Orbit Fit and Astrometric record for 19ET8

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: 19ET8     
# Created Wed Dec 25 02:11:01 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     16 observations of     16
# Arc:   5.93y
# First observation: 2013/04/01
#  Last observation: 2019/03/08
# Chi-squared of fit:     2.35 DOF:     26 RMS:  0.07
# Min/Max residuals:    -0.17    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.471340E-05  2.125704E-02  1.262019E-07  1.369721E-04  2.286828E-02 -5.925222E-04
# Covariance matrix:
  1.4682E-12 -5.2425E-13  7.3520E-16 -1.8454E-15 -2.7079E-13 -2.1581E-12
 -5.2425E-13  1.0476E-12 -1.5453E-15  6.8264E-15  1.7033E-12  8.2117E-12
  7.3520E-16 -1.5453E-15  1.3503E-12 -2.3963E-13 -9.2413E-16 -1.1269E-14
 -1.8454E-15  6.8264E-15 -2.3963E-13  4.5607E-14  1.2143E-14  5.6386E-14
 -2.7079E-13  1.7033E-12 -9.2413E-16  1.2143E-14  4.1202E-12  1.4963E-11
 -2.1581E-12  8.2117E-12 -1.1269E-14  5.6386E-14  1.4963E-11  6.8120E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.430591  169.172274   -0.381011    0.055427   -0.923490  2456383.683415
# Heliocentric elements and errors
Epoch:              2456384.5000  =  2013/04/02
Mean Anomaly:          219.29875 +/-     0.860
Argument of Peri:      226.97171 +/-     0.843
Long of Asc Node:       85.32998 +/-     0.010
Inclination:             3.37592 +/-     0.000
Eccentricity:         0.02727891 +/-    0.0002
Semi-Major Axis:     43.71802454 +/-    0.0125
Time of Perihelion: 2497649.7675 +/-     253.7
Perihelion:          42.52544446 +/-    0.0139
Aphelion:            44.91060462 +/-    0.0145
Period (y)              289.0673 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -43.85284850 +/-    0.0038
Ecliptic Y            8.00147462 +/-    0.0007
Ecliptic Z            2.61668851 +/-    0.0002
Ecliptic XDOT        -0.00041386 +/-    0.0000
Ecliptic YDOT        -0.00251269 +/-    0.0000
Ecliptic ZDOT         0.00001226 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.65359946 +/-    0.0037
Geocenter to KBO     43.72874088 +/-    0.0039
# Hcoef:  6.58

The following table shows the complete astrometric record for 19ET8. 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 (19ET8) followed by the observatory code and reference code for the source of the astrometry.

2013 04  01.182637 11 25 36.46   +07 26 25.0         19ET8     W84  C~89Ve      
2018 03  18.551980 11 49 13.27   +04 55 52.9         19ET8     T09  C~89Ve      
2018 03  18.592051 11 49 13.10   +04 55 53.9         19ET8     T09  C~89Ve      
2018 03  19.217669 11 49 10.43   +04 56 11.3   23.0r 19ET8     W84  C~89Ve      
2018 04  24.414877 11 46 48.78   +05 10 24.7         19ET8     T09  C~89Ve      
2018 04  24.461268 11 46 48.62   +05 10 25.6         19ET8     T09  C~89Ve      
2019 02  04.577421 11 56 24.40   +04 07 50.5         19ET8     T09  C~89Ve      
2019 02  04.601511 11 56 24.33   +04 07 51.1         19ET8     T09  C~89Ve      
2019 02  06.295622 11 56 19.38   +04 08 29.5   22.5z 19ET8     W84  C~89Ve      
2019 03  02.45121  11 54 52.94   +04 18 52.6   22.6y 19ET8     T09  C~89Ve      
2019 03  02.54851  11 54 52.54   +04 18 55.2   22.6y 19ET8     T09  C~89Ve      
2019 03  02.57800  11 54 52.42   +04 18 56.1   22.8y 19ET8     T09  C~89Ve      
2019 03  02.58871  11 54 52.38   +04 18 56.3   22.9y 19ET8     T09  C~89Ve      
2019 03  08.37278  11 54 28.53   +04 21 38.6   23.2r 19ET8     T09  C~89Ve      
2019 03  08.38324  11 54 28.50   +04 21 38.8   23.0r 19ET8     T09  C~89Ve      
2019 03  08.41689  11 54 28.35   +04 21 39.8   23.2r 19ET8     T09  C~89Ve      

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    -0.00
     2   4.9620      0.00    -0.08       0.00     0.06
     3   4.9621      0.00    -0.03       0.00    -0.04
     4   4.9638      0.00    -0.02       0.00    -0.10
     5   5.0629      0.00     0.13       0.00     0.03
     6   5.0630      0.00     0.02       0.00     0.11
     7   5.8464      0.00     0.03       0.00    -0.07
     8   5.8465      0.00     0.04       0.00    -0.01
     9   5.8511      0.00    -0.01       0.00     0.02
    10   5.9172      0.00    -0.03       0.00     0.02
    11   5.9175      0.00    -0.01       0.00    -0.09
    12   5.9176      0.00     0.02       0.00    -0.01
    13   5.9176      0.00     0.08       0.00    -0.11
    14   5.9334      0.00    -0.17       0.00     0.11
    15   5.9335      0.00     0.05       0.00     0.02
    16   5.9336      0.00    -0.05       0.00     0.07

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.

19ET8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.546    43.546    43.546
ecceobj         0.031     0.031     0.031
incobj          3.374     3.374     3.374
qmin           40.887    40.869    40.951
qmax           46.852    46.864    46.792
amean          43.734    43.735    43.717
amin           43.377    43.375    43.352
amax           44.101    44.097    44.109
emean           0.036     0.038     0.036
emin            0.011     0.014     0.009
emax            0.062     0.063     0.062
imean           1.689     1.691     1.698
imin            0.877     0.878     0.875
imax            2.352     2.368     2.351
excite_mean     0.048     0.049     0.047
fracstop        1.000     1.000     1.000
cjmean          3.096     3.095     3.095

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       182.5     183.7     175.3
kozaiamp        180.0     180.0     180.0