Orbit Fit and Astrometric record for 15BF519

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: 15BF519   
# Created Tue Oct 24 01:38:33 2017
# Orbit generated from Bernstein formalism
# Fitting   23 observations of   23
# Arc:  86.78d
# First observation: 2015/01/21
#  Last observation: 2015/04/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000048   0.060167   0.000050  -0.011801   0.038526   0.000000
# Chi-squared of fit:     7.18 DOF:   40 RMS:  0.10
# Min/Max residuals:    -0.27    0.25
# Exact a, adot, b, bdot, g, gdot:
  2.006159E-05  4.634190E-02 -5.331506E-06 -1.139980E-02  3.623961E-02 -7.447847E-03
# Covariance matrix:
  2.3982E-13 -5.5682E-12 -1.1263E-14 -6.0951E-14 -2.5461E-13  8.5415E-11
 -5.5682E-12  2.7387E-09  1.0250E-11 -5.0926E-11  3.8603E-10 -1.3873E-08
 -1.1263E-14  1.0250E-11  2.1557E-13 -1.2159E-12  1.4905E-12 -4.5552E-11
 -6.0951E-14 -5.0926E-11 -1.2159E-12  1.0365E-11 -8.2240E-12  9.5771E-11
 -2.5461E-13  3.8603E-10  1.4905E-12 -8.2240E-12  5.7322E-11 -1.5263E-09
  8.5415E-11 -1.3873E-08 -4.5552E-11  9.5771E-11 -1.5263E-09  1.4002E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
  -13.588436  153.824711    0.535244   -0.193279   -0.800318  2457044.011568
# Heliocentric elements and errors
Epoch:              2457040.5000  =  2015/01/18
Mean Anomaly:          339.02096 +/-     0.487
Argument of Peri:      265.95969 +/-     1.184
Long of Asc Node:      290.29844 +/-     0.032
Inclination:            19.16558 +/-     0.011
Eccentricity:         0.32762995 +/-    0.0074
Semi-Major Axis:     39.57637620 +/-    0.2518
Time of Perihelion: 2462340.0088 +/-     112.1
Perihelion:          26.60996988 +/-    0.3397
Aphelion:            52.54278252 +/-    0.4455
Period (y)              248.9787 +/-      2.38
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -24.57703104 +/-    0.0050
Ecliptic Y           12.67533539 +/-    0.0025
Ecliptic Z           -6.48329100 +/-    0.0014
Ecliptic XDOT        -0.00087580 +/-    0.0000
Ecliptic YDOT        -0.00347792 +/-    0.0000
Ecliptic ZDOT        -0.00070484 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   28.40295133 +/-    0.0045
Geocenter to KBO     27.59411327 +/-    0.0058
# Hcoef:  7.47

The following table shows the complete astrometric record for 15BF519. 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 (15BF519) followed by the observatory code and reference code for the source of the astrometry.

