Orbit Fit and Astrometric record for 500878

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: 500878    
# Created Mon Dec 18 02:36:53 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   32 observations of   32
# Arc:   4.12y
# First observation: 2013/04/09
#  Last observation: 2017/05/21
# Chi-squared of fit:    21.12 DOF:   58 RMS:  0.14
# Min/Max residuals:    -0.30    0.69
# Exact a, adot, b, bdot, g, gdot:
  1.402150E-05  1.892320E-02  3.087170E-06  5.355719E-03  2.225736E-02 -7.479477E-04
# 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
    9.100542 -122.698115    0.611166    0.125856   -0.785572  2456392.036308
# Heliocentric elements and errors
Epoch:              2456392.5000  =  2013/04/10
Mean Anomaly:          209.82844 +/-     0.000
Argument of Peri:      185.58464 +/-     0.000
Long of Asc Node:      207.99153 +/-     0.000
Inclination:            18.23279 +/-     0.000
Eccentricity:         0.11067990 +/-    0.0000
Semi-Major Axis:     41.61106009 +/-    0.0000
Time of Perihelion: 2497290.0038 +/-       0.0
Perihelion:          37.00555210 +/-    0.0000
Aphelion:            46.21656807 +/-    0.0000
Period (y)              268.4240 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -24.90856135 +/-    0.0000
Ecliptic Y          -37.67020891 +/-    0.0000
Ecliptic Z            7.10646982 +/-    0.0000
Ecliptic XDOT         0.00205791 +/-    0.0000
Ecliptic YDOT        -0.00109297 +/-    0.0000
Ecliptic ZDOT         0.00063610 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.71636317 +/-    0.0000
Geocenter to KBO     44.92900972 +/-    0.0000
# Hcoef:  7.73

The following table shows the complete astrometric record for 500878. 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 (500878) followed by the observatory code and reference code for the source of the astrometry.

