Orbit Fit and Astrometric record for 14YW91

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: 14YW91    
# Created Sat Nov 27 02:13:14 2021
# Orbit generated from Bernstein formalism
# Fitting     23 observations of     23
# Arc:   4.19y
# First observation: 2013/10/27
#  Last observation: 2018/01/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000271   0.025291   0.000107  -0.009060   0.026877   0.000000
# Chi-squared of fit:    10.81 DOF:     40 RMS:  0.12
# Min/Max residuals:    -0.30    0.34
# Exact a, adot, b, bdot, g, gdot:
  1.389831E-05  2.489392E-02 -5.364868E-06 -8.901645E-03  2.613435E-02 -4.137996E-03
# Covariance matrix:
  8.5485E-13 -6.3183E-13 -1.5336E-13  1.7683E-13 -1.9961E-13 -4.2200E-12
 -6.3183E-13  6.4423E-13  1.8267E-13 -2.1253E-13  2.6756E-13  5.0732E-12
 -1.5336E-13  1.8267E-13  4.9574E-13 -2.0100E-13  7.1257E-14  1.5536E-12
  1.7683E-13 -2.1253E-13 -2.0100E-13  1.2498E-13 -9.8034E-14 -1.8124E-12
 -1.9961E-13  2.6756E-13  7.1257E-14 -9.8034E-14  3.4122E-13  2.3500E-12
 -4.2200E-12  5.0732E-12  1.5536E-12 -1.8124E-12  2.3500E-12  4.3265E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -14.614035   20.381858   -0.225908   -0.243864   -0.935746  2456592.627628
# Heliocentric elements and errors
Epoch:              2456590.5000  =  2013/10/25
Mean Anomaly:          294.31732 +/-     0.017
Argument of Peri:      300.68366 +/-     0.027
Long of Asc Node:      165.97449 +/-     0.001
Inclination:            24.02603 +/-     0.000
Eccentricity:         0.15903533 +/-    0.0003
Semi-Major Axis:     40.94660961 +/-    0.0044
Time of Perihelion: 2474051.6843 +/-       3.5
Perihelion:          34.43465204 +/-    0.0109
Aphelion:            47.45856717 +/-    0.0115
Period (y)              262.0204 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           35.53474601 +/-    0.0008
Ecliptic Y           13.44663382 +/-    0.0003
Ecliptic Z           -9.65444220 +/-    0.0002
Ecliptic XDOT        -0.00152821 +/-    0.0000
Ecliptic YDOT         0.00221501 +/-    0.0000
Ecliptic ZDOT        -0.00079286 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.20125495 +/-    0.0007
Geocenter to KBO     38.26382048 +/-    0.0009
# Hcoef:  7.54

The following table shows the complete astrometric record for 14YW91. 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 (14YW91) followed by the observatory code and reference code for the source of the astrometry.

