Orbit Fit and Astrometric record for 500884

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: 500884    
# Created Fri Dec 15 02:36:51 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   31 observations of   31
# Arc:   3.12y
# First observation: 2013/04/19
#  Last observation: 2016/06/03
# Chi-squared of fit:    33.76 DOF:   56 RMS:  0.18
# Min/Max residuals:    -0.38    0.65
# Exact a, adot, b, bdot, g, gdot:
  1.968202E-05  4.111809E-02 -6.555755E-06 -1.388069E-02  3.418306E-02 -3.778689E-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
    7.928001 -117.611575    0.546574    0.116551   -0.836830  2456401.972928
# Heliocentric elements and errors
Epoch:              2456402.5000  =  2013/04/20
Mean Anomaly:          342.72474 +/-     0.000
Argument of Peri:      186.51887 +/-     0.000
Long of Asc Node:       83.06494 +/-     0.000
Inclination:            20.07685 +/-     0.000
Eccentricity:         0.25422381 +/-    0.0000
Semi-Major Axis:     39.29126765 +/-    0.0000
Time of Perihelion: 2460719.3263 +/-       0.0
Perihelion:          29.30249201 +/-    0.0000
Aphelion:            49.28004329 +/-    0.0000
Period (y)              246.2931 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -14.30383877 +/-    0.0000
Ecliptic Y          -26.16783080 +/-    0.0000
Ecliptic Z            4.03485138 +/-    0.0000
Ecliptic XDOT         0.00297978 +/-    0.0000
Ecliptic YDOT        -0.00139638 +/-    0.0000
Ecliptic ZDOT        -0.00114273 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   30.09383317 +/-    0.0000
Geocenter to KBO     29.25433142 +/-    0.0000
# Hcoef:  9.68

The following table shows the complete astrometric record for 500884. 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 (500884) followed by the observatory code and reference code for the source of the astrometry.

