Orbit Fit and Astrometric record for 13KY18

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: 13KY18    
# Created Wed Oct 18 01:38:18 2017
# Orbit generated from Bernstein formalism
# Fitting   16 observations of   16
# Arc:   2.09y
# First observation: 2013/05/16
#  Last observation: 2015/06/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000285   0.037483   0.000013  -0.004234   0.033004   0.000000
# Chi-squared of fit:     6.23 DOF:   26 RMS:  0.11
# Min/Max residuals:    -0.21    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.745336E-05  3.721460E-02 -1.962473E-06 -4.194281E-03  3.358720E-02 -4.262196E-03
# Covariance matrix:
  4.2959E-13 -2.5362E-12 -4.4078E-14  3.4394E-13  1.1663E-13 -3.8965E-11
 -2.5362E-12  2.4623E-11  4.4482E-13 -3.4470E-12  1.2909E-13  3.9060E-10
 -4.4078E-14  4.4482E-13  1.5537E-13 -1.5381E-13  3.5813E-15  7.1000E-12
  3.4394E-13 -3.4470E-12 -1.5381E-13  6.3529E-13 -1.9665E-14 -5.5016E-11
  1.1663E-13  1.2909E-13  3.5813E-15 -1.9665E-14  4.4180E-13  2.2585E-12
 -3.8965E-11  3.9060E-10  7.1000E-12 -5.5016E-11  2.2585E-12  6.2342E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.792202 -110.176624    0.248562    0.030733   -0.982109  2456428.969528
# Heliocentric elements and errors
Epoch:              2456420.5000  =  2013/05/08
Mean Anomaly:          266.11843 +/-     0.185
Argument of Peri:      272.45531 +/-     0.159
Long of Asc Node:       84.37570 +/-     0.001
Inclination:             6.66867 +/-     0.001
Eccentricity:         0.12255255 +/-    0.0020
Semi-Major Axis:     30.06778661 +/-    0.0065
Time of Perihelion: 2472125.1568 +/-      30.5
Perihelion:          26.38290270 +/-    0.0607
Aphelion:            33.75267052 +/-    0.0609
Period (y)              164.8771 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -10.83551733 +/-    0.0002
Ecliptic Y          -28.76669944 +/-    0.0006
Ecliptic Z            0.93114901 +/-    0.0000
Ecliptic XDOT         0.00295714 +/-    0.0000
Ecliptic YDOT        -0.00073044 +/-    0.0000
Ecliptic ZDOT        -0.00035245 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   30.75383669 +/-    0.0005
Geocenter to KBO     29.77324392 +/-    0.0006
# Hcoef:  6.65

The following table shows the complete astrometric record for 13KY18. 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 (13KY18) followed by the observatory code and reference code for the source of the astrometry.

2013 05  16.46875  16 33 49.31   -20 09 02.5   21.2w 13KY18    F51  C~1tfQ      
2013 05  16.48047  16 33 49.23   -20 09 02.3   21.6w 13KY18    F51  C~1tfQ      
2013 06  07.41797  16 31 21.29   -20 04 37.1   21.5w 13KY18    F51  C~1tfQ      
2013 06  07.42969  16 31 21.21   -20 04 37.0   21.6w 13KY18    F51  C~1tfQ      
2013 06  07.44531  16 31 21.09   -20 04 36.9   21.5w 13KY18    F51  C~1tfQ      
2013 06  07.46094  16 31 20.99   -20 04 36.6   21.4w 13KY18    F51  C~1tfQ      
2013 07  01.32031  16 28 50.83   -20 00 35.7   21.6w 13KY18    F51  C~1tfQ      
2013 07  01.33203  16 28 50.76   -20 00 35.5   21.7w 13KY18    F51  C~1tfQ      
2013 07  01.34375  16 28 50.68   -20 00 35.6   21.5w 13KY18    F51  C~1tfQ      
2013 07  01.35938  16 28 50.60   -20 00 35.6   21.9w 13KY18    F51  C~1tfQ      
2014 04  03.57031  16 46 13.83   -20 47 20.9   21.7w 13KY18    F51  C~1tfQ      
2014 04  03.59766  16 46 13.76   -20 47 21.1   21.8w 13KY18    F51  C~1tfQ      
2014 04  03.60938  16 46 13.71   -20 47 20.7   21.9w 13KY18    F51  C~1tfQ      
2015 06  17.71477  16 48 09.43   -21 07 11.9   22.3  13KY18    D35  C~1tfQ      
2015 06  17.72924  16 48 09.34   -21 07 11.4   22.3  13KY18    D35  C~1tfQ      
2015 06  17.74009  16 48 09.27   -21 07 11.8   22.2  13KY18    D35  C~1tfQ      

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     0.01       0.00    -0.00
  2   0.0000     -1.14    -0.02       0.03     0.05
  3   0.0601  -2101.28     0.04     -46.04    -0.00
  4   0.0601  -2102.41     0.06     -46.11    -0.04
  5   0.0602  -2104.09    -0.11     -46.26    -0.15
  6   0.0602  -2105.53    -0.02     -46.18    -0.01
  7   0.1255  -4234.09     0.08    -129.00     0.09
  8   0.1256  -4235.10     0.03    -128.96     0.19
  9   0.1256  -4236.20    -0.12    -129.23    -0.03
 10   0.1256  -4237.31     0.04    -129.40    -0.14
 11   0.8819  10688.08     0.01    -846.01     0.14
 12   0.8819  10687.13     0.14    -846.33    -0.19
 13   0.8820  10686.38    -0.14    -846.02     0.12
 14   2.0869  12450.16    -0.09   -1825.66    -0.10
 15   2.0870  12448.84    -0.02   -1825.32     0.28
 16   2.0870  12447.92     0.10   -1825.84    -0.21

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.

13KY18    quality flag:2

Type:       CENTAURR  CENTAURR       1:1

axisobj        30.014    30.022    30.007
ecceobj         0.126     0.123     0.128
incobj          6.668     6.668     6.668
qmin           25.730    24.522    25.575
qmax           36.640    35.846    34.952
amean          30.119    30.111    30.110
amin           29.156    29.302    29.408
amax           32.400    31.098    30.879
emean           0.108     0.111     0.108
emin            0.076     0.079     0.084
emax            0.132     0.181     0.138
imean           5.249     5.174     5.327
imin            4.996     2.736     5.020
imax            7.802     6.675     6.610
excite_mean     0.142     0.143     0.143
fracstop        0.321     0.394     1.000
cjmean          2.978     2.978     2.979

libcent 0      -180.0    -180.0     178.3
libamp  0      -180.0    -180.0     159.6
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       183.3     185.0     180.1
kozaiamp        179.9     180.0     180.0