Orbit Fit and Astrometric record for 12UM177

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: 12UM177   
# Created Mon Dec 18 02:37:52 2017
# Orbit generated from Bernstein formalism
# Fitting   19 observations of   19
# Arc:   1.46y
# First observation: 2011/08/31
#  Last observation: 2013/02/14
Preliminary a, adot, b, bdot, g, gdot:
  -0.000093   0.024181  -0.000020  -0.001544   0.024273   0.000000
# Chi-squared of fit:     7.81 DOF:   32 RMS:  0.11
# Min/Max residuals:    -0.27    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.566182E-05  2.409374E-02 -1.431108E-06 -1.598483E-03  2.432521E-02  1.425493E-03
# Covariance matrix:
  4.8652E-13  6.5044E-14  4.6312E-15 -5.0325E-14  4.6763E-13  2.2017E-11
  6.5044E-14  1.1557E-12  1.2455E-14 -1.1796E-13  1.0515E-12  5.1065E-11
  4.6312E-15  1.2455E-14  3.2983E-13 -2.9579E-13  9.7413E-15  1.1557E-12
 -5.0325E-14 -1.1796E-13 -2.9579E-13  3.5972E-13 -1.4138E-13 -8.0257E-12
  4.6763E-13  1.0515E-12  9.7413E-15 -1.4138E-13  1.4048E-12  6.2957E-11
  2.2017E-11  5.1065E-11  1.1557E-12 -8.0257E-12  6.2957E-11  3.3702E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   16.040084   31.418580    0.813726    0.163611   -0.569192  2455804.994306
# Heliocentric elements and errors
Epoch:              2455800.5000  =  2011/08/27
Mean Anomaly:           36.62520 +/-     1.428
Argument of Peri:       60.77007 +/-     1.695
Long of Asc Node:      287.77008 +/-     0.005
Inclination:            16.17380 +/-     0.000
Eccentricity:         0.06302475 +/-    0.0017
Semi-Major Axis:     43.84053062 +/-    0.0096
Time of Perihelion: 2445013.7740 +/-     420.4
Perihelion:          41.07749230 +/-    0.0741
Aphelion:            46.60356895 +/-    0.0743
Period (y)              290.2832 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           34.64936293 +/-    0.0017
Ecliptic Y           20.21116580 +/-    0.0010
Ecliptic Z           11.35895575 +/-    0.0006
Ecliptic XDOT        -0.00124278 +/-    0.0000
Ecliptic YDOT         0.00242588 +/-    0.0000
Ecliptic ZDOT        -0.00012852 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.69047194 +/-    0.0015
Geocenter to KBO     41.10961294 +/-    0.0020
# Hcoef:  8.63

The following table shows the complete astrometric record for 12UM177. 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 (12UM177) followed by the observatory code and reference code for the source of the astrometry.

2011 08  31.49354  01 32 22.783  +26 55 22.75        12UM177   568  C~1C6U      
2011 08  31.60075  01 32 22.433  +26 55 22.71  24.9r 12UM177   568  C~1C6U      
2011 09  05.50667  01 32 06.190  +26 55 25.48  24.6r 12UM177   568  C~1C6U      
2011 11  24.35087  01 25 59.785  +26 24 38.62  24.6r 12UM177   568  C~1C6U      
2011 11  30.30665  01 25 38.631  +26 21 03.80  25.2r 12UM177   568  C~1C6U      
2012 08  18.53950  01 38 48.106  +27 19 57.18        12UM177   568  C~1C6U      
2012 08  23.59114  01 38 36.931  +27 20 45.39  24.3r 12UM177   568  C~1C6U      
2012 08  23.59986  01 38 36.922  +27 20 45.36  24.8r 12UM177   568  C~1C6U      
2012 08  28.46759  01 38 24.093  +27 21 16.40        12UM177   568  C~1C6U      
2012 09  14.43438  01 37 25.301  +27 21 01.55        12UM177   568  C~1C6U      
2012 10  19.37301  01 34 38.987  +27 10 59.28  24.7r 12UM177   568  C~1C6U      
2012 10  19.41579  01 34 38.768  +27 10 57.95        12UM177   568  C~1C6U      
2012 10  20.36510  01 34 33.924  +27 10 32.53  24.9r 12UM177   568  C~1C6U      
2012 10  20.40352  01 34 33.728  +27 10 31.38  25.0r 12UM177   568  C~1C6U      
2012 10  20.44249  01 34 33.514  +27 10 30.38  24.4r 12UM177   568  C~1C6U      
2012 10  21.42663  01 34 28.474  +27 10 03.21  24.9r 12UM177   568  C~1C6U      
2012 11  14.36317  01 32 32.257  +26 57 20.36  24.4r 12UM177   568  C~1C6U      
2013 02  06.23610  01 31 15.355  +26 19 37.19  24.6r 12UM177   568  C~1C6U      
2013 02  14.23326  01 31 43.711  +26 19 00.53  24.5r 12UM177   568  C~1C6U      

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     0.00       0.00     0.08
  2   0.0003     -4.34    -0.16       1.75    -0.15
  3   0.0137   -204.14     0.12      87.07    -0.02
  4   0.2323  -5448.89     0.05     283.56     0.09
  5   0.2486  -5794.92    -0.00     197.55     0.09
  6   0.9666   5322.79     0.15    -561.26    -0.12
  7   0.9804   5202.11    -0.03    -461.47    -0.12
  8   0.9804   5201.99     0.09    -461.45    -0.27
  9   0.9938   5054.53    -0.11    -369.43     0.09
 10   1.0402   4321.11     0.02     -92.93     0.25
 11   1.1359   2038.72    -0.07     177.86     0.11
 12   1.1360   2035.51    -0.09     177.73    -0.08
 13   1.1386   1966.05     0.09     178.53     0.09
 14   1.1387   1963.19     0.10     178.45    -0.03
 15   1.1388   1960.17    -0.01     178.60     0.08
 16   1.1415   1887.63    -0.19     178.77     0.01
 17   1.2070    161.92     0.02      60.55    -0.21
 18   1.4367  -1654.81     0.12   -1637.99    -0.02
 19   1.4586  -1316.52    -0.08   -1817.63     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.

12UM177    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.930    43.964    43.900
ecceobj         0.065     0.070     0.061
incobj         16.175    16.175    16.175
qmin           40.320    40.104    40.549
qmax           47.063    47.408    46.834
amean          43.606    43.639    43.576
amin           43.265    43.303    43.241
amax           43.954    44.001    43.933
emean           0.059     0.064     0.054
emin            0.046     0.052     0.042
emax            0.071     0.078     0.066
imean          17.801    17.796    17.803
imin           17.395    17.376    17.406
imax           18.197    18.214    18.200
excite_mean     0.311     0.312     0.310
fracstop        1.000     1.000     1.000
cjmean          2.978     2.977     2.978

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       175.0     174.2     175.5
kozaiamp        180.0     180.0     180.0