Orbit Fit and Astrometric record for 500887

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: 500887    
# Created Fri Dec 15 02:36:51 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   32 observations of   32
# Arc:   3.12y
# First observation: 2013/04/19
#  Last observation: 2016/06/03
# Chi-squared of fit:    25.31 DOF:   58 RMS:  0.16
# Min/Max residuals:    -0.23    0.63
# Exact a, adot, b, bdot, g, gdot:
  1.642891E-05  2.563687E-02  1.690152E-06  2.125468E-03  2.537902E-02 -1.323484E-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
    8.914846 -123.375099    0.457648    0.138892   -0.885386  2456402.058538
# Heliocentric elements and errors
Epoch:              2456402.5000  =  2013/04/20
Mean Anomaly:          310.84997 +/-     0.000
Argument of Peri:      117.53468 +/-     0.000
Long of Asc Node:      175.12742 +/-     0.000
Inclination:             9.95899 +/-     0.000
Eccentricity:         0.07773987 +/-    0.0000
Semi-Major Axis:     42.28048593 +/-    0.0000
Time of Perihelion: 2470112.2534 +/-       0.0
Perihelion:          38.99360636 +/-    0.0000
Aphelion:            45.56736549 +/-    0.0000
Period (y)              274.9275 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -22.28827683 +/-    0.0000
Ecliptic Y          -33.00158047 +/-    0.0000
Ecliptic Z            6.10619360 +/-    0.0000
Ecliptic XDOT         0.00240040 +/-    0.0000
Ecliptic YDOT        -0.00137373 +/-    0.0000
Ecliptic ZDOT         0.00020454 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.28846405 +/-    0.0000
Geocenter to KBO     39.40267751 +/-    0.0000
# Hcoef:  8.29

The following table shows the complete astrometric record for 500887. 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 (500887) followed by the observatory code and reference code for the source of the astrometry.

