Orbit Fit and Astrometric record for 12DY98

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: 12DY98    
# Created Thu Feb 22 02:37:56 2018
# Orbit generated from Bernstein formalism
# Fitting   24 observations of   25
# Arc:   9.81y
# First observation: 2005/06/01
#  Last observation: 2015/03/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.002247   0.038271   0.001075  -0.010256   0.025635   0.000000
# Chi-squared of fit:    17.83 DOF:   42 RMS:  0.15
# Min/Max residuals:    -0.61    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.959766E-05  3.470616E-02 -5.976132E-06 -9.423405E-03  2.811079E-02 -4.312990E-03
# Covariance matrix:
  4.8498E-13 -1.0519E-13 -1.7311E-14  1.5182E-14 -5.9117E-14 -1.5727E-13
 -1.0519E-13  9.2152E-14  2.5992E-14 -1.9912E-14 -4.9208E-14  2.1883E-13
 -1.7311E-14  2.5992E-14  4.0438E-13 -5.6286E-14 -1.4300E-14  6.7181E-14
  1.5182E-14 -1.9912E-14 -5.6286E-14  1.2092E-14  7.6479E-15 -5.2022E-14
 -5.9117E-14 -4.9208E-14 -1.4300E-14  7.6479E-15  1.8529E-13 -1.0056E-13
 -1.5727E-13  2.1883E-13  6.7181E-14 -5.2022E-14 -1.0056E-13  5.6896E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   10.660786  160.224108   -1.011877   -0.002230    0.012232  2453522.684469
# Heliocentric elements and errors
Epoch:              2453520.5000  =  2005/05/30
Mean Anomaly:          355.52305 +/-     0.002
Argument of Peri:      160.48008 +/-     0.005
Long of Asc Node:       15.74010 +/-     0.000
Inclination:            18.66770 +/-     0.000
Eccentricity:         0.50794673 +/-    0.0001
Semi-Major Axis:     71.39030434 +/-    0.0122
Time of Perihelion: 2456260.4135 +/-       0.8
Perihelion:          35.12783283 +/-    0.0081
Aphelion:           107.65277586 +/-    0.0192
Period (y)              603.2079 +/-      0.16
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -33.23292839 +/-    0.0005
Ecliptic Y           10.87044487 +/-    0.0002
Ecliptic Z            6.58072426 +/-    0.0001
Ecliptic XDOT        -0.00091410 +/-    0.0000
Ecliptic YDOT        -0.00327012 +/-    0.0000
Ecliptic ZDOT        -0.00097961 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.57948894 +/-    0.0005
Geocenter to KBO     35.57353168 +/-    0.0005
# Hcoef:  6.90

The following table shows the complete astrometric record for 12DY98. 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 (12DY98) followed by the observatory code and reference code for the source of the astrometry.

