Orbit Fit and Astrometric record for 15VX165

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: 15VX165   
# Created Tue Apr 23 01:10:47 2019
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   27
# Arc:   1.44y
# First observation: 2015/08/20
#  Last observation: 2017/01/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000217   0.032268  -0.000009  -0.009841   0.031428   0.000000
# Chi-squared of fit:     4.22 DOF:   48 RMS:  0.07
# Min/Max residuals:    -0.15    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.657862E-05  3.149693E-02 -5.305453E-06 -9.635605E-03  3.099310E-02  1.081456E-03
# Covariance matrix:
  3.5844E-13  1.2111E-13  4.2065E-14 -1.9021E-13  3.9321E-13  1.3178E-11
  1.2111E-13  7.6211E-13  8.6253E-14 -4.1633E-13  5.8873E-13  2.8679E-11
  4.2065E-14  8.6253E-14  1.4260E-13 -2.0151E-13  9.6608E-14  4.6790E-12
 -1.9021E-13 -4.1633E-13 -2.0151E-13  5.6286E-13 -4.5320E-13 -2.2662E-11
  3.9321E-13  5.8873E-13  9.6608E-14 -4.5320E-13  7.6773E-13  3.1296E-11
  1.3178E-11  2.8679E-11  4.6790E-12 -2.2662E-11  3.1296E-11  1.5606E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.731468   54.155112    1.013221   -0.001465   -0.052845  2457255.056669
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          179.33909 +/-     0.840
Argument of Peri:        6.41474 +/-     0.842
Long of Asc Node:      226.75496 +/-     0.000
Inclination:            17.15532 +/-     0.001
Eccentricity:         0.07539585 +/-    0.0001
Semi-Major Axis:     30.06474477 +/-    0.0015
Time of Perihelion: 2487467.1567 +/-     140.4
Perihelion:          27.79798774 +/-    0.0021
Aphelion:            32.33150180 +/-    0.0023
Period (y)              164.8521 +/-      0.01
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           19.73397811 +/-    0.0005
Ecliptic Y           25.59174954 +/-    0.0007
Ecliptic Z           -0.97504913 +/-    0.0000
Ecliptic XDOT        -0.00221653 +/-    0.0000
Ecliptic YDOT         0.00167952 +/-    0.0000
Ecliptic ZDOT        -0.00085363 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   32.33138193 +/-    0.0007
Geocenter to KBO     32.26525002 +/-    0.0009
# Hcoef:  9.04

