Orbit Fit and Astrometric record for 02XD91

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: 02XD91    
# Created Tue Dec 12 02:37:18 2017
# Orbit generated from Bernstein formalism
# Fitting    3 observations of    3
# Arc:  23.73h
# First observation: 2002/12/04
#  Last observation: 2002/12/05
# WARNING Fitting with energy constraint
# WARNING and with gdot fixed = 0
# Chi-squared of fit:     1.71 DOF:    2 RMS:  0.13
# Min/Max residuals:    -0.21    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.666242E-05  3.109262E-02 -1.053225E-06 -3.855730E-03  2.917953E-02  0.000000E+00
# Covariance matrix:
  4.2471E-11  7.6465E-08 -2.0298E-13 -3.3738E-10  1.2275E-08  0.0000E+00
  7.6465E-08  1.4038E-04 -3.7124E-10 -6.1633E-07  2.2440E-05  0.0000E+00
 -2.0298E-13 -3.7124E-10  5.6004E-13 -1.5028E-10 -5.9464E-11  0.0000E+00
 -3.3738E-10 -6.1633E-07 -1.5028E-10  3.3518E-07 -9.8785E-08  0.0000E+00
  1.2275E-08  2.2440E-05 -5.9464E-11 -9.8785E-08  3.5953E-06  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  3.2693E-04
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.477846   83.479741    0.198392    0.024779   -0.960817  2452612.847213
# Heliocentric elements and errors
Epoch:              2452610.5000  =  2002/12/02
Mean Anomaly:          348.72865 +/-   201.357
Argument of Peri:      180.49514 +/-   269.116
Long of Asc Node:      274.64385 +/-     4.399
Inclination:             7.18318 +/-     2.709
Eccentricity:         0.03449105 +/-    0.5759
Semi-Major Axis:     36.46858313 +/-   19.4255
Time of Perihelion: 2455129.0469 +/-  205864.5
Perihelion:          35.21074347 +/-   28.1578
Aphelion:            37.72642279 +/-   29.0676
Period (y)              220.2351 +/-    175.97
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            4.19480790 +/-    0.2530
Ecliptic Y           34.97495624 +/-    2.2118
Ecliptic Z            0.88381590 +/-    0.0574
Ecliptic XDOT        -0.00290472 +/-    0.0009
Ecliptic YDOT         0.00033681 +/-    0.0017
Ecliptic ZDOT        -0.00036145 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   35.23670115 +/-    2.1956
Geocenter to KBO     34.27060246 +/-    2.2270
# Hcoef:  7.61

The following table shows the complete astrometric record for 02XD91. 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 (02XD91) followed by the observatory code and reference code for the source of the astrometry.

2002 12  04.34647  05 31 16.57   +24 45 17.1   22.7R 02XD91    695  Ch0143      
2002 12  04.45220  05 31 15.89   +24 45 16.9         02XD91    695  Ch0143      
2002 12  05.33507  05 31 10.36   +24 45 11.4         02XD91    695  Ch0143      

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    -0.21
  2   0.0003     -9.26    -0.04       0.26     0.24
  3   0.0027    -84.77     0.00      -1.48    -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.

02XD91    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