2005 06  01.183726 11 03 47.34   +17 34 37.9   22.4V 12DY98    645  C~2VVI      
2005 06  01.184555 11 03 47.34   +17 34 37.8   22.3V 12DY98    645  C~2VVI      
2005 06  01.187043 11 03 47.35   +17 34 37.8   23.5V 12DY98    645  C~2VVI      
2010 12  15.56114  11 52 39.030  +08 50 43.41  22.4r 12DY98    F51  C~1vWc      
2010 12  15.57016  11 52 39.036  +08 50 42.98  22.5w 12DY98    F51  C~1vWc      
2010 12  15.59097  11 52 39.073  +08 50 43.24  22.4w 12DY98    F51  C~1vWc      
2012 02  26.40700  11 56 41.343  +07 46 50.97  22.3w 12DY98    F51  C~1vWc      
2012 02  26.43582  11 56 41.185  +07 46 51.79  22.4w 12DY98    F51  C~1vWc      
2012 02  26.45023  11 56 41.116  +07 46 51.99  22.5w 12DY98    F51  C~1vWc      
2012 03  27.33691  11 54 04.609  +08 00 49.70  22.1w 12DY98    F51  C~1vWc      
2012 03  27.35135  11 54 04.534  +08 00 50.20  22.3w 12DY98    F51  C~1vWc      
2012 03  27.36579  11 54 04.458  +08 00 50.16  22.3w 12DY98    F51  C~1vWc      
2012 03  27.38025  11 54 04.384  +08 00 50.65  22.1w 12DY98    F51  C~1vWc      
2013 04  04.37291  12 00 00.533  +06 37 46.94  22.5w 12DY98    F51  C~1vWc      
2013 04  04.38765  12 00 00.457  +06 37 47.26  22.6w 12DY98    F51  C~1vWc      
2013 04  04.41709  12 00 00.297  +06 37 48.06  22.5w 12DY98    F51  C~1vWc      
2014 02  27.48530  12 09 42.396  +04 54 54.12  22.8w 12DY98    F51  C~1vWc      
2014 02  27.49755  12 09 42.351  +04 54 54.50  22.5w 12DY98    F51  C~1vWc      
2014 02  27.52220  12 09 42.217  +04 54 55.48  22.4w 12DY98    F51  C~1vWc      
2014 04  29.26288  12 04 40.232  +05 18 55.29  22.6w 12DY98    F51  C~1vWc      
2014 04  29.27476  12 04 40.178  +05 18 55.49  22.3w 12DY98    F51  C~1vWc      
2014 04  29.28667  12 04 40.124  +05 18 55.46  22.4w 12DY98    F51  C~1vWc      
2015 03  24.41786  12 14 08.341  +03 39 42.05  22.2w 12DY98    F51  C~1vWc      
2015 03  24.43232  12 14 08.283  +03 39 42.61  22.5w 12DY98    F51  C~1vWc      
2015 03  24.46132  12 14 08.103  +03 39 43.13  22.1w 12DY98    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    -0.02       0.00     0.14
  2   0.0000      0.04     0.01      -0.09     0.07
  3   0.0000      0.17     0.09      -0.04     0.18
  4   5.5397  53158.23    -0.03  -10944.18    -0.17
  5   5.5397  53158.52     0.06  -10944.55    -0.61
  6   5.5398  53158.92     0.00  -10944.06    -0.27
  7   6.7385  58453.13     0.10  -12925.77     0.15
  8   6.7385  58450.46    -0.10  -12926.06     0.03
  9   6.7386  58449.37     0.04  -12926.33    -0.16
 10   6.8204  55801.11    -0.19  -13181.22     0.10
 11   6.8204  55799.80    -0.22  -13181.25     0.25
 12   6.8205  55798.73    -0.00  -13181.79    -0.11
 13   6.8205  55797.44    -0.01  -13181.82     0.04
 14   7.8417  63363.71    -0.03  -15506.82    -0.10
 15   7.8418  63362.44    -0.01  -15507.02    -0.11
 16   7.8418  63359.71    -0.16  -15507.34    -0.03
 17   8.7428  75124.50     0.07  -17453.30    -0.07
 18   8.7428  75123.63     0.27  -17453.24     0.06
 19   8.7429  75121.09    -0.09  -17453.22     0.25
 20   8.9092  69853.79     0.19  -18133.84     0.11
 21   8.9092  69852.89     0.08  -18134.01     0.12
 22   8.9092  69852.10     0.09  -18134.41    -0.08
 23   9.8104  81559.94    -0.08  -20003.10     0.16
 24   9.8104  81558.74 (   0.14) -20002.95 (   0.46)
 25   9.8105  81555.69    -0.07  -20003.69     0.04

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.

12DY98    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        70.032    70.066    69.997
ecceobj         0.498     0.498     0.498
incobj         18.728    18.728    18.728
qmin           33.325    33.521    33.191
qmax          109.543   110.765   110.837
amean          70.211    70.864    70.453
amin           69.058    69.726    69.124
amax           71.857    72.595    72.446
emean           0.508     0.508     0.510
emin            0.490     0.490     0.492
emax            0.526     0.527     0.533
imean          17.638    18.209    17.487
imin           16.343    16.964    16.178
imax           19.043    19.284    19.026
excite_mean     0.591     0.596     0.592
fracstop        1.000     1.000     1.000
cjmean          2.936     2.936     2.936

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       203.8     203.1     206.5
kozaiamp        180.0     180.0     180.0