Orbit Fit and Astrometric record for 13FT28

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: 13FT28    
# Created Wed Oct 18 01:38:14 2017
# Orbit generated from Bernstein formalism
# Fitting   16 observations of   16
# Arc:   2.98y
# First observation: 2013/03/16
#  Last observation: 2016/03/09
Preliminary a, adot, b, bdot, g, gdot:
   0.000020   0.016312  -0.000047   0.004668   0.017403   0.000000
# Chi-squared of fit:     7.68 DOF:   26 RMS:  0.12
# Min/Max residuals:    -0.28    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.503155E-05  1.592747E-02  3.388673E-06  4.538224E-03  1.724617E-02 -9.221688E-03
# Covariance matrix:
  4.4847E-13 -8.2768E-14 -1.6041E-14  2.5234E-14  4.0152E-13  1.5961E-12
 -8.2768E-14  5.5338E-13 -4.4592E-14  1.5411E-13  2.7042E-13  1.1120E-11
 -1.6041E-14 -4.4592E-14  1.8459E-13 -9.5107E-14 -4.9519E-14 -1.1289E-12
  2.5234E-14  1.5411E-13 -9.5107E-14  1.2226E-13  1.2583E-13  3.7132E-12
  4.0152E-13  2.7042E-13 -4.9519E-14  1.2583E-13  7.5667E-13  8.7421E-12
  1.5961E-12  1.1120E-11 -1.1289E-12  3.7132E-12  8.7421E-12  2.6652E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -7.036164 -164.790833    0.331007   -0.114937   -0.931785  2456367.759258
# Heliocentric elements and errors
Epoch:              2456360.5000  =  2013/03/09
Mean Anomaly:          356.60044 +/-     0.040
Argument of Peri:       40.68190 +/-     0.042
Long of Asc Node:      217.67973 +/-     0.001
Inclination:            17.40287 +/-     0.001
Eccentricity:         0.85047031 +/-    0.0013
Semi-Major Axis:    291.01406301 +/-    2.2683
Time of Perihelion: 2473483.9030 +/-       3.4
Perihelion:          43.51524197 +/-    0.4994
Aphelion:           538.51288405 +/-    4.2135
Period (y)             4964.5417 +/-     58.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -56.52336805 +/-    0.0028
Ecliptic Y          -15.02234884 +/-    0.0007
Ecliptic Z           -7.10260458 +/-    0.0004
Ecliptic XDOT         0.00197395 +/-    0.0000
Ecliptic YDOT        -0.00208133 +/-    0.0000
Ecliptic ZDOT         0.00089449 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   58.91527045 +/-    0.0027
Geocenter to KBO     57.98388847 +/-    0.0029
# Hcoef:  6.75

The following table shows the complete astrometric record for 13FT28. 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 (13FT28) followed by the observatory code and reference code for the source of the astrometry.

2013 03  16.25848  12 44 55.262  -12 28 17.85  24.4r 13FT28    807  C~1x8W      
2013 03  16.30593  12 44 55.115  -12 28 16.92        13FT28    807  C~1x8W      
2013 03  16.36493  12 44 54.938  -12 28 16.01        13FT28    807  C~1x8W      
2013 05  08.01481  12 42 15.372  -12 08 25.96        13FT28    807  C~1x8W      
2013 05  08.10633  12 42 15.149  -12 08 23.97        13FT28    807  C~1x8W      
2013 05  08.19040  12 42 14.918  -12 08 22.16        13FT28    807  C~1x8W      
2013 07  08.00328  12 41 20.284  -11 53 07.17        13FT28    304  C~1x8W      
2013 07  08.05365  12 41 20.311  -11 53 07.10        13FT28    304  C~1x8W      
2014 05  01.16518  12 46 26.119  -12 18 15.90        13FT28    304  C~1x8W      
2014 05  01.20695  12 46 26.011  -12 18 14.59  24.1r 13FT28    304  C~1x8W      
2014 05  02.16275  12 46 23.351  -12 17 52.25        13FT28    304  C~1x8W      
2015 04  20.24921  12 50 56.670  -12 29 45.22        13FT28    304  C~1x8W      
2015 04  20.28162  12 50 56.584  -12 29 44.43        13FT28    304  C~1x8W      
2016 03  08.32581  12 57 13.500  -12 51 46.87        13FT28    304  C~1x8W      
2016 03  08.37846  12 57 13.345  -12 51 45.77        13FT28    304  C~1x8W      
2016 03  09.40246  12 57 10.408  -12 51 28.76        13FT28    304  C~1x8W      

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    -0.09       0.00     0.16
  2   0.0001     -2.35    -0.09       0.01     0.18
  3   0.0003     -5.09     0.08      -0.17     0.02
  4   0.1444  -2623.49     0.07     171.49     0.09
  5   0.1447  -2627.28     0.23     172.03     0.07
  6   0.1449  -2631.11     0.03     172.35    -0.13
  7   0.3114  -3729.63    -0.07     695.47    -0.01
  8   0.3116  -3729.30    -0.23     695.69    -0.27
  9   1.1250    988.09     0.03    1076.09    -0.28
 10   1.1251    986.12     0.05    1076.68     0.08
 11   1.1277    941.50    -0.04    1081.96    -0.06
 12   2.0944   4907.88    -0.08    1986.94    -0.01
 13   2.0945   4906.41     0.15    1987.18     0.10
 14   2.9790  10514.89     0.08    2892.91    -0.03
 15   2.9791  10512.37    -0.04    2893.06     0.16
 16   2.9819  10466.05    -0.09    2892.34    -0.07

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.

13FT28    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       284.318   290.716   278.228
ecceobj         0.847     0.851     0.844
incobj         17.431    17.432    17.431
qmin           40.450    40.368    40.713
qmax          591.383   612.343   577.964
amean         294.376   300.107   286.559
amin          281.185   286.941   274.166
amax          317.441   327.787   310.747
emean           0.852     0.856     0.848
emin            0.842     0.845     0.838
emax            0.863     0.868     0.860
imean          17.850    17.767    17.873
imin           17.282    17.251    17.426
imax           18.465    18.457    18.418
excite_mean     0.906     0.908     0.902
fracstop        1.000     1.000     1.000
cjmean          3.215     3.213     3.217

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        49.9      51.8      49.8
kozaiamp         12.0      12.3       9.8