Orbit Fit and Astrometric record for 15FZ494

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: 15FZ494   
# Created Tue Apr  1 01:10:22 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:  10.94d
# First observation: 2015/03/18
#  Last observation: 2015/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.037098   0.000001   0.017512   0.029975   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after  14 iterations -- oscilliatory solution
# Chi-squared of fit:     5.09 DOF:     31 RMS:  0.09
# Min/Max residuals:    -0.22    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.171825E-05  2.075387E-02  1.078102E-05  1.753145E-02  2.738824E-02  1.003454E-02
# Covariance matrix:
  2.2783E-10  3.9428E-07  1.9890E-12 -4.8413E-10  6.2386E-08 -4.5652E-07
  3.9428E-07  6.8297E-04  3.4494E-09 -8.4084E-07  1.0806E-04 -7.9503E-04
  1.9890E-12  3.4494E-09  1.9821E-13 -1.1505E-11  5.4561E-10 -4.2249E-09
 -4.8413E-10 -8.4084E-07 -1.1505E-11  1.6106E-09 -1.3296E-07  1.0912E-06
  6.2386E-08  1.0806E-04  5.4561E-10 -1.3296E-07  1.7097E-05 -1.2563E-04
 -4.5652E-07 -7.9503E-04 -4.2249E-09  1.0912E-06 -1.2563E-04  1.1397E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.871933  179.511481    0.037652   -0.014958   -0.991323  2457099.963238
# Heliocentric elements and errors
Epoch:              2457090.5000  =  2015/03/09
Mean Anomaly:           59.29091 +/-    51.166
Argument of Peri:      258.58966 +/-   125.792
Long of Asc Node:      180.46142 +/-     1.253
Inclination:            40.09846 +/-    35.425
Eccentricity:         0.35206803 +/-    1.2101
Semi-Major Axis:     40.17164048 +/-   16.0195
Time of Perihelion: 2441773.8640 +/-    9527.3
Perihelion:          26.02849022 +/-   49.7089
Aphelion:            54.31479074 +/-   53.2200
Period (y)              254.6171 +/-    152.30
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.50067319 +/-    5.5115
Ecliptic Y            0.35738220 +/-    0.0475
Ecliptic Z           -0.55521384 +/-    0.0838
Ecliptic XDOT        -0.00105072 +/-    0.0035
Ecliptic YDOT        -0.00207157 +/-    0.0023
Ecliptic ZDOT         0.00173714 +/-    0.0002
# Distances at JD0 (AU)
Heliocenter to KBO   37.50648576 +/-    5.5106
Geocenter to KBO     36.51201546 +/-    5.5123
# Hcoef:  8.05

The following table shows the complete astrometric record for 15FZ494. 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 (15FZ494) followed by the observatory code and reference code for the source of the astrometry.

2015 03  18.46246  11 56 49.19   -00 36 20.4   23.3r 15FZ494   T09  C~8iai      
2015 03  18.48012  11 56 49.10   -00 36 19.5   23.3r 15FZ494   T09  C~8iai      
2015 03  18.49910  11 56 49.01   -00 36 18.7   23.5r 15FZ494   T09  C~8iai      
2015 03  18.53831  11 56 48.81   -00 36 17.0   23.5r 15FZ494   T09  C~8iai      
2015 03  18.56877  11 56 48.64   -00 36 15.5   23.7r 15FZ494   T09  C~8iai      
2015 03  20.40558  11 56 39.50   -00 34 56.4   23.1i 15FZ494   T09  C~8iai      
2015 03  20.42657  11 56 39.39   -00 34 55.5   23.0i 15FZ494   T09  C~8iai      
2015 03  20.46619  11 56 39.19   -00 34 53.7   23.2i 15FZ494   T09  C~8iai      
2015 03  20.54104  11 56 38.82   -00 34 50.5   23.5i 15FZ494   T09  C~8iai      
2015 03  25.45755  11 56 14.34   -00 31 17.9   24.8g 15FZ494   T09  C~8iai      
2015 03  25.51534  11 56 14.04   -00 31 15.6   24.7g 15FZ494   T09  C~8iai      
2015 03  25.54542  11 56 13.89   -00 31 14.4   25.5g 15FZ494   T09  C~8iai      
2015 03  29.31803  11 55 55.28   -00 28 32.0   23.2y 15FZ494   T09  C~8iai      
2015 03  29.33718  11 55 55.20   -00 28 31.0   23.6y 15FZ494   T09  C~8iai      
2015 03  29.38505  11 55 54.95   -00 28 28.9   23.5y 15FZ494   T09  C~8iai      
2015 03  29.39585  11 55 54.90   -00 28 28.6   23.2y 15FZ494   T09  C~8iai      
2015 03  29.40401  11 55 54.86   -00 28 28.3   23.3y 15FZ494   T09  C~8iai      
2015 03  29.40670  11 55 54.86   -00 28 28.3   23.2y 15FZ494   T09  C~8iai      

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     0.05       0.00    -0.14
     2   0.0000     -1.60    -0.00       0.29    -0.01
     3   0.0001     -3.15     0.09       0.49     0.01
     4   0.0002     -6.58     0.07       0.85     0.01
     5   0.0003     -9.52    -0.22       1.21     0.09
     6   0.0053   -166.76     0.01      19.25    -0.03
     7   0.0054   -168.63    -0.04      19.42    -0.06
     8   0.0055   -172.10    -0.05      19.88     0.03
     9   0.0057   -178.47     0.10      20.61     0.06
    10   0.0192   -599.92    -0.00      69.60     0.21
    11   0.0193   -604.96    -0.04      69.92    -0.02
    12   0.0194   -607.51     0.02      70.12    -0.10
    13   0.0297   -928.22    -0.11     108.08    -0.13
    14   0.0298   -929.72     0.03     108.52     0.13
    15   0.0299   -933.99    -0.14     108.95     0.11
    16   0.0299   -934.80    -0.02     108.93    -0.02
    17   0.0300   -935.47     0.01     108.96    -0.06
    18   0.0300   -935.47     0.24     108.96    -0.09

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.

15FZ494    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