Orbit Fit and Astrometric record for 500885

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: 500885    
# Created Sat Dec 16 02:36:55 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   23 observations of   23
# Arc:   3.15y
# First observation: 2013/04/10
#  Last observation: 2016/06/03
# Chi-squared of fit:    17.60 DOF:   40 RMS:  0.15
# Min/Max residuals:    -0.27    0.46
# Exact a, adot, b, bdot, g, gdot:
  1.697972E-05  3.239418E-02 -3.586508E-07 -6.233817E-04  2.944180E-02  7.300940E-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
    7.348005 -115.832641    0.688808    0.093361   -0.723856  2456393.110038
# Heliocentric elements and errors
Epoch:              2456392.5000  =  2013/04/10
Mean Anomaly:           48.73596 +/-     0.000
Argument of Peri:       24.77014 +/-     0.000
Long of Asc Node:      145.67426 +/-     0.000
Inclination:             7.25189 +/-     0.000
Eccentricity:         0.23078858 +/-    0.0000
Semi-Major Axis:     39.18604798 +/-    0.0000
Time of Perihelion: 2444263.0080 +/-       0.0
Perihelion:          30.14235550 +/-    0.0000
Aphelion:            48.22974046 +/-    0.0000
Period (y)              245.3044 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -15.61545826 +/-    0.0000
Ecliptic Y          -30.67461165 +/-    0.0000
Ecliptic Z            4.34404255 +/-    0.0000
Ecliptic XDOT         0.00240843 +/-    0.0000
Ecliptic YDOT        -0.00192503 +/-    0.0000
Ecliptic ZDOT         0.00002948 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.69346644 +/-    0.0000
Geocenter to KBO     33.96520724 +/-    0.0000
# Hcoef:  9.11

The following table shows the complete astrometric record for 500885. 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 (500885) followed by the observatory code and reference code for the source of the astrometry.

2013 04  10.60926  16 14 19.589  -13 45 12.63  24.5r 500885    568  C~1XRf      
2013 04  19.48015  16 13 43.594  -13 42 23.35        500885    568  C~1XRf      
2013 04  19.53302  16 13 43.371  -13 42 22.18  23.7r 500885    568  C~1XRf      
2013 05  08.46726  16 12 09.045  -13 36 23.69  24.2r 500885    568  C~1XRf      
2013 05  08.51126  16 12 08.809  -13 36 22.85  24.3r 500885    568  C~1XRf      
2013 05  08.55508  16 12 08.550  -13 36 22.05  24.3r 500885    568  C~1XRf      
2013 05  09.56241  16 12 03.042  -13 36 03.44  24.9r 500885    568  C~1XRf      
2013 05  10.56772  16 11 57.507  -13 35 45.60  24.3r 500885    568  C~1XRf      
2013 06  06.35136  16 09 24.998  -13 28 50.70        500885    568  C~1XRf      
2013 07  04.37987  16 07 04.424  -13 25 11.67  24.2r 500885    568  C~1XRg      
2013 08  02.32237  16 05 40.742  -13 26 29.62        500885    568  C~1XRg      
2014 02  28.57787  16 22 42.106  -14 16 45.19  24.6r 500885    568  C~2LSW      
2014 03  06.63154  16 22 46.065  -14 15 38.87  24.8r 500885    568  C~1XRg      
2014 03  07.60617  16 22 46.303  -14 15 27.08        500885    568  C~1XRg      
2014 05  01.47315  16 20 16.693  -14 00 21.49  24.5r 500885    568  C~1XRg      
2014 05  04.46995  16 20 01.387  -13 59 28.04  24.2r 500885    568  C~1XRg      
2014 05  25.46370  16 18 05.133  -13 53 43.83  24.2r 500885    568  C~1XRg      
2014 05  25.47257  16 18 05.071  -13 53 43.61        500885    568  C~1XRg      
2014 06  02.46510  16 17 19.164  -13 51 53.43  24.7r 500885    568  C~1XRg      
2014 07  18.37324  16 13 41.272  -13 47 27.79  24.9r 500885    568  C~1XRg      
2015 03  22.58284  16 29 54.606  -14 32 02.24  24.7r 500885    568  C~1XRg      
2016 05  29.37243  16 32 28.830  -14 33 33.33  24.3w 500885    568  C~2LSW      
2016 06  03.41257  16 32 00.016  -14 32 34.12  24.1w 500885    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    -0.24       0.00     0.46
  2   0.0243      0.00    -0.27       0.00    -0.14
  3   0.0244      0.00    -0.04       0.00     0.01
  4   0.0763      0.00     0.13       0.00    -0.07
  5   0.0764      0.00     0.25       0.00    -0.03
  6   0.0765      0.00     0.02       0.00    -0.04
  7   0.0793      0.00     0.09       0.00     0.27
  8   0.0820      0.00     0.11       0.00    -0.04
  9   0.1554      0.00     0.39       0.00    -0.15
 10   0.2321      0.00     0.01       0.00    -0.24
 11   0.3113      0.00    -0.15       0.00     0.23
 12   0.8870      0.00    -0.05       0.00    -0.02
 13   0.9036      0.00    -0.07       0.00    -0.10
 14   0.9062      0.00     0.06       0.00     0.06
 15   1.0564      0.00    -0.02       0.00     0.16
 16   1.0646      0.00    -0.03       0.00     0.13
 17   1.1221      0.00     0.24       0.00    -0.17
 18   1.1221      0.00     0.09       0.00    -0.08
 19   1.1440      0.00     0.04       0.00     0.01
 20   1.2697      0.00     0.06       0.00     0.11
 21   1.9465      0.00     0.18       0.00    -0.03
 22   3.1342      0.00    -0.06       0.00    -0.10
 23   3.1480      0.00     0.10       0.00     0.04

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.

500885    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.036    39.036    39.036
ecceobj         0.227     0.227     0.227
incobj          7.254     7.254     7.254
qmin           29.597    29.597    29.597
qmax           49.831    49.828    49.833
amean          39.455    39.455    39.455
amin           39.036    39.036    39.036
amax           39.933    39.931    39.935
emean           0.223     0.223     0.223
emin            0.196     0.196     0.195
emax            0.249     0.249     0.249
imean           7.275     7.278     7.276
imin            5.786     5.786     5.786
imax            8.751     8.751     8.751
excite_mean     0.257     0.257     0.257
fracstop        1.000     1.000     1.000
cjmean          2.976     2.976     2.976

libcent 0       180.6     180.2     180.2
libamp  0        65.9      65.5      65.4
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       202.8     202.8     202.8
kozaiamp        180.0     180.0     179.9