Orbit Fit and Astrometric record for 491768

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: 491768    
# Created Wed Oct 18 01:36:54 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   67 observations of   67
# Arc:   4.21y
# First observation: 2012/11/15
#  Last observation: 2017/01/29
# Chi-squared of fit:    65.31 DOF:  128 RMS:  0.17
# Min/Max residuals:    -0.30    1.12
# Exact a, adot, b, bdot, g, gdot:
  1.709817E-05  2.585240E-02  7.792940E-07  9.861055E-04  2.498261E-02 -9.729813E-04
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
  -15.857888   34.198161   -0.316904   -0.255135   -0.898478  2456246.601970
# Heliocentric elements and errors
Epoch:              2456246.5000  =  2012/11/15
Mean Anomaly:          347.12333 +/-     0.000
Argument of Peri:      294.73413 +/-     0.000
Long of Asc Node:      116.12021 +/-     0.000
Inclination:            15.66447 +/-     0.000
Eccentricity:         0.12135153 +/-    0.0000
Semi-Major Axis:     46.37616477 +/-    0.0000
Time of Perihelion: 2460372.6185 +/-       0.0
Perihelion:          40.74834641 +/-    0.0000
Aphelion:            52.00398313 +/-    0.0000
Period (y)              315.8279 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.44258537 +/-    0.0000
Ecliptic Y           22.43172937 +/-    0.0000
Ecliptic Z          -10.93771825 +/-    0.0000
Ecliptic XDOT        -0.00165889 +/-    0.0000
Ecliptic YDOT         0.00230408 +/-    0.0000
Ecliptic ZDOT         0.00013322 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.93090719 +/-    0.0000
Geocenter to KBO     40.02790624 +/-    0.0000
# Hcoef:  7.85

The following table shows the complete astrometric record for 491768. 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 (491768) followed by the observatory code and reference code for the source of the astrometry.