2013 10  27.12685  01 37 12.057  -05 35 28.86  24.1g 14YW91    W84  C~52Uq      
2014 12  16.14065  01 40 08.682  -05 42 09.00  23.0i 14YW91    W84  C~52Uq      
2014 12  25.09642  01 39 52.826  -05 40 57.33  23.3r 14YW91    W84  C~52Uq      
2014 12  25.09779  01 39 52.845  -05 40 56.97  23.4i 14YW91    W84  C~52Uq      
2015 08  18.41466  01 53 48.791  -04 44 17.84  23.1r 14YW91    W84  C~52Uq      
2015 10  17.21199  01 50 18.095  -05 22 20.94  23.6r 14YW91    W84  C~52Uq      
2015 11  16.14155  01 47 56.465  -05 35 14.45  23.3r 14YW91    W84  C~52Uq      
2015 11  16.14430  01 47 56.457  -05 35 14.45  24.1g 14YW91    W84  C~52Uq      
2016 09  28.43116  01 57 53.32   -05 07 02.4   24.0g 14YW91    568  C~2eAJ      
2016 09  28.55086  01 57 52.79   -05 07 07.1   24.0g 14YW91    568  C~2eAJ      
2016 09  29.44269  01 57 48.95   -05 07 41.8   24.0g 14YW91    568  C~2eAJ      
2016 09  29.56239  01 57 48.42   -05 07 46.5   24.0g 14YW91    568  C~2eAJ      
2016 10  22.19607  01 56 02.023  -05 21 10.87  22.9r 14YW91    W84  C~52Uq      
2016 10  22.19744  01 56 02.004  -05 21 10.65  23.3i 14YW91    W84  C~52Uq      
2016 10  22.20196  01 56 02.013  -05 21 10.87  24.0g 14YW91    W84  C~52Uq      
2016 12  06.05834  01 52 46.340  -05 34 34.04  23.3z 14YW91    W84  C~52Uq      
2017 09  18.38916  02 04 48.362  -04 55 33.24  22.7i 14YW91    W84  C~52Uq      
2017 09  26.28827  02 04 17.530  -05 00 50.25  23.4r 14YW91    W84  C~52Uq      
2017 09  26.28964  02 04 17.518  -05 00 50.29  23.8g 14YW91    W84  C~52Uq      
2017 11  27.14500  01 59 30.846  -05 29 20.41  22.9i 14YW91    W84  C~52Uq      
2017 12  07.11748  01 58 54.452  -05 30 18.41  24.0r 14YW91    W84  C~52Uq      
2017 12  14.06076  01 58 33.290  -05 30 15.65  24.2g 14YW91    W84  C~52Uq      
2018 01  05.07979  01 57 53.926  -05 26 15.33  22.6z 14YW91    W84  C~52Uq      

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    -0.00
     2   1.1362   2293.84    -0.22   -1360.30     0.16
     3   1.1608   2101.42    -0.30   -1204.93    -0.09
     4   1.1608   2101.82     0.12   -1204.70     0.11
     5   1.8078  14974.06    -0.18   -2786.55    -0.17
     6   1.9715  11178.97     0.23   -3701.39     0.01
     7   2.0534   8923.11    -0.08   -3613.87    -0.05
     8   2.0534   8923.00    -0.01   -3613.83    -0.03
     9   2.9221  17852.12    -0.03   -5454.07     0.06
    10   2.9224  17842.94    -0.10   -5455.38     0.06
    11   2.9249  17776.15     0.02   -5465.47     0.04
    12   2.9252  17766.97     0.01   -5466.78    -0.01
    13   2.9872  15978.54     0.00   -5601.30    -0.17
    14   2.9872  15978.36    -0.07   -5600.99     0.15
    15   2.9872  15978.40     0.34   -5601.24    -0.11
    16   3.1100  12954.93     0.13   -5225.56    -0.02
    17   3.8939  23911.02    -0.10   -7217.14     0.02
    18   3.9156  23356.48     0.03   -7332.21    -0.04
    19   3.9156  23356.29    -0.05   -7332.18     0.01
    20   4.0849  18694.80     0.04   -7257.73    -0.03
    21   4.1122  18165.92     0.04   -7101.43     0.06
    22   4.1312  17872.54    -0.20   -6976.79     0.05
    23   4.1915  17417.38     0.12   -6527.01    -0.02

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.

14YW91    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.130    41.141    41.118
ecceobj         0.157     0.158     0.157
incobj         23.957    23.957    23.957
qmin           33.721    33.653    33.647
qmax           48.360    48.496    48.387
amean          40.857    40.903    40.840
amin           40.491    40.535    40.487
amax           41.227    41.297    41.230
emean           0.153     0.155     0.154
emin            0.134     0.135     0.134
emax            0.173     0.176     0.175
imean          23.603    23.594    23.578
imin           22.938    22.891    22.915
imax           24.348    24.310    24.354
excite_mean     0.429     0.429     0.429
fracstop        1.000     1.000     1.000
cjmean          2.847     2.847     2.848

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       175.1     176.7     175.0
kozaiamp        180.0     180.0     180.0