Orbit Fit and Astrometric record for 15BY518

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: 15BY518   
# Created Wed Oct 24 01:10:02 2018
# Orbit generated from Bernstein formalism
# Fitting   36 observations of   37
# Arc:   3.22y
# First observation: 2015/01/19
#  Last observation: 2018/04/10
Preliminary a, adot, b, bdot, g, gdot:
  -0.000010   0.028387  -0.000002   0.007482   0.026571   0.000000
# Chi-squared of fit:     8.98 DOF:   66 RMS:  0.09
# Min/Max residuals:    -0.17    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.679390E-05  2.838447E-02  4.337849E-06  7.477358E-03  2.662586E-02 -2.788764E-03
# Covariance matrix:
  7.9647E-14  1.9028E-13 -4.1945E-15  6.9583E-14  1.4434E-13  2.6959E-12
  1.9028E-13  4.6758E-11 -1.1052E-12  2.0086E-11  1.0148E-11  7.2327E-10
 -4.1945E-15 -1.1052E-12  7.0197E-14 -4.9845E-13 -2.3827E-13 -1.7164E-11
  6.9583E-14  2.0086E-11 -4.9845E-13  8.8176E-12  4.3115E-12  3.1206E-10
  1.4434E-13  1.0148E-11 -2.3827E-13  4.3115E-12  2.4871E-12  1.5579E-10
  2.6959E-12  7.2327E-10 -1.7164E-11  3.1206E-10  1.5579E-10  1.1234E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
  -22.470504  139.636479    0.350581   -0.350408   -0.847630  2457041.974258
# Heliocentric elements and errors
Epoch:              2457040.5000  =  2015/01/18
Mean Anomaly:          339.12994 +/-     0.579
Argument of Peri:      334.90037 +/-     0.989
Long of Asc Node:      194.24665 +/-     0.001
Inclination:            26.14347 +/-     0.000
Eccentricity:         0.22152499 +/-    0.0019
Semi-Major Axis:     47.90491113 +/-    0.0279
Time of Perihelion: 2464061.3492 +/-     194.7
Perihelion:          37.29277636 +/-    0.0952
Aphelion:            58.51704590 +/-    0.0988
Period (y)              331.5723 +/-      0.29
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -26.91942530 +/-    0.0016
Ecliptic Y           23.33825228 +/-    0.0013
Ecliptic Z          -14.35463227 +/-    0.0008
Ecliptic XDOT        -0.00191611 +/-    0.0000
Ecliptic YDOT        -0.00221055 +/-    0.0000
Ecliptic ZDOT         0.00082019 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.41073998 +/-    0.0014
Geocenter to KBO     37.55746617 +/-    0.0022
# Hcoef:  6.28

The following table shows the complete astrometric record for 15BY518. 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 (15BY518) followed by the observatory code and reference code for the source of the astrometry.

2015 01  19.47348  09 00 29.231  -06 27 57.56  22.3w 15BY518   F51  C~1vYC      
2015 01  19.48481  09 00 29.183  -06 27 57.36  22.5w 15BY518   F51  C~1vYC      
2015 01  19.49615  09 00 29.119  -06 27 57.43  22.3w 15BY518   F51  C~1vYC      
2015 01  19.50762  09 00 29.069  -06 27 57.02  22.1w 15BY518   F51  C~1vYC      
2015 01  21.49804  09 00 19.278  -06 27 27.74  22.0w 15BY518   F51  C~1vYC      
2015 01  21.51155  09 00 19.212  -06 27 27.68  22.2w 15BY518   F51  C~1vYC      
2015 01  21.52508  09 00 19.150  -06 27 27.44  21.9w 15BY518   F51  C~1vYC      
2015 01  21.53851  09 00 19.073  -06 27 27.20  21.9w 15BY518   F51  C~1vYC      
2015 01  23.39542  09 00 09.887  -06 26 57.29  22.1w 15BY518   F51  C~1vYC      
2015 01  23.39608  09 00 09.876  -06 26 57.35  22.2w 15BY518   F51  C~1vYC      
2015 01  23.40878  09 00 09.820  -06 26 57.07  22.3w 15BY518   F51  C~1vYC      
2015 01  23.40945  09 00 09.809  -06 26 56.93  22.0w 15BY518   F51  C~1vYC      
2015 01  23.42212  09 00 09.751  -06 26 56.80  21.9w 15BY518   F51  C~1vYC      
2015 01  23.42278  09 00 09.745  -06 26 56.73  22.1w 15BY518   F51  C~1vYC      
2015 01  23.43545  09 00 09.683  -06 26 56.57  22.1w 15BY518   F51  C~1vYC      
2015 01  23.43611  09 00 09.682  -06 26 56.50  22.2w 15BY518   F51  C~1vYC      
2015 01  25.37926  08 59 59.991  -06 26 22.37  22.4w 15BY518   F51  C~1vYC      
2015 01  25.39232  08 59 59.926  -06 26 22.15  22.1w 15BY518   F51  C~1vYC      
2015 01  25.40539  08 59 59.840  -06 26 21.73  22.2w 15BY518   F51  C~1vYC      
2015 01  25.41844  08 59 59.783  -06 26 21.60  22.5w 15BY518   F51  C~1vYC      
2015 02  18.38235  08 57 59.949  -06 15 51.50  22.2w 15BY518   F51  C~1vYC      
2015 02  18.39534  08 57 59.893  -06 15 51.05  22.3w 15BY518   F51  C~1vYC      
2015 02  18.40827  08 57 59.817  -06 15 50.54  22.1w 15BY518   F51  C~1vYC      
2015 02  20.37368  08 57 50.466  -06 14 44.10  22.0w 15BY518   F51  C~1vYC      
2015 02  20.38651  08 57 50.390  -06 14 43.68  22.4w 15BY518   F51  C~1vYC      
2015 02  20.39944  08 57 50.341  -06 14 43.32  22.3w 15BY518   F51  C~1vYC      
2015 02  20.41237  08 57 50.272  -06 14 42.87  22.4w 15BY518   F51  C~1vYC      
2015 03  18.34569  08 56 04.803  -05 57 46.26  22.1w 15BY518   F51  C~1vYC      
2015 03  18.35861  08 56 04.751  -05 57 45.77  22.3w 15BY518   F51  C~1vYC      
2015 03  18.37159  08 56 04.717  -05 57 45.26  22.2w 15BY518   F51  C~1vYC      
2015 03  18.38449  08 56 04.676  -05 57 44.53  22.1w 15BY518   F51  C~1vYC      
2015 03  19.34315  08 56 01.617  -05 57 03.86  21.9w 15BY518   F51  C~1vYC      
2015 03  19.35611  08 56 01.572  -05 57 03.29  22.3w 15BY518   F51  C~1vYC      
2015 03  19.36904  08 56 01.527  -05 57 02.73  22.3w 15BY518   F51  C~1vYC      
2015 03  19.38197  08 56 01.484  -05 57 02.09  22.6w 15BY518   F51  C~1vYC      
2018 04  10.13928  09 15 26.283  -05 56 26.20  22.3R 15BY518   G37              
2018 04  10.23665  09 15 26.244  -05 56 22.55        15BY518   G37              

