Orbit Fit and Astrometric record for 19ER7

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: 19ER7     
# Created Thu Oct 31 01:10:39 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     23 observations of     23
# Arc:   5.93y
# First observation: 2013/04/01
#  Last observation: 2019/03/08
# Chi-squared of fit:     9.34 DOF:     40 RMS:  0.11
# Min/Max residuals:    -0.21    0.38
# Exact a, adot, b, bdot, g, gdot:
  1.388447E-05  2.371628E-02 -8.865170E-06 -1.558310E-02  2.732421E-02  1.082966E-03
# Covariance matrix:
  1.3507E-12 -4.6756E-13 -1.8272E-13  1.7326E-13 -2.5797E-13 -1.6609E-12
 -4.6756E-13  2.7759E-13  1.6193E-13 -1.5355E-13  2.4190E-13  1.4719E-12
 -1.8272E-13  1.6193E-13  1.1573E-12 -3.0434E-13  1.8293E-13  1.0100E-12
  1.7326E-13 -1.5355E-13 -3.0434E-13  1.4018E-13 -1.7327E-13 -9.5763E-13
 -2.5797E-13  2.4190E-13  1.8293E-13 -1.7327E-13  7.5794E-13  1.6620E-12
 -1.6609E-12  1.4719E-12  1.0100E-12 -9.5763E-13  1.6620E-12  9.1800E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    6.591021  167.790237   -0.403276    0.105168   -0.909608  2456383.687295
# Heliocentric elements and errors
Epoch:              2456384.5000  =  2013/04/02
Mean Anomaly:           58.83864 +/-     0.079
Argument of Peri:      103.73341 +/-     0.095
Long of Asc Node:      358.05041 +/-     0.000
Inclination:            33.92926 +/-     0.000
Eccentricity:         0.05761807 +/-    0.0001
Semi-Major Axis:     38.56117830 +/-    0.0042
Time of Perihelion: 2442089.5057 +/-      19.4
Perihelion:          36.33935752 +/-    0.0054
Aphelion:            40.78299908 +/-    0.0058
Period (y)              239.4604 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.51298807 +/-    0.0011
Ecliptic Y            7.49046251 +/-    0.0002
Ecliptic Z            4.20038909 +/-    0.0001
Ecliptic XDOT        -0.00078939 +/-    0.0000
Ecliptic YDOT        -0.00226145 +/-    0.0000
Ecliptic ZDOT        -0.00153849 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.50928300 +/-    0.0011
Geocenter to KBO     36.59758852 +/-    0.0012
# Hcoef:  6.92

The following table shows the complete astrometric record for 19ER7. 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 (19ER7) followed by the observatory code and reference code for the source of the astrometry.

2013 04  01.186517 11 25 32.376  +10 53 14.82  22.6z 19ER7     W84  C~8HR7      
2017 03  02.226416 11 42 31.040  +05 15 21.38  22.6r 19ER7     W84  C~83GA      
2017 03  02.227611 11 42 31.028  +05 15 21.45  22.8g 19ER7     W84  C~83GA      
2017 03  06.209433 11 42 10.054  +05 17 03.02  22.7g 19ER7     W84  C~83GA      
2017 03  31.145707 11 39 57.050  +05 27 13.68  22.5r 19ER7     W84  C~83GA      
2018 03  18.47675  11 44 35.87   +04 00 53.7   22.5i 19ER7     T09  C~83GA      
2018 03  18.50571  11 44 35.69   +04 00 54.4   22.5i 19ER7     T09  C~83GA      
2018 03  18.57871  11 44 35.29   +04 00 56.2   22.5i 19ER7     T09  C~83GA      
2018 03  19.217669 11 44 31.867  +04 01 12.28  22.4r 19ER7     W84  C~83GA      
2018 04  24.36908  11 41 35.13   +04 13 41.0   22.3z 19ER7     T09  C~83GA      
2018 04  24.41221  11 41 34.95   +04 13 41.5   22.5z 19ER7     T09  C~83GA      
2018 04  24.44523  11 41 34.81   +04 13 42.0   22.3z 19ER7     T09  C~83GA      
2018 04  24.49606  11 41 34.62   +04 13 42.8   22.6z 19ER7     T09  C~83GA      
2018 05  13.049680 11 40 32.342  +04 16 38.56  22.8r 19ER7     W84  C~83GA      
2018 05  16.989497 11 40 22.665  +04 16 51.74  23.6g 19ER7     W84  C~83GA      
2019 03  02.41395  11 49 30.77   +02 33 03.6   22.2y 19ER7     T09  C~83GA      
2019 03  02.51880  11 49 30.23   +02 33 06.2   22.9y 19ER7     T09  C~83GA      
2019 03  02.55921  11 49 30.02   +02 33 07.2   22.7y 19ER7     T09  C~83GA      
2019 03  02.60017  11 49 29.80   +02 33 08.1   22.3y 19ER7     T09  C~83GA      
2019 03  08.36022  11 48 59.80   +02 35 30.7   22.4r 19ER7     T09  C~83GA      
2019 03  08.39173  11 48 59.64   +02 35 31.6   22.5r 19ER7     T09  C~83GA      
2019 03  08.40431  11 48 59.58   +02 35 31.7   22.5r 19ER7     T09  C~83GA      
2019 03  08.43394  11 48 59.40   +02 35 32.6   22.5r 19ER7     T09  C~83GA      

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    -0.04       0.00    -0.02
     2   3.9180      0.00    -0.01       0.00    -0.07
     3   3.9180      0.00    -0.09       0.00    -0.03
     4   3.9289      0.00    -0.06       0.00    -0.07
     5   3.9972      0.00     0.09       0.00    -0.02
     6   4.9618      0.00     0.38       0.00     0.13
     7   4.9619      0.00     0.05       0.00     0.10
     8   4.9621      0.00     0.02       0.00     0.08
     9   4.9638      0.00     0.02       0.00    -0.03
    10   5.0628      0.00    -0.11       0.00     0.17
    11   5.0629      0.00    -0.14       0.00     0.06
    12   5.0630      0.00    -0.21       0.00     0.09
    13   5.0631      0.00     0.06       0.00     0.18
    14   5.1139      0.00     0.19       0.00    -0.16
    15   5.1247      0.00     0.05       0.00    -0.08
    16   5.9171      0.00    -0.10       0.00    -0.04
    17   5.9174      0.00     0.01       0.00     0.01
    18   5.9175      0.00     0.03       0.00     0.02
    19   5.9176      0.00    -0.07       0.00    -0.08
    20   5.9334      0.00    -0.11       0.00    -0.07
    21   5.9335      0.00     0.02       0.00     0.04
    22   5.9335      0.00     0.13       0.00    -0.17
    23   5.9336      0.00    -0.18       0.00    -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.

19ER7    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        38.465    38.480    38.450
ecceobj         0.056     0.057     0.055
incobj         33.994    33.994    33.994
qmin           35.933    35.909    35.945
qmax           41.259    41.333    41.187
amean          38.516    38.531    38.456
amin           38.235    38.261    38.169
amax           38.812    38.817    38.785
emean           0.051     0.053     0.046
emin            0.038     0.041     0.030
emax            0.064     0.065     0.062
imean          34.284    34.282    34.293
imin           33.950    33.938    33.913
imax           34.625    34.638    34.676
excite_mean     0.566     0.566     0.565
fracstop        1.000     1.000     1.000
cjmean          2.649     2.648     2.649

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       176.6     177.8     179.7
kozaiamp        180.0     179.9     180.0