Orbit Fit and Astrometric record for 11JW31

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: 11JW31    
# Created Tue Dec 12 02:37:45 2017
# Orbit generated from Bernstein formalism
# Fitting   46 observations of   46
# Arc:   5.17y
# First observation: 2011/04/28
#  Last observation: 2016/06/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000303   0.023519  -0.000002   0.000285   0.023348   0.000000
# Chi-squared of fit:     9.92 DOF:   86 RMS:  0.08
# Min/Max residuals:    -0.21    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.528493E-05  2.310335E-02  7.846703E-07  2.766443E-04  2.350751E-02 -1.337791E-03
# Covariance matrix:
  8.4656E-14 -7.4497E-14  4.9465E-16 -1.3322E-15  4.5723E-14 -7.3783E-13
 -7.4497E-14  1.4656E-13 -1.1798E-15  2.5761E-15 -3.2400E-15  1.5687E-12
  4.9465E-16 -1.1798E-15  5.3828E-14 -2.0111E-14 -3.6500E-19 -1.4364E-14
 -1.3322E-15  2.5761E-15 -2.0111E-14  1.8213E-14 -1.4359E-15  3.3732E-14
  4.5723E-14 -3.2400E-15 -3.6500E-19 -1.4359E-15  2.5281E-13 -4.5627E-13
 -7.3783E-13  1.5687E-12 -1.4364E-14  3.3732E-14 -4.5627E-13  1.9851E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.747528  -82.459147    0.876125    0.015294   -0.502102  2455679.793966
# Heliocentric elements and errors
Epoch:              2455670.5000  =  2011/04/19
Mean Anomaly:          309.72414 +/-     0.066
Argument of Peri:      126.78657 +/-     0.092
Long of Asc Node:      209.17969 +/-     0.010
Inclination:             1.87308 +/-     0.000
Eccentricity:         0.09805698 +/-    0.0001
Semi-Major Axis:     45.62755014 +/-    0.0041
Time of Perihelion: 2471392.0795 +/-      20.6
Perihelion:          41.15345058 +/-    0.0077
Aphelion:            50.10164969 +/-    0.0081
Period (y)              308.2116 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            4.78204057 +/-    0.0001
Ecliptic Y          -42.76495405 +/-    0.0009
Ecliptic Z            1.29730592 +/-    0.0000
Ecliptic XDOT         0.00264505 +/-    0.0000
Ecliptic YDOT         0.00051443 +/-    0.0000
Ecliptic ZDOT         0.00002749 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.05104191 +/-    0.0009
Geocenter to KBO     42.53958808 +/-    0.0009
# Hcoef:  9.28

The following table shows the complete astrometric record for 11JW31. 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 (11JW31) followed by the observatory code and reference code for the source of the astrometry.

2011 04  28.29320  18 32 24.85   -21 28 47.6         11JW31    268  C~0ljV      
2011 04  28.29388  18 32 24.84   -21 28 47.6         11JW31    268  C~0ljV      
2011 04  28.39916  18 32 24.62   -21 28 47.4         11JW31    268  C~0ljV      
2011 05  04.35789  18 32 11.36   -21 28 44.1         11JW31    268  C~0ljV      
2011 05  04.36394  18 32 11.35   -21 28 44.1         11JW31    268  C~0ljV      
2011 05  04.38104  18 32 11.30   -21 28 44.1         11JW31    268  C~0ljV      
2011 05  04.39888  18 32 11.25   -21 28 44.1         11JW31    268  C~0ljV      
2011 05  04.40573  18 32 11.24   -21 28 44.1         11JW31    268  C~0ljV      
2011 05  04.42148  18 32 11.20   -21 28 44.1         11JW31    268  C~0ljV      
2011 05  27.28690  18 30 54.80   -21 28 59.0         11JW31    268  C~0ljV      
2011 05  27.33105  18 30 54.62   -21 28 58.8         11JW31    268  C~0ljV      
2011 05  27.38632  18 30 54.36   -21 28 59.2         11JW31    268  C~0ljV      
2011 07  01.12040  18 28 10.60   -21 30 27.8         11JW31    269  C~0ljV      
2011 07  01.12099  18 28 10.60   -21 30 27.7         11JW31    269  C~0ljV      
2011 07  01.20571  18 28 10.16   -21 30 28.0         11JW31    269  C~0ljV      
2011 07  01.20630  18 28 10.17   -21 30 28.0         11JW31    269  C~0ljV      
2011 07  01.29082  18 28 09.74   -21 30 28.1   25.2R 11JW31    269  C~0ljV      
2011 07  01.29141  18 28 09.74   -21 30 28.2         11JW31    269  C~0ljV      
2012 04  17.38698  18 38 19.35   -21 23 13.5         11JW31    268  C~0ljV      
2012 04  17.41654  18 38 19.32   -21 23 13.4         11JW31    268  C~0ljV      
2012 04  18.26734  18 38 18.54   -21 23 11.9         11JW31    268  C~0ljV      
2012 04  18.31485  18 38 18.51   -21 23 11.9         11JW31    268  C~0ljV      
2012 04  18.31517  18 38 18.50   -21 23 11.9         11JW31    268  C~0ljV      
2012 04  18.36209  18 38 18.44   -21 23 11.8         11JW31    268  C~0ljV      
2012 04  18.36265  18 38 18.44   -21 23 11.8         11JW31    268  C~0ljV      
2012 04  18.40499  18 38 18.40   -21 23 11.7         11JW31    268  C~0ljV      
2012 04  18.40528  18 38 18.40   -21 23 11.7         11JW31    268  C~0ljV      
2012 04  19.30535  18 38 17.49   -21 23 10.3         11JW31    268  C~0ljV      
2012 04  19.30696  18 38 17.49   -21 23 10.3         11JW31    268  C~0ljV      
2012 04  19.31725  18 38 17.47   -21 23 10.3         11JW31    268  C~0ljV      
2012 04  19.33912  18 38 17.45   -21 23 10.2         11JW31    268  C~0ljV      
2012 04  19.35214  18 38 17.43   -21 23 10.2         11JW31    268  C~0ljV      
2012 04  19.36183  18 38 17.42   -21 23 10.2         11JW31    268  C~0ljV      
2012 04  19.36529  18 38 17.42   -21 23 10.1         11JW31    268  C~0ljV      
2012 04  19.39518  18 38 17.38   -21 23 10.1         11JW31    268  C~0ljV      
2012 04  19.39905  18 38 17.37   -21 23 10.1         11JW31    268  C~0ljV      
2012 04  19.40424  18 38 17.37   -21 23 10.1         11JW31    268  C~0ljV      
2012 04  19.41581  18 38 17.36   -21 23 10.1         11JW31    268  C~0ljV      
2014 06  25.38473  18 45 53.711  -21 11 48.96        11JW31    266  C~2Gt7      
2014 06  25.41031  18 45 53.586  -21 11 48.95        11JW31    266  C~2Gt7      
2014 06  25.45768  18 45 53.342  -21 11 49.30        11JW31    266  C~2Gt7      
2014 06  25.53035  18 45 52.981  -21 11 49.66        11JW31    266  C~2Gt7      
2014 06  27.35946  18 45 43.903  -21 11 58.91        11JW31    266  C~2Gt7      
2014 06  27.37088  18 45 43.843  -21 11 59.02        11JW31    266  C~2Gt7      
2016 06  30.38784  18 57 00.553  -20 56 22.39        11JW31    266  C~2Gt7      
2016 06  30.40322  18 57 00.479  -20 56 22.56        11JW31    266  C~2Gt7      