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     0.01       0.00     0.02
  2   0.0000     -0.74     0.12      -0.03     0.10
  3   0.0001     -1.63     0.08      -0.39    -0.15
  4   0.0001     -2.46     0.11      -0.22     0.12
  5   0.0055   -150.37    -0.13     -16.86     0.10
  6   0.0056   -151.33    -0.06     -17.10    -0.04
  7   0.0056   -152.28     0.01     -17.15     0.02
  8   0.0057   -153.45    -0.13     -17.27     0.00
  9   0.0107   -292.96    -0.00     -30.57    -0.07
 10   0.0107   -293.10    -0.09     -30.68    -0.17
 11   0.0108   -293.98     0.01     -30.67    -0.07
 12   0.0108   -294.18    -0.14     -30.58     0.02
 13   0.0108   -295.04    -0.03     -30.72    -0.03
 14   0.0108   -295.15    -0.08     -30.68     0.01
 15   0.0108   -296.08    -0.04     -30.81    -0.03
 16   0.0108   -296.11    -0.02     -30.75     0.04
 17   0.0162   -444.08     0.13     -42.34     0.00
 18   0.0162   -445.07     0.16     -42.42    -0.01
 19   0.0162   -446.42    -0.17     -42.41     0.08
 20   0.0163   -447.27    -0.00     -42.55     0.02
 21   0.0819  -2340.95    -0.01      11.23     0.01
 22   0.0819  -2341.88     0.09      11.40     0.06
 23   0.0820  -2343.11    -0.12      11.54     0.08
 24   0.0873  -2496.21     0.21      32.09     0.00
 25   0.0874  -2497.42     0.02      32.15    -0.08
 26   0.0874  -2498.22     0.24      32.27    -0.10
 27   0.0874  -2499.34     0.14      32.38    -0.12
 28   0.1584  -4308.86     0.03     517.76     0.07
 29   0.1585  -4309.75    -0.08     517.99    -0.03
 30   0.1585  -4310.39     0.06     518.32    -0.03
 31   0.1586  -4311.20     0.03     518.83     0.15
 32   0.1612  -4367.15    -0.01     543.53    -0.01
 33   0.1612  -4367.96    -0.06     543.86    -0.01
 34   0.1612  -4368.77    -0.11     544.19    -0.02
 35   0.1613  -4369.58    -0.15     544.60     0.06
 36   3.2215  12200.92     0.00    5846.37    -0.01
 37   3.2218  12199.27 (   2.00)   5849.69 (   0.11)

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.

15BY518    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        47.631    47.652    47.615
ecceobj         0.215     0.219     0.214
incobj         26.173    26.174    26.173
qmin           35.761    36.524    35.363
qmax           60.936    60.086    61.332
amean          47.796    47.797    47.835
amin           47.122    47.119    47.114
amax           48.574    48.538    48.568
emean           0.236     0.205     0.227
emin            0.208     0.177     0.183
emax            0.255     0.238     0.263
imean          25.947    26.481    26.183
imin           25.585    25.983    25.415
imax           26.305    26.806    27.025
excite_mean     0.497     0.491     0.496
fracstop        1.000     1.000     1.000
cjmean          2.831     2.837     2.832

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       177.6     181.9     184.2
kozaiamp        180.0     180.0     180.0