Orbit Fit and Astrometric record for 12DX98

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: 12DX98    
# Created Fri Oct 20 01:38:12 2017
# Orbit generated from Bernstein formalism
# Fitting   14 observations of   14
# Arc:   2.91y
# First observation: 2012/02/27
#  Last observation: 2015/01/25
Preliminary a, adot, b, bdot, g, gdot:
   0.000014   0.033538  -0.000030  -0.007793   0.028933   0.000000
# Chi-squared of fit:     3.83 DOF:   22 RMS:  0.09
# Min/Max residuals:    -0.18    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.901682E-05  3.371296E-02 -4.637344E-06 -7.846063E-03  2.907773E-02 -9.394684E-04
# Covariance matrix:
  4.8971E-13 -2.8115E-13 -2.0334E-15  7.9398E-15  6.0716E-13 -3.8953E-13
 -2.8115E-13  9.7331E-13  4.4554E-14 -1.9225E-13  1.1630E-13  8.3662E-12
 -2.0334E-15  4.4554E-14  1.8625E-13 -9.3615E-14  2.5042E-14  4.6541E-13
  7.9398E-15 -1.9225E-13 -9.3615E-14  1.3325E-13 -1.1008E-13 -2.0130E-12
  6.0716E-13  1.1630E-13  2.5042E-14 -1.1008E-13  1.5478E-12  4.6837E-12
 -3.8953E-13  8.3662E-12  4.6541E-13 -2.0130E-12  4.6837E-12  8.7350E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.587655 -171.946471    0.493199    0.008838   -0.861240  2455984.980206
# Heliocentric elements and errors
Epoch:              2455980.5000  =  2012/02/23
Mean Anomaly:          353.91510 +/-     0.041
Argument of Peri:      188.29676 +/-     0.073
Long of Asc Node:        9.70855 +/-     0.000
Inclination:            13.12990 +/-     0.001
Eccentricity:         0.26538069 +/-    0.0002
Semi-Major Axis:     47.80796728 +/-    0.0129
Time of Perihelion: 2458021.2986 +/-      13.7
Perihelion:          35.12065601 +/-    0.0127
Aphelion:            60.49527855 +/-    0.0184
Period (y)              330.5663 +/-      0.13
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -34.96842484 +/-    0.0015
Ecliptic Y           -4.44919766 +/-    0.0002
Ecliptic Z            0.35256318 +/-    0.0000
Ecliptic XDOT         0.00052007 +/-    0.0000
Ecliptic YDOT        -0.00312752 +/-    0.0000
Ecliptic ZDOT        -0.00073953 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.25209776 +/-    0.0014
Geocenter to KBO     34.39057422 +/-    0.0015
# Hcoef:  7.03

The following table shows the complete astrometric record for 12DX98. 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 (12DX98) followed by the observatory code and reference code for the source of the astrometry.

2012 02  27.47944  12 30 30.890  -02 39 16.56  22.6w 12DX98    F51  C~1vWc      
2012 02  27.49423  12 30 30.829  -02 39 16.51  22.9w 12DX98    F51  C~1vWc      
2012 02  27.52376  12 30 30.696  -02 39 15.80  22.9w 12DX98    F51  C~1vWc      
2012 04  12.34319  12 26 42.668  -02 18 17.36  22.5w 12DX98    F51  C~1vWc      
2012 04  12.35713  12 26 42.598  -02 18 17.01  22.2w 12DX98    F51  C~1vWc      
2012 04  12.37113  12 26 42.527  -02 18 16.62  22.4w 12DX98    F51  C~1vWc      
2012 04  12.38510  12 26 42.458  -02 18 16.24  22.3w 12DX98    F51  C~1vWc      
2013 03  19.48899  12 35 14.748  -03 40 38.70  22.4w 12DX98    F51  C~1vWc      
2013 03  19.50435  12 35 14.663  -03 40 38.52  22.5w 12DX98    F51  C~1vWc      
2013 03  19.51978  12 35 14.588  -03 40 37.96  22.4w 12DX98    F51  C~1vWc      
2013 03  19.53522  12 35 14.494  -03 40 37.53  22.4w 12DX98    F51  C~1vWc      
2015 01  25.53823  12 51 21.204  -06 16 39.75  22.8w 12DX98    F51  C~1vWc      
2015 01  25.55354  12 51 21.186  -06 16 39.45  22.8w 12DX98    F51  C~1vWc      
2015 01  25.58416  12 51 21.150  -06 16 39.41  22.8w 12DX98    F51  C~1vWc      

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    -0.14       0.00     0.08
  2   0.0000     -0.86     0.06      -0.31    -0.17
  3   0.0001     -2.97     0.08      -0.45    -0.17
  4   0.1228  -3639.84    -0.05    -192.64     0.09
  5   0.1229  -3640.95    -0.01    -192.73     0.07
  6   0.1229  -3642.08     0.01    -192.79     0.08
  7   0.1229  -3643.18     0.06    -192.85     0.10
  8   1.0568   5359.11    -0.02   -1710.97     0.12
  9   1.0569   5357.87     0.03   -1711.31    -0.14
 10   1.0569   5356.62     0.08   -1711.23     0.01
 11   1.0570   5355.15    -0.09   -1711.39    -0.07
 12   2.9105  22399.79     0.04   -4703.24    -0.18
 13   2.9105  22399.42    -0.05   -4703.07     0.09
 14   2.9106  22398.91     0.01   -4703.24     0.11

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.

12DX98    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        47.725    47.762    47.688
ecceobj         0.264     0.264     0.263
incobj         13.141    13.140    13.141
qmin           34.677    34.565    34.577
qmax           62.092    62.291    62.120
amean          47.797    47.798    47.796
amin           47.067    47.035    47.124
amax           48.625    48.702    48.591
emean           0.258     0.258     0.257
emin            0.234     0.238     0.237
emax            0.278     0.281     0.279
imean          13.793    13.591    13.833
imin           13.227    13.069    13.249
imax           14.622    14.126    14.484
excite_mean     0.351     0.349     0.351
fracstop        1.000     1.000     1.000
cjmean          2.994     2.996     2.994

libcent 0       180.2     180.4     180.7
libamp  0       161.5     170.0     156.0
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       205.4     183.5     190.4
kozaiamp        180.0     180.0     180.0