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     0.05       0.00    -0.12
  2   0.0000     -0.14    -0.07       0.01    -0.12
  3   0.0003     -3.19    -0.13       0.38     0.01
  4   0.0166   -187.81     0.03      14.02    -0.04
  5   0.0166   -187.95     0.11      14.03    -0.05
  6   0.0167   -188.64     0.02      14.07    -0.05
  7   0.0167   -189.34    -0.04      14.11    -0.05
  8   0.0167   -189.48     0.07      14.12    -0.06
  9   0.0168   -190.04     0.07      14.15    -0.07
 10   0.0794  -1255.67     0.17      57.62    -0.17
 11   0.0795  -1258.17     0.24      57.96     0.10
 12   0.0797  -1261.81    -0.19      57.75    -0.21
 13   0.1747  -3549.22    -0.08      87.01    -0.12
 14   0.1748  -3549.22    -0.03      87.11    -0.02
 15   0.1750  -3555.37    -0.17      87.12    -0.02
 16   0.1750  -3555.23     0.02      87.11    -0.03
 17   0.1752  -3561.23     0.01      87.31     0.14
 18   0.1752  -3561.23     0.05      87.21     0.04
 19   0.9722   4961.85    -0.09      32.52     0.01
 20   0.9723   4961.44    -0.10      32.65     0.06
 21   0.9746   4950.66    -0.10      34.86     0.09
 22   0.9747   4950.24     0.17      34.89     0.00
 23   0.9747   4950.10     0.03      34.90     0.01
 24   0.9749   4949.27    -0.12      35.05     0.05
 25   0.9749   4949.27    -0.11      35.05     0.05
 26   0.9750   4948.72    -0.03      35.19     0.08
 27   0.9750   4948.72    -0.03      35.19     0.08
 28   0.9774   4936.12     0.07      37.42     0.02
 29   0.9775   4936.12     0.10      37.42     0.02
 30   0.9775   4935.84    -0.02      37.44     0.01
 31   0.9775   4935.57     0.06      37.56     0.08
 32   0.9776   4935.29    -0.01      37.57     0.06
 33   0.9776   4935.15     0.00      37.58     0.05
 34   0.9776   4935.16     0.06      37.68     0.14
 35   0.9777   4934.60    -0.01      37.72     0.10
 36   0.9777   4934.46    -0.09      37.73     0.10
 37   0.9777   4934.46    -0.01      37.73     0.08
 38   0.9777   4934.32     0.04      37.74     0.06
 39   3.1597  11355.20    -0.04     261.61    -0.10
 40   3.1598  11353.46     0.03     261.76     0.04
 41   3.1599  11350.02    -0.05     261.68    -0.06
 42   3.1601  11344.94     0.04     261.71    -0.07
 43   3.1651  11217.27     0.08     262.30    -0.03
 44   3.1652  11216.42     0.04     262.25    -0.07
 45   5.1748  20792.76    -0.04     381.35     0.02
 46   5.1748  20791.70     0.01     381.28    -0.05

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.

11JW31    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.426    45.438    45.414
ecceobj         0.097     0.097     0.097
incobj          1.876     1.876     1.876
qmin           40.507    40.530    40.469
qmax           51.083    51.055    51.053
amean          45.639    45.652    45.627
amin           45.260    45.278    45.245
amax           46.042    46.065    46.027
emean           0.096     0.096     0.096
emin            0.082     0.083     0.083
emax            0.110     0.109     0.109
imean           3.158     3.156     3.160
imin            2.643     2.644     2.644
imax            3.591     3.591     3.589
excite_mean     0.111     0.111     0.111
fracstop        1.000     1.000     1.000
cjmean          3.106     3.106     3.106

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       179.2     179.0     179.2
kozaiamp        180.0     179.9     180.0