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 Sun Feb 18 02:37:50 2018
# Orbit generated from Bernstein formalism
# Fitting   19 observations of   19
# Arc:  12.87y
# First observation: 2002/03/12
#  Last observation: 2015/01/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.008735   0.035644   0.001608  -0.007680   0.031466   0.000000
# Chi-squared of fit:     8.33 DOF:   32 RMS:  0.12
# Min/Max residuals:    -0.30    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.746851E-05  3.227300E-02 -3.695336E-06 -6.987788E-03  2.845264E-02 -3.647656E-03
# Covariance matrix:
  6.9639E-13 -1.5617E-13 -4.6089E-14  2.4106E-14 -2.1961E-13 -2.3661E-13
 -1.5617E-13  5.8841E-14  2.1245E-14 -1.1419E-14  6.5474E-14  1.1269E-13
 -4.6089E-14  2.1245E-14  4.3481E-13 -4.4528E-14  2.8221E-14  4.3900E-14
  2.4106E-14 -1.1419E-14 -4.4528E-14  6.8694E-15 -1.2757E-14 -2.3716E-14
 -2.1961E-13  6.5474E-14  2.8221E-14 -1.2757E-14  3.6782E-13  1.2123E-13
 -2.3661E-13  1.1269E-13  4.3900E-14 -2.3716E-14  1.2123E-13  2.3429E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.880075  168.746461   -0.052860    0.084344   -0.988857  2452345.762252
# Heliocentric elements and errors
Epoch:              2452340.5000  =  2002/03/07
Mean Anomaly:          343.56640 +/-     0.005
Argument of Peri:      187.69293 +/-     0.006
Long of Asc Node:        9.70894 +/-     0.000
Inclination:            13.10909 +/-     0.000
Eccentricity:         0.26945103 +/-    0.0001
Semi-Major Axis:     48.13896419 +/-    0.0057
Time of Perihelion: 2457909.4541 +/-       1.2
Perihelion:          35.16787058 +/-    0.0053
Aphelion:            61.11005780 +/-    0.0080
Period (y)              334.0053 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.32829517 +/-    0.0007
Ecliptic Y            6.98071274 +/-    0.0001
Ecliptic Z            2.98978424 +/-    0.0001
Ecliptic XDOT        -0.00032757 +/-    0.0000
Ecliptic YDOT        -0.00310391 +/-    0.0000
Ecliptic ZDOT        -0.00069960 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.13526809 +/-    0.0007
Geocenter to KBO     35.14612840 +/-    0.0007
# Hcoef:  6.98

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.

2002 03  12.261509 11 26 20.47   +08 56 23.1   22.4V 12DX98    645  C~2VVI      
2002 03  12.262339 11 26 20.45   +08 56 23.3   21.6V 12DX98    645  C~2VVI      
2006 01  07.515007 11 55 14.55   +04 02 30.0   22.4V 12DX98    645  C~2VVI      
2006 01  07.515837 11 55 14.55   +04 02 29.9   22.2V 12DX98    645  C~2VVI      
2006 01  07.518324 11 55 14.56   +04 02 30.0   24.0V 12DX98    645  C~2VVI      
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     0.10       0.00    -0.04
  2   0.0000     -0.35    -0.18       0.07     0.03
  3   3.8255  30984.90    -0.02   -5793.43    -0.03
  4   3.8255  30984.94     0.04   -5793.53    -0.12
  5   3.8255  30985.04     0.18   -5793.37     0.03
  6   9.9636  72457.15    -0.30  -15354.92     0.15
  7   9.9637  72456.19    -0.07  -15355.26    -0.12
  8   9.9638  72453.82    -0.05  -15355.41    -0.12
  9  10.0865  68390.64    -0.06  -15572.78     0.15
 10  10.0865  68389.41    -0.01  -15572.88     0.13
 11  10.0865  68388.16     0.01  -15572.95     0.14
 12  10.0866  68386.94     0.06  -15573.01     0.16
 13  11.0205  78604.32     0.05  -17175.13     0.12
 14  11.0205  78602.91     0.12  -17175.49    -0.16
 15  11.0206  78601.47     0.17  -17175.41     0.00
 16  11.0206  78599.79    -0.01  -17175.58    -0.08
 17  12.8741  98874.82     0.04  -20484.60    -0.29
 18  12.8742  98874.36    -0.07  -20484.41     0.01
 19  12.8743  98873.74     0.00  -20484.59     0.03

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        47.715    47.732    47.699
ecceobj         0.264     0.264     0.263
incobj         13.140    13.140    13.140
qmin           34.588    34.631    34.473
qmax           62.167    62.084    62.073
amean          47.797    47.797    47.797
amin           47.099    47.083    47.116
amax           48.609    48.620    48.595
emean           0.257     0.258     0.258
emin            0.236     0.235     0.235
emax            0.279     0.277     0.279
imean          13.834    13.792    13.799
imin           13.155    13.198    13.161
imax           14.590    14.611    14.557
excite_mean     0.351     0.351     0.352
fracstop        1.000     1.000     1.000
cjmean          2.994     2.994     2.994

libcent 0       179.4     180.3     180.2
libamp  0       159.7     161.9     157.6
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       195.3     205.2     191.2
kozaiamp        180.0     180.0     180.0