Orbit Fit and Astrometric record for 13PW74

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: 13PW74    
# Created Tue Oct 24 01:38:17 2017
# Orbit generated from Bernstein formalism
# Fitting   18 observations of   18
# Arc:   3.06y
# First observation: 2010/09/15
#  Last observation: 2013/10/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000070   0.029506   0.000054   0.013449   0.029675   0.000000
# Chi-squared of fit:     9.57 DOF:   30 RMS:  0.13
# Min/Max residuals:    -0.32    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.639128E-05  2.969827E-02  7.611041E-06  1.352884E-02  2.950341E-02  2.456167E-03
# Covariance matrix:
  1.1292E-12 -1.1515E-12  2.5363E-13 -4.1928E-13 -6.0325E-13 -8.6841E-12
 -1.1515E-12  1.7060E-12 -4.1530E-13  6.8283E-13  3.8184E-13  1.4126E-11
  2.5363E-13 -4.1530E-13  5.4384E-13 -3.4825E-13 -1.0909E-13 -3.6225E-12
 -4.1928E-13  6.8283E-13 -3.4825E-13  3.7241E-13  1.8767E-13  5.9597E-12
 -6.0325E-13  3.8184E-13 -1.0909E-13  1.8767E-13  1.4588E-12  3.9203E-12
 -8.6841E-12  1.4126E-11 -3.6225E-12  5.9597E-12  3.9203E-12  1.2331E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.358194  -24.124796   -0.282515   -0.139687   -0.950468  2455454.812616
# Heliocentric elements and errors
Epoch:              2455450.5000  =  2010/09/11
Mean Anomaly:           37.91059 +/-     0.075
Argument of Peri:      293.33160 +/-     0.108
Long of Asc Node:      353.57610 +/-     0.000
Inclination:            25.73813 +/-     0.001
Eccentricity:         0.12232014 +/-    0.0003
Semi-Major Axis:     38.29423743 +/-    0.0081
Time of Perihelion: 2446335.5016 +/-      17.8
Perihelion:          33.61008108 +/-    0.0141
Aphelion:            42.97839378 +/-    0.0152
Period (y)              236.9782 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.60210301 +/-    0.0013
Ecliptic Y          -13.84206805 +/-    0.0005
Ecliptic Z           -4.92664652 +/-    0.0002
Ecliptic XDOT         0.00149922 +/-    0.0000
Ecliptic YDOT         0.00235481 +/-    0.0000
Ecliptic ZDOT         0.00120896 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.85064718 +/-    0.0012
Geocenter to KBO     33.89438778 +/-    0.0014
# Hcoef:  7.25

The following table shows the complete astrometric record for 13PW74. 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 (13PW74) followed by the observatory code and reference code for the source of the astrometry.

2010 09  15.31185  22 43 29.002  -17 06 39.01  21.8i 13PW74    F51  C~1w3u      
2011 08  24.43345  22 50 54.897  -15 35 35.00  22.8w 13PW74    F51  C~1w3u      
2011 08  24.44745  22 50 54.818  -15 35 35.31  22.6w 13PW74    F51  C~1w3u      
2011 08  24.46142  22 50 54.748  -15 35 35.68  22.8w 13PW74    F51  C~1w3u      
2011 08  24.47540  22 50 54.662  -15 35 36.22  22.9w 13PW74    F51  C~1w3u      
2011 09  18.43523  22 48 31.917  -15 45 44.32  22.1i 13PW74    F51  C~1w3u      
2012 08  14.48285  22 56 56.557  -14 09 12.94  22.5w 13PW74    F51  C~1w3u      
2012 08  14.51294  22 56 56.402  -14 09 13.80  22.5w 13PW74    F51  C~1w3u      
2012 08  14.52797  22 56 56.306  -14 09 14.43  22.6w 13PW74    F51  C~1w3u      
2013 08  09.44903  23 02 28.064  -12 44 51.55  22.5w 13PW74    F51  C~1w3u      
2013 08  09.46327  23 02 27.983  -12 44 51.62  22.7w 13PW74    F51  C~1w3u      
2013 08  09.47752  23 02 27.922  -12 44 52.27  22.5w 13PW74    F51  C~1w3u      
2013 08  09.49176  23 02 27.853  -12 44 52.62  22.6w 13PW74    F51  C~1w3u      
2013 08  26.50107  23 00 57.867  -12 52 37.66  21.8i 13PW74    F51  C~1w3u      
2013 08  31.41375  23 00 30.326  -12 54 50.69  22.8w 13PW74    F51  C~1w3u      
2013 08  31.42825  23 00 30.239  -12 54 50.87  22.5w 13PW74    F51  C~1w3u      
2013 08  31.45718  23 00 30.075  -12 54 51.73  22.8w 13PW74    F51  C~1w3u      
2013 10  06.31948  22 57 15.486  -13 07 51.76  22.6w 13PW74    F51  C~1w3u      

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    -0.07
  2   0.9394   8028.64     0.07    2580.97     0.03
  3   0.9395   8027.46     0.13    2581.13     0.09
  4   0.9395   8026.39     0.27    2581.18     0.04
  5   0.9395   8025.03     0.14    2581.16    -0.08
  6   1.0079   5886.22    -0.23    2817.83     0.13
  7   1.9142  14906.24    -0.12    5306.50     0.02
  8   1.9143  14903.81    -0.03    5306.59    -0.04
  9   1.9143  14902.27    -0.32    5306.56    -0.15
 10   2.8998  21412.20     0.04    8054.64    -0.08
 11   2.8998  21411.07     0.04    8055.05     0.27
 12   2.8998  21409.98     0.08    8054.81    -0.04
 13   2.8999  21408.90     0.13    8054.89    -0.03
 14   2.9464  20001.54    -0.18    8151.19    -0.03
 15   2.9599  19575.02    -0.07    8188.77    -0.17
 16   2.9599  19573.77    -0.04    8189.11     0.04
 17   2.9600  19571.20    -0.04    8189.27    -0.05
 18   3.0582  16626.79     0.22    8596.04     0.12

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.

13PW74    quality flag:2

Type:       SCATEXTD  SCATNEAR  SCATEXTD

axisobj        38.158    38.183    38.134
ecceobj         0.120     0.121     0.119
incobj         25.741    25.741    25.741
qmin           32.649    31.989    32.868
qmax           43.862    44.951    43.681
amean          38.115    38.183    38.101
amin           37.804    37.801    37.782
amax           38.529    38.626    38.439
emean           0.109     0.120     0.110
emin            0.085     0.085     0.086
emax            0.141     0.164     0.137
imean          26.027    25.990    26.005
imin           25.109    24.932    25.171
imax           26.974    27.010    26.921
excite_mean     0.452     0.455     0.452
fracstop        1.000     1.000     1.000
cjmean          2.800     2.799     2.800

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       177.7     180.8     177.2
kozaiamp        179.9     180.0     180.0