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   37 observations of   37
# Arc:   4.29y
# First observation: 2013/02/08
#  Last observation: 2017/05/24
# Chi-squared of fit:    24.54 DOF:   68 RMS:  0.14
# Min/Max residuals:    -0.25    0.79
# Exact a, adot, b, bdot, g, gdot:
  1.733211E-05  2.857232E-02 -1.583251E-06 -4.048416E-03  2.660588E-02  3.333351E-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
    2.363268 -145.664627    0.949520    0.010980   -0.264764  2456332.068818
# Heliocentric elements and errors
Epoch:              2456332.5000  =  2013/02/09
Mean Anomaly:           27.68156 +/-     0.000
Argument of Peri:      125.06722 +/-     0.000
Long of Asc Node:       49.14400 +/-     0.000
Inclination:             8.33020 +/-     0.000
Eccentricity:         0.16730168 +/-    0.0000
Semi-Major Axis:     44.04869320 +/-    0.0000
Time of Perihelion: 2448121.6898 +/-       0.0
Perihelion:          36.67927304 +/-    0.0000
Aphelion:            51.41811337 +/-    0.0000
Period (y)              292.3531 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.76295804 +/-    0.0000
Ecliptic Y          -20.54508512 +/-    0.0000
Ecliptic Z            1.54978468 +/-    0.0000
Ecliptic XDOT         0.00135498 +/-    0.0000
Ecliptic YDOT        -0.00262992 +/-    0.0000
Ecliptic ZDOT        -0.00040196 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.86004982 +/-    0.0000
Geocenter to KBO     37.58562795 +/-    0.0000
# Hcoef:  8.03

The following table shows the complete astrometric record for 500830. 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 (500830) followed by the observatory code and reference code for the source of the astrometry.

2013 02  08.56804  14 11 32.565  -10 44 20.80  23.7r 500830    568  C~1XRV      
2013 02  08.62754  14 11 32.553  -10 44 20.66  23.4r 500830    568  C~1XRV      
2013 04  04.42583  14 08 51.735  -10 29 46.22  23.8r 500830    568  C~1XRV      
2013 04  04.46629  14 08 51.532  -10 29 45.30  23.7r 500830    568  C~1XRW      
2013 04  04.50656  14 08 51.343  -10 29 44.46  23.6r 500830    568  C~1XRW      
2013 04  05.56132  14 08 46.324  -10 29 19.01  23.9r 500830    568  C~2KOF      
2013 04  05.56537  14 08 46.291  -10 29 18.86  23.0r 500830    568  C~1XRW      
2013 04  06.59893  14 08 41.338  -10 28 53.98  23.0r 500830    568  C~1XRW      
2013 04  08.39969  14 08 32.635  -10 28 10.07  23.7r 500830    568  C~1XRW      
2013 05  11.43388  14 05 46.846  -10 14 53.26  23.6r 500830    568  C~1XRW      
2013 05  12.43165  14 05 42.037  -10 14 31.33  23.9r 500830    568  C~1XRW      
2013 06  13.26956  14 03 34.981  -10 05 40.89  23.8r 500830    568  C~1XRW      
2013 06  13.30999  14 03 34.870  -10 05 40.31  23.6r 500830    568  C~1XRW      
2013 07  04.29102  14 02 51.759  -10 03 51.24  24.0r 500830    568  C~1XRW      
2013 07  06.29852  14 02 49.727  -10 03 52.59  23.7r 500830    568  C~1XRW      
2014 02  24.57010  14 17 11.873  -11 28 05.15  23.6r 500830    568  C~1XRW      
2014 02  27.65059  14 17 05.471  -11 27 29.89  23.9r 500830    568  C~1XRW      
2014 03  28.42582  14 15 28.312  -11 19 07.35  23.7r 500830    568  C~1XRW      
2014 03  28.46513  14 15 28.139  -11 19 06.44  23.8r 500830    568  C~1XRW      
2014 04  05.39234  14 14 52.116  -11 16 07.60  23.7r 500830    568  C~1XRW      
2014 04  23.21750  14 13 23.75   -11 09 00.2         500830    W84  C~1j9S      
2014 04  24.23938  14 13 18.52   -11 08 35.5   24.8V 500830    W84  C~1j9S      
2014 04  26.17361  14 13 08.62   -11 07 48.7         500830    W84  C~1j9S      
2014 05  22.40950  14 11 00.216  -10 58 05.94  23.8r 500830    568  C~1XRW      
2014 05  28.38167  14 10 34.401  -10 56 16.08  23.6r 500830    568  C~1XRW      
2014 06  26.30928  14 09 02.801  -10 50 39.98  23.8r 500830    568  C~1XRW      
2014 07  18.27586  14 08 41.073  -10 50 50.30  23.9r 500830    568  C~1XRW      
2016 05  05.39771  14 24 28.305  -12 35 45.57  23.4r 500830    568  C~2KOF      
2016 05  05.40175  14 24 28.290  -12 35 45.43  23.4r 500830    568  C~2KOF      
2016 05  29.34785  14 22 34.294  -12 27 36.87  24.0w 500830    568  C~2KOF      
2017 02  23.64413  14 35 13.043  -13 41 26.21        500830    568  C~2KOF      
2017 02  24.65456  14 35 11.561  -13 41 19.30        500830    568  C~2KOF      
2017 03  30.53104  14 33 29.715  -13 33 33.56        500830    568  C~2KOF      
2017 03  31.47468  14 33 25.685  -13 33 15.22  23.8w 500830    568  C~2KOF      
2017 05  21.34842  14 29 15.492  -13 15 00.43  23.6r 500830    568  C~2KOF      
2017 05  24.27564  14 29 01.807  -13 14 03.56  23.5r 500830    568  C~2KOF      
2017 05  24.35116  14 29 01.445  -13 14 02.20  23.7r 500830    568  C~2KOF      

