Orbit Fit and Astrometric record for 09JT18

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: 09JT18    
# Created Tue Oct 17 01:37:46 2017
# Orbit generated from Bernstein formalism
# Fitting    9 observations of    9
# Arc:  10.91d
# First observation: 2009/05/14
#  Last observation: 2009/05/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.023335  -0.000000   0.004995   0.024282   0.000000
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# Chi-squared of fit:     2.10 DOF:   13 RMS:  0.09
# Min/Max residuals:    -0.13    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.460564E-05  2.217020E-02  2.920061E-06  4.496464E-03  2.398443E-02  2.240854E-04
# Covariance matrix:
  1.2617E-12  1.0004E-09  2.6639E-13  4.2106E-10  3.1255E-10  7.4374E-09
  1.0004E-09  1.2811E-06  3.3607E-10  5.2889E-07  3.9376E-07  1.1501E-05
  2.6639E-13  3.3607E-10  5.4137E-13  1.2084E-10  1.0304E-10  2.2608E-09
  4.2106E-10  5.2889E-07  1.2084E-10  2.1965E-07  1.6277E-07  4.9103E-06
  3.1255E-10  3.9376E-07  1.0304E-10  1.6277E-07  1.2087E-07  2.9638E-06
  7.4374E-09  1.1501E-05  2.2608E-09  4.9103E-06  2.9638E-06 -1.1733E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
   15.110563  179.700240   -0.812011    0.156174   -0.578471  2454965.843927
# Heliocentric elements and errors
Epoch:              2454960.5000  =  2009/05/09
Mean Anomaly:          150.80005 +/-   214.573
Argument of Peri:      260.02935 +/-   260.029
Long of Asc Node:      128.49826 +/-     1.087
Inclination:            18.57279 +/-     0.240
Eccentricity:         0.05644426 +/-    0.0564
Semi-Major Axis:     40.26494325 +/-    1.8076
Time of Perihelion: 2415868.4858 +/- 2295376.4
Perihelion:          37.99221821 +/-    2.8415
Aphelion:            42.53766828 +/-    2.9685
Period (y)              255.5047 +/-     17.21
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.85215964 +/-    0.5835
Ecliptic Y           -0.60294045 +/-    0.0031
Ecliptic Z           10.86897858 +/-    0.1575
Ecliptic XDOT         0.00010083 +/-    0.0001
Ecliptic YDOT        -0.00252728 +/-    0.0001
Ecliptic ZDOT         0.00050209 +/-    0.0005
# Distances at JD0 (AU)
Heliocenter to KBO   42.27762032 +/-    0.5653
Geocenter to KBO     41.69371670 +/-    0.6044
# Hcoef:  9.09

The following table shows the complete astrometric record for 09JT18. 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 (09JT18) followed by the observatory code and reference code for the source of the astrometry.

2009 05  14.343161 12 23 26.048  +13 57 22.44  24.1i 09JT18    568  C~0aRT      
2009 05  14.388589 12 23 25.916  +13 57 22.50  24.6i 09JT18    568  C~0aRT      
2009 05  14.427572 12 23 25.807  +13 57 22.63  24.4i 09JT18    568  C~0aRT      
2009 05  22.250570 12 23 06.056  +13 57 16.29  25.5g 09JT18    568  C~0aRT      
2009 05  22.307228 12 23 05.922  +13 57 16.21  25.6g 09JT18    568  C~0aRU      
2009 05  22.362884 12 23 05.791  +13 57 15.99  25.3g 09JT18    568  C~0aRU      
2009 05  24.272180 12 23 01.671  +13 57 07.99  25.5g 09JT18    568  C~0aRU      
2009 05  24.329497 12 23 01.554  +13 57 07.61  25.3g 09JT18    568  C~0aRU      
2009 05  25.256021 12 22 59.669  +13 57 03.24        09JT18    568  C~0aRU      

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     0.00       0.00     0.01
  2   0.0001     -1.78    -0.00      -0.73    -0.02
  3   0.0002     -3.28     0.01      -1.26     0.06
  4   0.0216   -262.96     0.05    -124.85    -0.09
  5   0.0218   -264.71    -0.03    -125.72     0.00
  6   0.0220   -266.36    -0.05    -126.70    -0.03
  7   0.0272   -317.80    -0.06    -158.56    -0.09
  8   0.0273   -319.20     0.08    -159.61    -0.13
  9   0.0299   -342.44    -0.01    -174.83     0.28

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.

09JT18    quality flag:1

Type:       SCATEXTD  SCATNEAR  CENTAURR

axisobj        40.191    49.843    37.100
ecceobj         0.060     0.248     0.319
incobj         18.553    19.548    17.441
qmin           37.333    37.010    23.234
qmax           43.631    64.025    52.033
amean          40.374    50.221    37.263
amin           40.071    49.753    36.598
amax           40.689    50.787    38.204
emean           0.057     0.246     0.335
emin            0.040     0.232     0.306
emax            0.073     0.261     0.377
imean          17.225    18.423    12.745
imin           16.400    17.985     8.204
imax           18.142    18.935    15.949
excite_mean     0.302     0.401     0.404
fracstop        1.000     1.000     0.121
cjmean          2.955     2.975     2.849

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       185.2     192.2     233.0
kozaiamp        180.0     180.0     179.7