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 Fri Jul 20 01:37:59 2018
# Orbit generated from Bernstein formalism
# Fitting   16 observations of   17
# Arc:   7.13y
# First observation: 2012/02/28
#  Last observation: 2018/05/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000039   0.024595  -0.000006  -0.000891   0.024647   0.000000
# Chi-squared of fit:    19.99 DOF:   26 RMS:  0.20
# Min/Max residuals:    -0.59    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.878918E-05  2.456854E-02 -8.535105E-06 -8.903936E-04  2.474824E-02 -2.514688E-04
# Covariance matrix:
  1.5927E-12 -1.1966E-12 -5.7013E-14  4.6602E-14 -3.5597E-13 -5.9720E-12
 -1.1966E-12  1.0030E-12  5.0287E-14 -4.1346E-14  1.4416E-13  5.2552E-12
 -5.7013E-14  5.0287E-14  2.2167E-13 -5.0364E-14 -1.5329E-15  2.7574E-13
  4.6602E-14 -4.1346E-14 -5.0364E-14  2.0025E-14  2.7577E-15 -2.2796E-13
 -3.5597E-13  1.4416E-13 -1.5329E-15  2.7577E-15  1.0470E-12 -8.4750E-14
 -5.9720E-12  5.2552E-12  2.7574E-13 -2.2796E-13 -8.4750E-14  2.8753E-11
#      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:          345.87337 +/-     0.410
Argument of Peri:      145.09994 +/-     0.437
Long of Asc Node:       56.54244 +/-     0.004
Inclination:             3.23862 +/-     0.000
Eccentricity:         0.03140067 +/-    0.0001
Semi-Major Axis:     42.69968654 +/-    0.0076
Time of Perihelion: 2459649.6839 +/-     116.1
Perihelion:          41.35888798 +/-    0.0088
Aphelion:            44.04048509 +/-    0.0092
Period (y)              279.0264 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.08442010 +/-    0.0017
Ecliptic Y           -4.79510579 +/-    0.0002
Ecliptic Z            1.78994155 +/-    0.0001
Ecliptic XDOT         0.00033142 +/-    0.0000
Ecliptic YDOT        -0.00269161 +/-    0.0000
Ecliptic ZDOT        -0.00009961 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.40201089 +/-    0.0016
Geocenter to KBO     40.40691077 +/-    0.0017
# Hcoef:  6.51

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      
2018 05  20.14859  13 00 27.433  -04 08 54.73  22.9R 12DA99    705              
2018 05  20.20472  13 00 27.270  -04 08 53.99        12DA99    705              
2018 05  20.26028  13 00 27.079  -04 08 52.66        12DA99    705              

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 (  -0.64)      0.00 (   1.64)
  2   0.9120   7331.82     0.09    -194.97    -0.01
  3   0.9121   7330.93     0.13    -194.93     0.02
  4   0.9121   7329.87    -0.01    -194.70     0.24
  5   1.0320   4209.73    -0.01    -198.43     0.14
  6   1.0320   4208.69    -0.05    -198.44     0.16
  7   1.0321   4207.62    -0.11    -198.38     0.25
  8   1.9660  11048.55    -0.59    -365.57    -0.35
  9   1.9661  11048.11     0.10    -365.49    -0.26
 10   1.9661  11047.04     0.18    -365.64    -0.41
 11   2.0286   9365.83     0.14    -380.98    -0.25
 12   2.0286   9365.66     0.03    -380.63     0.09
 13   2.0287   9364.74     0.11    -380.51     0.24
 14   2.9079  17562.23    -0.02    -564.33     0.01
 15   7.1341  32554.56    -0.09   -1398.23    -0.00
 16   7.1343  32551.96     0.23   -1398.50    -0.08
 17   7.1344  32548.74    -0.13   -1398.39     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        42.680    42.703    42.657
ecceobj         0.030     0.031     0.030
incobj          3.239     3.239     3.239
qmin           40.600    40.603    40.536
qmax           45.409    45.497    45.432
amean          42.915    42.939    42.892
amin           42.588    42.603    42.568
amax           43.257    43.280    43.232
emean           0.030     0.031     0.030
emin            0.011     0.011     0.010
emax            0.050     0.051     0.051
imean           1.714     1.722     1.707
imin            0.686     0.705     0.666
imax            2.632     2.637     2.629
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       173.2     173.6     173.5
kozaiamp        180.0     180.0     180.0