Orbit Fit and Astrometric record for 18VN35

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: 18VN35    
# Created Sat Dec  4 02:14:03 2021
# Orbit generated from Bernstein formalism
# Fitting     11 observations of     11
# Arc:   1.13y
# First observation: 2018/11/10
#  Last observation: 2019/12/28
Preliminary a, adot, b, bdot, g, gdot:
  -0.000077   0.012760  -0.000003   0.005760   0.017310   0.000000
# Chi-squared of fit:     4.46 DOF:     16 RMS:  0.11
# Min/Max residuals:    -0.22    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.134806E-05  1.291525E-02  4.979777E-06  5.815798E-03  1.762200E-02  8.946592E-03
# Covariance matrix:
  6.2692E-13  4.4548E-13 -1.0220E-13  1.1224E-12  1.3018E-12  1.6280E-10
  4.4548E-13  2.9424E-12 -3.7772E-13  4.5062E-12  3.8057E-12  6.5622E-10
 -1.0220E-13 -3.7772E-13  3.2606E-13 -9.9892E-13 -5.9035E-13 -1.0634E-10
  1.1224E-12  4.5062E-12 -9.9892E-13  9.4125E-12  6.9363E-12  1.2908E-09
  1.3018E-12  3.8057E-12 -5.9035E-13  6.9363E-12  6.2475E-12  1.0094E-09
  1.6280E-10  6.5622E-10 -1.0634E-10  1.2908E-09  1.0094E-09  1.8812E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.598058   73.056632    0.421234   -0.134753   -0.891912  2458432.946721
# Heliocentric elements and errors
Epoch:              2458430.5000  =  2018/11/08
Mean Anomaly:           29.26210 +/-     2.429
Argument of Peri:      244.51199 +/-     0.294
Long of Asc Node:       90.86565 +/-     0.002
Inclination:            25.43606 +/-     0.003
Eccentricity:         0.59319229 +/-    0.0287
Semi-Major Axis:     83.91859751 +/-    4.4264
Time of Perihelion: 2435606.6579 +/-     572.5
Perihelion:          34.13873230 +/-    3.0078
Aphelion:           133.69846272 +/-    7.4523
Period (y)              768.7684 +/-     60.82
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           17.01736652 +/-    0.0023
Ecliptic Y           54.40700824 +/-    0.0076
Ecliptic Z           -8.48357735 +/-    0.0012
Ecliptic XDOT        -0.00147194 +/-    0.0000
Ecliptic YDOT         0.00202635 +/-    0.0001
Ecliptic ZDOT         0.00068542 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   57.63405585 +/-    0.0072
Geocenter to KBO     56.74726254 +/-    0.0080
# Hcoef:  7.56

The following table shows the complete astrometric record for 18VN35. 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 (18VN35) followed by the observatory code and reference code for the source of the astrometry.

2018 11  10.44592  04 50 56.908  +13 49 53.82  25.1r 18VN35    568  C~2ygZ      
2018 11  10.61751  04 50 56.305  +13 49 52.67        18VN35    568  C~2ygZ      
2018 12  10.15854  04 49 06.138  +13 47 29.25        18VN35    304  C~2ygZ      
2018 12  10.20293  04 49 05.931  +13 47 29.23        18VN35    304  C~2ygZ      
2018 12  12.20516  04 48 58.245  +13 47 24.10  25.2r 18VN35    304  C~2ygZ      
2019 03  01.03327  04 45 59.963  +13 54 34.17  25.1r 18VN35    304  C~4ZZD      
2019 03  02.03475  04 46 00.174  +13 54 46.83  25.1r 18VN35    304  C~4ZZD      
2019 12  27.13671  04 50 54.610  +14 12 08.69        18VN35    304  C~4ZZD      
2019 12  27.18886  04 50 54.406  +14 12 08.75        18VN35    304  C~4ZZD      
2019 12  28.11862  04 50 51.138  +14 12 09.35        18VN35    304  C~4ZZD      
2019 12  28.15221  04 50 51.023  +14 12 09.20        18VN35    304  C~4ZZD      

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     0.05       0.00     0.05
     2   0.0005     -8.86    -0.04      -0.09     0.05
     3   0.0813  -1619.21     0.31      50.65    -0.10
     4   0.0815  -1622.21    -0.16      51.00     0.06
     5   0.0870  -1733.98    -0.16      59.49    -0.06
     6   0.3028  -4258.45     0.05     805.73     0.02
     7   0.3055  -4253.82    -0.05     817.91    -0.04
     8   1.1271    126.19    -0.00    1329.33    -0.05
     9   1.1273    123.25    -0.22    1329.75     0.02
    10   1.1298     76.14     0.08    1336.02     0.11
    11   1.1299     74.46     0.14    1336.07    -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.

18VN35    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        86.122   102.387    75.520
ecceobj         0.600     0.678     0.521
incobj         25.320    25.320    25.321
qmin           32.476    31.670    34.961
qmax          139.119   174.079   116.952
amean          84.073    99.569    74.664
amin           81.549    97.073    73.533
amax           86.737   103.337    76.315
emean           0.594     0.657     0.514
emin            0.581     0.640     0.497
emax            0.611     0.685     0.533
imean          23.523    25.707    24.090
imin           22.134    23.221    23.234
imax           24.630    26.950    25.048
excite_mean     0.716     0.788     0.656
fracstop        1.000     1.000     1.000
cjmean          2.823     2.771     2.870

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       193.6     165.8     180.0
kozaiamp        180.0     180.0     180.0