Orbit Fit and Astrometric record for 15FZ431

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: 15FZ431   
# Created Tue Apr  1 01:10:21 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:  95.84d
# First observation: 2015/03/17
#  Last observation: 2015/06/21
Preliminary a, adot, b, bdot, g, gdot:
  -0.000006   0.018120  -0.000017  -0.002726   0.018572   0.000000
# Chi-squared of fit:     4.16 DOF:     10 RMS:  0.13
# Min/Max residuals:    -0.19    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.252861E-05  1.366322E-02 -4.077260E-06 -3.132572E-03  1.787674E-02  6.907912E-03
# Covariance matrix:
  4.9973E-13  8.2816E-12 -3.0809E-14  7.0685E-13  2.3527E-12  7.5887E-11
  8.2816E-12  1.0299E-08 -3.6443E-11  9.7844E-10  1.4453E-09 -1.6184E-07
 -3.0809E-14 -3.6443E-11  4.8307E-13 -5.2294E-12 -5.0906E-12  5.8188E-10
  7.0685E-13  9.7844E-10 -5.2294E-12  1.1175E-10  1.3584E-10 -1.5829E-08
  2.3527E-12  1.4453E-09 -5.0906E-12  1.3584E-10  2.0971E-10 -2.1136E-08
  7.5887E-11 -1.6184E-07  5.8188E-10 -1.5829E-08 -2.1136E-08  2.9492E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.740954 -164.335599    0.328528    0.142354   -0.924987  2457098.946658
# Heliocentric elements and errors
Epoch:              2457090.5000  =  2015/03/09
Mean Anomaly:           51.26466 +/-    10.410
Argument of Peri:       41.91920 +/-     2.413
Long of Asc Node:       48.78513 +/-     0.228
Inclination:            15.33497 +/-     0.089
Eccentricity:         0.44867541 +/-    0.1064
Semi-Major Axis:     63.65519275 +/-    7.0523
Time of Perihelion: 2430674.6386 +/-    3083.0
Perihelion:          35.09467302 +/-    7.8094
Aphelion:            92.21571248 +/-   12.2574
Period (y)              507.8775 +/-     84.40
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -54.22824597 +/-    0.0431
Ecliptic Y          -14.86473564 +/-    0.0121
Ecliptic Z            8.50062759 +/-    0.0069
Ecliptic XDOT        -0.00051547 +/-    0.0003
Ecliptic YDOT        -0.00232261 +/-    0.0001
Ecliptic ZDOT        -0.00031332 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   56.86759794 +/-    0.0413
Geocenter to KBO     55.93860481 +/-    0.0453
# Hcoef:  8.05

The following table shows the complete astrometric record for 15FZ431. 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 (15FZ431) followed by the observatory code and reference code for the source of the astrometry.

2015 03  17.44588  13 11 08.650  +01 54 24.52  25.5r 15FZ431   568  C~444Y      
2015 03  17.54322  13 11 08.329  +01 54 26.26        15FZ431   568  C~444Y      
2015 03  17.61735  13 11 08.099  +01 54 27.68        15FZ431   568  C~444Y      
2015 04  18.17995  13 09 20.776  +02 05 00.65        15FZ431   304  C~444Y      
2015 04  18.24185  13 09 20.538  +02 05 01.46  25.5r 15FZ431   304  C~444Y      
2015 04  19.25957  13 09 17.060  +02 05 19.21        15FZ431   304  C~444Y      
2015 06  20.36231  13 06 48.294  +02 11 59.53        15FZ431   568  C~444Y      
2015 06  21.28847  13 06 47.516  +02 11 53.74        15FZ431   568  C~444Y      

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    -0.09       0.00     0.27
     2   0.0003     -5.11    -0.05      -0.24    -0.09
     3   0.0005     -8.84     0.14      -0.25    -0.19
     4   0.0869  -1737.50     0.12     -31.91     0.18
     5   0.0871  -1741.10    -0.09     -32.53    -0.19
     6   0.0898  -1796.06    -0.04     -36.10     0.01
     7   0.2599  -4009.86     0.10    -519.90     0.03
     8   0.2624  -4018.43    -0.09    -529.71    -0.03

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.

15FZ431    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0