Orbit Fit and Astrometric record for 15VW166

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: 15VW166   
# Created Tue Feb 19 02:10:39 2019
# Orbit generated from Bernstein formalism
# Fitting   35 observations of   35
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000080   0.023121  -0.000001   0.000609   0.023705   0.000000
# Chi-squared of fit:    12.68 DOF:   64 RMS:  0.11
# Min/Max residuals:    -0.21    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.593458E-05  2.289611E-02  6.918960E-07  6.008539E-04  2.362285E-02 -1.566880E-03
# Covariance matrix:
  1.7165E-13 -3.0996E-14 -2.7135E-16  1.4910E-15  1.0939E-13  1.2083E-12
 -3.0996E-14  3.0287E-13 -2.5789E-15  1.0009E-14  1.7348E-13  8.0194E-12
 -2.7135E-16 -2.5789E-15  1.0203E-13 -7.0897E-14 -1.7863E-15 -9.4516E-14
  1.4910E-15  1.0009E-14 -7.0897E-14  8.2791E-14  7.4802E-15  3.6516E-13
  1.0939E-13  1.7348E-13 -1.7863E-15  7.4802E-15  2.3408E-13  6.0103E-12
  1.2083E-12  8.0194E-12 -9.4516E-14  3.6516E-13  6.0103E-12  2.9252E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.236615   51.601494    0.930977   -0.001480   -0.394341  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          287.96889 +/-     0.027
Argument of Peri:       73.79366 +/-     0.082
Long of Asc Node:       59.21714 +/-     0.004
Inclination:             1.52117 +/-     0.001
Eccentricity:         0.09455778 +/-    0.0007
Semi-Major Axis:     43.64027167 +/-    0.0062
Time of Perihelion: 2478339.6604 +/-       6.5
Perihelion:          39.51374447 +/-    0.0331
Aphelion:            47.76679887 +/-    0.0333
Period (y)              288.2965 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.26372515 +/-    0.0005
Ecliptic Y           32.90621579 +/-    0.0007
Ecliptic Z           -0.17478102 +/-    0.0000
Ecliptic XDOT        -0.00219415 +/-    0.0000
Ecliptic YDOT         0.00149973 +/-    0.0000
Ecliptic ZDOT         0.00007044 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.73359680 +/-    0.0006
Geocenter to KBO     42.33189832 +/-    0.0009
# Hcoef:  9.10

The following table shows the complete astrometric record for 15VW166. 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 (15VW166) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 16 58.382  +17 56 08.68  25.3w 15VW166   568  C~2lVg      
2015 09  12.49264  03 16 50.602  +17 55 38.87  25.3w 15VW166   568  C~2lVg      
2015 10  07.53854  03 15 39.947  +17 51 09.08  25.9w 15VW166   568  C~2lVg      
2015 10  07.59790  03 15 39.721  +17 51 08.07  25.1w 15VW166   568  C~2lVg      
2015 10  09.57780  03 15 32.237  +17 50 39.46  25.5w 15VW166   568  C~2lVg      
2015 11  07.33264  03 13 23.507  +17 42 25.17  24.7r 15VW166   568  C~2lVg      
2015 11  07.37479  03 13 23.299  +17 42 24.41  25.3r 15VW166   568  C~2lVg      
2015 11  07.41697  03 13 23.093  +17 42 23.49  24.9r 15VW166   568  C~2lVg      
2015 11  10.49950  03 13 07.976  +17 41 25.01  25.0w 15VW166   568  C~2lVg      
2015 11  17.34635  03 12 34.318  +17 39 15.39  25.5w 15VW166   568  C~2lVg      
2015 11  17.39294  03 12 34.080  +17 39 14.48  25.9w 15VW166   568  C~2lVg      
2015 12  06.35508  03 11 04.535  +17 33 29.24  25.3w 15VW166   568  C~2lVg      
2016 01  01.34294  03 09 28.209  +17 27 19.99  25.7w 15VW166   568  C~2lVg      
2016 01  08.25043  03 09 10.701  +17 26 14.05  25.3w 15VW166   568  C~2lVg      
2016 02  05.28189  03 08 44.206  +17 24 46.72  25.3w 15VW166   568  C~2lVg      
2016 02  10.30227  03 08 47.508  +17 25 03.63  25.5w 15VW166   568  C~2lVg      
2016 09  07.57363  03 22 15.570  +18 18 15.89  25.2w 15VW166   568  C~2lVg      
2016 09  27.51061  03 21 31.694  +18 15 34.51  25.4w 15VW166   568  C~2lVg      
2016 09  29.48481  03 21 25.624  +18 15 11.76  25.6w 15VW166   568  C~2lVg      
2016 10  05.48792  03 21 05.396  +18 13 57.31  25.4w 15VW166   568  C~2lVg      
2016 10  07.58817  03 20 57.733  +18 13 28.88  24.9w 15VW166   568  C~2lVg      
2016 10  09.49252  03 20 50.561  +18 13 02.44  26.3w 15VW166   568  C~2lVg      
2016 10  09.56525  03 20 50.279  +18 13 01.21  25.5w 15VW166   568  C~2lVg      
2016 11  02.53154  03 19 04.653  +18 06 28.74  25.6w 15VW166   568  C~2lVg      
2016 11  02.53733  03 19 04.621  +18 06 28.49  25.0w 15VW166   568  C~2lVg      
2016 11  04.40663  03 18 55.569  +18 05 54.97  25.5w 15VW166   568  C~2lVg      
2016 11  04.41248  03 18 55.541  +18 05 54.75  25.3w 15VW166   568  C~2lVg      
2016 12  24.32550  03 15 08.921  +17 51 47.64  25.6w 15VW166   568  C~2lVg      
2017 01  02.42780  03 14 40.304  +17 50 01.57  25.3w 15VW166   568  C~2lVg      
2017 01  26.34230  03 13 58.696  +17 47 34.18  26.1w 15VW166   568  C~2lVg      
2017 09  15.58856  03 27 23.699  +18 39 13.91  25.6w 15VW166   568  C~2lVg      
2017 09  22.57478  03 27 08.176  +18 38 19.19  25.8w 15VW166   568  C~2lVg      
2017 12  13.39064  03 21 13.726  +18 17 02.09  26.0w 15VW166   568  C~2lVg      
2017 12  13.42791  03 21 13.556  +18 17 01.24  26.1w 15VW166   568  C~2lVg      
2017 12  16.34929  03 21 01.361  +18 16 17.00  25.5w 15VW166   568  C~2lVg      