2015 01  21.51079  10 03 20.188  -02 34 45.73  22.1w 15BF519   F51  C~1vYD      
2015 01  21.52434  10 03 20.109  -02 34 45.73  22.0w 15BF519   F51  C~1vYD      
2015 01  21.53780  10 03 20.030  -02 34 45.65  22.3w 15BF519   F51  C~1vYD      
2015 01  21.55122  10 03 19.946  -02 34 45.45  22.2w 15BF519   F51  C~1vYD      
2015 01  26.45206  10 02 51.028  -02 33 55.80  22.2w 15BF519   F51  C~1vYD      
2015 01  26.46345  10 02 50.946  -02 33 55.47  21.9w 15BF519   F51  C~1vYD      
2015 01  26.47480  10 02 50.864  -02 33 55.48  21.7w 15BF519   F51  C~1vYD      
2015 02  20.41820  10 00 08.316  -02 24 57.77  22.0w 15BF519   F51  C~1vYD      
2015 02  20.43092  10 00 08.220  -02 24 57.29  22.0w 15BF519   F51  C~1vYD      
2015 02  20.44386  10 00 08.130  -02 24 56.97  21.8w 15BF519   F51  C~1vYD      
2015 02  20.45656  10 00 08.060  -02 24 56.63  22.2w 15BF519   F51  C~1vYD      
2015 03  19.35405  09 57 19.178  -02 09 17.72  22.2w 15BF519   F51  C~1vYD      
2015 03  19.36699  09 57 19.115  -02 09 17.26  22.1w 15BF519   F51  C~1vYD      
2015 03  19.37991  09 57 19.044  -02 09 16.72  21.9w 15BF519   F51  C~1vYD      
2015 03  19.39289  09 57 18.969  -02 09 16.28  22.0w 15BF519   F51  C~1vYD      
2015 03  21.37757  09 57 08.110  -02 08 00.30  22.2w 15BF519   F51  C~1vYD      
2015 03  21.39019  09 57 08.040  -02 07 59.97  22.1w 15BF519   F51  C~1vYD      
2015 03  21.40276  09 57 07.976  -02 07 59.43  21.9w 15BF519   F51  C~1vYD      
2015 03  21.41525  09 57 07.892  -02 07 58.90  22.4w 15BF519   F51  C~1vYD      
2015 04  18.25552  09 55 15.186  -01 50 55.23  22.1w 15BF519   F51  C~1vYD      
2015 04  18.26783  09 55 15.147  -01 50 54.77  22.3w 15BF519   F51  C~1vYD      
2015 04  18.28016  09 55 15.104  -01 50 54.33  22.4w 15BF519   F51  C~1vYD      
2015 04  18.29251  09 55 15.098  -01 50 53.84  22.1w 15BF519   F51  C~1vYD      

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     0.03       0.00     0.07
  2   0.0000     -1.11     0.08      -0.42    -0.03
  3   0.0001     -2.24     0.09      -0.77    -0.05
  4   0.0001     -3.49    -0.02      -1.03     0.01
  5   0.0135   -425.95     0.08    -109.53    -0.05
  6   0.0136   -427.21    -0.15    -109.66     0.06
  7   0.0136   -428.35    -0.27    -110.11    -0.14
  8   0.0819  -2895.64     0.16    -479.28     0.01
  9   0.0819  -2897.16    -0.00    -479.35     0.06
 10   0.0820  -2898.53    -0.00    -479.53    -0.01
 11   0.0820  -2899.64     0.25    -479.59     0.05
 12   0.1556  -5600.40    -0.21    -509.56    -0.05
 13   0.1557  -5601.45    -0.05    -509.47    -0.02
 14   0.1557  -5602.64    -0.03    -509.35     0.03
 15   0.1557  -5603.85    -0.03    -509.34    -0.02
 16   0.1612  -5783.17    -0.02    -496.74     0.12
 17   0.1612  -5784.27     0.03    -496.81    -0.02
 18   0.1612  -5785.36     0.09    -496.65     0.06
 19   0.1613  -5786.73    -0.14    -496.61     0.03
 20   0.2375  -7733.07     0.10    -146.56    -0.08
 21   0.2375  -7733.78    -0.01    -146.34    -0.07
 22   0.2376  -7734.54    -0.16    -146.16    -0.10
 23   0.2376  -7734.80     0.18    -145.74     0.12

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.

15BF519    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        39.251    39.711    38.837
ecceobj         0.321     0.335     0.308
incobj         19.175    19.138    19.214
qmin           26.209    25.209    26.498
qmax           55.544    54.567    54.670
amean          39.639    39.644    39.077
amin           38.784    38.779    38.285
amax           41.736    40.404    41.165
emean           0.318     0.343     0.308
emin            0.304     0.330     0.290
emax            0.331     0.358     0.328
imean          21.427    20.824    21.201
imin           20.613    20.391    20.730
imax           22.323    21.250    21.831
excite_mean     0.485     0.494     0.475
fracstop        0.020     0.021     0.023
cjmean          2.784     2.774     2.791

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       287.2     284.5     286.5
kozaiamp         22.9      16.8      23.8