Orbit Fit and Astrometric record for 12UR177

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: 12UR177   
# Created Tue Nov 20 02:09:22 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   28 observations of   28
# Arc:   6.30y
# First observation: 2011/09/01
#  Last observation: 2017/12/20
# Chi-squared of fit:     9.88 DOF:   50 RMS:  0.10
# Min/Max residuals:    -0.19    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.573081E-05  2.428172E-02 -1.482925E-06 -1.352428E-03  2.281866E-02 -7.541786E-03
# Covariance matrix:
  3.3995E-13 -3.5351E-13 -1.7373E-14  2.2166E-14 -7.3734E-14 -2.2838E-12
 -3.5351E-13  5.6564E-13  2.8459E-14 -3.4894E-14  2.4467E-13  3.6660E-12
 -1.7373E-14  2.8459E-14  1.0054E-13 -3.5231E-14  1.2061E-14  1.9371E-13
  2.2166E-14 -3.4894E-14 -3.5231E-14  2.5664E-14 -1.3610E-14 -2.3950E-13
 -7.3734E-14  2.4467E-13  1.2061E-14 -1.3610E-14  2.0667E-13  1.4912E-12
 -2.2838E-12  3.6660E-12  1.9371E-13 -2.3950E-13  1.4912E-12  2.5058E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   16.301812   33.196334    0.822534    0.162632   -0.556228  2455805.919486
# Heliocentric elements and errors
Epoch:              2455806.5000  =  2011/09/02
Mean Anomaly:          341.18717 +/-     0.008
Argument of Peri:      157.48920 +/-     0.020
Long of Asc Node:      291.52208 +/-     0.001
Inclination:            16.35056 +/-     0.000
Eccentricity:         0.49624649 +/-    0.0002
Semi-Major Axis:     74.66710015 +/-    0.0204
Time of Perihelion: 2468121.7738 +/-      91.5
Perihelion:          37.61381374 +/-    0.0185
Aphelion:           111.72038656 +/-    0.0341
Period (y)              645.2115 +/-      0.26
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.13598649 +/-    0.0007
Ecliptic Y           22.65959716 +/-    0.0005
Ecliptic Z           12.30117221 +/-    0.0002
Ecliptic XDOT        -0.00228694 +/-    0.0000
Ecliptic YDOT         0.00199273 +/-    0.0000
Ecliptic ZDOT        -0.00040968 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.39152129 +/-    0.0006
Geocenter to KBO     43.82402161 +/-    0.0009
# Hcoef:  7.96

The following table shows the complete astrometric record for 12UR177. 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 (12UR177) followed by the observatory code and reference code for the source of the astrometry.

