Orbit Fit and Astrometric record for 15FZ561

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: 15FZ561   
# Created Mon Jul  7 01:10:33 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:  65.89d
# First observation: 2015/03/18
#  Last observation: 2015/05/23
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.029555   0.000001   0.000656   0.025203   0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit:     2.85 DOF:     19 RMS:  0.09
# Min/Max residuals:    -0.21    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.482022E-05  2.196387E-02  6.213678E-07  7.749030E-04  2.400446E-02  9.368264E-03
# Covariance matrix:
  9.4749E-13  9.5811E-10  7.6993E-14 -1.5025E-11  1.5208E-10 -1.0557E-08
  9.5811E-10  1.4200E-06  1.1513E-10 -2.2475E-08  2.2060E-07 -1.6869E-05
  7.6993E-14  1.1513E-10  2.0492E-13 -2.9751E-12  1.7862E-11 -1.3739E-09
 -1.5025E-11 -2.2475E-08 -2.9751E-12  3.7438E-10 -3.4868E-09  2.6826E-07
  1.5208E-10  2.2060E-07  1.7862E-11 -3.4868E-09  3.4360E-08 -2.5959E-06
 -1.0557E-08 -1.6869E-05 -1.3739E-09  2.6826E-07 -2.5959E-06  2.0716E-04
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.304533  178.511067    0.020387   -0.022453   -0.991686  2457099.960328
# Heliocentric elements and errors
Epoch:              2457090.5000  =  2015/03/09
Mean Anomaly:           56.64063 +/-    54.360
Argument of Peri:      224.54152 +/-    10.119
Long of Asc Node:      210.89674 +/-     1.779
Inclination:             2.37592 +/-     0.117
Eccentricity:         0.39805782 +/-    0.5849
Semi-Major Axis:     46.13820486 +/-   22.0306
Time of Perihelion: 2439080.4454 +/-   11505.1
Perihelion:          27.77253176 +/-   30.0702
Aphelion:            64.50387796 +/-   40.9512
Period (y)              313.4002 +/-    224.47
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.62827709 +/-    0.3215
Ecliptic Y            1.12815136 +/-    0.0084
Ecliptic Z           -0.94838438 +/-    0.0073
Ecliptic XDOT        -0.00113839 +/-    0.0016
Ecliptic YDOT        -0.00248222 +/-    0.0002
Ecliptic ZDOT         0.00006412 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.65374739 +/-    0.3213
Geocenter to KBO     41.65892011 +/-    0.3217
# Hcoef:  8.36

The following table shows the complete astrometric record for 15FZ561. 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 (15FZ561) followed by the observatory code and reference code for the source of the astrometry.

2015 03  18.45955  11 52 27.63   -00 36 17.1   24.6r 15FZ561   T09  C~8vFX      
2015 03  18.48012  11 52 27.54   -00 36 16.5   24.7r 15FZ561   T09  C~8vFX      
2015 03  18.54052  11 52 27.27   -00 36 14.8   24.7r 15FZ561   T09  C~8vFX      
2015 03  18.57089  11 52 27.13   -00 36 13.9   24.2r 15FZ561   T09  C~8vFX      
2015 03  20.40205  11 52 18.97   -00 35 19.8   24.1i 15FZ561   T09  C~8vFX      
2015 03  20.42657  11 52 18.86   -00 35 19.2   24.1i 15FZ561   T09  C~8vFX      
2015 03  25.51747  11 51 56.19   -00 32 49.0   25.5g 15FZ561   T09  C~8vFX      
2015 03  25.54754  11 51 56.08   -00 32 48.3   26.0g 15FZ561   T09  C~8vFX      
2015 05  23.28008  11 48 43.57   -00 10 24.2   24.1z 15FZ561   T09  C~8vFX      
2015 05  23.29761  11 48 43.54   -00 10 24.2   24.3z 15FZ561   T09  C~8vFX      
2015 05  23.31512  11 48 43.50   -00 10 23.9   24.1z 15FZ561   T09  C~8vFX      
2015 05  23.35010  11 48 43.46   -00 10 23.5   24.4z 15FZ561   T09  C~8vFX      

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    -0.07       0.00    -0.02
     2   0.0001     -1.48    -0.02       0.01    -0.01
     3   0.0002     -5.87     0.06      -0.04    -0.05
     4   0.0003     -8.15     0.03      -0.05    -0.06
     5   0.0053   -141.97    -0.03       0.92     0.11
     6   0.0054   -143.72     0.04       0.81     0.00
     7   0.0193   -515.44    -0.21       3.40     0.03
     8   0.0194   -517.23     0.20       3.39     0.01
     9   0.1802  -3701.59     0.04      88.12     0.13
    10   0.1803  -3702.00     0.07      87.94    -0.08
    11   0.1803  -3702.67    -0.15      87.98    -0.07
    12   0.1804  -3703.38     0.04      88.11     0.00

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.

15FZ561    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