Orbit Fit and Astrometric record for 19EV8

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: 19EV8     
# Created Tue Apr  1 01:11:12 2025
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   1.05y
# First observation: 2018/03/18
#  Last observation: 2019/04/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000034   0.021069  -0.000001   0.000278   0.022267   0.000000
# Chi-squared of fit:     9.33 DOF:     32 RMS:  0.12
# Min/Max residuals:    -0.27    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.423033E-05  2.108793E-02 -2.821386E-07  2.780485E-04  2.244441E-02  8.506799E-04
# Covariance matrix:
  4.8024E-13  8.4519E-13  7.2324E-15  7.4374E-15  1.0291E-12  6.3767E-11
  8.4519E-13  8.9009E-12  2.8597E-14  5.1963E-14  4.8105E-12  4.2397E-10
  7.2324E-15  2.8597E-14  1.9180E-13 -2.1347E-13  2.6251E-14  1.6829E-12
  7.4374E-15  5.1963E-14 -2.1347E-13  4.0154E-13  3.2053E-14  2.6593E-12
  1.0291E-12  4.8105E-12  2.6251E-14  3.2053E-14  3.9015E-12  2.6999E-10
  6.3767E-11  4.2397E-10  1.6829E-12  2.6593E-12  2.6999E-10  2.1914E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.833731  178.194331    0.017261    0.066560   -0.991972  2458195.987663
# Heliocentric elements and errors
Epoch:              2458190.5000  =  2018/03/13
Mean Anomaly:           55.67629 +/-     3.834
Argument of Peri:       18.48110 +/-     4.606
Long of Asc Node:       99.71218 +/-     0.026
Inclination:             3.82704 +/-     0.000
Eccentricity:         0.04426047 +/-    0.0062
Semi-Major Axis:     46.64663180 +/-    0.0254
Time of Perihelion: 2440193.6447 +/-    1239.2
Perihelion:          44.58203015 +/-    0.2910
Aphelion:            48.71123346 +/-    0.2912
Period (y)              318.5948 +/-      0.26
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -45.42726746 +/-    0.0039
Ecliptic Y            1.44220916 +/-    0.0001
Ecliptic Z            2.97898324 +/-    0.0003
Ecliptic XDOT        -0.00017591 +/-    0.0000
Ecliptic YDOT        -0.00257240 +/-    0.0000
Ecliptic ZDOT         0.00004063 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.54767763 +/-    0.0039
Geocenter to KBO     44.55452191 +/-    0.0039
# Hcoef:  7.62

The following table shows the complete astrometric record for 19EV8. 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 (19EV8) followed by the observatory code and reference code for the source of the astrometry.

2018 03  18.486862 11 59 28.99   +04 14 06.5         19EV8     T09  C~8Aix      
2018 03  18.557320 11 59 28.69   +04 14 08.5         19EV8     T09  C~8Aix      
2018 03  18.59740  11 59 28.49   +04 14 09.4   24.3i 19EV8     T09  C~8CPR      
2018 04  24.379218 11 57 05.57   +04 28 44.2         19EV8     T09  C~8Aix      
2018 04  24.38261  11 57 05.56   +04 28 44.2   24.3z 19EV8     T09  C~8CPR      
2018 04  24.42024  11 57 05.42   +04 28 44.7   24.0z 19EV8     T09  C~8CPR      
2018 04  24.45326  11 57 05.31   +04 28 45.5   24.4z 19EV8     T09  C~8CPR      
2018 04  24.504079 11 57 05.15   +04 28 46.3         19EV8     T09  C~8Aix      
2018 05  13.056389 11 56 13.771  +04 33 09.94  23.3g 19EV8     W84  C~8HR7      
2019 02  05.55162  12 06 26.08   +03 28 13.1   23.3i 19EV8     T09  C~8Aix      
2019 02  05.59538  12 06 25.95   +03 28 13.8   24.4i 19EV8     T09  C~8Aix      
2019 02  05.59805  12 06 25.95   +03 28 13.9   24.0i 19EV8     T09  C~8Aix      
2019 02  05.63843  12 06 25.83   +03 28 14.9   23.9i 19EV8     T09  C~8Aix      
2019 03  03.51493  12 04 58.79   +03 39 02.5   24.3z 19EV8     T09  C~8Aix      
2019 03  03.53922  12 04 58.70   +03 39 03.3   24.4z 19EV8     T09  C~8Aix      
2019 03  03.57949  12 04 58.55   +03 39 04.2   24.1z 19EV8     T09  C~8Aix      
2019 03  03.63045  12 04 58.35   +03 39 05.7   23.9z 19EV8     T09  C~8Aix      
2019 04  04.440820 12 02 48.17   +03 53 23.5         19EV8     T09  C~8Aix      
2019 04  04.467836 12 02 48.05   +03 53 24.1         19EV8     T09  C~8Aix      

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     0.13       0.00     0.10
     2   0.0002     -4.91     0.08       0.05     0.15
     3   0.0003     -8.02    -0.27      -0.32    -0.21
     4   0.1010  -2317.27     0.05     -49.33     0.10
     5   0.1010  -2317.41     0.09     -49.39     0.05
     6   0.1011  -2319.53    -0.02     -49.77    -0.20
     7   0.1012  -2321.36    -0.10     -49.69    -0.01
     8   0.1013  -2323.87     0.08     -49.91    -0.07
     9   0.1521  -3133.78    -0.04    -113.66     0.01
    10   0.8872   6824.87     0.08     -29.40     0.26
    11   0.8874   6822.81     0.06     -29.54    -0.02
    12   0.8874   6822.77     0.14     -29.45     0.06
    13   0.8875   6820.72    -0.03     -29.25     0.12
    14   0.9583   5366.09    -0.22      42.51    -0.07
    15   0.9584   5364.53    -0.18      42.70     0.10
    16   0.9585   5362.11     0.03      42.63    -0.03
    17   0.9586   5358.76     0.01      42.81     0.08
    18   1.0457   3228.90     0.11      49.84    -0.15
    19   1.0458   3227.01     0.01      49.67    -0.27

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.

19EV8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.315    46.442    46.217
ecceobj         0.045     0.063     0.028
incobj          3.824     3.825     3.824
qmin           43.494    42.800    44.163
qmax           49.718    50.603    48.809
amean          46.495    46.597    46.401
amin           46.119    46.205    46.030
amax           46.883    47.008    46.770
emean           0.048     0.065     0.031
emin            0.036     0.053     0.019
emax            0.061     0.077     0.044
imean           2.215     2.220     2.207
imin            1.868     1.866     1.865
imax            2.535     2.547     2.523
excite_mean     0.062     0.076     0.050
fracstop        1.000     1.000     1.000
cjmean          3.128     3.127     3.128

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       171.2     170.2     174.3
kozaiamp        179.9     180.0     179.9