Orbit Fit and Astrometric record for 15VW164

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: 15VW164   
# Created Thu Feb 21 02:10:24 2019
# Orbit generated from Bernstein formalism
# Fitting   33 observations of   33
# Arc:   2.32y
# First observation: 2015/08/20
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000177   0.033016  -0.000003  -0.000650   0.029250   0.000000
# Chi-squared of fit:     3.42 DOF:   60 RMS:  0.06
# Min/Max residuals:    -0.13    0.14
# Exact a, adot, b, bdot, g, gdot:
  1.795794E-05  3.246961E-02 -1.580507E-07 -6.420903E-04  2.895376E-02  4.332230E-03
# Covariance matrix:
  1.8762E-13 -5.8142E-14  1.0283E-15 -4.6148E-16  1.0540E-13  3.4292E-13
 -5.8142E-14  7.0164E-13  9.1831E-15 -2.7584E-14  3.1208E-13  1.7314E-11
  1.0283E-15  9.1831E-15  9.7861E-14 -8.0046E-14  5.6228E-15  2.6924E-13
 -4.6148E-16 -2.7584E-14 -8.0046E-14  1.1734E-13 -1.4120E-14 -8.1734E-13
  1.0540E-13  3.1208E-13  5.6228E-15 -1.4120E-14  2.6536E-13  8.9190E-12
  3.4292E-13  1.7314E-11  2.6924E-13 -8.1734E-13  8.9190E-12  5.1285E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.765248   52.787098    1.011637   -0.000899   -0.077375  2457255.076589
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:           33.98114 +/-     0.113
Argument of Peri:      167.56927 +/-     0.183
Long of Asc Node:      197.61616 +/-     0.014
Inclination:             1.38259 +/-     0.000
Eccentricity:         0.15736175 +/-    0.0006
Semi-Major Axis:     39.39208206 +/-    0.0091
Time of Perihelion: 2448726.4245 +/-      28.2
Perihelion:          33.19327495 +/-    0.0245
Aphelion:            45.59088918 +/-    0.0255
Period (y)              247.2416 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.73429516 +/-    0.0004
Ecliptic Y           26.95292133 +/-    0.0005
Ecliptic Z           -0.46126101 +/-    0.0000
Ecliptic XDOT        -0.00219993 +/-    0.0000
Ecliptic YDOT         0.00217606 +/-    0.0000
Ecliptic ZDOT        -0.00006613 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.62733481 +/-    0.0004
Geocenter to KBO     34.53782588 +/-    0.0006
# Hcoef:  8.18

The following table shows the complete astrometric record for 15VW164. 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 (15VW164) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.57580  03 22 21.441  +17 43 42.27  23.7w 15VW164   568  C~2lVY      
2015 09  07.61675  03 22 14.955  +17 42 46.67  23.7w 15VW164   568  C~2lVY      
2015 10  07.52101  03 20 47.134  +17 36 31.90  23.7w 15VW164   568  C~2lVY      
2015 10  07.58040  03 20 46.871  +17 36 30.81  23.7w 15VW164   568  C~2lVY      
2015 10  09.56029  03 20 38.154  +17 35 55.48  23.7w 15VW164   568  C~2lVY      
2015 11  06.33360  03 18 11.323  +17 26 12.23  23.4r 15VW164   568  C~2lVY      
2015 11  06.39716  03 18 10.946  +17 26 10.68  23.3r 15VW164   568  C~2lVY      
2015 11  06.40423  03 18 10.903  +17 26 10.63  23.4r 15VW164   568  C~2lVY      
2015 11  06.47375  03 18 10.495  +17 26 08.93  23.4r 15VW164   568  C~2lVY      
2015 11  07.49015  03 18 04.542  +17 25 45.65  23.5w 15VW164   568  C~2lVY      
2015 11  17.47136  03 17 05.687  +17 21 55.58  23.6w 15VW164   568  C~2lVY      
2015 11  17.55969  03 17 05.149  +17 21 53.45  23.6w 15VW164   568  C~2lVY      
2015 12  06.33759  03 15 18.340  +17 14 59.74  23.4w 15VW164   568  C~2lVY      
2015 12  06.47504  03 15 17.595  +17 14 56.83  23.7w 15VW164   568  C~2lVY      
2016 01  01.34872  03 13 22.134  +17 07 38.64  23.7w 15VW164   568  C~2lVY      
2016 01  07.41130  03 13 03.454  +17 06 29.99  23.7w 15VW164   568  C~2lVY      
2016 01  07.42868  03 13 03.410  +17 06 29.86  23.7w 15VW164   568  C~2lVY      
2016 01  08.25624  03 13 01.179  +17 06 21.82  23.7w 15VW164   568  C~2lVY      
2016 02  05.28768  03 12 30.850  +17 04 50.45  23.7w 15VW164   568  C~2lVY      
2016 02  10.30807  03 12 35.297  +17 05 13.37  23.8w 15VW164   568  C~2lVY      
2016 09  07.59099  03 29 52.562  +18 08 18.29  23.8w 15VW164   568  C~2lVY      
2016 09  27.52301  03 29 05.886  +18 04 58.70  23.7w 15VW164   568  C~2lVY      
2016 10  05.50531  03 28 36.103  +18 03 00.38  23.9w 15VW164   568  C~2lVY      
2016 10  07.50982  03 28 27.756  +18 02 27.76  23.8w 15VW164   568  C~2lVY      
2016 10  07.60551  03 28 27.331  +18 02 26.11  23.8w 15VW164   568  C~2lVY      
2016 10  09.51019  03 28 19.090  +18 01 54.01  23.6w 15VW164   568  C~2lVY      
2016 10  09.58259  03 28 18.771  +18 01 52.75  23.8w 15VW164   568  C~2lVY      
2016 11  02.49681  03 26 15.274  +17 54 01.31  23.6w 15VW164   568  C~2lVY      
2016 11  04.47292  03 26 03.897  +17 53 18.45  23.6w 15VW164   568  C~2lVY      
2016 12  28.44773  03 21 14.706  +17 35 31.76  23.6w 15VW164   568  C~2lVY      
2017 01  27.29772  03 20 05.282  +17 31 38.62  23.7w 15VW164   568  C~2lVY      
2017 12  13.37172  03 30 06.351  +18 05 30.44  23.6w 15VW164   568  C~2lVY      
2017 12  13.40930  03 30 06.147  +18 05 29.79  23.8w 15VW164   568  C~2lVY      

