Orbit Fit and Astrometric record for 18VM35

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: 18VM35    
# Created Wed Dec  8 02:14:07 2021
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   1.14y
# First observation: 2018/11/06
#  Last observation: 2019/12/28
Preliminary a, adot, b, bdot, g, gdot:
  -0.000018   0.018938   0.000001  -0.001041   0.018223   0.000000
# Chi-squared of fit:     5.83 DOF:     20 RMS:  0.12
# Min/Max residuals:    -0.19    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.669356E-05  1.884039E-02 -1.934043E-07 -1.022164E-03  1.827724E-02 -8.330787E-03
# Covariance matrix:
  4.3707E-13  4.3228E-13  4.3559E-15 -7.1336E-14  6.1874E-13  5.0596E-11
  4.3228E-13  7.6458E-12  9.0302E-14 -8.5808E-13  4.2170E-12  5.5922E-10
  4.3559E-15  9.0302E-14  2.1896E-13 -2.4923E-13  4.7684E-14  7.1615E-12
 -7.1336E-14 -8.5808E-13 -2.4923E-13  6.4191E-13 -4.9550E-13 -6.7640E-11
  6.1874E-13  4.2170E-12  4.7684E-14 -4.9550E-13  2.8147E-12  3.2873E-10
  5.0596E-11  5.5922E-10  7.1615E-12 -6.7640E-11  3.2873E-10  4.4025E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -7.989004   81.110934    0.598510   -0.110560   -0.788540  2458429.099361
# Heliocentric elements and errors
Epoch:              2458420.5000  =  2018/10/29
Mean Anomaly:          356.52648 +/-     0.354
Argument of Peri:      302.97113 +/-     0.695
Long of Asc Node:      192.50649 +/-     0.017
Inclination:             8.48634 +/-     0.001
Eccentricity:         0.82402805 +/-    0.0133
Semi-Major Axis:    255.08505765 +/-   17.3267
Time of Perihelion: 2472778.4706 +/-      45.2
Perihelion:          44.88781431 +/-    4.5549
Aphelion:           465.28230099 +/-   31.7849
Period (y)             4074.1380 +/-    415.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            9.08606634 +/-    0.0008
Ecliptic Y           54.21813820 +/-    0.0049
Ecliptic Z           -7.60420854 +/-    0.0007
Ecliptic XDOT        -0.00297491 +/-    0.0000
Ecliptic YDOT        -0.00080829 +/-    0.0000
Ecliptic ZDOT         0.00002162 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   55.49763147 +/-    0.0048
Geocenter to KBO     54.71285860 +/-    0.0050
# Hcoef:  7.65

The following table shows the complete astrometric record for 18VM35. 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 (18VM35) followed by the observatory code and reference code for the source of the astrometry.

2018 11  06.59856  05 23 30.592  +15 10 09.25  25.0r 18VM35    568  C~2ygZ      
2018 11  07.63604  05 23 27.595  +15 10 00.66        18VM35    568  C~2ygZ      
2018 11  08.59628  05 23 24.763  +15 09 52.40        18VM35    568  C~2ygZ      
2018 12  09.26032  05 21 37.650  +15 06 22.59        18VM35    304  C~2ygZ      
2018 12  10.25364  05 21 33.856  +15 06 17.70  25.0r 18VM35    304  C~2ygZ      
2019 02  02.11690  05 18 38.339  +15 06 09.57  25.1r 18VM35    304  C~2ygZ      
2019 02  03.09285  05 18 36.344  +15 06 14.03  25.1r 18VM35    304  C~2ygZ      
2019 02  28.04314  05 18 07.666  +15 08 53.08  25.0r 18VM35    304  C~3d16      
2019 03  01.04116  05 18 07.482  +15 09 01.30  25.1r 18VM35    304  C~3d16      
2019 11  29.24687  05 26 46.782  +15 07 50.43  24.9r 18VM35    304  C~3d16      
2019 11  30.23062  05 26 43.168  +15 07 44.93  25.0r 18VM35    304  C~3d16      
2019 12  28.13858  05 24 56.970  +15 05 58.05        18VM35    304  C~3qUU      
2019 12  28.18194  05 24 56.813  +15 05 57.71        18VM35    304  C~3qUU      

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    -0.08       0.00    -0.14
     2   0.0028    -43.85     0.10      -5.81     0.19
     3   0.0055    -85.29     0.01     -11.44     0.12
     4   0.0894  -1646.62     0.00    -120.29     0.04
     5   0.0921  -1701.77    -0.08    -121.55    -0.10
     6   0.2396  -4238.88     0.10      42.08    -0.10
     7   0.2423  -4267.41     0.14      48.53    -0.06
     8   0.3106  -4670.80    -0.19     236.11    -0.11
     9   0.3133  -4672.88    -0.02     244.50     0.13
    10   1.0613   2826.73    -0.13    -314.19    -0.17
    11   1.0640   2774.16     0.09    -316.54     0.22
    12   1.1404   1232.48    -0.02    -329.33     0.13
    13   1.1405   1230.19     0.07    -329.53    -0.15

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.

18VM35    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       270.874   340.440   227.726
ecceobj         0.833     0.870     0.797
incobj          8.459     8.458     8.461
qmin           42.376    40.850    44.112
qmax          515.834   674.534   424.435
amean         262.015   328.168   223.041
amin          251.604   311.747   217.396
amax          280.415   359.309   235.197
emean           0.828     0.865     0.792
emin            0.818     0.855     0.782
emax            0.840     0.877     0.805
imean           8.489     8.556     8.566
imin            8.333     8.345     8.376
imax            8.659     8.779     8.883
excite_mean     0.841     0.878     0.806
fracstop        1.000     1.000     1.000
cjmean          3.386     3.362     3.423

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       311.6     314.8     317.2
kozaiamp         10.2      10.0      18.6