2012 11  15.101192 02 28 57.16   -02 02 32.7         491768    W84  C~1Cs0      
2012 11  15.103958 02 28 57.16   -02 02 32.7         491768    W84  C~1Cs0      
2012 11  15.117720 02 28 57.11   -02 02 32.9         491768    W84  C~1Cs0      
2012 12  08.193102 02 27 21.03   -02 05 35.4         491768    W84  C~1Cs0      
2012 12  08.198611 02 27 21.02   -02 05 35.7         491768    W84  C~1Cs0      
2014 09  27.285926 02 43 39.82   -00 37 04.1   23.7i 491768    W84  C~1Cs0      
2014 09  27.289722 02 43 39.79   -00 37 04.0   22.6z 491768    W84  C~1Cs0      
2014 10  13.207384 02 42 37.25   -00 44 51.7   23.2i 491768    W84  C~1Cs0      
2014 10  13.211181 02 42 37.24   -00 44 52.0   23.4z 491768    W84  C~1Cs0      
2014 10  22.120961 02 41 57.42   -00 48 52.7   23.9r 491768    W84  C~1Cs0      
2014 10  22.127118 02 41 57.37   -00 48 52.9   23.2z 491768    W84  C~1Cs0      
2014 10  29.103333 02 41 24.71   -00 51 44.9   23.1r 491768    W84  C~1Cs0      
2014 10  29.105694 02 41 24.71   -00 51 44.9   23.0i 491768    W84  C~1Cs0      
2014 10  29.109491 02 41 24.68   -00 51 45.0   23.4z 491768    W84  C~1Cs0      
2014 11  03.218530 02 41 00.35   -00 53 39.2   23.2r 491768    W84  C~1Cs0      
2014 11  03.220891 02 41 00.34   -00 53 39.2   23.6i 491768    W84  C~1Cs0      
2014 11  03.224688 02 41 00.32   -00 53 39.4   22.7z 491768    W84  C~1Cs0      
2015 08  15.391546 02 50 25.30   +00 14 59.2   23.3r 491768    W84  C~1h5g      
2015 08  15.393899 02 50 25.30   +00 14 59.3   23.6i 491768    W84  C~1h5g      
2015 08  15.397870 02 50 25.32   +00 14 59.3   23.2z 491768    W84  C~1h5g      
2015 08  19.406308 02 50 25.20   +00 13 29.5   23.5i 491768    W84  C~1h5g      
2015 08  19.410104 02 50 25.22   +00 13 29.5   23.3z 491768    W84  C~1h5g      
2015 08  19.410278 02 50 25.22   +00 13 29.5   23.4z 491768    W84  C~1h5g      
2015 08  24.361215 02 50 23.08   +00 11 31.1   23.5r 491768    W84  C~1h5g      
2015 08  24.363588 02 50 23.09   +00 11 30.9   23.1i 491768    W84  C~1h5g      
2015 08  24.367593 02 50 23.07   +00 11 30.9   22.8z 491768    W84  C~1h5g      
2015 09  04.264988 02 50 10.62   +00 06 45.4   23.2z 491768    W84  C~1h5g      
2015 11  03.174259 02 46 34.31   -00 20 53.8   23.3i 491768    W84  C~1h5g      
2015 11  03.178229 02 46 34.27   -00 20 53.6   23.5z 491768    W84  C~1h5g      
2015 11  29.215532 02 44 32.74   -00 27 32.2   23.5i 491768    W84  C~1h5g      
2015 11  29.219502 02 44 32.71   -00 27 32.2   23.1z 491768    W84  C~1h5g      
2015 12  09.108455 02 43 52.02   -00 28 25.0   24.8g 491768    W84  C~1h5g      
2015 12  09.110671 02 43 52.02   -00 28 24.9   24.2r 491768    W84  C~1h5g      
2015 12  09.113032 02 43 52.01   -00 28 24.9   23.4i 491768    W84  C~1h5g      
2015 12  29.067500 02 42 48.09   -00 27 06.9   23.7r 491768    W84  C~1h5g      
2015 12  29.069873 02 42 48.08   -00 27 06.8   23.5i 491768    W84  C~1h5g      
2015 12  29.073843 02 42 48.07   -00 27 06.7   23.1z 491768    W84  C~1h5g      
2016 09  29.206910 02 54 33.95   +00 26 49.3   24.0r 491768    W84  C~2AzG      
2016 09  29.209271 02 54 33.93   +00 26 49.4   23.5i 491768    W84  C~2AzG      
2016 09  29.215868 02 54 33.92   +00 26 49.0   23.3z 491768    W84  C~2AzG      
2016 10  10.173299 02 53 52.10   +00 21 34.0   23.6r 491768    W84  C~2AzG      
2016 11  03.109132 02 52 03.55   +00 11 31.6   23.4r 491768    W84  C~2AzG      
2016 11  03.111493 02 52 03.55   +00 11 31.6   23.3i 491768    W84  C~2AzG      
2016 11  10.109769 02 51 29.85   +00 09 13.2   22.7i 491768    W84  C~2AzG      
2016 11  10.116400 02 51 29.84   +00 09 13.2   22.8z 491768    W84  C~2AzG      
2016 11  17.189757 02 50 56.03   +00 07 15.9   23.0z 491768    W84  C~2AzG      
2016 11  18.051065 02 50 51.97   +00 07 03.3   24.2g 491768    W84  C~2AzG      
2016 11  18.053785 02 50 51.97   +00 07 03.1   23.4r 491768    W84  C~2AzG      
2016 11  18.056146 02 50 51.96   +00 07 03.0   23.1i 491768    W84  C~2AzG      
2016 11  18.062766 02 50 51.94   +00 07 03.0   22.9z 491768    W84  C~2AzG      
2016 11  25.044734 02 50 19.62   +00 05 35.4   23.7r 491768    W84  C~2AzG      
2016 11  25.047083 02 50 19.61   +00 05 35.5   23.2i 491768    W84  C~2AzG      
2016 11  25.051065 02 50 19.59   +00 05 35.5   22.8z 491768    W84  C~2AzG      
2016 12  03.149514 02 49 44.08   +00 04 27.9   23.2r 491768    W84  C~2AzG      
2016 12  03.151863 02 49 44.08   +00 04 27.9   23.2i 491768    W84  C~2AzG      
2016 12  03.158472 02 49 44.06   +00 04 27.8   22.9z 491768    W84  C~2AzG      
2016 12  17.090775 02 48 50.59   +00 04 03.7   23.6r 491768    W84  C~2AzG      
2016 12  17.093137 02 48 50.59   +00 04 03.7   23.1i 491768    W84  C~2AzG      
2016 12  17.097106 02 48 50.56   +00 04 03.7   23.1z 491768    W84  C~2AzG      
2016 12  24.057326 02 48 28.46   +00 04 36.5   24.6g 491768    W84  C~2AzG      
2016 12  24.060023 02 48 28.46   +00 04 36.4   23.6r 491768    W84  C~2AzG      
2016 12  24.062384 02 48 28.45   +00 04 36.4   23.2i 491768    W84  C~2AzG      
2016 12  24.068993 02 48 28.44   +00 04 36.4   23.1z 491768    W84  C~2AzG      
2016 12  28.140579 02 48 17.17   +00 05 09.3   23.6r 491768    W84  C~2AzG      
2016 12  28.149549 02 48 17.17   +00 05 09.5   23.2z 491768    W84  C~2AzG      
2017 01  29.072743 02 47 39.53   +00 15 00.2   23.3i 491768    W84  C~2AzG      
2017 01  29.079375 02 47 39.54   +00 15 00.6   23.0z 491768    W84  C~2AzG      

