Orbit Fit and Astrometric record for 500881

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: 500881    
# Created Fri Dec 15 02:36:51 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   45 observations of   45
# Arc:   3.97y
# First observation: 2013/04/10
#  Last observation: 2017/03/30
# Chi-squared of fit:    31.03 DOF:   84 RMS:  0.15
# Min/Max residuals:    -0.36    0.59
# Exact a, adot, b, bdot, g, gdot:
  1.651015E-05  2.527032E-02 -1.339603E-06  6.783039E-04  2.510699E-02  1.003655E-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
    7.229201 -116.880785    0.675495    0.093412   -0.736287  2456393.098038
# Heliocentric elements and errors
Epoch:              2456392.5000  =  2013/04/10
Mean Anomaly:           30.07177 +/-     0.000
Argument of Peri:       44.05103 +/-     0.000
Long of Asc Node:      165.36199 +/-     0.000
Inclination:             7.28739 +/-     0.000
Eccentricity:         0.04593013 +/-    0.0000
Semi-Major Axis:     42.22352172 +/-    0.0000
Time of Perihelion: 2448021.3220 +/-       0.0
Perihelion:          40.28418975 +/-    0.0000
Aphelion:            44.16285368 +/-    0.0000
Period (y)              274.3721 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -18.80203370 +/-    0.0000
Ecliptic Y          -35.59787446 +/-    0.0000
Ecliptic Z            5.01209119 +/-    0.0000
Ecliptic XDOT         0.00240673 +/-    0.0000
Ecliptic YDOT        -0.00133413 +/-    0.0000
Ecliptic ZDOT         0.00008729 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.56901487 +/-    0.0000
Geocenter to KBO     39.82955014 +/-    0.0000
# Hcoef:  8.22

The following table shows the complete astrometric record for 500881. 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 (500881) followed by the observatory code and reference code for the source of the astrometry.

