Orbit Fit and Astrometric record for 491767

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: 491767    
# Created Fri Dec  3 02:07:33 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     57 observations of     57
# Arc:   8.97y
# First observation: 2009/01/16
#  Last observation: 2018/01/05
# Chi-squared of fit:    63.81 DOF:    108 RMS:  0.19
# Min/Max residuals:    -0.48    0.43
# Exact a, adot, b, bdot, g, gdot:
  1.520303E-05  2.725422E-02  8.497217E-06  1.169860E-02  2.745362E-02 -5.662273E-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
  -19.097216   27.281345   -0.988457   -0.007011   -0.020351  2454847.672724
# Heliocentric elements and errors
Epoch:              2454848.5000  =  2009/01/17
Mean Anomaly:            5.19317 +/-     0.000
Argument of Peri:      313.29665 +/-     0.000
Long of Asc Node:       65.46447 +/-     0.000
Inclination:            30.14860 +/-     0.000
Eccentricity:         0.07926860 +/-    0.0000
Semi-Major Axis:     39.58096576 +/-    0.0000
Time of Perihelion: 2453536.4267 +/-       0.0
Perihelion:          36.44343800 +/-    0.0000
Aphelion:            42.71849352 +/-    0.0000
Period (y)              249.0220 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.15980444 +/-    0.0000
Ecliptic Y           16.66138649 +/-    0.0000
Ecliptic Z          -11.91697353 +/-    0.0000
Ecliptic XDOT        -0.00094851 +/-    0.0000
Ecliptic YDOT         0.00256919 +/-    0.0000
Ecliptic ZDOT         0.00112082 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.45859993 +/-    0.0000
Geocenter to KBO     36.42511172 +/-    0.0000
# Hcoef:  7.67

The following table shows the complete astrometric record for 491767. 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 (491767) followed by the observatory code and reference code for the source of the astrometry.

