Orbit Fit and Astrometric record for 19EZ8

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: 19EZ8     
# Created Thu Apr  3 01:11:16 2025
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     14
# Arc:   1.05y
# First observation: 2018/03/18
#  Last observation: 2019/04/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000027   0.022729   0.000000  -0.001090   0.023347   0.000000
# Chi-squared of fit:     2.93 DOF:     22 RMS:  0.08
# Min/Max residuals:    -0.14    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.507425E-05  2.271499E-02 -4.803431E-07 -1.091643E-03  2.354087E-02 -8.843751E-04
# Covariance matrix:
  4.8848E-13  1.0208E-12  7.3114E-15 -7.9188E-14  1.1218E-12  6.7070E-11
  1.0208E-12  1.8383E-11  7.0234E-14 -9.3797E-13  1.0170E-11  7.8142E-10
  7.3114E-15  7.0234E-14  3.1927E-13 -3.5363E-13  5.0199E-14  3.2880E-12
 -7.9188E-14 -9.3797E-13 -3.5363E-13  6.2297E-13 -5.7268E-13 -4.1912E-11
  1.1218E-12  1.0170E-11  5.0199E-14 -5.7268E-13  7.6031E-12  4.8292E-10
  6.7070E-11  7.8142E-10  3.2880E-12 -4.1912E-11  4.8292E-10  3.5036E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.868927  177.454428    0.004480    0.067179   -0.992070  2458195.984291
# Heliocentric elements and errors
Epoch:              2458190.5000  =  2018/03/13
Mean Anomaly:          310.81695 +/-     4.596
Argument of Peri:      179.84655 +/-     5.493
Long of Asc Node:       51.43700 +/-     0.020
Inclination:             4.67051 +/-     0.001
Eccentricity:         0.05251164 +/-    0.0068
Semi-Major Axis:     44.94090964 +/-    0.0370
Time of Perihelion: 2473224.4872 +/-    1404.7
Perihelion:          42.58098887 +/-    0.3089
Aphelion:            47.30083041 +/-    0.3094
Period (y)              301.2805 +/-      0.37
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -43.33520450 +/-    0.0050
Ecliptic Y            1.92388199 +/-    0.0002
Ecliptic Z            2.86625935 +/-    0.0003
Ecliptic XDOT        -0.00001701 +/-    0.0000
Ecliptic YDOT        -0.00264785 +/-    0.0000
Ecliptic ZDOT        -0.00013376 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.47248226 +/-    0.0049
Geocenter to KBO     42.47931049 +/-    0.0050
# Hcoef:  7.71

The following table shows the complete astrometric record for 19EZ8. 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 (19EZ8) followed by the observatory code and reference code for the source of the astrometry.

2018 03  18.483490 11 56 49.40   +04 33 42.2         19EZ8     T09  C~8Do3      
2018 03  18.554649 11 56 49.08   +04 33 44.3         19EZ8     T09  C~8Do3      
2018 03  18.594723 11 56 48.91   +04 33 45.4         19EZ8     T09  C~8Do3      
2018 04  24.379218 11 54 19.53   +04 48 24.1         19EZ8     T09  C~8Do3      
2018 04  24.501401 11 54 19.11   +04 48 26.0         19EZ8     T09  C~8Do3      
2019 02  05.54825  12 04 08.55   +03 40 50.5   24.0i 19EZ8     T09  C~8Do3      
2019 02  05.56537  12 04 08.51   +03 40 50.9   23.9i 19EZ8     T09  C~8Do3      
2019 02  05.59538  12 04 08.42   +03 40 51.6   24.2i 19EZ8     T09  C~8Do3      
2019 02  05.63575  12 04 08.30   +03 40 52.6   24.0i 19EZ8     T09  C~8Do3      
2019 02  05.63843  12 04 08.29   +03 40 52.6   24.0i 19EZ8     T09  C~8Do3      
2019 03  03.51493  12 02 36.11   +03 51 53.7   23.8z 19EZ8     T09  C~8Do3      
2019 03  03.63045  12 02 35.64   +03 51 56.8   23.4z 19EZ8     T09  C~8Do3      
2019 03  03.64654  12 02 35.56   +03 51 57.4   23.7z 19EZ8     T09  C~8Do3      
2019 04  04.440820 12 00 18.74   +04 06 29.5         19EZ8     T09  C~8Do3      

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     0.04       0.00    -0.05
     2   0.0002     -5.23    -0.06       0.02     0.04
     3   0.0003     -8.00     0.05       0.01     0.07
     4   0.1010  -2406.52    -0.10     -83.33     0.09
     5   0.1013  -2413.04     0.07     -84.09    -0.14
     6   0.8872   7293.28    -0.09    -281.06    -0.13
     7   0.8873   7292.57     0.04    -280.93    -0.05
     8   0.8874   7291.06     0.00    -280.83    -0.03
     9   0.8875   7289.01    -0.06    -280.63     0.06
    10   0.8875   7288.87    -0.06    -280.69    -0.01
    11   0.9583   5758.34     0.01    -227.53     0.07
    12   0.9587   5750.65     0.24    -227.50     0.04
    13   0.9587   5749.31    -0.00    -227.43     0.10
    14   1.0457   3522.91    -0.08    -247.11    -0.05

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.

19EZ8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.598    44.654    44.562
ecceobj         0.044     0.062     0.039
incobj          4.680     4.681     4.679
qmin           42.047    41.383    42.273
qmax           47.667    48.531    47.403
amean          44.779    44.842    44.741
amin           44.427    44.480    44.402
amax           45.143    45.217    45.097
emean           0.043     0.060     0.038
emin            0.029     0.046     0.024
emax            0.057     0.074     0.051
imean           3.542     3.525     3.546
imin            3.047     3.001     3.052
imax            4.028     4.030     4.028
excite_mean     0.075     0.086     0.073
fracstop        1.000     1.000     1.000
cjmean          3.104     3.103     3.104

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       188.0     185.2     188.2
kozaiamp        180.0     179.9     180.0