Orbit Fit and Astrometric record for 19EG8

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: 19EG8     
# Created Tue Apr  1 01:11:12 2025
# Orbit generated from Bernstein formalism
# Fitting     20 observations of     20
# Arc:   3.01y
# First observation: 2016/03/04
#  Last observation: 2019/03/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000077   0.025152   0.000014  -0.002410   0.023563   0.000000
# Chi-squared of fit:     9.29 DOF:     34 RMS:  0.12
# Min/Max residuals:    -0.27    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.602714E-05  2.500495E-02 -9.093358E-07 -2.423409E-03  2.469429E-02 -8.710523E-04
# Covariance matrix:
  2.2915E-13  1.2908E-12 -1.7015E-15 -1.2207E-13  9.6943E-13  1.8180E-11
  1.2908E-12  4.1514E-11 -4.9443E-14 -3.7269E-12  2.9371E-11  5.5564E-10
 -1.7015E-15 -4.9443E-14  1.8472E-13 -5.9884E-14 -3.8552E-14 -6.7137E-13
 -1.2207E-13 -3.7269E-12 -5.9884E-14  3.7270E-13 -2.6514E-12 -4.9959E-11
  9.6943E-13  2.9371E-11 -3.8552E-14 -2.6514E-12  2.1200E-11  3.9449E-10
  1.8180E-11  5.5564E-10 -6.7137E-13 -4.9959E-11  3.9449E-10  7.4463E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -10.382785  140.857819   -0.385467   -0.163907   -0.895513  2457451.847959
# Heliocentric elements and errors
Epoch:              2457450.5000  =  2016/03/03
Mean Anomaly:          345.02132 +/-     1.741
Argument of Peri:      260.27993 +/-     2.135
Long of Asc Node:      259.75363 +/-     0.004
Inclination:            11.50373 +/-     0.000
Eccentricity:         0.09490492 +/-    0.0013
Semi-Major Axis:     45.53792676 +/-    0.0244
Time of Perihelion: 2462120.6346 +/-     542.8
Perihelion:          41.21615365 +/-    0.0620
Aphelion:            49.85969987 +/-    0.0638
Period (y)              307.3039 +/-      0.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.84664223 +/-    0.0058
Ecliptic Y           25.41726537 +/-    0.0047
Ecliptic Z           -7.29823226 +/-    0.0014
Ecliptic XDOT        -0.00163894 +/-    0.0000
Ecliptic YDOT        -0.00224765 +/-    0.0000
Ecliptic ZDOT        -0.00024687 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.39456721 +/-    0.0053
Geocenter to KBO     40.49518939 +/-    0.0076
# Hcoef:  8.28

The following table shows the complete astrometric record for 19EG8. 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 (19EG8) followed by the observatory code and reference code for the source of the astrometry.

2016 03  04.34717  09 19 47.01   +04 40 56.6   23.9i 19EG8     T09  C~8Do3      
2016 03  04.36141  09 19 46.96   +04 40 57.1   24.2i 19EG8     T09  C~8Do3      
2016 03  04.37528  09 19 46.89   +04 40 57.5   24.1i 19EG8     T09  C~8Do3      
2016 03  04.39161  09 19 46.82   +04 40 57.8   24.0i 19EG8     T09  C~8Do3      
2016 03  12.31203  09 19 15.07   +04 44 19.4   23.8z 19EG8     T09  C~8Do3      
2016 03  12.32648  09 19 15.00   +04 44 19.8   24.1z 19EG8     T09  C~8Do3      
2016 03  12.34030  09 19 14.97   +04 44 20.1   24.3z 19EG8     T09  C~8Do3      
2016 03  12.38737  09 19 14.77   +04 44 21.4   24.3z 19EG8     T09  C~8Do3      
2018 11  15.56728  09 41 18.35   +02 45 24.7   23.9z 19EG8     T09  C~870Y      
2018 11  15.59104  09 41 18.35   +02 45 24.0   24.0z 19EG8     T09  C~870Y      
2018 11  15.59379  09 41 18.35   +02 45 24.0   23.7z 19EG8     T09  C~870Y      
2018 11  15.63220  09 41 18.40   +02 45 23.1   23.7z 19EG8     T09  C~870Y      
2019 01  06.45953  09 39 57.67   +02 38 18.9   25.6g 19EG8     T09  C~870Y      
2019 01  06.59969  09 39 57.17   +02 38 19.5   25.8g 19EG8     T09  C~870Y      
2019 01  06.61913  09 39 57.08   +02 38 20.2   25.9g 19EG8     T09  C~870Y      
2019 03  08.26245  09 35 26.99   +02 57 44.3   24.6r 19EG8     T09  C~870Y      
2019 03  08.29600  09 35 26.83   +02 57 44.9   24.6r 19EG8     T09  C~870Y      
2019 03  08.31497  09 35 26.75   +02 57 45.5   24.5r 19EG8     T09  C~870Y      
2019 03  08.31706  09 35 26.74   +02 57 45.6   24.3r 19EG8     T09  C~870Y      
2019 03  08.33820  09 35 26.66   +02 57 46.3   24.6r 19EG8     T09  C~870Y      

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    -0.00       0.00    -0.13
     2   0.0000     -0.87     0.11       0.24     0.05
     3   0.0001     -1.98    -0.05       0.30     0.05
     4   0.0001     -3.07    -0.02       0.26    -0.06
     5   0.0218   -516.80     0.04      45.09     0.02
     6   0.0218   -517.92    -0.17      45.15    -0.02
     7   0.0219   -518.44     0.18      45.29     0.04
     8   0.0220   -521.69    -0.09      45.60     0.06
     9   2.7001  20594.74     0.07    -542.31     0.15
    10   2.7002  20594.97    -0.12    -542.97    -0.10
    11   2.7002  20594.97    -0.17    -542.97    -0.05
    12   2.7003  20595.97     0.18    -543.59     0.00
    13   2.8422  19572.20    -0.07   -1330.84    -0.08
    14   2.8426  19564.83     0.29   -1332.64    -0.27
    15   2.8426  19563.32    -0.16   -1332.40     0.19
    16   3.0087  15325.73     0.10   -1498.88     0.22
    17   3.0088  15323.25    -0.04   -1499.06    -0.15
    18   3.0088  15321.92    -0.04   -1498.87    -0.06
    19   3.0088  15321.74    -0.07   -1498.82    -0.02
    20   3.0089  15320.38     0.04   -1498.53     0.16

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.

19EG8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.323    45.362    45.291
ecceobj         0.088     0.091     0.087
incobj         11.482    11.481    11.483
qmin           40.654    40.570    40.697
qmax           50.125    50.365    50.175
amean          45.306    45.348    45.271
amin           44.947    44.985    44.905
amax           45.699    45.735    45.669
emean           0.087     0.089     0.085
emin            0.074     0.077     0.074
emax            0.098     0.102     0.099
imean          13.092    13.094    13.089
imin           12.697    12.695    12.691
imax           13.468    13.468    13.466
excite_mean     0.243     0.243     0.242
fracstop        1.000     1.000     1.000
cjmean          3.045     3.045     3.045

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       186.9     186.8     187.4
kozaiamp        180.0     180.0     180.0