Orbit Fit and Astrometric record for 15BN518

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: 15BN518   
# Created Thu Aug 16 01:38:17 2018
# Orbit generated from Bernstein formalism
# Fitting   24 observations of   24
# Arc:   4.99y
# First observation: 2012/12/23
#  Last observation: 2017/12/20
Preliminary a, adot, b, bdot, g, gdot:
   0.000230   0.028075   0.000145  -0.010865   0.028764   0.000000
# Chi-squared of fit:     6.55 DOF:   42 RMS:  0.09
# Min/Max residuals:    -0.23    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.535440E-05  2.747215E-02 -6.230268E-06 -1.063481E-02  2.687185E-02 -3.795293E-03
# Covariance matrix:
  4.3261E-13  3.7882E-14  2.5495E-14 -4.3918E-14  8.7746E-13  9.2332E-13
  3.7882E-14  3.1976E-13  7.5610E-14 -1.1504E-13  8.7613E-13  2.3970E-12
  2.5495E-14  7.5610E-14  1.9817E-13 -9.5145E-14  2.2840E-13  6.3672E-13
 -4.3918E-14 -1.1504E-13 -9.5145E-14  8.1891E-14 -3.6076E-13 -9.7022E-13
  8.7746E-13  8.7613E-13  2.2840E-13 -3.6076E-13  4.1492E-12  7.5380E-12
  9.2332E-13  2.3970E-12  6.3672E-13 -9.7022E-13  7.5380E-12  2.0217E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.171769  113.032646    0.351404    0.130287   -0.906817  2456285.070388
# Heliocentric elements and errors
Epoch:              2456280.5000  =  2012/12/19
Mean Anomaly:          331.87308 +/-     0.022
Argument of Peri:      202.78331 +/-     0.024
Long of Asc Node:      312.26566 +/-     0.000
Inclination:            22.49970 +/-     0.000
Eccentricity:         0.22556932 +/-    0.0003
Semi-Major Axis:     46.68110905 +/-    0.0187
Time of Perihelion: 2465382.3544 +/-       4.5
Perihelion:          36.15128302 +/-    0.0198
Aphelion:            57.21093508 +/-    0.0266
Period (y)              318.9480 +/-      0.19
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -14.44646701 +/-    0.0011
Ecliptic Y           34.88217002 +/-    0.0026
Ecliptic Z            5.28933936 +/-    0.0004
Ecliptic XDOT        -0.00249252 +/-    0.0000
Ecliptic YDOT        -0.00130424 +/-    0.0000
Ecliptic ZDOT        -0.00112736 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.12405153 +/-    0.0024
Geocenter to KBO     37.21366135 +/-    0.0028
# Hcoef:  6.64

The following table shows the complete astrometric record for 15BN518. 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 (15BN518) followed by the observatory code and reference code for the source of the astrometry.