2013 04  10.59726  16 10 01.685  -13 40 52.83        500881    568  C~1XRd      
2013 04  19.46815  16 09 29.738  -13 38 18.35  24.5r 500881    568  C~1XRd      
2013 04  19.52102  16 09 29.536  -13 38 17.54  24.1r 500881    568  C~1XRd      
2013 05  08.45533  16 08 06.808  -13 32 49.12  24.1r 500881    568  C~1XRd      
2013 05  08.49936  16 08 06.590  -13 32 48.41  24.1r 500881    568  C~1XRd      
2013 05  08.54316  16 08 06.389  -13 32 47.64  24.2r 500881    568  C~1XRd      
2013 05  09.55025  16 08 01.586  -13 32 30.91  24.5r 500881    568  C~1XRd      
2013 06  06.33922  16 05 44.609  -13 25 48.84  23.9r 500881    568  C~1XRd      
2013 06  06.42482  16 05 44.191  -13 25 48.13  24.4r 500881    568  C~1XRd      
2013 06  07.39360  16 05 39.506  -13 25 36.81  23.9r 500881    568  C~1XRd      
2013 06  08.30862  16 05 35.087  -13 25 26.26  23.8r 500881    568  C~1XRd      
2013 06  12.44212  16 05 15.465  -13 24 42.32        500881    568  C~1XRd      
2013 06  12.45678  16 05 15.399  -13 24 42.00        500881    568  C~1XRd      
2013 06  13.45080  16 05 10.768  -13 24 32.36  24.0r 500881    568  C~1XRd      
2013 07  02.37684  16 03 50.762  -13 22 18.96  24.4r 500881    568  C~1XRd      
2013 07  04.36816  16 03 43.479  -13 22 11.16  24.4r 500881    568  C~1XRd      
2013 08  01.26276  16 02 32.749  -13 22 44.12        500881    568  C~1XRd      
2013 08  02.31057  16 02 31.355  -13 22 50.30        500881    568  C~1XRd      
2013 08  05.30049  16 02 28.006  -13 23 10.69  24.6r 500881    568  C~1XRd      
2014 02  28.57283  16 16 50.799  -14 03 57.86  24.3r 500881    568  C~2LSW      
2014 04  04.51497  16 16 13.049  -13 56 07.37  24.5r 500881    568  C~1XRd      
2014 04  04.58425  16 16 12.856  -13 56 06.29  24.4r 500881    568  C~2LSW      
2014 04  04.59120  16 16 12.844  -13 56 06.05  23.8r 500881    568  C~1XRd      
2014 05  01.41785  16 14 34.780  -13 48 34.73  24.1r 500881    568  C~1XRd      
2014 05  01.44535  16 14 34.653  -13 48 34.49  24.2r 500881    568  C~1XRd      
2014 05  01.46926  16 14 34.554  -13 48 34.00  24.3r 500881    568  C~1XRd      
2014 05  01.50260  16 14 34.409  -13 48 33.77  23.7r 500881    568  C~1XRd      
2014 05  01.52791  16 14 34.293  -13 48 32.99  24.0r 500881    568  C~1XRd      
2014 05  01.55699  16 14 34.159  -13 48 32.21  24.2r 500881    568  C~1XRd      
2014 05  04.41561  16 14 21.288  -13 47 45.00  24.0r 500881    568  C~1XRd      
2014 05  04.44278  16 14 21.142  -13 47 44.07  23.8r 500881    568  C~1XRd      
2014 05  04.46606  16 14 21.059  -13 47 44.06  24.0r 500881    568  C~1XRd      
2014 05  04.49329  16 14 20.927  -13 47 43.48  23.7r 500881    568  C~1XRd      
2014 05  04.51675  16 14 20.825  -13 47 42.89  24.3r 500881    568  C~1XRd      
2014 05  04.54574  16 14 20.681  -13 47 42.62  24.4r 500881    568  C~1XRd      
2014 05  22.51414  16 12 54.062  -13 43 02.16  23.6r 500881    568  C~1XRd      
2014 05  25.46782  16 12 39.284  -13 42 20.57  24.1r 500881    568  C~1XRd      
2014 06  02.46901  16 11 59.379  -13 40 35.93  23.8r 500881    568  C~1XRd      
2014 07  18.37716  16 08 51.748  -13 36 00.15  24.7r 500881    568  C~1XRd      
2015 03  22.57019  16 22 31.848  -14 12 19.15  24.2r 500881    568  C~1XRd      
2015 08  11.31349  16 14 00.651  -13 51 27.92  24.1r 500881    568  C~2LSW      
2016 05  29.37647  16 24 08.672  -14 07 37.41        500881    568  C~2LSW      
2016 06  03.41661  16 23 43.441  -14 06 38.75  24.3w 500881    568  C~2LSW      
2017 03  28.62163  16 34 05.163  -14 34 49.21  24.6w 500881    568  C~2LSW      
2017 03  30.60577  16 34 01.495  -14 34 21.12  24.4w 500881    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    -0.08       0.00     0.59
  2   0.0243      0.00     0.01       0.00    -0.03
  3   0.0244      0.00     0.14       0.00    -0.15
  4   0.0763      0.00    -0.07       0.00    -0.05
  5   0.0764      0.00    -0.14       0.00    -0.07
  6   0.0765      0.00     0.02       0.00    -0.04
  7   0.0793      0.00     0.02       0.00    -0.12
  8   0.1554      0.00     0.13       0.00    -0.07
  9   0.1556      0.00     0.20       0.00    -0.35
 10   0.1582      0.00     0.19       0.00    -0.19
 11   0.1607      0.00    -0.11       0.00     0.02
 12   0.1721      0.00    -0.02       0.00     0.00
 13   0.1721      0.00     0.04       0.00     0.17
 14   0.1748      0.00     0.13       0.00    -0.08
 15   0.2266      0.00     0.08       0.00    -0.21
 16   0.2321      0.00     0.10       0.00    -0.00
 17   0.3085      0.00     0.15       0.00     0.03
 18   0.3113      0.00    -0.10       0.00     0.18
 19   0.3195      0.00     0.02       0.00    -0.13
 20   0.8870      0.00     0.02       0.00     0.01
 21   0.9827      0.00     0.08       0.00     0.06
 22   0.9829      0.00     0.09       0.00     0.02
 23   0.9829      0.00     0.20       0.00     0.15
 24   1.0563      0.00    -0.02       0.00     0.10
 25   1.0564      0.00    -0.06       0.00    -0.12
 26   1.0565      0.00     0.08       0.00    -0.03
 27   1.0566      0.00     0.17       0.00    -0.36
 28   1.0566      0.00     0.15       0.00    -0.00
 29   1.0567      0.00     0.11       0.00     0.29
 30   1.0645      0.00     0.05       0.00    -0.16
 31   1.0646      0.00    -0.24       0.00     0.33
 32   1.0647      0.00     0.14       0.00    -0.05
 33   1.0647      0.00     0.06       0.00     0.08
 34   1.0648      0.00     0.17       0.00     0.28
 35   1.0649      0.00     0.03       0.00     0.07
 36   1.1141      0.00     0.46       0.00     0.07
 37   1.1222      0.00    -0.02       0.00    -0.04
 38   1.1441      0.00     0.06       0.00     0.00
 39   1.2698      0.00    -0.08       0.00    -0.18
 40   1.9465      0.00    -0.04       0.00    -0.10
 41   2.3346      0.00    -0.09       0.00    -0.07
 42   3.1342      0.00     0.05       0.00    -0.07
 43   3.1480      0.00     0.05       0.00     0.06
 44   3.9645      0.00     0.08       0.00    -0.07
 45   3.9699      0.00    -0.05       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.

500881    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        42.101    42.101    42.101
ecceobj         0.042     0.042     0.042
incobj          7.297     7.297     7.297
qmin           37.609    38.558    38.607
qmax           47.545    46.623    46.627
amean          42.330    42.331    42.327
amin           41.891    41.917    41.905
amax           42.804    42.781    42.780
emean           0.074     0.063     0.062
emin            0.033     0.032     0.028
emax            0.111     0.090     0.090
imean           7.804     7.659     7.476
imin            6.312     6.312     6.258
imax            9.261     9.144     9.114
excite_mean     0.155     0.148     0.144
fracstop        1.000     1.000     1.000
cjmean          3.054     3.056     3.057

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       180.2     179.3     179.1
kozaiamp        180.0     180.0     180.0