2009 01  16.171958 02 08 32.17   -07 20 50.3         491767    645  C~1QeJ      
2009 01  16.172787 02 08 32.17   -07 20 50.3         491767    645  C~1QeJ      
2009 01  16.175275 02 08 32.17   -07 20 50.2         491767    645  C~1QeJ      
2012 11  15.091134 02 31 40.89   -02 47 13.3         491767    W84  C~1Cs0      
2012 11  15.092535 02 31 40.89   -02 47 13.3         491767    W84  C~1Cs0      
2012 11  15.095370 02 31 40.87   -02 47 13.4         491767    W84  C~1Cs0      
2012 11  15.101192 02 31 40.84   -02 47 13.4         491767    W84  C~1Cs0      
2012 12  04.202569 02 30 04.75   -02 48 24.7         491767    W84  C~1Cs0      
2012 12  04.203935 02 30 04.75   -02 48 24.7         491767    W84  C~1Cs0      
2013 08  30.265162 02 42 18.45   -01 03 06.3   23.8r 491767    W84  C~1Cs0      
2013 08  30.288738 02 42 18.42   -01 03 06.8   22.9i 491767    W84  C~1Cs0      
2013 08  30.292546 02 42 18.40   -01 03 06.9   23.1z 491767    W84  C~1Cs0      
2013 09  08.296649 02 41 58.45   -01 07 06.3   24.3g 491767    W84  C~1Cs0      
2013 09  08.298877 02 41 58.44   -01 07 06.1   23.2r 491767    W84  C~1Cs0      
2013 09  08.301238 02 41 58.45   -01 07 05.9   23.3i 491767    W84  C~1Cs0      
2013 09  08.305035 02 41 58.41   -01 07 05.9   23.0z 491767    W84  C~1Cs0      
2013 09  10.38792  02 41 52.737  -01 08 03.78  24.0g 491767    W84  C~5204      
2013 11  13.15868  02 36 50.045  -01 33 33.30  22.1z 491767    W84  C~5204      
2013 12  28.13376  02 33 31.510  -01 31 29.25  24.8g 491767    W84  C~5204      
2013 12  28.13513  02 33 31.520  -01 31 29.17  23.3r 491767    W84  C~5204      
2014 08  19.39449  02 47 23.137  +00 13 16.99  23.2z 491767    W84  C~5204      
2014 09  03.397772 02 47 03.65   +00 07 38.3   24.3g 491767    W84  C~1Cs0      
2014 09  03.406146 02 47 03.63   +00 07 38.2   23.4z 491767    W84  C~1Cs0      
2014 09  30.28820  02 45 36.696  -00 04 19.11  23.5g 491767    W84  C~5204      
2014 10  02.220718 02 45 28.25   -00 05 11.1   23.2r 491767    W84  C~1Cs0      
2014 10  02.223067 02 45 28.23   -00 05 11.1   23.3i 491767    W84  C~1Cs0      
2014 10  02.226875 02 45 28.20   -00 05 11.1   22.7z 491767    W84  C~1Cs0      
2014 10  22.120961 02 43 49.67   -00 13 34.2   23.3r 491767    W84  C~1Cs0      
2014 10  22.123310 02 43 49.67   -00 13 34.5   23.1i 491767    W84  C~1Cs0      
2014 10  22.127118 02 43 49.64   -00 13 34.5   22.9z 491767    W84  C~1Cs0      
2014 10  27.109352 02 43 22.54   -00 15 23.5   23.9i 491767    W84  C~1Cs0      
2014 10  27.113148 02 43 22.54   -00 15 23.5   22.9z 491767    W84  C~1Cs0      
2014 10  29.103333 02 43 11.57   -00 16 04.6   23.3r 491767    W84  C~1Cs0      
2014 10  29.105694 02 43 11.54   -00 16 04.6   22.6i 491767    W84  C~1Cs0      
2014 10  29.109491 02 43 11.52   -00 16 04.8   22.8z 491767    W84  C~1Cs0      
2014 11  03.218530 02 42 43.15   -00 17 42.2   22.7r 491767    W84  C~1Cs0      
2014 11  03.220891 02 42 43.14   -00 17 42.2   22.8i 491767    W84  C~1Cs0      
2015 12  15.16097  02 44 04.722  +00 50 41.42  22.9i 491767    W84  C~5204      
2016 09  23.29149  02 55 50.934  +02 23 58.33  22.8z 491767    W84  C~5204      
2016 09  23.292847 02 55 50.92   +02 23 58.2   23.2i 491767    W84  C~2CgH      
2016 09  23.29285  02 55 50.932  +02 23 58.11  23.2i 491767    W84  C~5204      
2016 09  24.298345 02 55 47.20   +02 23 33.5   23.4r 491767    W84  C~2CgH      
2016 09  24.29835  02 55 47.206  +02 23 33.38  23.3r 491767    W84  C~5204      
2016 09  25.27517  02 55 43.543  +02 23 09.08  24.1g 491767    W84  C~5204      
2016 10  26.224769 02 53 15.94   +02 10 57.3   23.5r 491767    W84  C~2CgH      
2016 10  26.22477  02 53 15.951  +02 10 57.20  23.3r 491767    W84  C~5204      
2016 11  19.17772  02 51 02.763  +02 04 34.53  23.1z 491767    W84  C~5204      
2016 11  19.179097 02 51 02.76   +02 04 34.6   22.9i 491767    W84  C~2CgH      
2016 11  19.17910  02 51 02.769  +02 04 34.45  22.6i 491767    W84  C~5204      
2016 12  21.130243 02 48 31.16   +02 04 00.5   23.6r 491767    W84  C~2CgH      
2016 12  21.13025  02 48 31.171  +02 04 00.26  23.4r 491767    W84  C~5204      
2017 10  26.29745  02 58 12.155  +03 23 52.27  23.0g 491767    W84  C~5204      
2017 11  01.19798  02 57 39.679  +03 21 57.98  23.6z 491767    W84  C~5204      
2017 12  10.10738  02 54 11.428  +03 15 33.30  22.8r 491767    W84  C~5204      
2017 12  10.10875  02 54 11.427  +03 15 33.20  22.6i 491767    W84  C~5204      
2018 01  05.05847  02 52 36.792  +03 19 15.73  23.4r 491767    W84  C~5204      
2018 01  05.05983  02 52 36.797  +03 19 15.67  24.3g 491767    W84  C~5204      

