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 Mon Dec 11 02:37:55 2017
# Orbit generated from Bernstein formalism
# Fitting   26 observations of   26
# Arc:   1.46y
# First observation: 2011/09/01
#  Last observation: 2013/02/14
Preliminary a, adot, b, bdot, g, gdot:
  -0.000006   0.024486  -0.000022  -0.001316   0.022953   0.000000
# Chi-squared of fit:     8.94 DOF:   46 RMS:  0.10
# Min/Max residuals:    -0.20    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.566418E-05  2.428165E-02 -1.548081E-06 -1.352373E-03  2.281858E-02 -7.546040E-03
# Covariance matrix:
  4.7173E-13  5.0155E-14  1.7254E-14 -5.9187E-14  4.0710E-13  2.0299E-11
  5.0155E-14  1.8362E-12  4.1522E-14 -1.9130E-13  1.7502E-12  7.4036E-11
  1.7254E-14  4.1522E-14  3.6385E-13 -3.1024E-13  4.9128E-14  2.8560E-12
 -5.9187E-14 -1.9130E-13 -3.1024E-13  3.2895E-13 -2.2137E-13 -1.0916E-11
  4.0710E-13  1.7502E-12  4.9128E-14 -2.2137E-13  1.9925E-12  8.5037E-11
  2.0299E-11  7.4036E-11  2.8560E-12 -1.0916E-11  8.5037E-11  3.9369E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   16.301812   33.196334    0.822534    0.162632   -0.556228  2455805.919486
# Heliocentric elements and errors
Epoch:              2455800.5000  =  2011/08/27
Mean Anomaly:          341.18342 +/-     0.108
Argument of Peri:      157.50306 +/-     0.210
Long of Asc Node:      291.52233 +/-     0.005
Inclination:            16.35054 +/-     0.000
Eccentricity:         0.49643525 +/-    0.0028
Semi-Major Axis:     74.68589850 +/-    0.2770
Time of Perihelion: 2468122.8779 +/-      16.4
Perihelion:          37.60918586 +/-    0.2502
Aphelion:           111.76261115 +/-    0.4636
Period (y)              645.4552 +/-      3.59
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.13612585 +/-    0.0022
Ecliptic Y           22.65968486 +/-    0.0014
Ecliptic Z           12.30121739 +/-    0.0008
Ecliptic XDOT        -0.00228735 +/-    0.0000
Ecliptic YDOT         0.00199247 +/-    0.0000
Ecliptic ZDOT        -0.00040982 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.39145029 +/-    0.0019
Geocenter to KBO     43.82394438 +/-    0.0027
# Hcoef:  7.98

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      

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     0.24       0.00     0.13
  2   0.0001     -1.84    -0.03       0.55    -0.15
  3   0.0110   -144.53    -0.12      68.33    -0.04
  4   0.2492  -5358.86    -0.06     222.61    -0.08
  5   0.9722   5322.68    -0.11    -468.05    -0.14
  6   0.9779   5278.32    -0.07    -427.67    -0.09
  7   0.9801   5260.17     0.16    -412.25     0.11
  8   0.9803   5258.83    -0.04    -411.48    -0.05
  9   0.9913   5153.88    -0.04    -336.55     0.03
 10   1.0323   4601.54    -0.02     -89.88     0.04
 11   1.0377   4510.93    -0.05     -61.52     0.11
 12   1.1334   2422.03    -0.05     225.20     0.04
 13   1.1334   2421.41    -0.07     225.43     0.24
 14   1.1361   2354.26    -0.09     226.69     0.06
 15   1.1389   2285.20     0.01     227.84     0.10
 16   1.1390   2282.60     0.10     227.93     0.14
 17   1.1391   2279.90     0.07     227.98     0.14
 18   1.2046    660.13     0.01     133.34    -0.02
 19   1.2098    537.20    -0.01     115.84    -0.09
 20   1.3712  -1569.83     0.10    -945.36     0.09
 21   1.3712  -1569.84     0.10    -945.58    -0.01
 22   1.3713  -1569.85     0.08    -946.57    -0.20
 23   1.4261  -1264.32    -0.07   -1411.66     0.10
 24   1.4425  -1065.03    -0.04   -1546.00    -0.18
 25   1.4425  -1064.84    -0.03   -1546.10    -0.17
 26   1.4560   -863.73     0.01   -1653.63    -0.14

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        74.979    75.768    74.223
ecceobj         0.498     0.505     0.490
incobj         16.351    16.352    16.351
qmin           36.074    35.872    36.362
qmax          112.856   114.956   111.891
amean          73.528    74.328    73.143
amin           72.459    73.197    72.203
amax           75.099    75.872    74.559
emean           0.493     0.501     0.487
emin            0.478     0.488     0.473
emax            0.508     0.517     0.503
imean          17.423    17.438    17.526
imin           16.643    16.576    16.770
imax           18.254    18.292    18.318
excite_mean     0.577     0.584     0.573
fracstop        1.000     1.000     1.000
cjmean          3.003     2.999     3.007

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       180.7     180.3     180.0
kozaiamp        180.0     180.0     180.0