Orbit Fit and Astrometric record for 09DR143

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: 09DR143   
# Created Sun Dec 17 02:37:33 2017
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:   6.00y
# First observation: 2009/02/18
#  Last observation: 2015/02/18
Preliminary a, adot, b, bdot, g, gdot:
   0.000186   0.019985  -0.000001  -0.000656   0.022035   0.000000
# Chi-squared of fit:     7.10 DOF:   44 RMS:  0.09
# Min/Max residuals:    -0.19    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.468141E-05  1.960687E-02 -9.555301E-08 -6.469950E-04  2.165121E-02 -2.927117E-03
# Covariance matrix:
  2.3511E-13  7.4942E-14 -1.6122E-15 -2.9126E-15  2.4718E-13  9.4959E-13
  7.4942E-14  2.5165E-13 -4.3204E-16 -8.3767E-15  1.9125E-13  2.2974E-12
 -1.6122E-15 -4.3204E-16  7.6113E-14 -1.5127E-14 -2.3749E-15 -5.1197E-15
 -2.9126E-15 -8.3767E-15 -1.5127E-14  1.3068E-14 -6.3616E-15 -8.0400E-14
  2.4718E-13  1.9125E-13 -2.3749E-15 -6.3616E-15  3.9820E-13  1.9559E-12
  9.4959E-13  2.2974E-12 -5.1197E-15 -8.0400E-14  1.9559E-12  2.2151E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    9.543239 -175.581155    0.563893    0.135464   -0.805721  2454881.111737
# Heliocentric elements and errors
Epoch:              2454880.5000  =  2009/02/18
Mean Anomaly:          278.34239 +/-     0.048
Argument of Peri:      200.90120 +/-     0.029
Long of Asc Node:       82.87589 +/-     0.002
Inclination:             9.54550 +/-     0.000
Eccentricity:         0.16155835 +/-    0.0002
Semi-Major Axis:     46.87359540 +/-    0.0062
Time of Perihelion: 2481468.4578 +/-      14.6
Perihelion:          39.30077490 +/-    0.0122
Aphelion:            54.44641590 +/-    0.0131
Period (y)              320.9228 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -46.26782210 +/-    0.0013
Ecliptic Y           -3.01507728 +/-    0.0001
Ecliptic Z            7.65740750 +/-    0.0002
Ecliptic XDOT         0.00054677 +/-    0.0000
Ecliptic YDOT        -0.00244161 +/-    0.0000
Ecliptic ZDOT        -0.00014215 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.99402029 +/-    0.0013
Geocenter to KBO     46.18679328 +/-    0.0013
# Hcoef:  7.73

The following table shows the complete astrometric record for 09DR143. 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 (09DR143) followed by the observatory code and reference code for the source of the astrometry.

