Orbit Fit and Astrometric record for 12UK177

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: 12UK177   
# Created Thu Dec  9 02:11:23 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     27 observations of     27
# Arc:   8.15y
# First observation: 2011/09/01
#  Last observation: 2019/10/26
# Chi-squared of fit:     8.44 DOF:     48 RMS:  0.10
# Min/Max residuals:    -0.27    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.867406E-05  3.390428E-02 -5.709373E-06 -1.151776E-02  2.762383E-02 -5.560858E-03
# Covariance matrix:
  2.2387E-13 -1.5572E-13 -3.4036E-14  4.8900E-14  4.7477E-14 -4.7978E-13
 -1.5572E-13  2.7015E-13  6.5198E-14 -9.1917E-14  7.9955E-14  8.8798E-13
 -3.4036E-14  6.5198E-14  9.5951E-14 -4.0956E-14  2.1229E-14  2.2421E-13
  4.8900E-14 -9.1917E-14 -4.0956E-14  4.4729E-14 -2.8759E-14 -3.1616E-13
  4.7477E-14  7.9955E-14  2.1229E-14 -2.8759E-14  1.3996E-13  2.6842E-13
 -4.7978E-13  8.8798E-13  2.2421E-13 -3.1616E-13  2.6842E-13  3.0548E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   17.188350   31.779081    0.807902    0.177196   -0.572969  2455805.923946
# Heliocentric elements and errors
Epoch:              2455806.5000  =  2011/09/02
Mean Anomaly:          355.17894 +/-     0.002
Argument of Peri:      162.09884 +/-     0.007
Long of Asc Node:      251.53153 +/-     0.000
Inclination:            24.82729 +/-     0.000
Eccentricity:         0.62383262 +/-    0.0001
Semi-Major Axis:     94.00912293 +/-    0.0155
Time of Perihelion: 2460265.0453 +/-      81.1
Perihelion:          35.36316514 +/-    0.0079
Aphelion:           152.65508073 +/-    0.0257
Period (y)              911.5137 +/-      0.22
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.33791983 +/-    0.0004
Ecliptic Y           17.84382304 +/-    0.0002
Ecliptic Z           10.69761931 +/-    0.0001
Ecliptic XDOT        -0.00193370 +/-    0.0000
Ecliptic YDOT         0.00276231 +/-    0.0000
Ecliptic ZDOT        -0.00125337 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.78640987 +/-    0.0004
Geocenter to KBO     36.20076930 +/-    0.0005
# Hcoef:  8.71

The following table shows the complete astrometric record for 12UK177. 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 (12UK177) followed by the observatory code and reference code for the source of the astrometry.

