Orbit Fit and Astrometric record for 12DA99

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: 12DA99    
# Created Wed Oct 18 01:38:10 2017
# Orbit generated from Bernstein formalism
# Fitting   13 observations of   14
# Arc:   2.91y
# First observation: 2012/02/28
#  Last observation: 2014/02/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000051   0.024603  -0.000006  -0.000891   0.024642   0.000000
# Chi-squared of fit:    15.68 DOF:   20 RMS:  0.19
# Min/Max residuals:    -0.61    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.829502E-05  2.456918E-02 -7.331418E-06 -8.911947E-04  2.474870E-02 -2.437250E-04
# Covariance matrix:
  5.4313E-12 -5.9839E-12 -1.4837E-13  1.9062E-13 -3.3507E-12 -6.0264E-11
 -5.9839E-12  6.9738E-12  1.7905E-13 -2.3070E-13  3.8800E-12  7.2975E-11
 -1.4837E-13  1.7905E-13  8.5838E-13 -4.7055E-13  1.0765E-13  1.9550E-12
  1.9062E-13 -2.3070E-13 -4.7055E-13  2.9915E-13 -1.3450E-13 -2.5192E-12
 -3.3507E-12  3.8800E-12  1.0765E-13 -1.3450E-13  3.3857E-12  4.2296E-11
 -6.0264E-11  7.2975E-11  1.9550E-12 -2.5192E-12  4.2296E-11  7.9689E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.539375 -173.455688   -0.080021    0.044271   -0.999012  2455652.913936
# Heliocentric elements and errors
Epoch:              2455650.5000  =  2011/03/30
Mean Anomaly:          346.41069 +/-     1.980
Argument of Peri:      144.54972 +/-     2.113
Long of Asc Node:       56.51885 +/-     0.017
Inclination:             3.23983 +/-     0.001
Eccentricity:         0.03131657 +/-    0.0003
Semi-Major Axis:     42.69863352 +/-    0.0082
Time of Perihelion: 2459497.4298 +/-     560.4
Perihelion:          41.36145898 +/-    0.0151
Aphelion:            44.03580807 +/-    0.0154
Period (y)              279.0160 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.08368040 +/-    0.0030
Ecliptic Y           -4.79500082 +/-    0.0004
Ecliptic Z            1.78995712 +/-    0.0001
Ecliptic XDOT         0.00033057 +/-    0.0000
Ecliptic YDOT        -0.00269172 +/-    0.0000
Ecliptic ZDOT        -0.00009966 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.40126537 +/-    0.0030
Geocenter to KBO     40.40616534 +/-    0.0030
# Hcoef:  6.47

The following table shows the complete astrometric record for 12DA99. 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 (12DA99) followed by the observatory code and reference code for the source of the astrometry.

2011 04  01.41317  12 28 03.049  -00 15 57.25  22.5w 12DA99    F51  C~1w3p      
2012 02  28.53053  12 35 26.794  -01 07 11.48  23.0w 12DA99    F51  C~1w3p      
2012 02  28.54495  12 35 26.741  -01 07 11.09  23.3w 12DA99    F51  C~1w3p      
2012 02  28.55939  12 35 26.682  -01 07 10.46  23.2w 12DA99    F51  C~1w3p      
2012 04  12.34319  12 32 15.610  -00 46 42.65  22.8w 12DA99    F51  C~1w3p      
2012 04  12.35713  12 32 15.546  -00 46 42.25  23.0w 12DA99    F51  C~1w3p      
2012 04  12.37113  12 32 15.482  -00 46 41.77  22.9w 12DA99    F51  C~1w3p      
2013 03  19.50355  12 39 09.586  -01 34 11.88  22.2w 12DA99    F51  C~1w3p      
2013 03  19.51900  12 39 09.561  -01 34 11.63  22.0w 12DA99    F51  C~1w3p      
2013 03  19.53443  12 39 09.492  -01 34 11.35  22.2w 12DA99    F51  C~1w3p      
2013 04  11.36790  12 37 26.317  -01 23 23.77  22.6w 12DA99    F51  C~1w3p      
2013 04  11.36856  12 37 26.316  -01 23 23.39  22.7w 12DA99    F51  C~1w3p      
2013 04  11.38224  12 37 26.263  -01 23 22.92  22.4w 12DA99    F51  C~1w3p      
2014 02  26.51509  12 45 41.784  -02 19 47.91  22.7w 12DA99    F51  C~1w3p      

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 (  -0.54)      0.00 (   1.39)
  2   0.9120   7331.82     0.07    -194.97    -0.11
  3   0.9121   7330.93     0.11    -194.93    -0.08
  4   0.9121   7329.87    -0.03    -194.70     0.14
  5   1.0320   4209.73     0.00    -198.43     0.06
  6   1.0320   4208.69    -0.03    -198.44     0.08
  7   1.0321   4207.62    -0.09    -198.38     0.17
  8   1.9660  11048.55    -0.61    -365.57    -0.28
  9   1.9661  11048.11     0.09    -365.49    -0.19
 10   1.9661  11047.04     0.17    -365.64    -0.34
 11   2.0286   9365.83     0.14    -380.98    -0.17
 12   2.0286   9365.66     0.02    -380.63     0.17
 13   2.0287   9364.74     0.11    -380.51     0.32
 14   2.9079  17562.23     0.04    -564.33     0.23

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.

12DA99    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.679    42.702    42.655
ecceobj         0.030     0.031     0.030
incobj          3.240     3.240     3.240
qmin           40.540    40.593    40.533
qmax           45.446    45.440    45.399
amean          42.914    42.938    42.891
amin           42.587    42.609    42.565
amax           43.253    43.280    43.238
emean           0.030     0.031     0.030
emin            0.010     0.012     0.010
emax            0.051     0.051     0.051
imean           1.716     1.722     1.710
imin            0.688     0.707     0.668
imax            2.636     2.636     2.636
excite_mean     0.043     0.043     0.043
fracstop        1.000     1.000     1.000
cjmean          3.086     3.087     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       173.1     173.6     173.3
kozaiamp        179.9     180.0     180.0