Orbit Fit and Astrometric record for 15BF518

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: 15BF518   
# Created Wed Oct 18 01:38:33 2017
# Orbit generated from Bernstein formalism
# Fitting   11 observations of   11
# Arc:  57.90d
# First observation: 2015/01/19
#  Last observation: 2015/03/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.091474  -0.000000   0.005063   0.056383   0.000000
# Chi-squared of fit:     2.16 DOF:   16 RMS:  0.08
# Min/Max residuals:    -0.18    0.13
# Exact a, adot, b, bdot, g, gdot:
  2.527988E-05  9.130656E-02  9.818482E-07  5.064643E-03  5.630844E-02 -1.495245E-02
# Covariance matrix:
  5.7041E-13  3.3724E-10  1.7683E-13 -7.8604E-13  7.4098E-11  2.7706E-09
  3.3724E-10  1.4498E-06  6.2680E-10 -1.1554E-08  2.4998E-07  1.7737E-06
  1.7683E-13  6.2680E-10  4.9201E-13 -6.2013E-12  1.0982E-10  1.0288E-09
 -7.8604E-13 -1.1554E-08 -6.2013E-12  1.2933E-10 -1.8825E-09  2.3336E-09
  7.4098E-11  2.4998E-07  1.0982E-10 -1.8825E-09  4.4005E-08  4.4105E-07
  2.7706E-09  1.7737E-06  1.0288E-09  2.3336E-09  4.4105E-07  2.2457E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -15.388822  146.069882    0.450872   -0.231317   -0.841056  2457041.991518
# Heliocentric elements and errors
Epoch:              2457040.5000  =  2015/01/18
Mean Anomaly:          337.87658 +/-     3.834
Argument of Peri:      325.45960 +/-     9.257
Long of Asc Node:      223.17527 +/-     0.272
Inclination:            14.95463 +/-     0.016
Eccentricity:         0.33135910 +/-    0.0421
Semi-Major Axis:     25.85682358 +/-    0.8771
Time of Perihelion: 2459991.7838 +/-     488.9
Perihelion:          17.28892974 +/-    1.2370
Aphelion:            34.42471742 +/-    1.5968
Period (y)              131.4834 +/-      6.69
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -14.68220128 +/-    0.0529
Ecliptic Y           10.41889656 +/-    0.0356
Ecliptic Z           -4.71276682 +/-    0.0176
Ecliptic XDOT        -0.00195455 +/-    0.0002
Ecliptic YDOT        -0.00404372 +/-    0.0001
Ecliptic ZDOT         0.00043045 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   18.60996000 +/-    0.0465
Geocenter to KBO     17.75932617 +/-    0.0662
# Hcoef:  9.62

The following table shows the complete astrometric record for 15BF518. 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 (15BF518) followed by the observatory code and reference code for the source of the astrometry.

2015 01  19.49074  09 32 38.496  -01 41 04.87  22.2w 15BF518   F51  C~1vYA      
2015 01  19.50208  09 32 38.383  -01 41 04.70  22.4w 15BF518   F51  C~1vYA      
2015 01  19.51357  09 32 38.289  -01 41 04.48  22.5w 15BF518   F51  C~1vYA      
2015 01  21.50211  09 32 21.048  -01 40 18.66  22.4w 15BF518   F51  C~1vYA      
2015 01  21.51567  09 32 20.935  -01 40 18.29  22.6w 15BF518   F51  C~1vYA      
2015 01  21.52912  09 32 20.808  -01 40 17.98  22.6w 15BF518   F51  C~1vYA      
2015 01  21.54255  09 32 20.677  -01 40 17.44  22.5w 15BF518   F51  C~1vYA      
2015 03  18.35064  09 24 06.439  -00 52 03.89  22.3w 15BF518   F51  C~1vYA      
2015 03  18.36357  09 24 06.341  -00 52 03.10  22.4w 15BF518   F51  C~1vYA      
2015 03  18.37655  09 24 06.242  -00 52 02.23  22.2w 15BF518   F51  C~1vYA      
2015 03  18.38947  09 24 06.166  -00 52 01.34  22.5w 15BF518   F51  C~1vYA      

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     0.07       0.00     0.09
  2   0.0000     -1.66    -0.09      -0.40    -0.05
  3   0.0001     -3.06     0.01      -0.66    -0.04
  4   0.0055   -262.19     0.02     -42.77    -0.07
  5   0.0055   -263.91     0.13     -42.98     0.01
  6   0.0056   -265.81     0.04     -43.31    -0.04
  7   0.0056   -267.85    -0.18     -43.45     0.10
  8   0.1584  -8223.76     0.07     236.93     0.08
  9   0.1584  -8225.41    -0.01     237.19    -0.03
 10   0.1585  -8227.10    -0.13     237.52    -0.07
 11   0.1585  -8228.47     0.06     237.98     0.02

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.

15BF518    quality flag:1

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        25.740    32.587    22.712
ecceobj         0.325     0.444     0.322
incobj         14.931    14.934    14.935
qmin           17.193    18.132    15.260
qmax           34.733    47.042    30.847
amean          25.890    32.587    23.097
amin           25.580    32.587    22.712
amax           26.088    32.587    23.501
emean           0.329     0.444     0.316
emin            0.325     0.444     0.307
emax            0.333     0.444     0.328
imean          15.631    15.701    15.810
imin           15.585    15.701    15.647
imax           15.719    15.701    15.916
excite_mean     0.426     0.520     0.417
fracstop        0.001     0.000     0.001
cjmean          2.854     2.724     2.908

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       327.2     288.6      92.4
kozaiamp          1.6       0.0     179.4