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     0.01       0.00     1.12
  2   0.0000      0.00     0.12       0.00    -0.03
  3   0.0000      0.00     0.33       0.00    -0.02
  4   0.0632      0.00    -0.12       0.00     0.31
  5   0.0632      0.00     0.03       0.00     0.01
  6   1.8650      0.00     0.06       0.00     0.04
  7   1.8650      0.00    -0.19       0.00     0.26
  8   1.9086      0.00     0.10       0.00     0.18
  9   1.9086      0.00     0.20       0.00    -0.02
 10   1.9330      0.00     0.27       0.00     0.11
 11   1.9330      0.00    -0.05       0.00     0.07
 12   1.9521      0.00    -0.14       0.00    -0.18
 13   1.9521      0.00     0.03       0.00    -0.13
 14   1.9521      0.00    -0.15       0.00    -0.14
 15   1.9661      0.00     0.03       0.00    -0.16
 16   1.9661      0.00     0.05       0.00    -0.11
 17   1.9661      0.00     0.03       0.00    -0.23
 18   2.7469      0.00     0.13       0.00    -0.22
 19   2.7469      0.00     0.13       0.00    -0.07
 20   2.7469      0.00     0.42       0.00     0.02
 21   2.7579      0.00    -0.26       0.00    -0.08
 22   2.7579      0.00     0.06       0.00     0.01
 23   2.7579      0.00     0.06       0.00     0.02
 24   2.7714      0.00    -0.04       0.00     0.04
 25   2.7714      0.00     0.14       0.00    -0.11
 26   2.7714      0.00    -0.12       0.00    -0.01
 27   2.8013      0.00     0.08       0.00     0.08
 28   2.9653      0.00     0.33       0.00     0.12
 29   2.9653      0.00     0.02       0.00     0.41
 30   3.0366      0.00     0.08       0.00    -0.07
 31   3.0366      0.00    -0.11       0.00    -0.04
 32   3.0637      0.00    -0.15       0.00     0.05
 33   3.0637      0.00    -0.02       0.00     0.15
 34   3.0637      0.00    -0.03       0.00     0.16
 35   3.1183      0.00     0.16       0.00     0.04
 36   3.1183      0.00     0.10       0.00     0.12
 37   3.1183      0.00     0.10       0.00     0.18
 38   3.8716      0.00    -0.02       0.00     0.09
 39   3.8716      0.00    -0.19       0.00     0.26
 40   3.8716      0.00     0.01       0.00     0.06
 41   3.9016      0.00    -0.21       0.00     0.13
 42   3.9672      0.00     0.02       0.00    -0.10
 43   3.9672      0.00     0.20       0.00    -0.05
 44   3.9863      0.00    -0.03       0.00     0.10
 45   3.9864      0.00     0.31       0.00     0.22
 46   4.0057      0.00    -0.12       0.00     0.10
 47   4.0081      0.00    -0.21       0.00     0.08
 48   4.0081      0.00    -0.01       0.00    -0.08
 49   4.0081      0.00     0.01       0.00    -0.14
 50   4.0081      0.00     0.18       0.00    -0.05
 51   4.0272      0.00     0.19       0.00    -0.11
 52   4.0272      0.00     0.20       0.00     0.02
 53   4.0272      0.00     0.17       0.00     0.06
 54   4.0494      0.00     0.04       0.00    -0.12
 55   4.0494      0.00     0.19       0.00    -0.10
 56   4.0494      0.00     0.32       0.00    -0.16
 57   4.0876      0.00     0.23       0.00    -0.01
 58   4.0876      0.00     0.35       0.00    -0.02
 59   4.0876      0.00     0.11       0.00    -0.03
 60   4.1067      0.00    -0.08       0.00     0.20
 61   4.1067      0.00     0.04       0.00     0.08
 62   4.1067      0.00    -0.00       0.00     0.06
 63   4.1067      0.00     0.15       0.00     0.02
 64   4.1178      0.00    -0.18       0.00    -0.05
 65   4.1179      0.00     0.17       0.00     0.06
 66   4.2053      0.00    -0.29       0.00    -0.30
 67   4.2053      0.00    -0.17       0.00    -0.08

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.

491768    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        46.538    46.538    46.538
ecceobj         0.124     0.124     0.124
incobj         15.667    15.667    15.667
qmin           40.079    40.070    40.078
qmax           52.508    52.489    52.504
amean          46.140    46.140    46.140
amin           45.760    45.752    45.763
amax           46.555    46.558    46.557
emean           0.117     0.117     0.116
emin            0.105     0.105     0.106
emax            0.128     0.128     0.128
imean          14.163    14.163    14.162
imin           13.803    13.801    13.804
imax           14.521    14.523    14.519
excite_mean     0.271     0.271     0.271
fracstop        1.000     1.000     1.000
cjmean          3.037     3.037     3.037

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       176.4     176.6     176.6
kozaiamp        180.0     180.0     180.0