Orbit Fit and Astrometric record for 98WZ24

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: 98WZ24    
# Created Tue Dec 12 02:37:00 2017
# Orbit generated from Bernstein formalism
# Fitting    6 observations of    6
# Arc:  64.91d
# First observation: 1998/11/18
#  Last observation: 1999/01/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.073625   0.000001   0.002921   0.037638   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit:     2.46 DOF:    7 RMS:  0.11
# Min/Max residuals:    -0.20    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.968147E-05  4.045707E-02  7.442768E-07  2.985004E-03  3.216487E-02 -9.237261E-03
# Covariance matrix:
  1.0116E-11  1.8807E-08  7.0352E-13 -4.0183E-11  3.0720E-09 -2.9144E-08
  1.8807E-08  3.7714E-05  1.4214E-09 -8.1940E-08  6.1479E-06 -6.0892E-05
  7.0352E-13  1.4214E-09  4.6879E-13 -5.6862E-12  2.3161E-10 -2.3155E-09
 -4.0183E-11 -8.1940E-08 -5.6862E-12  2.1894E-10 -1.3345E-08  1.3492E-07
  3.0720E-09  6.1479E-06  2.3161E-10 -1.3345E-08  1.0023E-06 -9.9043E-06
 -2.9144E-08 -6.0892E-05 -2.3155E-09  1.3492E-07 -9.9043E-06  1.0301E-04
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.326397   76.907377    0.345973   -0.005477   -0.921649  2451135.943681
# Heliocentric elements and errors
Epoch:              2451130.5000  =  1998/11/13
Mean Anomaly:          341.26983 +/-    17.328
Argument of Peri:       42.52465 +/-     7.884
Long of Asc Node:       80.55503 +/-     0.631
Inclination:             4.23810 +/-     0.644
Eccentricity:         0.41708077 +/-    0.4265
Semi-Major Axis:     49.81856981 +/-   30.0930
Time of Perihelion: 2457812.7766 +/-    1248.8
Perihelion:          29.04020219 +/-   27.5528
Aphelion:            70.59693744 +/-   47.6442
Period (y)              351.6374 +/-    318.61
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            7.59608525 +/-    0.2193
Ecliptic Y           31.09993566 +/-    0.9425
Ecliptic Z           -0.17707923 +/-    0.0055
Ecliptic XDOT        -0.00353253 +/-    0.0006
Ecliptic YDOT         0.00002478 +/-    0.0007
Ecliptic ZDOT         0.00025853 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   32.01465080 +/-    0.9171
Geocenter to KBO     31.08982275 +/-    0.9677
# Hcoef:  8.18

The following table shows the complete astrometric record for 98WZ24. 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 (98WZ24) followed by the observatory code and reference code for the source of the astrometry.

1998 11  18.44295  05 03 14.47   +22 28 13.0   22.5R 98WZ24    695  Ca3208      
1998 11  18.51422  05 03 14.02   +22 28 12.4         98WZ24    695  Ca3208      
1998 11  26.35372  05 02 24.38   +22 27 16.2   22.8R 98WZ24    695  Ca3208      
1998 11  26.49056  05 02 23.47   +22 27 15.0         98WZ24    695  Ca3208      
1999 01  22.29999  04 56 42.94   +22 20 48.9   23.4R 98WZ24    568  Ca5545      
1999 01  22.35412  04 56 42.73   +22 20 48.8         98WZ24    568  Ca5545      

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     0.04       0.00     0.15
  2   0.0002     -6.27    -0.05       0.01     0.08
  3   0.0217   -696.57     0.07      11.66    -0.06
  4   0.0220   -709.24    -0.06      11.71    -0.20
  5   0.1776  -5447.59    -0.14     117.06    -0.03
  6   0.1777  -5450.50     0.14     117.28     0.07

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.

98WZ24    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