2011 09  01.42318  01 31 50.459  +28 06 58.05  24.3r 12UK177   568  C~1C6U      
2011 09  01.46869  01 31 50.273  +28 06 58.00  24.0r 12UK177   568  C~1C6U      
2011 09  01.51133  01 31 50.148  +28 06 58.23  24.5r 12UK177   568  C~1C6U      
2011 09  05.45125  01 31 36.616  +28 06 50.57  24.3r 12UK177   568  C~1C6U      
2011 11  24.35514  01 25 08.760  +27 27 13.47  24.4r 12UK177   568  C~1C6U      
2011 11  30.31101  01 24 47.032  +27 22 41.02  24.5r 12UK177   568  C~1C6U      
2011 12  01.35919  01 24 43.521  +27 21 53.14  24.3r 12UK177   568  C~1C6U      
2012 01  28.23315  01 24 33.037  +26 47 34.92  24.6r 12UK177   568  C~1C6U      
2012 08  18.50920  01 41 44.241  +28 12 48.53  24.3r 12UK177   568  C~1C6U      
2012 08  18.54805  01 41 44.161  +28 12 48.88  24.4r 12UK177   568  C~1C6U      
2012 08  28.50703  01 41 21.374  +28 13 57.14  24.7r 12UK177   568  C~1C6U      
2012 09  12.40702  01 40 30.283  +28 13 18.36  24.1r 12UK177   568  C~1C6U      
2012 09  14.44299  01 40 21.913  +28 12 59.73  24.1r 12UK177   568  C~1C6U      
2012 10  19.38154  01 37 25.634  +27 59 52.70  24.1r 12UK177   568  C~1C6U      
2012 10  19.42436  01 37 25.395  +27 59 51.26  24.0r 12UK177   568  C~1C6U      
2012 10  20.37365  01 37 20.194  +27 59 18.75  24.2r 12UK177   568  C~1C6U      
2012 10  20.41255  01 37 19.968  +27 59 17.40        12UK177   568  C~1C6U      
2012 10  20.45104  01 37 19.759  +27 59 16.16  24.0r 12UK177   568  C~1C6U      
2012 10  21.46079  01 37 14.224  +27 58 41.09  24.6r 12UK177   568  C~1C6U      
2012 11  14.37175  01 35 09.717  +27 42 42.95  24.4r 12UK177   568  C~1C6U      
2013 01  14.26447  01 33 07.625  +27 01 21.27  24.3r 12UK177   568  C~1C6U      
2013 01  14.27309  01 33 07.637  +27 01 21.01  24.5r 12UK177   568  C~1C6U      
2013 02  06.23610  01 34 09.581  +26 53 12.28  24.8r 12UK177   568  C~1C6U      
2013 02  06.24917  01 34 09.634  +26 53 12.06  24.2r 12UK177   568  C~1C6U      
2013 02  14.23326  01 34 44.798  +26 51 51.62        12UK177   568  C~1C6U      
2019 10  26.421470 02 45 23.563  +27 42 51.33  24.1G 12UK177   G37  C~3cjl      
2019 10  26.506510 02 45 23.077  +27 42 48.91        12UK177   G37  C~3cjl      

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    -0.11
     2   0.0001      0.00    -0.27       0.00    -0.16
     3   0.0002      0.00     0.01       0.00     0.07
     4   0.0110      0.00     0.03       0.00    -0.02
     5   0.2298      0.00    -0.02       0.00    -0.04
     6   0.2461      0.00    -0.05       0.00    -0.05
     7   0.2490      0.00    -0.01       0.00    -0.10
     8   0.4074      0.00     0.14       0.00     0.02
     9   0.9640      0.00     0.17       0.00     0.03
    10   0.9641      0.00     0.07       0.00    -0.04
    11   0.9913      0.00     0.00       0.00     0.12
    12   1.0321      0.00    -0.08       0.00     0.09
    13   1.0377      0.00     0.06       0.00     0.03
    14   1.1334      0.00    -0.15       0.00     0.08
    15   1.1335      0.00    -0.14       0.00     0.09
    16   1.1361      0.00    -0.11       0.00     0.00
    17   1.1362      0.00    -0.23       0.00    -0.01
    18   1.1363      0.00    -0.14       0.00     0.08
    19   1.1390      0.00    -0.09       0.00     0.06
    20   1.2045      0.00     0.01       0.00     0.06
    21   1.3712      0.00     0.03       0.00    -0.01
    22   1.3713      0.00     0.05       0.00    -0.02
    23   1.4341      0.00     0.13       0.00    -0.06
    24   1.4342      0.00     0.16       0.00    -0.11
    25   1.4560      0.00     0.05       0.00    -0.05
    26   8.1506      0.00    -0.00       0.00    -0.01
    27   8.1508      0.00     0.01       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.

12UK177    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        94.452    94.451    94.453
ecceobj         0.625     0.625     0.625
incobj         24.825    24.825    24.825
qmin           33.000    33.917    33.181
qmax          156.686   155.430   154.685
amean          92.658    92.672    90.874
amin           90.295    91.013    88.912
amax           95.557    95.165    95.134
emean           0.623     0.622     0.616
emin            0.604     0.609     0.597
emax            0.643     0.634     0.636
imean          25.507    25.697    25.557
imin           23.989    25.111    24.097
imax           26.753    26.617    26.769
excite_mean     0.758     0.758     0.752
fracstop        1.000     1.000     1.000
cjmean          2.800     2.800     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       229.8     246.5     221.4
kozaiamp        180.0      78.1     180.0