Orbit Fit and Astrometric record for 15VT165

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: 15VT165   
# Created Mon Apr 22 01:10:11 2019
# Orbit generated from Bernstein formalism
# Fitting   14 observations of   14
# Arc:   2.11y
# First observation: 2015/08/11
#  Last observation: 2017/09/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000154   0.043697  -0.000060  -0.010065   0.034833   0.000000
# Chi-squared of fit:     4.96 DOF:   22 RMS:  0.11
# Min/Max residuals:    -0.21    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.970798E-05  4.306257E-02 -4.635497E-06 -1.001260E-02  3.422720E-02  6.328320E-03
# Covariance matrix:
  3.6925E-13  4.0715E-13  4.7769E-14 -1.4693E-13  5.4614E-13  6.4334E-12
  4.0715E-13  3.3532E-12  2.3427E-13 -9.1586E-13  2.0700E-12  4.0164E-11
  4.7769E-14  2.3427E-13  1.7371E-13 -1.7189E-13  1.6945E-13  2.9750E-12
 -1.4693E-13 -9.1586E-13 -1.7189E-13  4.6159E-13 -5.9827E-13 -1.1651E-11
  5.4614E-13  2.0700E-12  1.6945E-13 -5.9827E-13  1.6972E-12  2.6220E-11
  6.4334E-12  4.0164E-11  2.9750E-12 -1.1651E-11  2.6220E-11  5.1097E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.339516   50.646850    1.015203    0.002302    0.037330  2457246.085349
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:           15.92014 +/-     0.056
Argument of Peri:      165.62164 +/-     0.111
Long of Asc Node:      214.65830 +/-     0.001
Inclination:            13.57319 +/-     0.001
Eccentricity:         0.27682325 +/-    0.0003
Semi-Major Axis:     39.28949122 +/-    0.0080
Time of Perihelion: 2453262.5663 +/-      14.0
Perihelion:          28.41324656 +/-    0.0140
Aphelion:            50.16573588 +/-    0.0164
Period (y)              246.2764 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           19.25201624 +/-    0.0007
Ecliptic Y           21.88062419 +/-    0.0009
Ecliptic Z           -1.70204108 +/-    0.0001
Ecliptic XDOT        -0.00237475 +/-    0.0000
Ecliptic YDOT         0.00253255 +/-    0.0000
Ecliptic ZDOT        -0.00082898 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   29.19415674 +/-    0.0008
Geocenter to KBO     29.21652912 +/-    0.0011
# Hcoef: 10.11

The following table shows the complete astrometric record for 15VT165. 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 (15VT165) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.58456  03 16 29.880  +14 41 29.33  24.7w 15VT165   568  C~2lVc      
2015 09  06.63168  03 16 38.554  +14 36 22.45  24.7w 15VT165   568  C~2lVc      
2015 09  12.52133  03 16 28.060  +14 34 25.94  24.7w 15VT165   568  C~2lVc      
2015 10  07.45992  03 14 58.230  +14 23 38.88  24.7w 15VT165   568  C~2lVc      
2015 10  08.46335  03 14 53.282  +14 23 08.60  25.0w 15VT165   568  C~2lVc      
2015 10  08.52236  03 14 52.968  +14 23 06.71  25.8w 15VT165   568  C~2lVc      
2015 11  07.36952  03 11 54.719  +14 06 54.35  24.5r 15VT165   568  C~2lVc      
2015 11  07.41164  03 11 54.435  +14 06 52.98  24.6r 15VT165   568  C~2lVc      
2015 11  07.45387  03 11 54.164  +14 06 51.55  24.3r 15VT165   568  C~2lVc      
2015 11  17.38710  03 10 48.408  +14 01 27.00  24.7w 15VT165   568  C~2lVc      
2015 11  17.43381  03 10 48.094  +14 01 25.54  24.6w 15VT165   568  C~2lVc      
2017 01  27.29257  03 16 24.690  +13 46 59.28  25.3w 15VT165   568  C~2lVc      
2017 09  15.55206  03 37 23.552  +14 40 30.90  25.3w 15VT165   568  C~2lVc      
2017 09  20.60085  03 37 11.969  +14 38 38.46  24.7w 15VT165   568  C~2lVc      

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     0.04       0.00     0.00
  2   0.0713     41.53     0.18    -329.08     0.27
  3   0.0874   -135.91    -0.15    -401.85     0.06
  4   0.1557  -1564.40    -0.10    -685.13     0.08
  5   0.1585  -1641.73     0.09    -695.49     0.04
  6   0.1586  -1646.62    -0.11    -696.11    -0.02
  7   0.2403  -4403.52    -0.09    -949.90    -0.16
  8   0.2405  -4407.87    -0.10    -950.13    -0.13
  9   0.2406  -4412.05     0.07    -950.46    -0.21
 10   0.2678  -5421.26     0.08   -1008.76    -0.00
 11   0.2679  -5426.06     0.10   -1008.95     0.03
 12   1.4640   -925.75    -0.01   -3137.47     0.07
 13   2.0971  17646.09    -0.03   -4608.41     0.04
 14   2.1109  17454.68     0.03   -4677.62    -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.

15VT165    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.758    39.805    39.712
ecceobj         0.286     0.287     0.284
incobj         13.527    13.527    13.527
qmin           27.441    27.088    27.312
qmax           51.880    52.311    52.328
amean          39.456    39.455    39.454
amin           39.028    39.061    39.008
amax           39.962    39.970    40.013
emean           0.229     0.249     0.274
emin            0.165     0.175     0.247
emax            0.302     0.312     0.308
imean          16.482    15.449    14.246
imin           12.763    11.861    12.523
imax           18.714    18.660    15.559
excite_mean     0.367     0.368     0.369
fracstop        1.000     1.000     1.000
cjmean          2.898     2.897     2.896

libcent 0       180.1     179.7     180.9
libamp  0        74.5      57.9      86.5
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       126.1     223.9     167.0
kozaiamp        180.0     180.0     180.0