Orbit Fit and Astrometric record for 13FJ28

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: 13FJ28    
# Created Mon Dec 18 02:37:53 2017
# Orbit generated from Bernstein formalism
# Fitting   13 observations of   13
# Arc:   2.00y
# First observation: 2013/03/16
#  Last observation: 2015/03/16
Preliminary a, adot, b, bdot, g, gdot:
   0.000115   0.039034  -0.000087   0.015026   0.036176   0.000000
# Chi-squared of fit:    13.88 DOF:   20 RMS:  0.18
# Min/Max residuals:    -0.33    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.723502E-05  3.775911E-02  7.792124E-06  1.449864E-02  3.545101E-02 -1.873545E-02
# Covariance matrix:
  2.4394E-13  9.1408E-15 -8.8504E-15  4.8040E-14  3.2797E-13  1.6610E-12
  9.1408E-15  2.1917E-12 -8.2803E-14  8.1804E-13  1.3546E-12  2.8565E-11
 -8.8504E-15 -8.2803E-14  1.7193E-13 -1.3890E-13 -7.1105E-14 -1.1864E-12
  4.8040E-14  8.1804E-13 -1.3890E-13  5.3029E-13  5.5976E-13  1.1704E-11
  3.2797E-13  1.3546E-12 -7.1105E-14  5.5976E-13  1.8268E-12  1.9487E-11
  1.6610E-12  2.8565E-11 -1.1864E-12  1.1704E-11  1.9487E-11  4.0870E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -6.060680  169.904011   -0.099258   -0.104494   -0.984946  2456367.598908
# Heliocentric elements and errors
Epoch:              2456360.5000  =  2013/03/09
Mean Anomaly:          315.71108 +/-     0.045
Argument of Peri:       78.38168 +/-     0.012
Long of Asc Node:      184.90981 +/-     0.000
Inclination:            21.85431 +/-     0.001
Eccentricity:         0.44196690 +/-    0.0005
Semi-Major Axis:     35.08094963 +/-    0.0211
Time of Perihelion: 2465697.2988 +/-       4.2
Perihelion:          19.57633119 +/-    0.0212
Aphelion:            50.58556808 +/-    0.0352
Period (y)              207.7855 +/-      0.19
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -28.60775358 +/-    0.0011
Ecliptic Y            4.99511117 +/-    0.0002
Ecliptic Z           -2.97805424 +/-    0.0001
Ecliptic XDOT         0.00078271 +/-    0.0000
Ecliptic YDOT        -0.00310185 +/-    0.0000
Ecliptic ZDOT         0.00126637 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   29.19286741 +/-    0.0010
Geocenter to KBO     28.20794382 +/-    0.0011
# Hcoef:  7.86

The following table shows the complete astrometric record for 13FJ28. 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 (13FJ28) followed by the observatory code and reference code for the source of the astrometry.

2013 03  16.09813  11 13 22.948  -01 34 38.51  22.2r 13FJ28    807  C~1LLf      
2013 03  16.09813  11 13 22.94   -01 34 39.1   22.6r 13FJ28    W84  C~2J9e      
2013 03  16.16724  11 13 22.537  -01 34 35.45        13FJ28    807  C~1LLf      
2013 03  16.16725  11 13 22.50   -01 34 35.7         13FJ28    W84  C~2J9e      
2013 03  16.23751  11 13 22.094  -01 34 31.87        13FJ28    807  C~1LLf      
2013 03  16.23751  11 13 22.06   -01 34 32.2         13FJ28    W84  C~2J9e      
2013 05  07.97839  11 09 17.402  -00 54 34.87  22.1r 13FJ28    807  C~1LLf      
2013 05  07.99901  11 09 17.345  -00 54 34.33        13FJ28    807  C~1LLf      
2013 05  09.00539  11 09 15.142  -00 53 59.67        13FJ28    807  C~1LLf      
2014 04  30.98902  11 18 53.665  -01 03 22.07  22.1r 13FJ28    304  C~1LLf      
2014 05  01.97679  11 18 50.396  -01 02 43.16        13FJ28    304  C~1LLf      
2015 03  16.18834  11 32 42.21   -01 45 09.4   22.3R 13FJ28    G37  C~1N7m      
2015 03  16.25628  11 32 41.74   -01 45 05.7         13FJ28    G37  C~1N7m      

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    -0.27
  2   0.0000     -0.12    -0.20       0.59     0.32
  3   0.0002     -6.99     0.27       0.99     0.12
  4   0.0002     -7.40    -0.14       0.54    -0.33
  5   0.0004    -14.84    -0.12       1.18    -0.30
  6   0.0004    -14.50     0.22       1.68     0.20
  7   0.1448  -4330.56     0.07     768.70     0.13
  8   0.1448  -4331.56     0.02     768.86    -0.08
  9   0.1476  -4375.57     0.01     787.79     0.10
 10   1.1250   3829.67     0.06    3669.65     0.20
 11   1.1277   3769.30    -0.14    3686.28     0.07
 12   1.9989  16285.32     0.26    6224.85    -0.10
 13   1.9991  16277.34    -0.22    6225.51    -0.06

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.

13FJ28    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        34.968    35.016    34.920
ecceobj         0.441     0.443     0.440
incobj         21.895    21.895    21.895
qmin           19.340    19.298    19.493
qmax           50.876    51.750    51.228
amean          34.560    34.968    35.237
amin           34.180    34.555    34.687
amax           35.315    35.920    35.923
emean           0.433     0.437     0.426
emin            0.424     0.429     0.411
emax            0.445     0.449     0.444
imean          22.105    21.742    22.712
imin           21.512    21.210    21.526
imax           22.421    22.080    23.616
excite_mean     0.574     0.573     0.575
fracstop        0.005     0.019     0.005
cjmean          2.669     2.669     2.669

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        82.2      87.1      85.0
kozaiamp          3.6       9.8       5.8