The following table shows the complete astrometric record for 15VX165. 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 (15VX165) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.55588  03 28 55.038  +17 07 54.56  24.5w 15VX165   568  C~2lVc      
2015 09  07.60452  03 28 51.079  +17 04 58.06  24.1w 15VX165   568  C~2lVc      
2015 09  12.45550  03 28 43.246  +17 03 46.39  24.3w 15VX165   568  C~2lVc      
2015 10  09.54258  03 27 11.525  +16 54 23.53  24.1w 15VX165   568  C~2lVc      
2015 11  06.31779  03 24 35.305  +16 41 28.06  24.0r 15VX165   568  C~2lVc      
2015 11  06.38117  03 24 34.905  +16 41 26.32  24.2r 15VX165   568  C~2lVc      
2015 11  06.45191  03 24 34.449  +16 41 24.14  23.9r 15VX165   568  C~2lVc      
2015 11  06.46851  03 24 34.361  +16 41 23.66  24.0r 15VX165   568  C~2lVc      
2015 11  07.47269  03 24 28.042  +16 40 53.94  24.0w 15VX165   568  C~2lVc      
2015 11  17.45383  03 23 24.624  +16 35 58.45  23.9w 15VX165   568  C~2lVc      
2015 11  17.54213  03 23 24.051  +16 35 55.93  24.0w 15VX165   568  C~2lVc      
2015 12  06.32006  03 21 27.923  +16 27 06.68  24.1w 15VX165   568  C~2lVc      
2015 12  06.45375  03 21 27.125  +16 27 03.19  24.2w 15VX165   568  C~2lVc      
2015 12  31.34139  03 19 23.113  +16 17 44.81  24.2w 15VX165   568  C~2lVc      
2016 01  07.37652  03 18 58.139  +16 15 51.11  23.9w 15VX165   568  C~2lVc      
2016 01  08.23883  03 18 55.466  +16 15 38.49  24.4w 15VX165   568  C~2lVc      
2016 02  05.32968  03 18 16.899  +16 12 15.25  24.5w 15VX165   568  C~2lVc      
2016 02  11.27580  03 18 21.605  +16 12 23.47  24.3w 15VX165   568  C~2lVc      
2016 09  25.61718  03 36 06.241  +16 53 10.22  24.4w 15VX165   568  C~2lVc      
2016 10  10.55675  03 35 06.170  +16 47 26.72  24.2w 15VX165   568  C~2lVc      
2016 10  10.60523  03 35 05.937  +16 47 25.47  24.3w 15VX165   568  C~2lVc      
2016 10  28.47637  03 33 29.939  +16 39 26.32  24.2w 15VX165   568  C~2lVc      
2016 10  29.53828  03 33 23.631  +16 38 56.29  24.4w 15VX165   568  C~2lVc      
2016 10  29.55586  03 33 23.524  +16 38 55.96  24.5w 15VX165   568  C~2lVc      
2016 11  02.59127  03 32 59.081  +16 37 01.01  23.7w 15VX165   568  C~2lVc      
2016 12  24.35153  03 27 50.593  +16 14 34.13  24.4w 15VX165   568  C~2lVc      
2017 01  27.33320  03 26 11.342  +16 07 41.21  24.4w 15VX165   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    -0.11       0.00     0.08
  2   0.0494    -98.07     0.01    -157.34     0.11
  3   0.0627   -224.48     0.07    -199.45    -0.02
  4   0.1369  -1638.11    -0.06    -422.87    -0.04
  5   0.2129  -4004.02    -0.04    -619.10    -0.07
  6   0.2131  -4010.02     0.03    -619.35     0.04
  7   0.2133  -4016.91    -0.06    -619.83    -0.04
  8   0.2133  -4018.26     0.19    -619.98    -0.09
  9   0.2161  -4113.63    -0.01    -626.15    -0.02
 10   0.2434  -5070.46     0.02    -684.58    -0.01
 11   0.2436  -5079.08     0.02    -684.95     0.09
 12   0.2950  -6829.97    -0.00    -776.99    -0.08
 13   0.2954  -6841.98    -0.00    -777.46    -0.03
 14   0.3635  -8712.71     0.04    -864.21    -0.07
 15   0.3828  -9090.12    -0.03    -882.28     0.16
 16   0.3852  -9130.64    -0.05    -884.64    -0.07
 17   0.4621  -9720.86    -0.01    -938.87     0.03
 18   0.4784  -9653.09    -0.01    -948.32     0.04
 19   1.1008   5795.57    -0.04   -2339.38    -0.04
 20   1.1417   4875.85    -0.04   -2470.07    -0.02
 21   1.1418   4872.30    -0.04   -2470.49    -0.05
 22   1.1907   3418.26    -0.15   -2608.85     0.03
 23   1.1937   3323.04     0.04   -2616.42    -0.06
 24   1.1937   3321.46     0.08   -2616.37     0.11
 25   1.2048   2952.77     0.20   -2644.19    -0.06
 26   1.3465  -1680.23    -0.06   -2877.31     0.00
 27   1.4395  -3168.00     0.01   -2925.87     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.

15VX165    quality flag:3

Type:            1:1       1:1       1:1

axisobj        30.275    30.288    30.263
ecceobj         0.069     0.069     0.070
incobj         17.090    17.090    17.090
qmin           27.021    26.984    27.020
qmax           33.298    33.338    33.320
amean          30.110    30.110    30.110
amin           29.840    29.836    29.841
amax           30.427    30.431    30.431
emean           0.076     0.076     0.077
emin            0.054     0.054     0.055
emax            0.098     0.098     0.098
imean          17.969    17.977    17.965
imin           17.766    17.765    17.761
imax           18.162    18.160    18.157
excite_mean     0.318     0.318     0.318
fracstop        1.000     1.000     1.000
cjmean          2.895     2.895     2.895

libcent 0        61.2      61.2      61.1
libamp  0        16.3      17.0      16.3
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       176.8     177.0     176.7
kozaiamp        180.0     180.0     180.0