2013 04  19.55776  15 45 40.432  -10 43 07.23  24.4r 500887    568  C~1XRg      
2013 05  04.43834  15 44 33.821  -10 37 48.77  24.3r 500887    568  C~1XRg      
2013 05  04.44379  15 44 33.795  -10 37 49.02        500887    568  C~1XRg      
2013 05  07.43599  15 44 19.514  -10 36 48.03  24.5r 500887    568  C~1XRg      
2013 05  07.48020  15 44 19.306  -10 36 47.02  24.3r 500887    568  C~1XRg      
2013 05  07.52039  15 44 19.097  -10 36 46.12  24.3r 500887    568  C~1XRg      
2013 05  09.48057  15 44 09.641  -10 36 07.13  23.9r 500887    568  C~1XRg      
2013 05  10.48774  15 44 04.757  -10 35 47.29  24.7r 500887    568  C~1XRg      
2013 06  01.40276  15 42 17.775  -10 29 33.24  24.1r 500887    568  C~1XRg      
2013 06  01.40895  15 42 17.704  -10 29 33.03  24.1r 500887    568  C~1XRg      
2013 06  02.40261  15 42 12.974  -10 29 19.04  24.5r 500887    568  C~1XRg      
2014 02  24.63155  15 53 26.682  -11 12 39.41  24.1r 500887    568  C~2LSW      
2014 02  28.60816  15 53 27.877  -11 11 43.28  24.4r 500887    568  C~2LSW      
2014 03  06.53575  15 53 26.637  -11 10 11.27  24.1r 500887    568  C~1XRg      
2014 04  04.52511  15 52 32.532  -11 00 53.73  23.7r 500887    568  C~2LSW      
2014 04  30.39739  15 50 51.003  -10 51 40.54  24.1r 500887    568  C~1XRg      
2014 04  30.44891  15 50 50.769  -10 51 39.62  24.1r 500887    568  C~1XRg      
2014 04  30.50065  15 50 50.519  -10 51 38.51  24.3r 500887    568  C~1XRg      
2014 05  05.45039  15 50 27.466  -10 49 57.44  24.2r 500887    568  C~1XRg      
2014 05  06.39222  15 50 22.992  -10 49 38.72  24.1r 500887    568  C~1XRg      
2014 05  06.45909  15 50 22.668  -10 49 37.29  24.3r 500887    568  C~1XRg      
2014 05  06.51006  15 50 22.423  -10 49 36.32  23.9r 500887    568  C~1XRg      
2014 05  06.53514  15 50 22.299  -10 49 35.77  24.4r 500887    568  C~1XRg      
2014 05  22.50235  15 49 04.247  -10 44 41.14        500887    568  C~1XRg      
2014 05  24.47488  15 48 54.523  -10 44 09.12  23.9r 500887    568  C~1XRg      
2014 06  02.45717  15 48 10.695  -10 41 55.03  23.8r 500887    568  C~1XRg      
2014 07  01.36375  15 46 07.995  -10 37 43.98  23.8r 500887    568  C~1XRg      
2014 07  18.33716  15 45 19.402  -10 37 45.41  24.3r 500887    568  C~1XRg      
2015 03  22.60347  15 59 02.221  -11 17 08.03  24.1r 500887    568  C~1XRg      
2015 08  11.30815  15 50 43.753  -10 53 07.44  24.3r 500887    568  C~2LSW      
2016 05  29.38457  16 00 28.138  -11 06 43.65  24.2w 500887    568  C~2LSW      
2016 06  03.42470  16 00 03.390  -11 05 36.19  24.3w 500887    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    -0.21       0.00     0.53
  2   0.0407      0.00    -0.04       0.00     0.14
  3   0.0408      0.00    -0.04       0.00    -0.22
  4   0.0489      0.00    -0.03       0.00    -0.15
  5   0.0491      0.00     0.10       0.00    -0.03
  6   0.0492      0.00    -0.08       0.00     0.06
  7   0.0545      0.00    -0.00       0.00    -0.05
  8   0.0573      0.00     0.09       0.00    -0.03
  9   0.1173      0.00     0.63       0.00    -0.23
 10   0.1173      0.00     0.01       0.00    -0.11
 11   0.1200      0.00    -0.08       0.00     0.01
 12   0.8517      0.00    -0.05       0.00    -0.02
 13   0.8626      0.00     0.10       0.00    -0.02
 14   0.8788      0.00    -0.06       0.00    -0.10
 15   0.9582      0.00    -0.21       0.00     0.01
 16   1.0290      0.00     0.01       0.00     0.15
 17   1.0291      0.00     0.10       0.00     0.01
 18   1.0293      0.00    -0.03       0.00     0.05
 19   1.0428      0.00     0.22       0.00     0.08
 20   1.0454      0.00     0.11       0.00    -0.05
 21   1.0456      0.00     0.12       0.00     0.05
 22   1.0457      0.00     0.15       0.00     0.00
 23   1.0458      0.00     0.11       0.00     0.05
 24   1.0895      0.00     0.07       0.00     0.44
 25   1.0949      0.00     0.24       0.00     0.03
 26   1.1195      0.00     0.03       0.00    -0.08
 27   1.1986      0.00     0.15       0.00     0.15
 28   1.2451      0.00    -0.06       0.00    -0.10
 29   1.9221      0.00     0.23       0.00    -0.19
 30   2.3101      0.00    -0.12       0.00     0.00
 31   3.1097      0.00     0.07       0.00    -0.06
 32   3.1235      0.00    -0.09       0.00    -0.13

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.

500887    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        42.160    42.160    42.160
ecceobj         0.079     0.079     0.079
incobj          9.978     9.978     9.978
qmin           35.730    35.769    35.644
qmax           49.566    49.661    49.640
amean          42.477    42.432    42.431
amin           41.883    41.831    41.824
amax           42.898    42.893    42.905
emean           0.110     0.113     0.114
emin            0.070     0.070     0.070
emax            0.156     0.159     0.158
imean          10.071     9.983     9.959
imin            8.564     8.457     8.450
imax           11.588    11.584    11.589
excite_mean     0.208     0.208     0.208
fracstop        1.000     1.000     1.000
cjmean          3.033     3.033     3.033

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     181.5     180.7
kozaiamp        180.0     179.9     180.0