Orbit Fit and Astrometric record for 19EY8

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: 19EY8     
# Created Tue Apr  1 01:11:12 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:   4.19y
# First observation: 2015/01/25
#  Last observation: 2019/04/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000077   0.025815   0.000002  -0.000667   0.024869   0.000000
# Chi-squared of fit:     5.96 DOF:     24 RMS:  0.11
# Min/Max residuals:    -0.22    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.587108E-05  2.554435E-02 -3.796013E-07 -6.621604E-04  2.475025E-02 -1.085992E-04
# Covariance matrix:
  8.8248E-13  4.2780E-14 -4.9793E-15 -5.7491E-15  5.2338E-13  2.1183E-12
  4.2780E-14  1.2955E-12 -7.7253E-15 -3.1595E-14  1.3663E-12  1.2499E-11
 -4.9793E-15 -7.7253E-15  7.0503E-13 -1.7954E-13 -1.5770E-14 -7.4577E-14
 -5.7491E-15 -3.1595E-14 -1.7954E-13  5.3852E-14 -3.4927E-14 -3.1778E-13
  5.2338E-13  1.3663E-12 -1.5770E-14 -3.4927E-14  2.0663E-12  1.3502E-11
  2.1183E-12  1.2499E-11 -7.4577E-14 -3.1778E-13  1.3502E-11  1.2585E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.011790  173.850756    0.740415    0.045309   -0.643850  2457048.065643
# Heliocentric elements and errors
Epoch:              2457040.5000  =  2015/01/18
Mean Anomaly:          350.68026 +/-     0.184
Argument of Peri:      121.44647 +/-     0.234
Long of Asc Node:       63.09475 +/-     0.006
Inclination:             4.19290 +/-     0.000
Eccentricity:         0.11506028 +/-    0.0002
Semi-Major Axis:     46.29471302 +/-    0.0090
Time of Perihelion: 2460018.9936 +/-      58.7
Perihelion:          40.96803028 +/-    0.0114
Aphelion:            51.62139575 +/-    0.0129
Period (y)              314.9962 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.63814760 +/-    0.0023
Ecliptic Y            5.12275794 +/-    0.0003
Ecliptic Z            2.82667951 +/-    0.0002
Ecliptic XDOT        -0.00029968 +/-    0.0000
Ecliptic YDOT        -0.00281557 +/-    0.0000
Ecliptic ZDOT        -0.00007381 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.05717728 +/-    0.0023
Geocenter to KBO     40.40362998 +/-    0.0023
# Hcoef:  8.18

The following table shows the complete astrometric record for 19EY8. 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 (19EY8) followed by the observatory code and reference code for the source of the astrometry.

2015 01  25.564865 11 43 48.20   +06 07 29.1         19EY8     T09  C~8Do3      
2015 03  17.308664 11 40 28.97   +06 30 48.7         19EY8     T09  C~8Do3      
2018 03  18.483490 11 56 33.85   +04 38 39.3         19EY8     T09  C~8Do3      
2018 03  18.597393 11 56 33.32   +04 38 42.6         19EY8     T09  C~8Do3      
2018 04  22.422267 11 54 04.23   +04 53 29.4         19EY8     T09  C~8Do3      
2019 02  05.59538  12 04 40.63   +03 41 32.1   24.3i 19EY8     T09  C~8Do3      
2019 02  05.63575  12 04 40.52   +03 41 32.9   23.9i 19EY8     T09  C~8Do3      
2019 02  05.63843  12 04 40.52   +03 41 33.3   24.1i 19EY8     T09  C~8Do3      
2019 03  03.51493  12 03 04.53   +03 53 10.2   23.8z 19EY8     T09  C~8Do3      
2019 03  03.59019  12 03 04.18   +03 53 12.6   24.2z 19EY8     T09  C~8Do3      
2019 03  03.63045  12 03 04.02   +03 53 13.8   24.4z 19EY8     T09  C~8Do3      
2019 03  03.64654  12 03 03.96   +03 53 14.3   23.9z 19EY8     T09  C~8Do3      
2019 04  04.440820 12 00 40.81   +04 08 34.4         19EY8     T09  C~8Do3      
2019 04  04.467836 12 00 40.69   +04 08 35.0         19EY8     T09  C~8Do3      
2019 04  05.530772 12 00 36.01   +04 09 03.1         19EY8     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     0.09       0.00    -0.01
     2   0.1389  -3282.11    -0.07     105.26    -0.05
     3   3.1428  12626.95     0.04    -308.07     0.07
     4   3.1431  12618.33     0.05    -308.24     0.03
     5   3.2385  10213.88    -0.16    -392.50     0.18
     6   4.0302  20726.67    -0.22    -504.40    -0.15
     7   4.0303  20724.82     0.02    -504.33    -0.20
     8   4.0303  20724.66    -0.01    -503.96     0.16
     9   4.1012  19113.93     0.16    -447.67    -0.14
    10   4.1014  19108.12    -0.20    -447.59    -0.10
    11   4.1015  19105.42     0.00    -447.47     0.02
    12   4.1015  19104.39     0.13    -447.37     0.10
    13   4.1886  16755.64    -0.02    -471.29     0.08
    14   4.1886  16753.74     0.05    -471.47    -0.02
    15   4.1916  16677.85     0.15    -474.04     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.

19EY8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.866    45.889    45.842
ecceobj         0.106     0.107     0.106
incobj          4.193     4.193     4.193
qmin           40.299    40.339    40.274
qmax           52.093    52.134    52.039
amean          46.046    46.069    46.022
amin           45.669    45.676    45.649
amax           46.464    46.485    46.429
emean           0.108     0.108     0.107
emin            0.095     0.095     0.095
emax            0.121     0.122     0.121
imean           2.896     2.897     2.895
imin            2.459     2.462     2.455
imax            3.369     3.368     3.365
excite_mean     0.119     0.119     0.119
fracstop        1.000     1.000     1.000
cjmean          3.109     3.110     3.109

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       181.0     181.0     181.2
kozaiamp        180.0     180.0     180.0