Orbit Fit and Astrometric record for 15FT490

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: 15FT490   
# Created Tue Apr  1 01:10:22 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:  10.93d
# First observation: 2015/03/18
#  Last observation: 2015/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.031243   0.000001   0.000863   0.025235   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# Chi-squared of fit:     8.19 DOF:     25 RMS:  0.13
# Min/Max residuals:    -0.23    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.340582E-05  2.061419E-02  1.214705E-06  8.578898E-04  2.355456E-02  1.031821E-02
# Covariance matrix:
  3.1885E-10  4.7578E-07 -1.2970E-12  2.4848E-10  7.5288E-08 -6.0811E-07
  4.7578E-07  7.1047E-04 -1.9366E-09  3.7098E-07  1.1242E-04 -9.0998E-04
 -1.2970E-12 -1.9366E-09  2.1360E-13 -9.3039E-12 -3.0645E-10  2.4743E-09
  2.4848E-10  3.7098E-07 -9.3039E-12  8.1694E-10  5.8705E-08 -4.7185E-07
  7.5288E-08  1.1242E-04 -3.0645E-10  5.8705E-08  1.7789E-05 -1.4392E-04
 -6.0811E-07 -9.0998E-04  2.4743E-09 -4.7185E-07 -1.4392E-04  1.2929E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.894387  179.951315    0.044747    0.015598   -0.991025  2457099.992668
# Heliocentric elements and errors
Epoch:              2457090.5000  =  2015/03/09
Mean Anomaly:           56.65193 +/-    68.113
Argument of Peri:      270.54792 +/-   186.313
Long of Asc Node:      159.80161 +/-    23.685
Inclination:             2.54288 +/-     2.879
Eccentricity:         0.44982985 +/-    1.6590
Semi-Major Axis:     46.26701917 +/-   22.9254
Time of Perihelion: 2439001.3612 +/-   17095.2
Perihelion:          25.45473300 +/-   77.7857
Aphelion:            67.07930534 +/-   83.6438
Period (y)              314.7136 +/-    233.91
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -43.44367872 +/-    7.6011
Ecliptic Y            0.08152503 +/-    0.0071
Ecliptic Z            0.66275928 +/-    0.1187
Ecliptic XDOT        -0.00120308 +/-    0.0044
Ecliptic YDOT        -0.00240083 +/-    0.0027
Ecliptic ZDOT         0.00011851 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   43.44881031 +/-    7.6002
Geocenter to KBO     42.45463348 +/-    7.6021
# Hcoef:  8.13

The following table shows the complete astrometric record for 15FT490. 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 (15FT490) followed by the observatory code and reference code for the source of the astrometry.

2015 03  18.49189  12 01 14.67   +00 50 23.8   24.6r 15FT490   T09  C~8eRi      
2015 03  18.50997  12 01 14.59   +00 50 24.3   25.0r 15FT490   T09  C~8eRi      
2015 03  18.54922  12 01 14.41   +00 50 25.6   24.3r 15FT490   T09  C~8eRi      
2015 03  18.57737  12 01 14.29   +00 50 26.3   24.3r 15FT490   T09  C~8eRi      
2015 03  20.44069  12 01 06.08   +00 51 21.2   24.4i 15FT490   T09  C~8eRi      
2015 03  20.47450  12 01 05.94   +00 51 22.1   24.4i 15FT490   T09  C~8eRi      
2015 03  20.51900  12 01 05.74   +00 51 23.3   24.3i 15FT490   T09  C~8eRi      
2015 03  20.55475  12 01 05.57   +00 51 24.4   23.7i 15FT490   T09  C~8eRi      
2015 03  25.52597  12 00 43.69   +00 53 48.9   25.7g 15FT490   T09  C~8eRi      
2015 03  25.55185  12 00 43.59   +00 53 49.7   25.5g 15FT490   T09  C~8eRi      
2015 03  29.30183  12 00 27.19   +00 55 38.2   24.3y 15FT490   T09  C~8iai      
2015 03  29.32074  12 00 27.10   +00 55 38.3   23.1y 15FT490   T09  C~8iai      
2015 03  29.33991  12 00 27.03   +00 55 39.0   23.5y 15FT490   T09  C~8iai      
2015 03  29.41284  12 00 26.71   +00 55 41.0   23.7y 15FT490   T09  C~8iai      
2015 03  29.42373  12 00 26.65   +00 55 41.4   23.8y 15FT490   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     0.09       0.00    -0.13
     2   0.0000     -1.30     0.11      -0.02    -0.15
     3   0.0002     -4.29    -0.01       0.10    -0.04
     4   0.0002     -6.22     0.12       0.03    -0.12
     5   0.0053   -141.04    -0.23       1.41     0.21
     6   0.0054   -143.32    -0.04       1.40     0.20
     7   0.0055   -146.55    -0.01       1.31     0.10
     8   0.0056   -149.33    -0.17       1.30     0.09
     9   0.0193   -507.89     0.03       3.33    -0.15
    10   0.0193   -509.58     0.22       3.47    -0.01
    11   0.0296   -778.42    -0.16       5.18     0.24
    12   0.0296   -779.70    -0.07       4.73    -0.20
    13   0.0297   -780.94     0.07       4.96     0.02
    14   0.0299   -786.14     0.15       4.88    -0.04
    15   0.0299   -787.12    -0.05       4.89    -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.

15FT490    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