Orbit Fit and Astrometric record for 09DM143

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: 09DM143   
# Created Wed Dec 13 02:37:33 2017
# Orbit generated from Bernstein formalism
# Fitting   13 observations of   13
# Arc:  71.88d
# First observation: 2009/02/18
#  Last observation: 2009/05/01
Preliminary a, adot, b, bdot, g, gdot:
  -0.000011   0.037611  -0.000005   0.007519   0.028926   0.000000
# Chi-squared of fit:     1.91 DOF:   20 RMS:  0.07
# Min/Max residuals:    -0.12    0.14
# Exact a, adot, b, bdot, g, gdot:
  1.811766E-05  3.290076E-02  4.189385E-06  7.498266E-03  2.815645E-02  3.375316E-03
# Covariance matrix:
  3.1885E-13 -2.8703E-11  2.1661E-14  3.5492E-13 -3.1350E-12  3.2851E-10
 -2.8703E-11  4.9366E-08 -6.0777E-11  1.9358E-10  7.9822E-09 -7.3673E-08
  2.1661E-14 -6.0777E-11  2.9801E-13 -1.5650E-12 -1.0023E-11  4.8279E-11
  3.5492E-13  1.9358E-10 -1.5650E-12  1.7960E-11  3.8646E-11  1.3289E-09
 -3.1350E-12  7.9822E-09 -1.0023E-11  3.8646E-11  1.3117E-09 -7.3555E-09
  3.2851E-10 -7.3673E-08  4.8279E-11  1.3289E-09 -7.3555E-09  1.1157E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
   10.165633 -176.315298    0.553620    0.145444   -0.811088  2454881.095146
# Heliocentric elements and errors
Epoch:              2454880.5000  =  2009/02/18
Mean Anomaly:            8.70623 +/-     3.059
Argument of Peri:       19.16590 +/-     6.840
Long of Asc Node:      146.07856 +/-     0.181
Inclination:            16.32667 +/-     0.066
Eccentricity:         0.34139677 +/-    0.0148
Semi-Major Axis:     54.42010484 +/-    0.8993
Time of Perihelion: 2451334.2848 +/-    1243.0
Perihelion:          35.84125709 +/-    1.0017
Aphelion:            72.99895258 +/-    1.4518
Period (y)              401.4646 +/-      9.95
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.74147968 +/-    0.0449
Ecliptic Y           -1.75211068 +/-    0.0029
Ecliptic Z            6.26850746 +/-    0.0081
Ecliptic XDOT         0.00001697 +/-    0.0001
Ecliptic YDOT        -0.00320177 +/-    0.0000
Ecliptic ZDOT         0.00077548 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.32929186 +/-    0.0442
Geocenter to KBO     35.51583623 +/-    0.0457
# Hcoef:  9.85

The following table shows the complete astrometric record for 09DM143. 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 (09DM143) followed by the observatory code and reference code for the source of the astrometry.

2009 02  18.594380 12 29 45.201  +07 51 39.17  24.5i 09DM143   568  C~0aRQ      
2009 02  18.632292 12 29 45.067  +07 51 40.69  24.8i 09DM143   568  C~0aRQ      
2009 02  22.539875 12 29 30.432  +07 54 14.72  25.9g 09DM143   568  C~0aRQ      
2009 02  22.598496 12 29 30.204  +07 54 16.92  25.3g 09DM143   568  C~0aRQ      
2009 02  23.489931 12 29 26.735  +07 54 52.37  25.2g 09DM143   568  C~0aRQ      
2009 02  23.546087 12 29 26.507  +07 54 54.70  25.1g 09DM143   568  C~0aRQ      
2009 02  23.601690 12 29 26.287  +07 54 56.87  25.5g 09DM143   568  C~0aRQ      
2009 03  25.444265 12 27 09.547  +08 14 27.09        09DM143   568  C~0aRQ      
2009 04  27.267713 12 24 35.852  +08 30 33.70        09DM143   568  C~0aRQ      
2009 05  01.350349 12 24 19.628  +08 31 52.43        09DM143   568  C~0aRQ      
2009 05  01.393485 12 24 19.464  +08 31 53.04        09DM143   568  C~0aRQ      
2009 05  01.432744 12 24 19.308  +08 31 53.73        09DM143   568  C~0aRQ      
2009 05  01.471114 12 24 19.153  +08 31 54.35        09DM143   568  C~0aRQ      

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     0.00
  2   0.0001     -2.43     0.14       0.59     0.08
  3   0.0108   -263.38    -0.12      54.60     0.00
  4   0.0110   -267.37    -0.01      55.26    -0.08
  5   0.0134   -328.79    -0.03      67.09    -0.07
  6   0.0136   -332.83    -0.09      67.87     0.01
  7   0.0137   -336.69    -0.02      68.55    -0.00
  8   0.0954  -2666.11     0.05     329.02     0.09
  9   0.1853  -5144.14     0.03     306.60     0.05
 10   0.1965  -5396.43    -0.10     283.12     0.09
 11   0.1966  -5398.91     0.05     282.71    -0.02
 12   0.1967  -5401.31     0.03     282.42    -0.04
 13   0.1968  -5403.67    -0.01     282.08    -0.12

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.

09DM143    quality flag:1

Type:       SCATNEAR  8:3EEEEE  SCATNEAR

axisobj        54.234    57.455    51.640
ecceobj         0.340     0.391     0.300
incobj         16.323    16.228    16.492
qmin           34.751    34.343    34.899
qmax           75.802    82.903    69.678
amean          54.727    57.901    51.902
amin           54.101    57.074    51.349
amax           55.587    58.932    52.572
emean           0.348     0.396     0.308
emin            0.332     0.384     0.292
emax            0.365     0.407     0.326
imean          14.972    14.987    14.926
imin           14.210    14.639    14.170
imax           15.864    15.318    15.671
excite_mean     0.433     0.473     0.401
fracstop        1.000     1.000     1.000
cjmean          2.992     2.981     2.995

libcent 0      -180.0     180.9    -180.0
libamp  0      -180.0     148.7    -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       179.4     151.4     170.8
kozaiamp        179.9     180.0     180.0