2013 04  09.53553  15 48 29.728  -10 41 06.44        500878    568  C~1XRc      
2013 04  10.50462  15 48 26.604  -10 40 45.46        500878    568  C~1XRc      
2013 04  10.54490  15 48 26.458  -10 40 44.69  24.3r 500878    568  C~1XRc      
2013 04  19.55776  15 47 54.772  -10 37 28.99  24.3r 500878    568  C~1XRc      
2013 05  04.44379  15 46 54.931  -10 32 14.43  23.7r 500878    568  C~1XRc      
2013 05  07.43599  15 46 42.120  -10 31 13.97  24.1r 500878    568  C~1XRc      
2013 05  07.48020  15 46 41.911  -10 31 13.11  24.2r 500878    568  C~1XRc      
2013 05  07.52039  15 46 41.734  -10 31 12.39  24.1r 500878    568  C~1XRc      
2013 05  09.48057  15 46 33.242  -10 30 33.47  24.3r 500878    568  C~1XRc      
2013 05  10.48774  15 46 28.849  -10 30 13.71  24.2r 500878    568  C~1XRc      
2013 06  01.40276  15 44 52.458  -10 23 55.47  24.4r 500878    568  C~1XRc      
2013 06  01.40895  15 44 52.457  -10 23 55.18  24.1r 500878    568  C~1XRc      
2013 06  02.40261  15 44 48.159  -10 23 40.75  24.2r 500878    568  C~1XRc      
2013 06  06.37184  15 44 31.309  -10 22 45.83        500878    568  C~1XRc      
2013 07  02.32424  15 42 55.717  -10 18 49.52  24.2r 500878    568  C~1XRc      
2013 07  03.36215  15 42 52.588  -10 18 44.97  24.4r 500878    568  C~1XRc      
2014 04  04.52511  15 53 19.929  -10 39 06.99  23.9r 500878    568  C~1XRc      
2014 04  30.40515  15 51 48.315  -10 29 53.37  24.5r 500878    568  C~1XRc      
2014 04  30.45667  15 51 48.116  -10 29 52.36  23.4r 500878    568  C~1XRc      
2014 05  05.45039  15 51 27.204  -10 28 10.40  24.6r 500878    568  C~1XRc      
2014 05  06.39222  15 51 23.181  -10 27 51.47  23.9r 500878    568  C~1XRc      
2014 05  06.51006  15 51 22.676  -10 27 48.98  23.6r 500878    568  C~1XRc      
2014 05  06.53514  15 51 22.557  -10 27 48.61  24.1r 500878    568  C~1XRc      
2014 06  02.45717  15 49 24.279  -10 20 01.00  24.0r 500878    568  C~1XRc      
2014 07  01.36375  15 47 33.184  -10 15 19.77  24.3r 500878    568  C~1XRc      
2015 03  22.60347  15 58 24.762  -10 39 34.03  24.2r 500878    568  C~1XRc      
2015 08  11.30815  15 50 52.681  -10 13 08.49  24.3r 500878    568  C~2LSW      
2016 05  29.38457  15 58 53.196  -10 12 44.71  24.5w 500878    568  C~2LSW      
2016 06  03.42470  15 58 31.048  -10 11 34.15  24.4w 500878    568  C~2LSW      
2017 01  31.65575  16 07 06.633  -10 42 55.86  24.2w 500878    568  C~2LSW      
2017 03  30.59137  16 07 18.149  -10 27 43.31  24.7w 500878    568  C~2LSW      
2017 05  21.55690  16 04 07.160  -10 10 23.40  24.7w 500878    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    -0.19       0.00     0.69
  2   0.0027      0.00     0.19       0.00     0.10
  3   0.0028      0.00     0.03       0.00     0.00
  4   0.0274      0.00    -0.12       0.00    -0.03
  5   0.0682      0.00    -0.05       0.00     0.02
  6   0.0764      0.00     0.22       0.00     0.04
  7   0.0765      0.00    -0.00       0.00     0.02
  8   0.0766      0.00    -0.00       0.00    -0.07
  9   0.0820      0.00     0.13       0.00    -0.01
 10   0.0847      0.00     0.15       0.00     0.02
 11   0.1447      0.00     0.10       0.00    -0.30
 12   0.1448      0.00     0.49       0.00    -0.10
 13   0.1475      0.00     0.05       0.00    -0.09
 14   0.1583      0.00    -0.25       0.00    -0.01
 15   0.2294      0.00     0.01       0.00     0.09
 16   0.2322      0.00    -0.07       0.00    -0.05
 17   0.9856      0.00     0.01       0.00     0.01
 18   1.0565      0.00    -0.09       0.00     0.02
 19   1.0566      0.00     0.17       0.00    -0.03
 20   1.0703      0.00     0.19       0.00    -0.04
 21   1.0728      0.00     0.04       0.00     0.02
 22   1.0732      0.00     0.16       0.00     0.16
 23   1.0732      0.00     0.01       0.00     0.02
 24   1.1469      0.00     0.01       0.00    -0.06
 25   1.2261      0.00    -0.07       0.00    -0.09
 26   1.9495      0.00     0.02       0.00    -0.16
 27   2.3375      0.00     0.07       0.00    -0.04
 28   3.1372      0.00     0.08       0.00    -0.03
 29   3.1510      0.00    -0.03       0.00    -0.11
 30   3.8142      0.00     0.03       0.00     0.07
 31   3.9728      0.00     0.02       0.00     0.11
 32   4.1150      0.00    -0.01       0.00    -0.03

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.

500878    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.518    41.518    41.518
ecceobj         0.114     0.114     0.114
incobj         18.276    18.276    18.276
qmin           36.234    36.232    36.234
qmax           47.666    47.673    47.621
amean          41.811    41.811    41.811
amin           41.473    41.475    41.476
amax           42.196    42.177    42.182
emean           0.116     0.116     0.116
emin            0.102     0.102     0.102
emax            0.130     0.131     0.130
imean          18.961    18.959    18.964
imin           18.411    18.404    18.421
imax           19.618    19.618    19.624
excite_mean     0.345     0.345     0.345
fracstop        1.000     1.000     1.000
cjmean          2.934     2.934     2.934

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       181.9     181.6     181.7
kozaiamp        180.0     180.0     180.0