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  6 02:13:34 2021
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   2.03y
# First observation: 2015/11/06
#  Last observation: 2017/11/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000072   0.053643  -0.000064  -0.017644   0.047094   0.000000
# Chi-squared of fit:    14.31 DOF:     32 RMS:  0.15
# Min/Max residuals:    -0.34    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.725069E-05  5.280707E-02 -6.298431E-06 -1.708516E-02  4.585116E-02 -1.203703E-02
# Covariance matrix:
  1.9011E-13 -1.7498E-13 -1.0972E-14  1.2537E-14  6.2142E-14 -7.2036E-13
 -1.7498E-13  1.0494E-12  8.4336E-15 -2.9698E-13  6.6142E-13  9.7701E-12
 -1.0972E-14  8.4336E-15  1.7591E-13 -1.1293E-13 -5.9846E-14  1.3477E-13
  1.2537E-14 -2.9698E-13 -1.1293E-13  2.4266E-13 -2.6227E-13 -3.1683E-12
  6.2142E-14  6.6142E-13 -5.9846E-14 -2.6227E-13  1.1550E-12  6.6764E-12
 -7.2036E-13  9.7701E-12  1.3477E-13 -3.1683E-12  6.6764E-12  1.0553E-10
#      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:          249.52376 +/-     0.040
Argument of Peri:       21.59217 +/-     0.029
Long of Asc Node:      137.56748 +/-     0.001
Inclination:            39.67593 +/-     0.000
Eccentricity:         0.23833040 +/-    0.0001
Semi-Major Axis:     20.00598542 +/-    0.0020
Time of Perihelion: 2467360.5882 +/-       3.3
Perihelion:          15.23795089 +/-    0.0027
Aphelion:            24.77401995 +/-    0.0034
Period (y)               89.4846 +/-      0.01
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           16.97216803 +/-    0.0004
Ecliptic Y            6.35776514 +/-    0.0001
Ecliptic Z          -13.39153342 +/-    0.0003
Ecliptic XDOT        -0.00216823 +/-    0.0000
Ecliptic YDOT         0.00257645 +/-    0.0000
Ecliptic ZDOT        -0.00036387 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   22.53461410 +/-    0.0003
Geocenter to KBO     21.80969747 +/-    0.0005
# Hcoef:  9.37

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      
2016 10  28.332986 02 27 24.89   -26 51 47.1         15VT152   W84  C~3xrk      
2016 10  28.334352 02 27 24.88   -26 51 46.9         15VT152   W84  C~3xrk      
2016 10  28.335741 02 27 24.85   -26 51 47.2         15VT152   W84  C~3xrk      
2016 11  28.220984 02 22 47.94   -26 56 56.8         15VT152   W84  C~3xrk      
2016 11  28.222350 02 22 47.95   -26 56 57.0         15VT152   W84  C~3xrk      
2017 01  30.066146 02 19 34.57   -25 40 18.7   22.6i 15VT152   W84  C~3xrk      
2017 01  30.068079 02 19 34.58   -25 40 18.5   23.0g 15VT152   W84  C~3xrk      
2017 01  30.069468 02 19 34.60   -25 40 18.2   22.6r 15VT152   W84  C~3xrk      
2017 11  18.283275 02 38 43.05   -26 27 36.5         15VT152   W84  C~3xrk      
2017 11  18.284653 02 38 43.02   -26 27 36.5         15VT152   W84  C~3xrk      
2017 11  18.286042 02 38 43.02   -26 27 36.4         15VT152   W84  C~3xrk      

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     0.20       0.00     0.08
     2   0.0027   -118.74    -0.09      33.43    -0.00
     3   0.0214   -890.04    -0.06     303.12     0.20
     4   0.0214   -890.08     0.06     303.35     0.37
     5   0.0241   -998.25    -0.25     348.65     0.04
     6   0.0405  -1603.66    -0.09     649.10    -0.13
     7   0.0655  -2396.95     0.08    1197.13    -0.34
     8   0.0655  -2397.03     0.11    1197.27    -0.28
     9   0.9775  12057.01    -0.05   -3808.28    -0.18
    10   0.9775  12056.98     0.10   -3808.04     0.03
    11   0.9775  12056.49    -0.21   -3808.13    -0.09
    12   1.0621   8594.62     0.09   -2427.16     0.26
    13   1.0621   8594.65     0.24   -2427.40    -0.07
    14   1.2341   8279.87    -0.15    2850.44     0.08
    15   1.2341   8280.08    -0.09    2850.57     0.04
    16   1.2341   8280.45     0.17    2850.72     0.07
    17   2.0342  20856.61     0.05   -6729.13    -0.10
    18   2.0342  20856.25    -0.15   -6728.94     0.01
    19   2.0342  20856.30     0.05   -6728.85     0.02

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:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        20.099    20.102    20.096
ecceobj         0.233     0.233     0.233
incobj         39.625    39.625    39.626
qmin           15.125    15.079    15.098
qmax           25.240    25.257    25.142
amean          20.099    20.134    20.095
amin           19.903    19.963    19.950
amax           20.299    20.592    20.509
emean           0.220     0.218     0.222
emin            0.168     0.160     0.172
emax            0.248     0.247     0.245
imean          38.190    38.280    38.223
imin           37.757    37.838    37.823
imax           38.947    38.910    38.866
excite_mean     0.657     0.657     0.658
fracstop        0.022     0.023     0.020
cjmean          2.750     2.748     2.750

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        50.4      49.5      49.4
kozaiamp         26.6      25.4      25.3