Orbit Fit and Astrometric record for 19EM8

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: 19EM8     
# Created Tue Apr  1 01:11:12 2025
# Orbit generated from Bernstein formalism
# Fitting     11 observations of     11
# Arc: 112.78d
# First observation: 2018/11/15
#  Last observation: 2019/03/08
Preliminary a, adot, b, bdot, g, gdot:
   0.000002   0.021701   0.000009  -0.000248   0.023179   0.000000
# Chi-squared of fit:     5.88 DOF:     16 RMS:  0.13
# Min/Max residuals:    -0.22    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.467347E-05  2.094411E-02  2.737406E-07 -2.685465E-04  2.259964E-02 -9.746322E-04
# Covariance matrix:
  4.8488E-13 -3.9252E-12  3.8482E-15 -3.9257E-13 -2.5793E-14  9.1674E-11
 -3.9252E-12  4.8343E-10  7.1329E-12  3.4384E-11  2.1227E-10  1.9210E-08
  3.8482E-15  7.1329E-12  4.8939E-13 -9.9546E-13  3.6154E-12  3.6397E-10
 -3.9257E-13  3.4384E-11 -9.9546E-13  1.1554E-11  1.3188E-11  1.0052E-09
 -2.5793E-14  2.1227E-10  3.6154E-12  1.3188E-11  1.0615E-10  1.0576E-08
  9.1674E-11  1.9210E-08  3.6397E-10  1.0052E-09  1.0576E-08  1.1285E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
  -10.061332  146.300551    0.993252    0.009670    0.053896  2458438.058881
# Heliocentric elements and errors
Epoch:              2458430.5000  =  2018/11/08
Mean Anomaly:          246.41596 +/-    16.931
Argument of Peri:       26.09842 +/-    16.559
Long of Asc Node:      240.69411 +/-     0.059
Inclination:            10.12112 +/-     0.001
Eccentricity:         0.08096178 +/-    0.0427
Semi-Major Axis:     42.59987279 +/-    0.2033
Time of Perihelion: 2490472.9473 +/-    4770.8
Perihelion:          39.15091135 +/-    1.8277
Aphelion:            46.04883423 +/-    1.8313
Period (y)              278.0486 +/-      1.99
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.65012855 +/-    0.0165
Ecliptic Y           24.96121080 +/-    0.0110
Ecliptic Z           -7.73033782 +/-    0.0035
Ecliptic XDOT        -0.00129866 +/-    0.0001
Ecliptic YDOT        -0.00218090 +/-    0.0001
Ecliptic ZDOT        -0.00001160 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.20126506 +/-    0.0147
Geocenter to KBO     44.24848534 +/-    0.0202
# Hcoef:  8.18

The following table shows the complete astrometric record for 19EM8. 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 (19EM8) followed by the observatory code and reference code for the source of the astrometry.

2018 11  15.55808  09 40 32.37   +03 16 07.8   23.8z 19EM8     T09  C~870Y      
2018 11  15.60564  09 40 32.40   +03 16 07.0   23.9z 19EM8     T09  C~870Y      
2018 11  15.63220  09 40 32.42   +03 16 06.6   23.8z 19EM8     T09  C~870Y      
2019 01  06.49177  09 39 13.26   +03 11 07.6   25.7g 19EM8     T09  C~870Y      
2019 01  06.57641  09 39 13.00   +03 11 08.3   25.3g 19EM8     T09  C~870Y      
2019 01  06.59969  09 39 12.90   +03 11 08.4   25.7g 19EM8     T09  C~870Y      
2019 01  06.61913  09 39 12.82   +03 11 08.8   26.2g 19EM8     T09  C~870Y      
2019 03  08.27291  09 34 56.95   +03 30 38.2   24.6r 19EM8     T09  C~870Y      
2019 03  08.27500  09 34 56.95   +03 30 38.2   24.5r 19EM8     T09  C~870Y      
2019 03  08.29600  09 34 56.88   +03 30 38.5   24.4r 19EM8     T09  C~870Y      
2019 03  08.33820  09 34 56.69   +03 30 39.7   24.3r 19EM8     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    -0.10
     2   0.0001      0.69    -0.01      -0.61    -0.01
     3   0.0002      1.10     0.02      -0.88     0.10
     4   0.1422  -1018.40    -0.22    -675.79    -0.14
     5   0.1424  -1022.31     0.31    -676.42     0.10
     6   0.1425  -1023.75     0.08    -676.82    -0.07
     7   0.1425  -1025.02    -0.17    -676.84     0.11
     8   0.3086  -5028.68    -0.18    -840.22     0.09
     9   0.3086  -5028.68    -0.04    -840.22     0.08
    10   0.3087  -5029.77     0.26    -840.29    -0.08
    11   0.3088  -5032.85    -0.04    -840.09    -0.08

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.

19EM8    quality flag:2

Type:      CLASSICAL    7:4EEE CLASSICAL

axisobj        42.661    43.537    42.555
ecceobj         0.075     0.197     0.066
incobj         10.102    10.103    10.103
qmin           38.598    34.050    38.763
qmax           47.021    54.054    46.553
amean          42.675    43.726    42.559
amin           42.340    43.227    42.222
amax           43.026    44.294    42.923
emean           0.077     0.197     0.069
emin            0.062     0.172     0.052
emax            0.093     0.222     0.086
imean          11.702    12.197    11.742
imin           10.933    11.234    10.976
imax           12.429    13.309    12.461
excite_mean     0.217     0.289     0.215
fracstop        1.000     1.000     1.000
cjmean          3.030     2.998     3.030

libcent 0      -180.0     177.8    -180.0
libamp  0      -180.0     132.3    -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       177.2     174.1     175.4
kozaiamp        179.9     179.9     180.0