Orbit Fit and Astrometric record for 24978

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: 24978     
# Created Sun Dec 17 02:36:22 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   30 observations of   30
# Arc:   9.04y
# First observation: 1998/04/28
#  Last observation: 2007/05/12
# Chi-squared of fit:    46.18 DOF:   54 RMS:  0.22
# Min/Max residuals:    -0.51    0.55
# Exact a, adot, b, bdot, g, gdot:
  1.656915E-05  2.399247E-02  1.094183E-06 -1.003127E-03  2.439531E-02  1.035454E-03
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.016781 -129.666921    0.222478    0.000052   -0.987093  2450931.999271
# Heliocentric elements and errors
Epoch:              2450932.5000  =  1998/04/29
Mean Anomaly:           48.58864 +/-     0.000
Argument of Peri:      126.96769 +/-     0.000
Long of Asc Node:       50.43470 +/-     0.000
Inclination:             2.39907 +/-     0.000
Eccentricity:         0.04541507 +/-    0.0000
Semi-Major Axis:     43.22180227 +/-    0.0000
Time of Perihelion: 2436924.2141 +/-       0.0
Perihelion:          41.25888114 +/-    0.0000
Aphelion:            45.18472340 +/-    0.0000
Period (y)              284.1597 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -26.95839961 +/-    0.0000
Ecliptic Y          -32.17473097 +/-    0.0000
Ecliptic Z            0.01207790 +/-    0.0000
Ecliptic XDOT         0.00200046 +/-    0.0000
Ecliptic YDOT        -0.00179952 +/-    0.0000
Ecliptic ZDOT        -0.00011263 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.97578939 +/-    0.0000
Geocenter to KBO     40.99149569 +/-    0.0000
# Hcoef:  7.28

The following table shows the complete astrometric record for 24978. 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 (24978) followed by the observatory code and reference code for the source of the astrometry.

1998 04  28.49854  15 11 35.21   -17 48 50.3   23.4R 24978     568  Ca4825      
1998 04  28.53791  15 11 35.03   -17 48 49.5   23.4R 24978     568  Ca4825      
1998 04  28.57687  15 11 34.83   -17 48 48.7   23.4R 24978     568  Ca4825      
1998 05  01.52047  15 11 20.78   -17 47 54.8   23.4R 24978     568  Ca4825      
1998 05  01.53208  15 11 20.73   -17 47 54.6   23.4R 24978     568  Ca4825      
1998 05  24.37367  15 09 30.24   -17 40 48.5   23.4R 24978     568  Ca4825      
1998 05  24.38186  15 09 30.18   -17 40 48.4   23.4R 24978     568  Ca4825      
1998 06  29.38069  15 07 07.59   -17 31 36.0   23.4R 24978     568  Ca4825      
1998 06  29.44553  15 07 07.38   -17 31 35.2   23.4R 24978     568  Ca4825      
1999 03  14.60617  15 19 49.26   -18 23 43.4   23.5R 24978     568  Ca4825      
1999 03  15.58627  15 19 47.20   -18 23 36.5   23.5R 24978     568  Ca4825      
1999 04  08.55344  15 18 33.42   -18 19 12.1   23.4R 24978     568  Ca4825      
1999 04  08.57589  15 18 33.32   -18 19 11.7   23.4R 24978     568  Ca4825      
2000 06  28.95950  15 18 01.17   -18 21 28.4         24978     950  Cb6395      
2000 06  28.98484  15 18 01.08   -18 21 28.1         24978     950  Cb6395      
2000 06  29.01062  15 18 00.99   -18 21 28.1         24978     950  Cb6395      
2001 04  29.43365  15 28 01.40   -19 01 25.2   22.5R 24978     695  Cd0712      
2001 04  29.46064  15 28 01.27   -19 01 24.8         24978     695  Cd0712      
2001 05  21.45933  15 26 14.01   -18 55 11.6         24978     568  Cd2696      
2001 05  21.50862  15 26 13.77   -18 55 10.8         24978     568  Cd2696      
2001 08  18.98693  15 22 33.88   -18 42 21.0   21.8R 24978     807  Ch2574      
2001 08  19.98520  15 22 35.13   -18 42 26.0         24978     807  Ch2574      
2001 08  20.99251  15 22 36.57   -18 42 31.7         24978     807  Ch2574      
2003 06  01.20599  15 36 30.10   -19 38 16.6   22.2R 24978     807   i2184      
2003 06  02.14031  15 36 25.64   -19 38 01.9         24978     807   i2184      
2003 06  02.20299  15 36 25.35   -19 38 01.2         24978     807   i2184      
2007 05  12.31003  16 00 35.04   -21 06 41.5   23.1R 24978     250  S~06E5      
2007 05  12.31767  16 00 35.01   -21 06 41.4         24978     250  S~06E5      
2007 05  12.37392  16 00 34.73   -21 06 40.6         24978     250  S~06E5      
2007 05  12.38087  16 00 34.69   -21 06 40.5         24978     250  S~06E5      

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    -0.20       0.00     0.55
  2   0.0001      0.00    -0.11       0.00    -0.23
  3   0.0002      0.00    -0.29       0.00    -0.14
  4   0.0083      0.00    -0.05       0.00    -0.16
  5   0.0083      0.00     0.05       0.00    -0.17
  6   0.0708      0.00     0.13       0.00    -0.12
  7   0.0709      0.00    -0.18       0.00    -0.17
  8   0.1694      0.00     0.26       0.00    -0.19
  9   0.1696      0.00    -0.02       0.00    -0.13
 10   0.8764      0.00     0.15       0.00     0.01
 11   0.8791      0.00     0.06       0.00    -0.22
 12   0.9447      0.00     0.20       0.00    -0.07
 13   0.9448      0.00     0.04       0.00     0.01
 14   2.1696      0.00     0.46       0.00     0.23
 15   2.1697      0.00     0.32       0.00     0.24
 16   2.1698      0.00     0.20       0.00    -0.06
 17   3.0032      0.00     0.18       0.00     0.20
 18   3.0033      0.00     0.17       0.00     0.15
 19   3.0635      0.00     0.04       0.00     0.27
 20   3.0637      0.00     0.11       0.00     0.22
 21   3.3087      0.00     0.14       0.00     0.31
 22   3.3114      0.00    -0.51       0.00     0.41
 23   3.3142      0.00     0.08       0.00     0.21
 24   5.0916      0.00     0.14       0.00     0.19
 25   5.0942      0.00    -0.04       0.00     0.25
 26   5.0943      0.00     0.15       0.00    -0.04
 27   9.0371      0.00     0.01       0.00    -0.39
 28   9.0372      0.00     0.12       0.00    -0.39
 29   9.0373      0.00     0.05       0.00    -0.33
 30   9.0373      0.00    -0.04       0.00    -0.32

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.

24978    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.063    43.064    43.063
ecceobj         0.045     0.045     0.045
incobj          2.399     2.399     2.399
qmin           40.269    40.274    40.271
qmax           46.606    46.600    46.616
amean          43.370    43.370    43.370
amin           43.032    43.033    43.028
amax           43.722    43.721    43.723
emean           0.048     0.048     0.048
emin            0.030     0.030     0.030
emax            0.067     0.067     0.067
imean           1.451     1.451     1.451
imin            0.483     0.483     0.483
imax            2.198     2.198     2.198
excite_mean     0.055     0.055     0.055
fracstop        1.000     1.000     1.000
cjmean          3.090     3.090     3.090

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       169.6     169.6     169.6
kozaiamp        179.9     180.0     180.0