2011 09  01.41872  01 39 03.099  +27 48 41.72  24.2r 12UR177   568  C~1CL9      
2011 09  01.46443  01 39 02.955  +27 48 41.54  24.3r 12UR177   568  C~1CL9      
2011 09  05.44695  01 38 51.068  +27 48 50.60  24.5r 12UR177   568  C~1CL9      
2011 12  01.42393  01 32 44.413  +27 17 59.42  24.5r 12UR177   568  C~1CL9      
2012 08  21.50331  01 45 29.520  +28 14 17.18        12UR177   568  C~1CL9      
2012 08  23.60417  01 45 25.283  +28 14 38.63  24.5r 12UR177   568  C~1CL9      
2012 08  24.41397  01 45 23.580  +28 14 46.38        12UR177   568  C~1CL9      
2012 08  24.46174  01 45 23.464  +28 14 46.61        12UR177   568  C~1CL9      
2012 08  28.50703  01 45 14.007  +28 15 18.15        12UR177   568  C~1CL9      
2012 09  12.48289  01 44 28.295  +28 15 46.06        12UR177   568  C~1CL9      
2012 09  14.45580  01 44 21.130  +28 15 39.28  24.2r 12UR177   568  C~1CL9      
2012 10  19.39438  01 41 46.307  +28 07 15.80  23.9r 12UR177   568  C~1CL9      
2012 10  19.40301  01 41 46.257  +28 07 15.78        12UR177   568  C~1CL9      
2012 10  20.38644  01 41 41.509  +28 06 52.03  24.2r 12UR177   568  C~1CL9      
2012 10  21.39663  01 41 36.631  +28 06 27.45  24.1r 12UR177   568  C~1CL9      
2012 10  21.43518  01 41 36.446  +28 06 26.57  24.1r 12UR177   568  C~1CL9      
2012 10  21.47359  01 41 36.255  +28 06 25.61  24.4r 12UR177   568  C~1CL9      
2012 11  14.38458  01 39 45.455  +27 54 53.28  24.4r 12UR177   568  C~1CL9      
2012 11  16.30609  01 39 37.354  +27 53 50.94  24.3r 12UR177   568  C~1CL9      
2013 01  14.25495  01 37 40.600  +27 24 13.59  24.5r 12UR177   568  C~1CL9      
2013 01  14.26012  01 37 40.606  +27 24 13.38  24.3r 12UR177   568  C~1CL9      
2013 01  14.29462  01 37 40.633  +27 24 12.46  24.3r 12UR177   568  C~1CL9      
2013 02  03.31560  01 38 15.070  +27 18 57.57  24.2r 12UR177   568  C~1CL9      
2013 02  09.28310  01 38 32.721  +27 18 08.41  24.4r 12UR177   568  C~1CL9      
2013 02  09.28815  01 38 32.737  +27 18 08.39  24.5r 12UR177   568  C~1CL9      
2013 02  14.22894  01 38 49.752  +27 17 44.62  24.3r 12UR177   568  C~1CL9      
2017 12  20.11515  02 09 44.653  +29 44 51.86  23.6R 12UR177   G37  C~2Uwm      
2017 12  20.18599  02 09 44.465  +29 44 49.50        12UR177   G37  C~2Uwm      

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     0.19       0.00     0.19
  2   0.0001      0.00     0.02       0.00    -0.17
  3   0.0110      0.00    -0.11       0.00    -0.10
  4   0.2492      0.00    -0.01       0.00    -0.11
  5   0.9722      0.00    -0.06       0.00    -0.18
  6   0.9779      0.00    -0.05       0.00    -0.11
  7   0.9801      0.00     0.12       0.00     0.16
  8   0.9803      0.00    -0.02       0.00    -0.06
  9   0.9913      0.00    -0.06       0.00     0.01
 10   1.0323      0.00    -0.04       0.00     0.03
 11   1.0377      0.00    -0.10       0.00     0.09
 12   1.1334      0.00    -0.07       0.00     0.02
 13   1.1334      0.00    -0.19       0.00     0.20
 14   1.1361      0.00    -0.12       0.00     0.02
 15   1.1389      0.00    -0.03       0.00     0.10
 16   1.1390      0.00     0.04       0.00     0.17
 17   1.1391      0.00     0.01       0.00     0.16
 18   1.2046      0.00     0.01       0.00    -0.02
 19   1.2098      0.00     0.02       0.00    -0.09
 20   1.3712      0.00     0.06       0.00     0.12
 21   1.3712      0.00     0.10       0.00     0.02
 22   1.3713      0.00     0.16       0.00    -0.16
 23   1.4261      0.00    -0.12       0.00     0.07
 24   1.4425      0.00     0.03       0.00    -0.18
 25   1.4425      0.00     0.03       0.00    -0.17
 26   1.4560      0.00     0.06       0.00    -0.12
 27   6.3017      0.00    -0.00       0.00     0.02
 28   6.3019      0.00     0.03       0.00    -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.

12UR177    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        74.957    74.957    74.958
ecceobj         0.497     0.497     0.497
incobj         16.351    16.351    16.351
qmin           36.154    36.010    36.079
qmax          113.354   113.677   113.353
amean          73.693    73.777    73.710
amin           72.672    72.672    72.621
amax           75.167    75.251    75.126
emean           0.493     0.495     0.495
emin            0.478     0.482     0.481
emax            0.509     0.512     0.509
imean          17.452    17.313    17.288
imin           16.682    16.393    16.493
imax           18.231    18.171    18.172
excite_mean     0.578     0.578     0.578
fracstop        1.000     1.000     1.000
cjmean          3.004     3.004     3.003

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       177.8     182.6     177.1
kozaiamp        179.9     180.0     180.0