Orbit Fit and Astrometric record for 18VO137

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: 18VO137   
# Created Mon Dec  6 02:14:02 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:   1.06y
# First observation: 2018/11/08
#  Last observation: 2019/12/01
Preliminary a, adot, b, bdot, g, gdot:
  -0.000031   0.009273  -0.000005   0.007483   0.016066   0.000000
# Chi-squared of fit:     1.45 DOF:     12 RMS:  0.07
# Min/Max residuals:    -0.18    0.13
# Exact a, adot, b, bdot, g, gdot:
  8.743677E-06  9.305550E-03  7.226789E-06  7.482053E-03  1.624981E-02 -1.672226E-03
# Covariance matrix:
  6.8064E-13  3.6737E-13 -9.0645E-14  1.0677E-12  1.4764E-12  1.2547E-10
  3.6737E-13  9.7201E-12 -1.0592E-12  1.5324E-11  6.6635E-12  1.8070E-09
 -9.0645E-14 -1.0592E-12  3.8022E-13 -2.1424E-12 -8.3468E-13 -2.1835E-10
  1.0677E-12  1.5324E-11 -2.1424E-12  2.7810E-11  1.1449E-11  3.1654E-09
  1.4764E-12  6.6635E-12 -8.3468E-13  1.1449E-11  7.5806E-12  1.3489E-09
  1.2547E-10  1.8070E-09 -2.1835E-10  3.1654E-09  1.3489E-09  3.7328E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.826986   37.945074   -0.137723   -0.065736   -0.984097  2458430.817951
# Heliocentric elements and errors
Epoch:              2458430.5000  =  2018/11/08
Mean Anomaly:          232.72067 +/-    11.096
Argument of Peri:      136.15141 +/-    10.444
Long of Asc Node:       42.71670 +/-     0.002
Inclination:            39.07803 +/-     0.013
Eccentricity:         0.18830292 +/-    0.0270
Semi-Major Axis:     55.18218980 +/-    0.5734
Time of Perihelion: 2511366.6315 +/-    4540.7
Perihelion:          44.79122249 +/-    1.5608
Aphelion:            65.57315712 +/-    1.6383
Period (y)              409.9271 +/-      6.39
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           49.11476161 +/-    0.0082
Ecliptic Y           38.46463774 +/-    0.0064
Ecliptic Z           -4.10694362 +/-    0.0007
Ecliptic XDOT        -0.00111177 +/-    0.0001
Ecliptic YDOT         0.00111290 +/-    0.0001
Ecliptic ZDOT         0.00127642 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   62.51923824 +/-    0.0076
Geocenter to KBO     61.53918822 +/-    0.0104
# Hcoef:  7.22

The following table shows the complete astrometric record for 18VO137. 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 (18VO137) followed by the observatory code and reference code for the source of the astrometry.

2018 11  08.31715  02 27 21.218  +10 32 01.31  24.9r 18VO137   568  C~4ZZR      
2018 11  08.47653  02 27 20.649  +10 31 59.46  24.8r 18VO137   568  C~4ZZR      
2018 12  09.08898  02 25 43.692  +10 27 03.20  25.1r 18VO137   304  C~4ZZR      
2018 12  09.15092  02 25 43.514  +10 27 02.82  25.2r 18VO137   304  C~4ZZR      
2018 12  10.08937  02 25 40.998  +10 26 56.72  25.3r 18VO137   304  C~4ZZR      
2018 12  12.14328  02 25 35.639  +10 26 44.69  25.0r 18VO137   304  C~4ZZR      
2019 02  03.04593  02 24 37.200  +10 28 55.04  25.4r 18VO137   304  C~4ZZR      
2019 11  30.19270  02 27 39.389  +11 02 45.19  25.2r 18VO137   304  C~4ZZR      
2019 12  01.18651  02 27 36.374  +11 02 36.61  25.1r 18VO137   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     0.01
     2   0.0004     -8.54    -0.01       0.92     0.13
     3   0.0842  -1458.27     0.08     177.37    -0.03
     4   0.0844  -1460.88    -0.02     177.85     0.03
     5   0.0870  -1498.00    -0.18     183.96    -0.10
     6   0.0926  -1576.74     0.01     197.89    -0.02
     7   0.2375  -2351.47     0.06     597.87    -0.04
     8   1.0592    841.89    -0.08    1662.23    -0.03
     9   1.0619    797.08     0.07    1668.25     0.05

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.

18VO137    quality flag:1

Type:         5:2EEE  SCATNEAR  SCATEXTD

axisobj        55.730    58.399    54.962
ecceobj         0.181     0.280     0.137
incobj         38.802    38.760    38.837
qmin           34.982    40.638    45.648
qmax           77.105    76.213    64.205
amean          55.461    58.077    54.675
amin           54.803    57.489    54.192
amax           56.311    58.774    55.231
emean           0.297     0.277     0.148
emin            0.181     0.262     0.137
emax            0.370     0.297     0.162
imean          35.972    38.373    38.256
imin           34.172    37.990    38.047
imax           38.442    38.761    38.483
excite_mean     0.660     0.680     0.637
fracstop        1.000     1.000     1.000
cjmean          2.637     2.611     2.644

libcent 0       193.5    -180.0    -180.0
libamp  0       135.3    -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        97.3     227.2     199.1
kozaiamp         49.2     180.0     180.0