Orbit Fit and Astrometric record for 18VP137

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: 18VP137   
# Created Thu Apr  3 01:11:13 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   1.06y
# First observation: 2018/11/08
#  Last observation: 2019/11/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.011705   0.000000  -0.001773   0.016652   0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit:     1.78 DOF:     11 RMS:  0.08
# Min/Max residuals:    -0.17    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.077716E-05  1.169713E-02 -1.946022E-06 -1.766575E-03  1.669925E-02 -5.393909E-03
# Covariance matrix:
  7.4162E-13  2.1271E-12  1.2828E-14 -5.8148E-13  2.2529E-12  3.1528E-10
  2.1271E-12  1.3405E-09  1.3530E-11 -3.3073E-10  4.6699E-10  1.7926E-07
  1.2828E-14  1.3530E-11  4.6374E-13 -3.6727E-12  4.6750E-12  1.8106E-09
 -5.8148E-13 -3.3073E-10 -3.6727E-12  8.2415E-11 -1.1519E-10 -4.4252E-08
  2.2529E-12  4.6699E-10  4.6750E-12 -1.1519E-10  1.6752E-10  6.2436E-08
  3.1528E-10  1.7926E-07  1.8106E-09 -4.4252E-08  6.2436E-08  2.3985E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.326733   38.092156   -0.135191   -0.057162   -0.984983  2458430.817951
# Heliocentric elements and errors
Epoch:              2458430.5000  =  2018/11/08
Mean Anomaly:          283.60241 +/-    59.487
Argument of Peri:      324.41419 +/-    23.827
Long of Asc Node:      197.47735 +/-     0.105
Inclination:             9.17497 +/-     0.043
Eccentricity:         0.41768421 +/-    0.2677
Semi-Major Axis:     56.76035824 +/-   15.2777
Time of Perihelion: 2491577.4284 +/-   22069.2
Perihelion:          33.05245276 +/-   17.6060
Aphelion:            80.46826372 +/-   26.4563
Period (y)              427.6376 +/-    172.66
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           47.74264382 +/-    0.0365
Ecliptic Y           37.58947854 +/-    0.0286
Ecliptic Z           -3.47513666 +/-    0.0027
Ecliptic XDOT        -0.00188351 +/-    0.0006
Ecliptic YDOT         0.00095191 +/-    0.0005
Ecliptic ZDOT        -0.00023802 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   60.86382760 +/-    0.0336
Geocenter to KBO     59.88291809 +/-    0.0464
# Hcoef:  7.60

The following table shows the complete astrometric record for 18VP137. 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 (18VP137) followed by the observatory code and reference code for the source of the astrometry.

2018 11  08.31715  02 27 16.218  +11 03 16.71  25.1r 18VP137   568  C~4ZZR      
2018 11  08.47653  02 27 15.667  +11 03 13.74  25.2r 18VP137   568  C~4ZZR      
2018 12  10.08045  02 25 39.219  +10 55 28.67  25.4r 18VP137   304  C~4ZZR      
2018 12  10.13564  02 25 39.072  +10 55 28.11  25.4r 18VP137   304  C~4ZZR      
2018 12  11.11465  02 25 36.598  +10 55 17.13  25.4r 18VP137   304  C~4ZZR      
2019 11  29.11281  02 28 53.295  +11 04 53.27  25.5r 18VP137   304  C~4ZZR      
2019 11  29.20387  02 28 53.005  +11 04 51.80  25.4r 18VP137   304  C~4ZZR      
2019 11  30.11862  02 28 50.290  +11 04 39.30  25.4r 18VP137   304  C~4ZZR      

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     0.06       0.00     0.06
     2   0.0004     -8.64    -0.06      -0.23    -0.14
     3   0.0870  -1503.00     0.06      13.02    -0.04
     4   0.0871  -1505.23     0.03      13.18     0.05
     5   0.0898  -1543.27    -0.09      14.45     0.08
     6   1.0563   1385.49     0.06    -363.39     0.02
     7   1.0565   1380.97    -0.17    -363.43    -0.10
     8   1.0590   1339.10     0.11    -362.58     0.07

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.

18VP137    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0