Orbit Fit and Astrometric record for 09DS143

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: 09DS143   
# Created Wed Oct 18 01:37:47 2017
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:   6.00y
# First observation: 2009/02/18
#  Last observation: 2015/02/18
Preliminary a, adot, b, bdot, g, gdot:
   0.000037   0.031346   0.000005   0.000475   0.027360   0.000000
# Chi-squared of fit:    16.17 DOF:   52 RMS:  0.13
# Min/Max residuals:    -0.76    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.812110E-05  3.133525E-02  3.219350E-08  4.671518E-04  2.736696E-02  1.362072E-03
# Covariance matrix:
  1.4500E-13  4.4108E-14  8.6481E-16  1.0684E-15  1.3504E-13  3.6354E-13
  4.4108E-14  3.0393E-13  3.5751E-16  4.5025E-15  1.6060E-13  1.7387E-12
  8.6481E-16  3.5751E-16  6.3908E-14 -1.2943E-14  1.3745E-15  2.3943E-15
  1.0684E-15  4.5025E-15 -1.2943E-14  1.2808E-14  2.7589E-15  2.6945E-14
  1.3504E-13  1.6060E-13  1.3745E-15  2.7589E-15  2.4200E-13  9.9277E-13
  3.6354E-13  1.7387E-12  2.3943E-15  2.6945E-14  9.9277E-13  1.0389E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   11.200440 -176.158949    0.555468    0.159824   -0.807107  2454881.122568
# Heliocentric elements and errors
Epoch:              2454880.5000  =  2009/02/18
Mean Anomaly:            4.70365 +/-     0.017
Argument of Peri:       76.67760 +/-     0.030
Long of Asc Node:       98.46859 +/-     0.001
Inclination:            11.00390 +/-     0.000
Eccentricity:         0.24194932 +/-    0.0001
Semi-Major Axis:     49.17902315 +/-    0.0042
Time of Perihelion: 2453234.6107 +/-       6.1
Perihelion:          37.28019205 +/-    0.0042
Aphelion:            61.07785425 +/-    0.0059
Period (y)              344.8880 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.61964103 +/-    0.0006
Ecliptic Y           -1.90709668 +/-    0.0000
Ecliptic Z            7.09769689 +/-    0.0001
Ecliptic XDOT         0.00009102 +/-    0.0000
Ecliptic YDOT        -0.00313287 +/-    0.0000
Ecliptic ZDOT         0.00007221 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.34986517 +/-    0.0006
Geocenter to KBO     36.54040603 +/-    0.0007
# Hcoef:  8.88

The following table shows the complete astrometric record for 09DS143. 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 (09DS143) followed by the observatory code and reference code for the source of the astrometry.

