Orbit Fit and Astrometric record for 15BW518

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: 15BW518   
# Created Thu Jul 19 01:38:22 2018
# Orbit generated from Bernstein formalism
# Fitting   20 observations of   21
# Arc:   3.59y
# First observation: 2014/05/18
#  Last observation: 2017/12/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000115   0.029452  -0.000033  -0.000498   0.027134   0.000000
# Chi-squared of fit:     9.74 DOF:   34 RMS:  0.12
# Min/Max residuals:    -0.21    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.722719E-05  2.858202E-02 -1.803720E-06 -4.815709E-04  2.611965E-02 -8.519603E-04
# Covariance matrix:
  7.3226E-13 -9.9797E-13  2.3327E-14 -1.0122E-14 -2.1412E-13 -5.9851E-12
 -9.9797E-13  1.9422E-12  2.1077E-14  2.3887E-14 -3.3767E-14  1.1020E-11
  2.3327E-14  2.1077E-14  1.5877E-13 -8.1625E-14 -5.9720E-14 -1.7464E-14
 -1.0122E-14  2.3887E-14 -8.1625E-14  8.4691E-14 -3.3402E-15  1.3471E-13
 -2.1412E-13 -3.3767E-14 -5.9720E-14 -3.3402E-15  4.0674E-13  7.7494E-13
 -5.9851E-12  1.1020E-11 -1.7464E-14  1.3471E-13  7.7494E-13  6.7703E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    9.108516  131.744797   -0.975514   -0.042589    0.266097  2456795.763558
# Heliocentric elements and errors
Epoch:              2456790.5000  =  2014/05/13
Mean Anomaly:          358.85767 +/-     0.086
Argument of Peri:       98.95865 +/-     0.121
Long of Asc Node:       35.75386 +/-     0.004
Inclination:             9.24645 +/-     0.000
Eccentricity:         0.15993537 +/-    0.0001
Semi-Major Axis:     45.27317031 +/-    0.0079
Time of Perihelion: 2457143.5603 +/-      26.6
Perihelion:          38.03238898 +/-    0.0088
Aphelion:            52.51395165 +/-    0.0108
Period (y)              304.6278 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -25.72017980 +/-    0.0006
Ecliptic Y           27.35604264 +/-    0.0007
Ecliptic Z            6.06072677 +/-    0.0002
Ecliptic XDOT        -0.00218726 +/-    0.0000
Ecliptic YDOT        -0.00205814 +/-    0.0000
Ecliptic ZDOT        -0.00006385 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.03436771 +/-    0.0006
Geocenter to KBO     38.28535681 +/-    0.0009
# Hcoef:  6.50

The following table shows the complete astrometric record for 15BW518. 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 (15BW518) followed by the observatory code and reference code for the source of the astrometry.

2014 05  18.26278  09 08 01.171  +25 59 40.93  22.1w 15BW518   F51  C~1vYC      
2014 05  18.26764  09 08 01.177  +25 59 40.98  22.3w 15BW518   F51  C~1vYC      
2014 05  18.27740  09 08 01.197  +25 59 40.34  22.2w 15BW518   F51  C~1vYC      
2015 01  17.41307  09 21 12.492  +25 19 48.60  22.2w 15BW518   F51  C~1vYC      
2015 01  17.57416  09 21 11.641  +25 19 53.09  22.4w 15BW518   F51  C~1vYC      
2015 01  17.58650  09 21 11.570  +25 19 53.51  22.7w 15BW518   F51  C~1vYC      
2015 01  17.59885  09 21 11.509  +25 19 53.84  22.3w 15BW518   F51  C~1vYC      
2015 01  17.61124  09 21 11.440  +25 19 54.15  22.2w 15BW518   F51  C~1vYC      
2015 02  18.34825  09 18 15.377  +25 32 51.06  22.6w 15BW518   F51  C~1vYC      
2015 02  18.36094  09 18 15.290  +25 32 51.50  22.8w 15BW518   F51  C~1vYC      
2015 02  18.37368  09 18 15.258  +25 32 52.05  22.5w 15BW518   F51  C~1vYC      
2015 03  14.26149  09 16 15.441  +25 38 28.77  22.5w 15BW518   F51  C~1vYC      
2015 03  14.27507  09 16 15.383  +25 38 28.95  22.0w 15BW518   F51  C~1vYC      
2015 03  14.28931  09 16 15.328  +25 38 29.13  22.1w 15BW518   F51  C~1vYC      
2015 03  14.30225  09 16 15.261  +25 38 28.99  22.3w 15BW518   F51  C~1vYC      
2015 03  15.24223  09 16 11.221  +25 38 36.53  22.5w 15BW518   F51  C~1vYC      
2015 03  15.25538  09 16 11.185  +25 38 36.60  22.6w 15BW518   F51  C~1vYC      
2015 03  15.26817  09 16 11.118  +25 38 36.68  22.5w 15BW518   F51  C~1vYC      
2015 03  15.28095  09 16 11.066  +25 38 36.74  22.4w 15BW518   F51  C~1vYC      
2017 12  20.48259  09 43 52.066  +23 19 47.59  22.5R 15BW518   G37  C~2Uxw      
2017 12  20.53047  09 43 51.921  +23 19 48.85        15BW518   G37  C~2Uxw      

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     0.02       0.00     0.31
  2   0.0000      0.06 (  -0.11)      0.07 (   0.46)
  3   0.0000      0.51    -0.04      -0.46     0.07
  4   0.6684  10927.12     0.00    1004.10    -0.13
  5   0.6689  10914.72     0.03    1004.68    -0.11
  6   0.6689  10913.67    -0.07    1004.77    -0.06
  7   0.6690  10912.78    -0.01    1004.82    -0.05
  8   0.6690  10911.79    -0.04    1004.82    -0.09
  9   0.7559   8398.06     0.17     988.63    -0.21
 10   0.7559   8396.80    -0.09     988.68    -0.10
 11   0.7560   8396.22     0.32     989.07     0.36
 12   0.8214   6748.80    -0.07     804.09    -0.01
 13   0.8214   6748.00    -0.06     804.02     0.07
 14   0.8214   6747.23     0.02     803.96     0.16
 15   0.8215   6746.41    -0.03     803.55    -0.12
 16   0.8240   6692.07    -0.19     793.80    -0.04
 17   0.8241   6691.59     0.09     793.71     0.01
 18   0.8241   6690.70    -0.05     793.51    -0.05
 19   0.8241   6690.01     0.01     793.35    -0.08
 20   3.5927  31068.74     0.09     503.69     0.04
 21   3.5928  31066.37    -0.09     504.16     0.04

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.

15BW518    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.087    45.112    45.061
ecceobj         0.155     0.156     0.155
incobj          9.240     9.240     9.240
qmin           36.977    36.750    37.074
qmax           53.362    53.639    53.231
amean          44.997    45.028    44.972
amin           44.616    44.653    44.580
amax           45.430    45.457    45.403
emean           0.158     0.160     0.156
emin            0.141     0.140     0.140
emax            0.175     0.181     0.173
imean           8.603     8.687     8.572
imin            7.733     7.727     7.742
imax            9.454     9.670     9.368
excite_mean     0.217     0.220     0.216
fracstop        1.000     1.000     1.000
cjmean          3.056     3.054     3.056

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       181.0     178.6     181.7
kozaiamp        179.9     179.9     180.0