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    -0.13       0.00    -0.06
  2   0.0133   -114.96     0.10       0.06    -0.13
  3   0.0819  -1159.01    -0.06       2.45     0.12
  4   0.0821  -1162.39    -0.11       2.32    -0.03
  5   0.0875  -1273.02    -0.10       2.64     0.01
  6   0.1662  -3177.28    -0.04       9.21     0.20
  7   0.1663  -3180.35    -0.02       9.26     0.22
  8   0.1664  -3183.43    -0.00       9.15     0.08
  9   0.1749  -3407.29    -0.04       9.89    -0.20
 10   0.1936  -3905.64     0.05      12.38    -0.04
 11   0.1937  -3909.16    -0.03      12.40    -0.06
 12   0.2457  -5235.78     0.08      20.58     0.09
 13   0.3168  -6663.49    -0.01      34.54    -0.00
 14   0.3357  -6922.81     0.03      38.56    -0.17
 15   0.4125  -7311.96     0.02      56.84     0.00
 16   0.4262  -7261.82     0.16      60.35     0.22
 17   1.0019   4711.78    -0.04     124.25    -0.01
 18   1.0565   4066.07    -0.07     126.38     0.12
 19   1.0619   3976.62     0.09     126.32    -0.20
 20   1.0783   3678.89     0.22     127.53     0.08
 21   1.0841   3566.04     0.14     127.81    -0.02
 22   1.0893   3460.46     0.13     128.25     0.11
 23   1.0895   3456.26     0.12     128.08    -0.09
 24   1.1551   1900.23    -0.01     133.75    -0.06
 25   1.1551   1899.73    -0.10     133.62    -0.18
 26   1.1602   1766.38    -0.00     134.40     0.07
 27   1.1603   1765.94    -0.02     134.29    -0.04
 28   1.2969  -1576.47    -0.01     155.60     0.01
 29   1.3218  -1998.61    -0.06     160.45    -0.15
 30   1.3873  -2610.73    -0.21     174.60    -0.09
 31   2.0232   9276.04    -0.16     249.72    -0.09
 32   2.0423   9048.28     0.01     250.97     0.11
 33   2.2663   3840.68     0.12     276.10     0.21
 34   2.2664   3838.12    -0.07     275.90    -0.02
 35   2.2744   3658.83     0.00     277.27    -0.01

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.

15VW166    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE

axisobj        44.036    44.049    44.022
ecceobj         0.092     0.093     0.090
incobj          1.517     1.517     1.517
qmin           39.028    38.991    39.109
qmax           48.803    48.837    48.716
amean          43.726    43.727    43.726
amin           43.341    43.342    43.334
amax           44.154    44.152    44.153
emean           0.093     0.094     0.092
emin            0.081     0.082     0.081
emax            0.105     0.106     0.103
imean           0.976     0.985     0.974
imin            0.052     0.079     0.000
imax            1.635     1.694     1.595
excite_mean     0.095     0.096     0.094
fracstop        1.000     1.000     1.000
cjmean          3.087     3.087     3.087

libcent 0       178.5     180.3     179.8
libamp  0       120.6     112.9     139.0
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       159.6     233.2     208.0
kozaiamp        180.0     180.0     180.0