Orbit Fit and Astrometric record for 16TW94

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: 16TW94    
# Created Sat Dec  4 02:13:58 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of     11
# Arc:   3.20y
# First observation: 2014/10/29
#  Last observation: 2018/01/09
Preliminary a, adot, b, bdot, g, gdot:
   0.000122   0.023769  -0.000008  -0.002327   0.024640   0.000000
# Chi-squared of fit:     3.87 DOF:     12 RMS:  0.12
# Min/Max residuals:    -0.22    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.431180E-05  2.404165E-02 -8.190792E-07 -2.296486E-03  2.452843E-02  1.507739E-03
# Covariance matrix:
  4.8318E-13 -2.3776E-13 -1.6609E-16 -3.9608E-15  3.5822E-14 -7.4762E-13
 -2.3776E-13  1.9450E-12 -7.0419E-14 -5.2753E-14  1.0453E-12  3.4805E-11
 -1.6609E-16 -7.0419E-14  4.7942E-13 -2.0352E-13 -5.2551E-14 -1.3235E-12
 -3.9608E-15 -5.2753E-14 -2.0352E-13  1.4290E-13 -7.2269E-14 -9.0075E-13
  3.5822E-14  1.0453E-12 -5.2551E-14 -7.2269E-14  1.0662E-12  1.8858E-11
 -7.4762E-13  3.4805E-11 -1.3235E-12 -9.0075E-13  1.8858E-11  6.7377E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -29.075033   32.685103   -0.048416   -0.482690   -0.868501  2456959.831218
# Heliocentric elements and errors
Epoch:              2456950.5000  =  2014/10/20
Mean Anomaly:           63.82775 +/-     0.196
Argument of Peri:      189.08333 +/-     0.306
Long of Asc Node:      134.25615 +/-     0.002
Inclination:            28.89986 +/-     0.000
Eccentricity:         0.06543034 +/-    0.0010
Semi-Major Axis:     42.71664793 +/-    0.0075
Time of Perihelion: 2438870.3836 +/-      55.3
Perihelion:          39.92168320 +/-    0.0451
Aphelion:            45.51161265 +/-    0.0453
Period (y)              279.1926 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.79650646 +/-    0.0013
Ecliptic Y           19.82074703 +/-    0.0008
Ecliptic Z          -19.81197818 +/-    0.0008
Ecliptic XDOT        -0.00143462 +/-    0.0000
Ecliptic YDOT         0.00226591 +/-    0.0000
Ecliptic ZDOT        -0.00030571 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.63893973 +/-    0.0011
Geocenter to KBO     40.76901815 +/-    0.0017
# Hcoef:  7.45

The following table shows the complete astrometric record for 16TW94. 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 (16TW94) followed by the observatory code and reference code for the source of the astrometry.

2014 10  29.33044  02 41 39.142  -14 57 29.81  23.8r 16TW94    W84  C~55aG      
2014 11  03.31203  02 41 14.999  -14 59 20.81  23.3r 16TW94    W84  C~55aG      
2014 12  16.19628  02 38 07.541  -15 01 05.34  23.3i 16TW94    W84  C~55aG      
2016 09  24.33328  02 55 01.789  -13 54 23.75  23.7r 16TW94    W84  C~55aG      
2016 09  25.25373  02 54 58.799  -13 55 02.64  24.2g 16TW94    W84  C~55aG      
2016 10  07.34003  02 54 14.626  -14 03 04.13  23.9r 16TW94    807  C~2AEF      
2016 10  08.27279  02 54 10.873  -14 03 38.82  24.0r 16TW94    807  C~2AEF      
2016 12  05.22098  02 49 43.848  -14 20 46.73  23.7r 16TW94    W84  C~55aG      
2016 12  05.22371  02 49 43.846  -14 20 46.80  24.8g 16TW94    W84  C~55aG      
2017 02  02.06665  02 47 48.318  -13 53 01.43  23.0z 16TW94    W84  C~55aG      
2018 01  09.12005  02 53 21.816  -13 47 47.25  22.9r 16TW94    W84  C~55aG      

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     0.24       0.00    -0.14
     2   0.0136   -366.64    -0.15      17.03     0.15
     3   0.1310  -2952.66    -0.08     854.50    -0.07
     4   1.9056  12259.51     0.14    -579.87     0.06
     5   1.9081  12204.70    -0.22    -600.50    -0.02
     6   1.9412  11429.05 (   0.03)   -818.73 (   0.53)
     7   1.9437  11365.43 (   0.12)   -831.49 (   0.60)
     8   2.1024   7363.06    -0.01    -404.20     0.08
     9   2.1024   7363.01     0.09    -404.25    -0.05
    10   2.2635   6379.42    -0.05    1749.22     0.08
    11   3.1972  11039.29     0.03     314.71    -0.10

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.

16TW94    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.073    43.099    43.048
ecceobj         0.072     0.074     0.069
incobj         28.877    28.877    28.877
qmin           38.981    38.930    39.068
qmax           46.762    46.924    46.693
amean          42.769    42.794    42.745
amin           42.441    42.468    42.425
amax           43.110    43.147    43.100
emean           0.072     0.074     0.070
emin            0.060     0.062     0.057
emax            0.085     0.088     0.083
imean          27.492    27.490    27.493
imin           27.175    27.176    27.181
imax           27.820    27.825    27.822
excite_mean     0.467     0.468     0.467
fracstop        1.000     1.000     1.000
cjmean          2.814     2.814     2.814

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       182.8     182.9     183.0
kozaiamp        180.0     180.0     180.0