2012 12  23.56961  07 45 42.659  +29 31 20.29  22.4w 15BN518   F51  C~1vYB      
2012 12  23.58407  07 45 42.560  +29 31 20.51  22.5w 15BN518   F51  C~1vYB      
2012 12  23.59845  07 45 42.472  +29 31 20.73  22.6w 15BN518   F51  C~1vYB      
2013 01  16.50932  07 43 17.471  +29 35 24.77  22.2w 15BN518   F51  C~1vYB      
2013 01  16.52380  07 43 17.385  +29 35 24.89  22.4w 15BN518   F51  C~1vYB      
2013 01  16.53830  07 43 17.299  +29 35 25.00  22.3w 15BN518   F51  C~1vYB      
2015 01  18.29709  07 56 21.788  +27 47 16.83  22.4w 15BN518   F51  C~1vYB      
2015 01  18.31035  07 56 21.716  +27 47 16.91  22.6w 15BN518   F51  C~1vYB      
2015 01  18.32365  07 56 21.621  +27 47 17.15  22.7w 15BN518   F51  C~1vYB      
2015 01  18.33698  07 56 21.562  +27 47 17.40  22.7w 15BN518   F51  C~1vYB      
2015 01  20.33160  07 56 09.255  +27 47 35.95  22.3w 15BN518   F51  C~1vYB      
2015 01  20.34351  07 56 09.181  +27 47 36.14  22.2w 15BN518   F51  C~1vYB      
2015 01  20.35545  07 56 09.108  +27 47 36.22  22.2w 15BN518   F51  C~1vYB      
2015 01  20.36742  07 56 09.028  +27 47 36.38  22.2w 15BN518   F51  C~1vYB      
2015 01  22.29567  07 55 57.180  +27 47 53.39  22.5w 15BN518   F51  C~1vYB      
2015 01  22.30754  07 55 57.102  +27 47 53.49  22.3w 15BN518   F51  C~1vYB      
2015 01  22.31944  07 55 57.030  +27 47 53.56  22.4w 15BN518   F51  C~1vYB      
2015 01  22.33135  07 55 56.962  +27 47 53.70  22.2w 15BN518   F51  C~1vYB      
2015 01  27.51201  07 55 25.346  +27 48 34.48  22.7w 15BN518   F51  C~1vYB      
2015 01  27.52364  07 55 25.277  +27 48 34.64  22.3w 15BN518   F51  C~1vYB      
2015 01  27.53527  07 55 25.213  +27 48 34.49  22.7w 15BN518   F51  C~1vYB      
2015 01  27.54694  07 55 25.134  +27 48 34.87  22.5w 15BN518   F51  C~1vYB      
2017 12  20.47350  08 18 20.552  +24 46 51.07  22.5R 15BN518   G37  C~2Uxw      
2017 12  20.51451  08 18 20.346  +24 46 51.59        15BN518   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     0.17       0.00    -0.01
  2   0.0000     -1.31    -0.04      -0.01     0.00
  3   0.0001     -2.48    -0.12      -0.00     0.04
  4   0.0655  -1907.91    -0.05     -93.32     0.04
  5   0.0656  -1909.03     0.02     -93.40     0.07
  6   0.0656  -1910.16     0.10     -93.49     0.09
  7   2.0691   9452.91    -0.09   -4535.78    -0.21
  8   2.0691   9451.96     0.06   -4535.89    -0.23
  9   2.0691   9450.67    -0.12   -4535.91    -0.16
 10   2.0692   9449.86     0.18   -4535.82     0.02
 11   2.0746   9285.77    -0.05   -4550.33    -0.05
 12   2.0747   9284.77    -0.06   -4550.34     0.02
 13   2.0747   9283.80    -0.03   -4550.46    -0.00
 14   2.0747   9282.73    -0.11   -4550.52     0.03
 15   2.0800   9124.94    -0.06   -4565.25     0.05
 16   2.0800   9123.91    -0.12   -4565.36     0.03
 17   2.0801   9122.96    -0.08   -4565.48     0.00
 18   2.0801   9122.04    -0.01   -4565.53     0.05
 19   2.0943   8701.98     0.05   -4609.05    -0.02
 20   2.0943   8701.05     0.06   -4609.08     0.07
 21   2.0944   8700.24     0.20   -4609.40    -0.14
 22   2.0944   8699.14     0.04   -4609.23     0.14
 23   4.9908  29363.23     0.05  -11231.42     0.09
 24   4.9910  29360.32     0.00  -11231.59     0.06

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.

15BN518    quality flag:2

Type:       SCATNEAR  SCATEXTD  SCATNEAR

axisobj        46.641    46.692    46.590
ecceobj         0.223     0.224     0.222
incobj         22.529    22.529    22.529
qmin           35.000    34.948    34.847
qmax           58.325    58.591    58.496
amean          46.456    46.514    46.429
amin           46.034    46.116    46.012
amax           46.982    47.004    46.943
emean           0.226     0.230     0.229
emin            0.208     0.212     0.212
emax            0.243     0.247     0.248
imean          23.802    23.718    23.717
imin           23.298    23.176    23.173
imax           24.350    24.234    24.243
excite_mean     0.463     0.463     0.463
fracstop        1.000     1.000     1.000
cjmean          2.861     2.861     2.861

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       181.8     180.8     180.1
kozaiamp        180.0     179.9     180.0