2009 02  18.621802 12 32 00.014  +08 44 49.77        09DS143   568  C~0aRR      
2009 02  19.478979 12 31 56.917  +08 45 20.32  23.7i 09DS143   568  C~0aRR      
2009 02  19.539669 12 31 56.683  +08 45 22.42  23.5i 09DS143   568  C~0aRR      
2009 02  19.626511 12 31 56.359  +08 45 25.47  24.3i 09DS143   568  C~0aRR      
2009 02  22.523989 12 31 45.446  +08 47 09.45  24.8g 09DS143   568  C~0aRR      
2009 02  22.582110 12 31 45.219  +08 47 11.58  24.6g 09DS143   568  C~0aRR      
2009 02  23.437549 12 31 41.905  +08 47 42.44  23.8i 09DS143   568  C~0aRR      
2009 02  23.474129 12 31 41.753  +08 47 43.67  24.4g 09DS143   568  C~0aRR      
2009 02  23.530270 12 31 41.532  +08 47 45.71  24.4g 09DS143   568  C~0aRR      
2009 02  23.585800 12 31 41.308  +08 47 47.77  24.5g 09DS143   568  C~0aRR      
2009 03  23.486653 12 29 34.477  +09 04 14.62        09DS143   568  C~0aRR      
2009 03  23.543331 12 29 34.191  +09 04 16.52        09DS143   568  C~0aRR      
2009 04  19.385560 12 27 24.520  +09 16 32.34        09DS143   568  C~0aRR      
2009 04  23.316967 12 27 07.120  +09 17 49.48        09DS143   568  C~0aRR      
2009 04  27.259808 12 26 50.385  +09 18 57.54        09DS143   568  C~0aRR      
2009 04  29.384481 12 26 41.699  +09 19 30.01        09DS143   568  C~0aRR      
2009 05  01.278316 12 26 34.171  +09 19 56.75        09DS143   568  C~0aRR      
2009 05  01.345028 12 26 33.907  +09 19 57.68        09DS143   568  C~0aRR      
2009 05  01.388163 12 26 33.748  +09 19 58.07        09DS143   568  C~0aRR      
2009 05  01.427412 12 26 33.583  +09 19 58.52        09DS143   568  C~0aRR      
2009 05  01.465679 12 26 33.430  +09 19 59.06        09DS143   568  C~0aRR      
2009 05  29.254376 12 25 12.117  +09 21 44.97        09DS143   568  C~0aRR      
2009 06  18.266712 12 24 54.453  +09 17 28.87        09DS143   568  C~0aRR      
2009 06  19.258597 12 24 54.581  +09 17 09.24        09DS143   568  C~0aRR      
2013 05  14.18625  12 52 16.35   +06 34 38.6   24.1R 09DS143   G37  C~1T0w      
2013 05  14.25730  12 52 16.12   +06 34 39.9         09DS143   G37  C~1T0w      
2015 02  18.33678  13 11 26.78   +04 29 51.2   23.9R 09DS143   695  C~1T0w      
2015 02  18.43039  13 11 26.50   +04 29 54.2         09DS143   695  C~1T0w      
2015 02  18.51933  13 11 26.26   +04 29 57.1         09DS143   695  C~1T0w      

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     0.05
  2   0.0023    -54.32     0.04       9.54     0.09
  3   0.0025    -58.34    -0.02      10.07    -0.00
  4   0.0028    -63.96     0.04      10.94    -0.03
  5   0.0107   -253.88    -0.06      41.22    -0.02
  6   0.0108   -257.81    -0.04      41.82     0.03
  7   0.0132   -315.20    -0.02      50.37     0.05
  8   0.0133   -317.75    -0.06      50.59    -0.07
  9   0.0134   -321.57    -0.00      51.14    -0.04
 10   0.0136   -325.44    -0.04      51.70     0.01
 11   0.0900  -2442.90     0.07     202.77     0.05
 12   0.0901  -2447.54     0.03     202.82     0.08
 13   0.1636  -4502.41     0.03     110.55    -0.08
 14   0.1744  -4769.53     0.06      78.63    -0.07
 15   0.1852  -5024.00    -0.02      42.35     0.02
 16   0.1910  -5154.94     0.13      20.92    -0.01
 17   0.1962  -5267.88    -0.12       1.08     0.09
 18   0.1964  -5271.83    -0.09       0.37     0.14
 19   0.1965  -5274.15     0.18      -0.21     0.05
 20   0.1966  -5276.57     0.09      -0.77    -0.06
 21   0.1967  -5278.86     0.07      -1.17    -0.03
 22   0.2728  -6426.14     0.11    -382.80    -0.03
 23   0.3276  -6564.52    -0.27    -721.86    -0.05
 24   0.3303  -6554.98    -0.12    -739.13     0.03
 25   4.2315  19754.77    -0.03     229.24    -0.76
 26   4.2317  19751.07     0.06     229.01     0.03
 27   5.9979  38878.54     0.13     576.82     0.15
 28   5.9981  38873.31    -0.13     577.80     0.10
 29   5.9984  38868.67    -0.02     578.94     0.27

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.

09DS143    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        49.009    49.021    48.996
ecceobj         0.239     0.240     0.239
incobj         10.999    10.999    10.999
qmin           36.653    36.666    36.672
qmax           62.420    62.481    62.451
amean          49.306    49.317    49.293
amin           48.835    48.851    48.831
amax           49.849    49.864    49.835
emean           0.240     0.240     0.240
emin            0.228     0.228     0.227
emax            0.254     0.254     0.254
imean           9.623     9.623     9.622
imin            9.103     9.102     9.099
imax           10.291    10.296    10.291
excite_mean     0.293     0.293     0.293
fracstop        1.000     1.000     1.000
cjmean          3.060     3.060     3.060

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       177.1     177.1     177.0
kozaiamp        179.9     179.9     180.0