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    -0.20       0.00     0.79
  2   0.0002      0.00     0.23       0.00    -0.25
  3   0.1502      0.00     0.05       0.00     0.08
  4   0.1503      0.00    -0.06       0.00     0.04
  5   0.1504      0.00     0.02       0.00    -0.09
  6   0.1533      0.00     0.11       0.00    -0.01
  7   0.1533      0.00    -0.08       0.00     0.04
  8   0.1561      0.00     0.03       0.00    -0.08
  9   0.1611      0.00     0.06       0.00     0.02
 10   0.2515      0.00     0.08       0.00    -0.11
 11   0.2542      0.00    -0.06       0.00    -0.06
 12   0.3414      0.00    -0.05       0.00    -0.10
 13   0.3415      0.00     0.13       0.00     0.06
 14   0.3990      0.00    -0.02       0.00    -0.00
 15   0.4045      0.00     0.05       0.00    -0.01
 16   1.0431      0.00     0.08       0.00    -0.10
 17   1.0516      0.00    -0.07       0.00    -0.02
 18   1.1303      0.00     0.16       0.00    -0.01
 19   1.1305      0.00     0.19       0.00     0.05
 20   1.1522      0.00     0.01       0.00     0.12
 21   1.2010      0.00     0.28       0.00     0.02
 22   1.2038      0.00     0.16       0.00    -0.02
 23   1.2091      0.00    -0.06       0.00     0.08
 24   1.2809      0.00    -0.05       0.00     0.05
 25   1.2972      0.00     0.01       0.00     0.02
 26   1.3764      0.00     0.00       0.00    -0.05
 27   1.4366      0.00     0.40       0.00     0.34
 28   3.2357      0.00    -0.11       0.00    -0.07
 29   3.2357      0.00    -0.02       0.00    -0.02
 30   3.3012      0.00    -0.12       0.00    -0.18
 31   4.0413      0.00    -0.11       0.00     0.08
 32   4.0440      0.00     0.06       0.00     0.05
 33   4.1368      0.00     0.11       0.00    -0.06
 34   4.1394      0.00     0.12       0.00     0.06
 35   4.2787      0.00     0.08       0.00     0.02
 36   4.2867      0.00     0.12       0.00    -0.07
 37   4.2869      0.00     0.02       0.00    -0.15

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.

500830    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        43.861    43.861    43.861
ecceobj         0.163     0.163     0.163
incobj          8.336     8.336     8.336
qmin           34.938    35.144    35.077
qmax           53.939    53.700    53.795
amean          44.237    44.191    44.188
amin           43.773    43.752    43.752
amax           44.788    44.701    44.673
emean           0.179     0.173     0.172
emin            0.148     0.147     0.152
emax            0.207     0.203     0.205
imean           7.375     7.157     6.420
imin            5.631     5.578     4.605
imax            9.313     9.005     7.895
excite_mean     0.220     0.214     0.206
fracstop        1.000     1.000     1.000
cjmean          3.045     3.048     3.053

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       184.0     184.6     178.4
kozaiamp        180.0     180.0     180.0