Orbit Fit and Astrometric record for 19EU8

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: 19EU8     
# Created Wed Dec 25 02:11:01 2024
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   4.75y
# First observation: 2018/04/22
#  Last observation: 2023/01/21
Preliminary a, adot, b, bdot, g, gdot:
   0.000059   0.016825   0.000000   0.000884   0.019697   0.000000
# Chi-squared of fit:     6.05 DOF:     30 RMS:  0.10
# Min/Max residuals:    -0.34    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.279806E-05  1.674438E-02  1.591423E-06  8.831996E-04  1.988162E-02 -1.509770E-03
# Covariance matrix:
  9.9098E-13 -1.0311E-12  2.5751E-14 -3.5852E-14 -2.3188E-13 -8.3640E-12
 -1.0311E-12  1.8897E-12 -4.3947E-14  5.8107E-14 -3.1891E-13  1.4954E-11
  2.5751E-14 -4.3947E-14  1.8805E-13 -5.8875E-14  3.8402E-15 -3.5854E-13
 -3.5852E-14  5.8107E-14 -5.8875E-14  3.3190E-14 -2.6297E-15  4.7731E-13
 -2.3188E-13 -3.1891E-13  3.8402E-15 -2.6297E-15  5.9640E-13 -1.8478E-12
 -8.3640E-12  1.4954E-11 -3.5854E-13  4.7731E-13 -1.8478E-12  1.2128E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    5.005692 -178.173580   -0.497916    0.075807   -0.864801  2458230.887863
# Heliocentric elements and errors
Epoch:              2458230.5000  =  2018/04/22
Mean Anomaly:          235.75567 +/-     0.169
Argument of Peri:      192.54343 +/-     0.168
Long of Asc Node:      123.51475 +/-     0.005
Inclination:             5.74272 +/-     0.000
Eccentricity:         0.10589217 +/-    0.0006
Semi-Major Axis:     47.97220665 +/-    0.0078
Time of Perihelion: 2500115.3570 +/-      56.0
Perihelion:          42.89232539 +/-    0.0273
Aphelion:            53.05208790 +/-    0.0278
Period (y)              332.2712 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -50.93330630 +/-    0.0019
Ecliptic Y           -2.12957600 +/-    0.0001
Ecliptic Z            4.38883570 +/-    0.0002
Ecliptic XDOT         0.00029772 +/-    0.0000
Ecliptic YDOT        -0.00230196 +/-    0.0000
Ecliptic ZDOT         0.00010286 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   51.16638216 +/-    0.0019
Geocenter to KBO     50.29770822 +/-    0.0020
# Hcoef:  8.32

The following table shows the complete astrometric record for 19EU8. 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 (19EU8) followed by the observatory code and reference code for the source of the astrometry.

2018 04  22.387062 12 14 40.44   +03 51 58.0         19EU8     T09  C~89Ve      
2019 02  05.56175  12 22 32.62   +03 02 05.3   24.8i 19EU8     T09  C~89Ve      
2019 02  05.60340  12 22 32.53   +03 02 06.1   25.3i 19EU8     T09  C~89Ve      
2019 02  05.63031  12 22 32.46   +03 02 06.6   25.2i 19EU8     T09  C~89Ve      
2019 02  05.63299  12 22 32.46   +03 02 06.8   24.8i 19EU8     T09  C~89Ve      
2019 03  03.587501 12 21 18.29   +03 12 02.2         19EU8     T09  C~89Ve      
2019 03  03.638501 12 21 18.13   +03 12 03.4         19EU8     T09  C~89Ve      
2019 04  04.45230  12 19 21.57   +03 25 19.0   25.5g 19EU8     T09  C~89Ve      
2019 04  04.47412  12 19 21.48   +03 25 19.3   26.3g 19EU8     T09  C~89Ve      
2019 04  04.49722  12 19 21.41   +03 25 20.0   26.2g 19EU8     T09  C~89Ve      
2019 04  06.311690 12 19 14.73   +03 26 02.1         19EU8     T09  C~89Ve      
2020 01  30.609170 12 26 21.10   +02 39 51.8         19EU8     T09  C~89Ve      
2020 01  30.622911 12 26 21.07   +02 39 52.0         19EU8     T09  C~89Ve      
2020 01  30.663460 12 26 21.00   +02 39 52.8         19EU8     T09  C~89Ve      
2023 01  21.615866 12 37 21.16   +01 36 30.6         19EU8     T14  C~89Ve      
2023 01  21.619158 12 37 21.15   +01 36 30.6         19EU8     T14  C~89Ve      
2023 01  21.621060 12 37 21.15   +01 36 30.7         19EU8     T14  C~89Ve      
2023 01  21.625739 12 37 21.14   +01 36 30.8         19EU8     T14  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     0.11       0.00    -0.18
     2   0.7917   7680.25     0.03      80.64     0.02
     3   0.7918   7678.69     0.10      80.84     0.02
     4   0.7919   7677.53    -0.01      80.88    -0.06
     5   0.7919   7677.45     0.01      81.06     0.11
     6   0.8630   6419.63    -0.34     182.10    -0.07
     7   0.8631   6416.95    -0.10     182.24    -0.04
     8   0.9502   4497.60    -0.09     213.43     0.06
     9   0.9503   4496.25    -0.11     213.16    -0.18
    10   0.9503   4495.01     0.06     213.39     0.07
    11   0.9553   4386.44     0.19     212.00     0.12
    12   1.7747  11358.64     0.10     230.96     0.08
    13   1.7748  11358.14     0.04     230.96     0.01
    14   1.7749  11356.86     0.05     231.27     0.12
    15   4.7508  22017.59     0.08     731.05    -0.00
    16   4.7508  22017.46     0.00     730.99    -0.08
    17   4.7508  22017.42    -0.00     731.08    -0.00
    18   4.7508  22017.24    -0.09     731.11     0.00

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.

19EU8    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        47.560    47.585    47.536
ecceobj         0.109     0.109     0.110
incobj          5.743     5.742     5.743
qmin           40.945    41.005    40.799
qmax           55.011    55.017    55.114
amean          47.799    47.799    47.799
amin           47.383    47.375    47.364
amax           48.269    48.275    48.274
emean           0.117     0.116     0.120
emin            0.094     0.091     0.097
emax            0.140     0.140     0.143
imean           4.310     4.325     4.311
imin            3.959     3.965     3.964
imax            4.799     4.779     4.749
excite_mean     0.139     0.138     0.141
fracstop        1.000     1.000     1.000
cjmean          3.125     3.126     3.124

libcent 0        99.0      99.8      99.0
libamp  0        26.0      29.5      28.5
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     177.9     179.6
kozaiamp        180.0     180.0     179.9