Orbit Fit and Astrometric record for 15VT152

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: 15VT152   
# Created Mon Dec 11 02:38:15 2017
# Orbit generated from Bernstein formalism
# Fitting    8 observations of    8
# Arc:  23.93d
# First observation: 2015/11/06
#  Last observation: 2015/11/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000011   0.057177   0.000012  -0.019224   0.046417   0.000000
# Chi-squared of fit:     3.06 DOF:   10 RMS:  0.11
# Min/Max residuals:    -0.17    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.760990E-05  5.258712E-02 -5.913390E-06 -1.701074E-02  4.582470E-02 -4.454834E-03
# Covariance matrix:
  8.7595E-13  9.8596E-11  3.9793E-14 -5.0443E-11  2.5824E-11  1.6407E-09
  9.8596E-11  1.1610E-07  1.6285E-10 -5.4791E-08  2.1128E-08 -8.7215E-07
  3.9793E-14  1.6285E-10  7.4980E-13 -8.7291E-11  2.7428E-11 -2.1619E-09
 -5.0443E-11 -5.4791E-08 -8.7291E-11  2.6268E-08 -9.9813E-09  4.2019E-07
  2.5824E-11  2.1128E-08  2.7428E-11 -9.9813E-09  3.9784E-09 -1.0920E-07
  1.6407E-09 -8.7215E-07 -2.1619E-09  4.2019E-07 -1.0920E-07  2.6945E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -37.879992   19.255781   -0.404282   -0.557900   -0.717530  2457332.806611
# Heliocentric elements and errors
Epoch:              2457330.5000  =  2015/11/04
Mean Anomaly:          207.12941 +/-    24.332
Argument of Peri:       48.98716 +/-    23.872
Long of Asc Node:      137.89183 +/-     0.200
Inclination:            39.75881 +/-     0.051
Eccentricity:         0.18055910 +/-    0.0212
Semi-Major Axis:     19.33581456 +/-    0.2880
Time of Perihelion: 2470518.0334 +/-    2078.3
Perihelion:          15.84455727 +/-    0.4728
Aphelion:            22.82707185 +/-    0.5324
Period (y)               85.0260 +/-      1.90
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           16.98155492 +/-    0.0224
Ecliptic Y            6.36105279 +/-    0.0078
Ecliptic Z          -13.39926002 +/-    0.0185
Ecliptic XDOT        -0.00182502 +/-    0.0002
Ecliptic YDOT         0.00268435 +/-    0.0001
Ecliptic ZDOT        -0.00063872 +/-    0.0002
# Distances at JD0 (AU)
Heliocenter to KBO   22.54720313 +/-    0.0202
Geocenter to KBO     21.82229201 +/-    0.0300
# Hcoef: 10.07

The following table shows the complete astrometric record for 15VT152. 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 (15VT152) followed by the observatory code and reference code for the source of the astrometry.

2015 11  06.305822 02 11 49.07   -27 22 27.5   23.2i 15VT152   W84  C~1yTE      
2015 11  07.305231 02 11 39.93   -27 22 47.4   23.1r 15VT152   W84  C~1yTE      
2015 11  14.120428 02 10 38.88   -27 24 08.1   23.1r 15VT152   W84  C~1yTE      
2015 11  14.121806 02 10 38.87   -27 24 07.9   23.8g 15VT152   W84  C~1yTE      
2015 11  15.126481 02 10 30.07   -27 24 12.3   22.6i 15VT152   W84  C~1yTE      
2015 11  21.101111 02 09 39.34   -27 23 53.7   22.7i 15VT152   W84  C~1yTE      
2015 11  30.232743 02 08 28.05   -27 21 07.3   23.0i 15VT152   W84  C~1yTE      
2015 11  30.234109 02 08 28.04   -27 21 07.2   22.6z 15VT152   W84  C~1yTE      

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     0.11       0.00     0.01
  2   0.0027   -118.74    -0.14      33.43    -0.09
  3   0.0214   -890.04     0.04     303.12     0.06
  4   0.0214   -890.08     0.15     303.35     0.24
  5   0.0241   -998.25    -0.15     348.65    -0.09
  6   0.0405  -1603.66    -0.01     649.10    -0.17
  7   0.0655  -2396.95    -0.01    1197.13    -0.00
  8   0.0655  -2397.03     0.02    1197.27     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.

15VT152    quality flag:1

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        19.424    20.972    18.939
ecceobj         0.175     0.102     0.248
incobj         39.711    39.990    39.546
qmin           15.902    18.356    13.088
qmax           23.062    23.591    25.536
amean          19.249    20.898    19.057
amin           18.775    20.714    18.725
amax           19.565    21.037    19.564
emean           0.108     0.107     0.227
emin            0.029     0.095     0.100
emax            0.181     0.122     0.317
imean          38.352    38.734    37.748
imin           37.673    38.597    35.121
imax           39.192    38.871    39.758
excite_mean     0.630     0.635     0.655
fracstop        0.098     0.005     0.090
cjmean          2.809     2.739     2.802

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       156.3     156.2     186.9
kozaiamp        180.0       8.9     179.9