2013 04  19.47215  16 07 38.452  -12 51 33.64  24.6r 500884    568  C~1XRf      
2013 04  19.52501  16 07 38.184  -12 51 32.99  24.4r 500884    568  C~1XRf      
2013 05  08.45928  16 05 48.353  -12 46 40.42  24.1r 500884    568  C~1XRf      
2013 05  08.50332  16 05 48.069  -12 46 39.84  24.5r 500884    568  C~1XRf      
2013 05  08.54713  16 05 47.787  -12 46 39.26  24.3r 500884    568  C~1XRf      
2013 05  09.55421  16 05 41.396  -12 46 24.86  24.1r 500884    568  C~1XRf      
2013 05  10.55976  16 05 34.988  -12 46 10.60  24.2r 500884    568  C~1XRf      
2013 06  06.34333  16 02 39.652  -12 41 20.24  24.4r 500884    568  C~1XRf      
2013 06  12.46117  16 02 01.096  -12 40 46.19  24.3r 500884    568  C~1XRf      
2013 06  13.45477  16 01 55.010  -12 40 41.13  24.4r 500884    568  C~1XRf      
2013 07  02.36871  16 00 10.374  -12 40 38.35  24.3r 500884    568  C~1XRf      
2013 07  04.35949  16 00 00.935  -12 40 47.18  24.5r 500884    568  C~1XRf      
2013 08  01.25494  15 58 31.924  -12 46 04.31        500884    568  C~1XRf      
2013 08  02.30273  15 58 30.327  -12 46 23.79  24.1r 500884    568  C~1XRf      
2014 03  06.62650  16 18 28.320  -14 12 57.04        500884    568  C~1XRf      
2014 03  07.60113  16 18 28.522  -14 12 51.22  24.4r 500884    568  C~1XRf      
2014 05  01.41785  16 15 30.874  -14 02 07.47  24.3r 500884    568  C~1XRf      
2014 05  01.46926  16 15 30.562  -14 02 06.80  24.5r 500884    568  C~1XRf      
2014 05  01.52791  16 15 30.196  -14 02 05.86  24.0r 500884    568  C~1XRf      
2014 05  04.41561  16 15 12.887  -14 01 27.25  24.0r 500884    568  C~1XRf      
2014 05  04.46606  16 15 12.587  -14 01 26.61  24.1r 500884    568  C~1XRf      
2014 05  04.51675  16 15 12.285  -14 01 25.81  23.9r 500884    568  C~1XRf      
2014 05  22.51414  16 13 16.465  -13 57 47.83  23.5r 500884    568  C~1XRf      
2014 05  25.46782  16 12 56.767  -13 57 18.06  24.6r 500884    568  C~1XRf      
2014 06  02.46901  16 12 03.327  -13 56 07.47  24.4r 500884    568  C~1XRf      
2014 07  18.37716  16 07 54.054  -13 56 29.63  24.5r 500884    568  C~1XRf      
2014 07  18.38112  16 07 54.040  -13 56 29.76  24.7r 500884    568  C~1XRf      
2014 07  26.29286  16 07 29.727  -13 58 00.76  24.3r 500884    568  C~1XRf      
2015 03  22.58284  16 27 16.135  -15 22 06.79  24.6r 500884    568  C~1XRf      
2016 05  29.36839  16 30 55.148  -16 23 01.61  24.6w 500884    568  C~2LSW      
2016 06  03.40852  16 30 20.773  -16 22 29.61  24.4w 500884    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    -0.29       0.00     0.24
  2   0.0001      0.00     0.09       0.00    -0.15
  3   0.0520      0.00     0.13       0.00     0.02
  4   0.0521      0.00     0.13       0.00    -0.03
  5   0.0522      0.00     0.13       0.00    -0.09
  6   0.0550      0.00     0.02       0.00    -0.12
  7   0.0577      0.00     0.07       0.00    -0.09
  8   0.1311      0.00     0.10       0.00     0.26
  9   0.1478      0.00    -0.00       0.00    -0.37
 10   0.1505      0.00     0.30       0.00     0.41
 11   0.2023      0.00    -0.03       0.00    -0.10
 12   0.2078      0.00    -0.14       0.00    -0.14
 13   0.2841      0.00     0.04       0.00     0.18
 14   0.2870      0.00    -0.02       0.00    -0.37
 15   0.8793      0.00    -0.03       0.00     0.10
 16   0.8819      0.00     0.20       0.00    -0.20
 17   1.0320      0.00     0.22       0.00     0.10
 18   1.0322      0.00     0.17       0.00     0.08
 19   1.0323      0.00    -0.01       0.00     0.22
 20   1.0402      0.00    -0.38       0.00    -0.02
 21   1.0404      0.00    -0.19       0.00    -0.04
 22   1.0405      0.00    -0.01       0.00     0.08
 23   1.0898      0.00     0.25       0.00     0.32
 24   1.0979      0.00     0.65       0.00     0.04
 25   1.1198      0.00     0.07       0.00     0.15
 26   1.2455      0.00     0.08       0.00    -0.07
 27   1.2455      0.00     0.08       0.00    -0.16
 28   1.2671      0.00     0.04       0.00    -0.02
 29   1.9223      0.00     0.07       0.00     0.03
 30   3.1099      0.00     0.14       0.00    -0.25
 31   3.1237      0.00    -0.11       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.

500884    quality flag:3

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

axisobj        39.171    39.171    39.171
ecceobj         0.254     0.254     0.254
incobj         20.070    20.070    20.070
qmin           26.082    26.082    26.081
qmax           53.348    53.346    53.349
amean          39.454    39.454    39.454
amin           39.101    39.101    39.102
amax           39.899    39.897    39.902
emean           0.292     0.292     0.292
emin            0.251     0.251     0.251
emax            0.339     0.339     0.339
imean          16.795    16.794    16.796
imin           14.341    14.338    14.344
imax           18.676    18.676    18.676
excite_mean     0.412     0.412     0.412
fracstop        1.000     1.000     1.000
cjmean          2.858     2.858     2.858

libcent 0       179.9     179.9     179.8
libamp  0        16.8      16.8      16.8
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       203.5     203.6     203.5
kozaiamp        180.0     180.0     180.0