2009 02  18.610971 12 31 25.362  +07 00 03.81        09DR143   568  C~0aRR      
2009 02  22.498993 12 31 13.164  +07 01 51.76        09DR143   568  C~0aRR      
2009 02  22.566350 12 31 12.934  +07 01 53.44        09DR143   568  C~0aRR      
2009 02  22.622633 12 31 12.746  +07 01 54.99        09DR143   568  C~0aRR      
2009 02  23.570079 12 31 09.654  +07 02 21.64        09DR143   568  C~0aRR      
2009 02  23.625785 12 31 09.460  +07 02 23.02        09DR143   568  C~0aRR      
2009 03  23.454594 12 29 24.304  +07 15 22.29  24.2g 09DR143   568  C~0aRR      
2009 03  23.510121 12 29 24.073  +07 15 23.65  24.6g 09DR143   568  C~0aRR      
2009 03  23.567054 12 29 23.853  +07 15 25.36  25.5g 09DR143   568  C~0aRR      
2009 04  19.321582 12 27 36.755  +07 25 37.05  24.3g 09DR143   568  C~0aRR      
2009 04  19.377144 12 27 36.537  +07 25 38.13  24.8g 09DR143   568  C~0aRR      
2009 04  19.448132 12 27 36.266  +07 25 39.53  24.7g 09DR143   568  C~0aRR      
2009 04  23.284996 12 27 22.123  +07 26 45.88  24.4g 09DR143   568  C~0aRR      
2009 04  23.340698 12 27 21.919  +07 26 46.76  24.6g 09DR143   568  C~0aRR      
2009 04  26.261626 12 27 11.505  +07 27 33.11        09DR143   568  C~0aRR      
2009 04  27.283412 12 27 07.946  +07 27 48.21        09DR143   568  C~0aRR      
2009 05  01.360988 12 26 54.156  +07 28 43.98        09DR143   568  C~0aRR      
2009 05  01.404204 12 26 54.012  +07 28 44.58        09DR143   568  C~0aRR      
2009 05  01.443475 12 26 53.882  +07 28 45.04        09DR143   568  C~0aRR      
2009 05  17.409957 12 26 08.037  +07 31 03.52        09DR143   568  C~0aRR      
2013 05  14.18219  12 42 40.93   +05 33 54.5   23.4R 09DR143   G37  C~1T0w      
2013 05  14.25103  12 42 40.71   +05 33 54.7         09DR143   G37  C~1T0w      
2015 02  18.33037  12 56 17.91   +04 00 43.7   23.6R 09DR143   695  C~1T0w      
2015 02  18.42395  12 56 17.66   +04 00 46.1         09DR143   695  C~1T0w      
2015 02  18.51303  12 56 17.42   +04 00 48.5         09DR143   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    -0.07       0.00    -0.08
  2   0.0106   -209.61     0.03      26.41     0.22
  3   0.0108   -213.42     0.02      26.58    -0.01
  4   0.0110   -216.60     0.01      26.88    -0.03
  5   0.0136   -269.44     0.02      32.93     0.09
  6   0.0137   -272.64    -0.00      33.04    -0.11
  7   0.0899  -2018.74    -0.04     123.11     0.04
  8   0.0901  -2022.43    -0.00     122.98    -0.07
  9   0.0902  -2026.12     0.14     123.25     0.21
 10   0.1635  -3731.57     0.03      50.05    -0.03
 11   0.1636  -3734.98    -0.06      49.75     0.01
 12   0.1638  -3739.23    -0.10      49.44     0.11
 13   0.1743  -3958.71    -0.06      26.67    -0.00
 14   0.1745  -3961.85    -0.02      26.28    -0.03
 15   0.1825  -4122.46    -0.14       7.24     0.10
 16   0.1853  -4177.06     0.01       0.05     0.02
 17   0.1964  -4387.51    -0.00     -30.27    -0.12
 18   0.1966  -4389.72    -0.00     -30.57    -0.07
 19   0.1967  -4391.68     0.03     -30.92    -0.09
 20   0.2404  -5072.76     0.21    -174.60    -0.18
 21   4.2315  11312.18     0.03    -683.18     0.26
 22   4.2317  11309.09    -0.04    -684.33    -0.19
 23   5.9979  24849.96    -0.03    -823.64    -0.07
 24   5.9981  24845.50     0.02    -822.97    -0.04
 25   5.9984  24841.18     0.01    -822.25     0.08

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.

09DR143    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.662    46.679    46.644
ecceobj         0.158     0.159     0.158
incobj          9.549     9.549     9.549
qmin           38.807    38.822    38.856
qmax           55.481    55.609    55.392
amean          46.962    46.979    46.945
amin           46.557    46.569    46.537
amax           47.439    47.450    47.416
emean           0.156     0.156     0.155
emin            0.141     0.141     0.141
emax            0.171     0.172     0.170
imean           7.740     7.739     7.742
imin            7.320     7.315     7.319
imax            8.273     8.272     8.279
excite_mean     0.206     0.206     0.206
fracstop        1.000     1.000     1.000
cjmean          3.086     3.086     3.086

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       181.6     181.6     181.9
kozaiamp        180.0     179.9     179.9