Orbit Fit and Astrometric record for 19EW8

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: 19EW8     
# Created Wed Dec 25 02:11:01 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     15 observations of     15
# Arc:   8.90y
# First observation: 2012/02/16
#  Last observation: 2021/01/11
# Chi-squared of fit:     7.21 DOF:     24 RMS:  0.12
# Min/Max residuals:    -0.17    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.867598E-05  3.532142E-02 -4.283012E-06 -7.296882E-03  3.042027E-02  1.087301E-04
# Covariance matrix:
  7.2486E-13 -1.9067E-13 -1.8769E-14  2.1430E-14 -7.2026E-14 -3.3747E-13
 -1.9067E-13  2.1707E-13  3.5311E-14 -4.2782E-14  5.0910E-13  6.8466E-13
 -1.8769E-14  3.5311E-14  6.3901E-13 -9.3626E-14  8.5352E-14  1.1870E-13
  2.1430E-14 -4.2782E-14 -9.3626E-14  2.2798E-14 -1.0989E-13 -1.4430E-13
 -7.2026E-14  5.0910E-13  8.5352E-14 -1.0989E-13  2.2134E-12  1.7858E-12
 -3.3747E-13  6.8466E-13  1.1870E-13 -1.4430E-13  1.7858E-12  2.3113E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    7.396963  166.469203    0.326988    0.120264   -0.926270  2455973.962934
# Heliocentric elements and errors
Epoch:              2455974.5000  =  2012/02/17
Mean Anomaly:          359.09096 +/-     0.009
Argument of Peri:      149.33379 +/-     0.014
Long of Asc Node:       17.24025 +/-     0.000
Inclination:            13.64209 +/-     0.000
Eccentricity:         0.20147279 +/-    0.0002
Semi-Major Axis:     42.32371372 +/-    0.0101
Time of Perihelion: 2456228.4541 +/-      35.9
Perihelion:          33.79663714 +/-    0.0103
Aphelion:            50.85079030 +/-    0.0137
Period (y)              275.3492 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.52317377 +/-    0.0016
Ecliptic Y            8.16457457 +/-    0.0004
Ecliptic Z            4.23199909 +/-    0.0002
Ecliptic XDOT        -0.00084006 +/-    0.0000
Ecliptic YDOT        -0.00306443 +/-    0.0000
Ecliptic ZDOT        -0.00064990 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   33.79832978 +/-    0.0015
Geocenter to KBO     32.87284956 +/-    0.0016
# Hcoef:  8.37

The following table shows the complete astrometric record for 19EW8. 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 (19EW8) followed by the observatory code and reference code for the source of the astrometry.

2012 02  16.462168 11 21 55.56   +12 08 47.4         19EW8     T14  C~8Aix      
2012 02  16.491318 11 21 55.41   +12 08 48.2         19EW8     T14  C~8Aix      
2017 03  01.254145 11 54 48.211  +06 14 25.04  22.8r 19EW8     W84  C~8HR7      
2018 03  18.557320 11 59 56.82   +05 10 13.6         19EW8     T09  C~8Aix      
2018 03  18.597393 11 59 56.59   +05 10 14.9         19EW8     T09  C~8Aix      
2019 02  05.59805  12 09 51.86   +03 36 36.1   23.5i 19EW8     T09  C~8Aix      
2019 02  05.63843  12 09 51.71   +03 36 37.1   23.6i 19EW8     T09  C~8Aix      
2019 02  05.64110  12 09 51.69   +03 36 37.1   23.5i 19EW8     T09  C~8Aix      
2019 03  03.53922  12 07 57.78   +03 48 49.9   23.3z 19EW8     T09  C~8Aix      
2019 03  03.59287  12 07 57.50   +03 48 51.9   23.9z 19EW8     T09  C~8Aix      
2019 03  03.63313  12 07 57.29   +03 48 52.8   23.8z 19EW8     T09  C~8Aix      
2019 04  04.467836 12 05 04.17   +04 05 13.1         19EW8     T09  C~8Aix      
2021 01  11.621188 12 23 40.64   +01 05 55.7         19EW8     T14  C~8Aix      
2021 01  11.629135 12 23 40.63   +01 05 55.8         19EW8     T14  C~8Aix      
2021 01  11.639535 12 23 40.62   +01 05 55.8         19EW8     T14  C~8Aix      

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    -0.02       0.00     0.12
     2   0.0001      0.00     0.03       0.00    -0.06
     3   5.0371      0.00     0.10       0.00    -0.14
     4   6.0838      0.00     0.06       0.00    -0.17
     5   6.0839      0.00    -0.01       0.00    -0.12
     6   6.9709      0.00     0.10       0.00    -0.04
     7   6.9711      0.00     0.01       0.00    -0.00
     8   6.9711      0.00    -0.15       0.00    -0.06
     9   7.0420      0.00    -0.15       0.00     0.11
    10   7.0421      0.00    -0.13       0.00     0.44
    11   7.0422      0.00    -0.13       0.00     0.08
    12   7.1294      0.00     0.10       0.00    -0.09
    13   8.9039      0.00     0.12       0.00    -0.04
    14   8.9039      0.00     0.05       0.00     0.01
    15   8.9040      0.00     0.01       0.00    -0.04

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.

19EW8    quality flag:3

Type:          5:3EE     5:3EE     5:3EE

axisobj        42.316    42.316    42.316
ecceobj         0.201     0.201     0.201
incobj         13.643    13.643    13.643
qmin           31.966    31.968    31.964
qmax           53.302    53.306    53.297
amean          42.327    42.327    42.327
amin           41.884    41.868    41.873
amax           42.849    42.844    42.831
emean           0.208     0.208     0.207
emin            0.163     0.166     0.162
emax            0.245     0.245     0.245
imean          12.897    12.882    12.845
imin           11.370    11.373    11.367
imax           14.533    14.527    14.575
excite_mean     0.306     0.306     0.305
fracstop        1.000     1.000     1.000
cjmean          2.971     2.971     2.972

libcent 0       180.8     178.8     178.7
libamp  0        86.8      89.1      90.8
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       155.3     157.5     167.2
kozaiamp        180.0     180.0     179.9