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     0.23       0.00    -0.30
     2   0.0000      0.00     0.23       0.00    -0.34
     3   0.0000      0.00     0.24       0.00    -0.34
     4   3.8300      0.00    -0.05       0.00     0.18
     5   3.8300      0.00     0.07       0.00     0.20
     6   3.8300      0.00     0.00       0.00     0.13
     7   3.8301      0.00     0.03       0.00     0.19
     8   3.8824      0.00     0.04       0.00     0.03
     9   3.8824      0.00     0.13       0.00     0.02
    10   4.6190      0.00    -0.05       0.00    -0.00
    11   4.6191      0.00     0.15       0.00     0.10
    12   4.6191      0.00    -0.04       0.00     0.09
    13   4.6437      0.00     0.02       0.00    -0.27
    14   4.6437      0.00    -0.04       0.00    -0.01
    15   4.6437      0.00     0.21       0.00     0.25
    16   4.6438      0.00    -0.24       0.00     0.36
    17   4.6495      0.00     0.27       0.00    -0.01
    18   4.8241      0.00    -0.13       0.00    -0.26
    19   4.9472      0.00    -0.20       0.00    -0.16
    20   4.9472      0.00     0.01       0.00    -0.11
    21   5.5886      0.00     0.15       0.00    -0.13
    22   5.6296      0.00     0.07       0.00     0.10
    23   5.6297      0.00     0.04       0.00     0.21
    24   5.7033      0.00     0.30       0.00    -0.25
    25   5.7086      0.00    -0.04       0.00     0.13
    26   5.7086      0.00    -0.18       0.00     0.19
    27   5.7086      0.00    -0.38       0.00     0.29
    28   5.7630      0.00    -0.26       0.00     0.19
    29   5.7630      0.00    -0.07       0.00    -0.05
    30   5.7631      0.00    -0.21       0.00     0.03
    31   5.7767      0.00    -0.47       0.00     0.15
    32   5.7767      0.00    -0.15       0.00     0.23
    33   5.7822      0.00    -0.23       0.00     0.09
    34   5.7822      0.00    -0.48       0.00     0.13
    35   5.7822      0.00    -0.46       0.00     0.01
    36   5.7962      0.00    -0.19       0.00     0.11
    37   5.7962      0.00    -0.14       0.00     0.15
    38   6.9103      0.00     0.09       0.00    -0.08
    39   7.6855      0.00     0.15       0.00     0.02
    40   7.6855      0.00     0.02       0.00    -0.07
    41   7.6855      0.00     0.20       0.00    -0.16
    42   7.6882      0.00    -0.07       0.00     0.13
    43   7.6882      0.00     0.02       0.00     0.01
    44   7.6909      0.00     0.31       0.00    -0.04
    45   7.7756      0.00    -0.01       0.00    -0.05
    46   7.7756      0.00     0.15       0.00    -0.15
    47   7.8412      0.00    -0.06       0.00     0.05
    48   7.8412      0.00     0.01       0.00     0.13
    49   7.8412      0.00     0.14       0.00    -0.02
    50   7.9287      0.00    -0.08       0.00     0.17
    51   7.9287      0.00     0.09       0.00    -0.07
    52   8.7752      0.00     0.43       0.00    -0.47
    53   8.7913      0.00     0.30       0.00    -0.15
    54   8.8978      0.00    -0.06       0.00    -0.11
    55   8.8978      0.00     0.02       0.00    -0.21
    56   8.9689      0.00     0.09       0.00    -0.07
    57   8.9689      0.00     0.22       0.00    -0.16

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.

491767    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.812    39.812    39.812
ecceobj         0.084     0.084     0.084
incobj         30.079    30.079    30.079
qmin           35.261    35.217    34.938
qmax           43.999    44.235    44.429
amean          39.461    39.460    39.459
amin           39.103    39.103    39.101
amax           39.835    39.835    39.835
emean           0.058     0.062     0.073
emin            0.005     0.002     0.005
emax            0.106     0.113     0.119
imean          28.860    28.864    28.790
imin           28.325    28.331    28.312
imax           29.311    29.334    29.269
excite_mean     0.487     0.487     0.487
fracstop        1.000     1.000     1.000
cjmean          2.764     2.764     2.764

libcent 0       180.8     164.9     180.3
libamp  0        93.7     110.1      93.2
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       181.6     184.2     183.7
kozaiamp        180.0     180.0     180.0