Orbit Fit and Astrometric record for 09JZ18

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: 09JZ18    
# Created Sat Dec 16 02:37:34 2017
# Orbit generated from Bernstein formalism
# Fitting   34 observations of   34
# Arc:  10.18y
# First observation: 2005/04/02
#  Last observation: 2015/06/08
Preliminary a, adot, b, bdot, g, gdot:
   0.000352   0.042399   0.003984  -0.012638   0.048008   0.000000
# Chi-squared of fit:    25.03 DOF:   62 RMS:  0.15
# Min/Max residuals:    -0.43    0.35
# Exact a, adot, b, bdot, g, gdot:
  1.798853E-05  3.842684E-02 -5.570197E-06 -1.137993E-02  3.289868E-02 -6.326254E-03
# Covariance matrix:
  2.5217E-13 -6.1192E-14 -9.7834E-15  1.2694E-14  4.0802E-14 -9.3436E-14
 -6.1192E-14  5.3028E-14  2.5152E-14 -1.5833E-14  5.3400E-14  1.1278E-13
 -9.7834E-15  2.5152E-14  1.9840E-13 -2.8484E-14  5.1321E-14  5.6016E-14
  1.2694E-14 -1.5833E-14 -2.8484E-14  7.8872E-15 -1.7224E-14 -3.5603E-14
  4.0802E-14  5.3400E-14  5.1321E-14 -1.7224E-14  2.5107E-13  1.1571E-13
 -9.3436E-14  1.1278E-13  5.6016E-14 -3.5603E-14  1.1571E-13  2.5375E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   17.749205  171.939627   -0.351812    0.283934   -0.886800  2453462.826768
# Heliocentric elements and errors
Epoch:              2453460.5000  =  2005/03/31
Mean Anomaly:          334.42653 +/-     0.005
Argument of Peri:      175.47318 +/-     0.006
Long of Asc Node:       37.23264 +/-     0.000
Inclination:            23.81844 +/-     0.000
Eccentricity:         0.25239351 +/-    0.0000
Semi-Major Axis:     39.62458522 +/-    0.0031
Time of Perihelion: 2459932.4136 +/-       0.9
Perihelion:          29.62359694 +/-    0.0029
Aphelion:            49.62557351 +/-    0.0043
Period (y)              249.4338 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -29.63921316 +/-    0.0004
Ecliptic Y            3.84053094 +/-    0.0001
Ecliptic Z            9.26623459 +/-    0.0001
Ecliptic XDOT        -0.00023749 +/-    0.0000
Ecliptic YDOT        -0.00320326 +/-    0.0000
Ecliptic ZDOT        -0.00106240 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   31.29050556 +/-    0.0004
Geocenter to KBO     30.39635996 +/-    0.0005
# Hcoef:  7.76

The following table shows the complete astrometric record for 09JZ18. 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 (09JZ18) followed by the observatory code and reference code for the source of the astrometry.

2005 04  02.326025 11 59 41.63   +19 26 23.1   22.7V 09JZ18    645  C~1vW3      
2005 04  02.326854 11 59 41.63   +19 26 23.1   22.2V 09JZ18    645  C~1vW3      
2005 04  02.329342 11 59 41.61   +19 26 23.1   23.2V 09JZ18    645  C~1vW3      
2005 06  07.175567 11 55 29.93   +19 14 54.9         09JZ18    645  C~1vW3      
2005 06  07.176400 11 55 29.93   +19 14 54.9         09JZ18    645  C~1vW3      
2005 06  07.178889 11 55 29.93   +19 14 54.8         09JZ18    645  C~1vW3      
2009 05  14.360998 12 24 56.810  +13 14 16.60  22.5i 09JZ18    568  C~0aRU      
2009 05  15.269616 12 24 53.280  +13 14 08.80  23.0g 09JZ18    568  C~0aRU      
2009 05  15.337143 12 24 53.010  +13 14 08.30  22.6i 09JZ18    568  C~0aRU      
2009 05  15.399171 12 24 52.760  +13 14 07.60  22.4i 09JZ18    568  C~0aRU      
2009 05  15.437580 12 24 52.610  +13 14 07.30  22.3i 09JZ18    568  C~0aRU      
2009 05  22.387021 12 24 28.330  +13 12 41.50  23.3g 09JZ18    568  C~0aRU      
2009 05  24.296150 12 24 22.540  +13 12 10.10  23.0g 09JZ18    568  C~0aRU      
2014 03  24.44823  13 05 29.694  +04 30 38.40  22.4w 09JZ18    F51  C~1vW3      
2014 03  24.46170  13 05 29.617  +04 30 38.70  22.5w 09JZ18    F51  C~1vW3      
2014 03  24.47522  13 05 29.522  +04 30 39.12  22.5w 09JZ18    F51  C~1vW3      
2014 04  29.26220  13 01 47.176  +04 46 21.33  22.1w 09JZ18    F51  C~1vW3      
2014 04  29.27409  13 01 47.101  +04 46 21.82  22.5w 09JZ18    F51  C~1vW3      
2014 04  29.29787  13 01 46.950  +04 46 22.01  22.5w 09JZ18    F51  C~1vW3      
2014 05  24.31367  12 59 42.787  +04 49 24.63  22.5w 09JZ18    F51  C~1vW3      
2014 05  24.32597  12 59 42.723  +04 49 24.66  22.8w 09JZ18    F51  C~1vW3      
2014 05  24.33825  12 59 42.695  +04 49 24.77  22.3w 09JZ18    F51  C~1vW3      
2014 05  24.35051  12 59 42.641  +04 49 24.99  22.3w 09JZ18    F51  C~1vW3      
2014 06  18.29342  12 58 36.631  +04 44 01.23  22.3w 09JZ18    F51  C~1vW3      
2014 06  18.31755  12 58 36.616  +04 44 00.67  22.5w 09JZ18    F51  C~1vW3      
2014 06  18.32965  12 58 36.601  +04 44 00.51  22.4w 09JZ18    F51  C~1vW3      
2015 03  27.46351  13 12 23.922  +02 46 10.69  22.3w 09JZ18    F51  C~1vW3      
2015 03  27.47859  13 12 23.836  +02 46 11.07  22.1w 09JZ18    F51  C~1vW3      
2015 03  27.49368  13 12 23.751  +02 46 11.67  22.3w 09JZ18    F51  C~1vW3      
2015 03  27.51175  13 12 23.616  +02 46 12.12  22.2w 09JZ18    F51  C~1vW3      
2015 06  08.26543  13 05 59.115  +03 03 22.92  22.7w 09JZ18    F51  C~1vW3      
2015 06  08.27718  13 05 59.086  +03 03 22.76  22.8w 09JZ18    F51  C~1vW3      
2015 06  08.28889  13 05 59.047  +03 03 22.59  22.6w 09JZ18    F51  C~1vW3      
2015 06  08.30063  13 05 59.022  +03 03 22.49  22.8w 09JZ18    F51  C~1vW3      

