Orbit Fit and Astrometric record for 09DT143

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: 09DT143   
# Created Tue Dec 19 02:37:33 2017
# Orbit generated from Bernstein formalism
# Fitting    8 observations of    8
# Arc:  63.83d
# First observation: 2009/02/22
#  Last observation: 2009/04/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000006   0.028578  -0.000000   0.014497   0.028824   0.000000
# Chi-squared of fit:     0.63 DOF:   10 RMS:  0.05
# Min/Max residuals:    -0.11    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.442382E-05  2.712100E-02  7.845510E-06  1.448577E-02  2.853763E-02 -2.682027E-03
# Covariance matrix:
  3.0918E-13  1.5395E-11 -1.6661E-14  4.8699E-14  3.4704E-12  1.4679E-10
  1.5395E-11  5.2779E-08 -3.8466E-11 -8.9972E-10  8.6404E-09 -4.1723E-08
 -1.6661E-14 -3.8466E-11  3.0492E-13 -1.5429E-12 -6.3883E-12  7.4791E-12
  4.8699E-14 -8.9972E-10 -1.5429E-12  6.9423E-11 -1.3976E-10  2.7806E-09
  3.4704E-12  8.6404E-09 -6.3883E-12 -1.3976E-10  1.4290E-09 -3.2971E-09
  1.4679E-10 -4.1723E-08  7.4791E-12  2.7806E-09 -3.2971E-09  9.8799E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   11.106749 -174.475021    0.523520    0.162660   -0.828485  2454885.013585
# Heliocentric elements and errors
Epoch:              2454880.5000  =  2009/02/18
Mean Anomaly:          306.76521 +/-     4.711
Argument of Peri:       87.26281 +/-     7.418
Long of Asc Node:      165.43676 +/-     0.156
Inclination:            30.17025 +/-     0.193
Eccentricity:         0.12047218 +/-    0.0317
Semi-Major Axis:     38.23474927 +/-    0.4674
Time of Perihelion: 2467650.1466 +/-    1105.5
Perihelion:          33.62852552 +/-    1.2798
Aphelion:            42.84097301 +/-    1.3203
Period (y)              236.4262 +/-      4.34
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.11366162 +/-    0.0453
Ecliptic Y           -2.87563943 +/-    0.0044
Ecliptic Z            6.75057781 +/-    0.0089
Ecliptic XDOT         0.00077362 +/-    0.0001
Ecliptic YDOT        -0.00253646 +/-    0.0000
Ecliptic ZDOT         0.00131404 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.87211780 +/-    0.0444
Geocenter to KBO     35.04145410 +/-    0.0464
# Hcoef: 10.37

The following table shows the complete astrometric record for 09DT143. 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 (09DT143) followed by the observatory code and reference code for the source of the astrometry.

2009 02  22.512819 12 37 58.107  +07 59 57.47  24.6i 09DT143   568  C~0aRR      
2009 02  22.558177 12 37 57.917  +07 59 59.55  25.9g 09DT143   568  C~0aRR      
2009 02  22.614326 12 37 57.696  +08 00 02.14  25.8g 09DT143   568  C~0aRR      
2009 02  23.506411 12 37 54.201  +08 00 42.89  26.1g 09DT143   568  C~0aRR      
2009 02  23.617499 12 37 53.745  +08 00 47.97  26.0g 09DT143   568  C~0aRR      
2009 03  25.427730 12 35 34.287  +08 23 16.73  24.8i 09DT143   568  C~0aRR      
2009 03  25.454711 12 35 34.147  +08 23 17.95  25.0i 09DT143   568  C~0aRR      
2009 04  27.338330 12 32 52.298  +08 42 37.63        09DT143   568  C~0aRR      

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     0.12       0.00     0.04
  2   0.0001     -3.42    -0.00       0.78    -0.01
  3   0.0003     -7.46     0.02       1.84     0.04
  4   0.0027    -71.34    -0.04      18.44    -0.02
  5   0.0030    -79.58    -0.11      20.38    -0.05
  6   0.0846  -2516.44     0.01     430.71    -0.03
  7   0.0847  -2518.83    -0.00     431.00     0.04
  8   0.1747  -5183.74    -0.00     540.45    -0.01

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.

09DT143    quality flag:2

Type:       SCATEXTD  SCATNEAR  SCATEXTD

axisobj        38.082    39.671    36.887
ecceobj         0.116     0.200     0.067
incobj         30.193    29.807    30.782
qmin           33.059    31.471    34.158
qmax           43.686    48.454    40.094
amean          38.202    39.460    37.032
amin           37.836    38.849    36.722
amax           38.584    40.316    37.342
emean           0.104     0.154     0.056
emin            0.077     0.085     0.037
emax            0.133     0.207     0.075
imean          29.735    29.491    30.307
imin           29.156    28.826    29.760
imax           30.450    30.179    30.900
excite_mean     0.507     0.517     0.508
fracstop        1.000     1.000     1.000
cjmean          2.735     2.733     2.726

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       185.0     179.3     177.8
kozaiamp        180.0     179.9     180.0