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    -0.04
  2   0.0494   -103.71    -0.06     -30.38     0.01
  3   0.1313  -1412.97    -0.01     -74.53     0.04
  4   0.1314  -1416.89    -0.02     -74.62    -0.00
  5   0.1369  -1546.41    -0.01     -77.05     0.01
  6   0.2129  -3726.44     0.11    -102.46     0.12
  7   0.2131  -3732.06     0.08    -102.57     0.01
  8   0.2131  -3732.66     0.10    -102.46     0.12
  9   0.2133  -3738.75     0.14    -102.59    -0.00
 10   0.2161  -3827.09     0.01    -103.11     0.05
 11   0.2434  -4700.75     0.02    -107.47    -0.00
 12   0.2436  -4708.74    -0.13    -107.53    -0.04
 13   0.2950  -6294.43     0.00    -108.70     0.04
 14   0.2954  -6305.50     0.04    -108.72    -0.04
 15   0.3663  -8019.14    -0.04     -96.85     0.01
 16   0.3828  -8295.98    -0.13     -92.34    -0.10
 17   0.3829  -8296.63    -0.04     -92.30    -0.07
 18   0.3852  -8329.65     0.07     -91.60    -0.02
 19   0.4619  -8773.93    -0.03     -64.61     0.02
 20   0.4757  -8706.25    -0.05     -59.39    -0.02
 21   1.0514   6605.24    -0.03    -164.67    -0.02
 22   1.1059   5910.59     0.06    -196.37    -0.08
 23   1.1278   5469.50    -0.04    -207.42    -0.09
 24   1.1333   5346.01     0.05    -209.94    -0.02
 25   1.1336   5339.72    -0.08    -210.06    -0.04
 26   1.1388   5217.82    -0.07    -212.41     0.02
 27   1.1390   5213.09     0.03    -212.52    -0.02
 28   1.2044   3388.33    -0.03    -235.63    -0.00
 29   1.2098   3220.33     0.00    -236.94    -0.02
 30   1.3576  -1046.99     0.02    -232.93     0.07
 31   1.4393  -2066.52     0.05    -205.49     0.02
 32   2.3157   6755.39     0.05    -375.31     0.02
 33   2.3158   6752.41    -0.03    -375.24     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.

15VW164    quality flag:3

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

axisobj        39.822    39.858    39.786
ecceobj         0.167     0.169     0.165
incobj          1.376     1.376     1.376
qmin           32.628    32.583    32.585
qmax           46.642    46.722    46.596
amean          39.457    39.457    39.457
amin           39.117    39.093    39.119
amax           39.851    39.883    39.843
emean           0.156     0.156     0.155
emin            0.139     0.141     0.140
emax            0.171     0.173     0.171
imean           2.350     2.337     2.378
imin            1.865     1.863     1.918
imax            2.871     2.880     2.890
excite_mean     0.161     0.162     0.160
fracstop        1.000     1.000     1.000
cjmean          3.022     3.022     3.023

libcent 0       180.1     180.4     179.7
libamp  0        34.2      47.9      31.1
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       179.7     173.1     179.3
kozaiamp        180.0     180.0     180.0