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     0.10       0.00     0.02
  2   0.0000      0.00     0.17       0.00     0.04
  3   0.0000     -0.26     0.14      -0.12    -0.03
  4   0.1803  -2956.05    -0.11   -2104.39    -0.08
  5   0.1803  -2956.05    -0.12   -2104.39    -0.04
  6   0.1803  -2956.00    -0.11   -2104.48    -0.04
  7   4.1151  29535.75     0.07  -10779.79     0.09
  8   4.1176  29492.27     0.06  -10809.97     0.06
  9   4.1178  29488.90    -0.02  -10812.19     0.15
 10   4.1179  29485.89    -0.03  -10814.46    -0.00
 11   4.1180  29484.02    -0.05  -10815.71     0.06
 12   4.1371  29199.65    -0.15  -11052.40    -0.02
 13   4.1423  29136.83    -0.09  -11118.76    -0.05
 14   8.9750  79687.86    -0.30  -23084.09     0.09
 15   8.9750  79686.53    -0.11  -23084.36    -0.00
 16   8.9751  79684.86    -0.25  -23084.66    -0.11
 17   9.0731  75823.65     0.31  -23802.27     0.07
 18   9.0731  75822.26     0.08  -23802.35     0.32
 19   9.0732  75819.90     0.03  -23803.26     0.04
 20   9.1417  73871.65     0.11  -24528.24    -0.39
 21   9.1417  73870.69    -0.13  -24528.67    -0.43
 22   9.1417  73870.21     0.12  -24528.77    -0.13
 23   9.1418  73869.29    -0.09  -24528.95     0.08
 24   9.2100  73068.11     0.09  -25316.84    -0.10
 25   9.2101  73068.20     0.35  -25317.49     0.03
 26   9.2101  73068.06     0.30  -25317.75     0.16
 27   9.9826  89659.01    -0.05  -26138.10    -0.04
 28   9.9826  89657.45     0.15  -26138.36    -0.08
 29   9.9827  89655.77     0.24  -26138.41     0.11
 30   9.9827  89653.40    -0.02  -26138.97    -0.18
 31  10.1819  83116.69    -0.20  -27967.09     0.12
 32  10.1819  83116.34    -0.14  -27967.46     0.12
 33  10.1820  83115.84    -0.22  -27967.91     0.04
 34  10.1820  83115.51    -0.13  -27968.19     0.13

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.

09JZ18    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.157    39.166    39.148
ecceobj         0.244     0.244     0.244
incobj         23.882    23.882    23.882
qmin           27.999    27.758    28.114
qmax           51.667    51.862    51.470
amean          39.455    39.454    39.455
amin           38.939    38.921    38.917
amax           40.070    40.067    40.073
emean           0.265     0.267     0.263
emin            0.241     0.242     0.240
emax            0.290     0.295     0.286
imean          22.606    22.516    22.686
imin           21.925    21.777    22.086
imax           23.481    23.485    23.483
excite_mean     0.467     0.467     0.467
fracstop        1.000     1.000     1.000
cjmean          2.801     2.801     2.802

libcent 0       180.4     179.2     178.8
libamp  0       121.9     120.0     123.9
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       188.8     189.6     187.1
kozaiamp        179.9     180.0     180.0