Orbit Fit and Astrometric record for 02XH91

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: 02XH91    
# Created Mon Oct 23 01:37:22 2017
# Orbit generated from Bernstein formalism
# Fitting   21 observations of   21
# Arc:   9.06y
# First observation: 2002/12/04
#  Last observation: 2011/12/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000445   0.018721  -0.000027   0.001530   0.021080   0.000000
# Chi-squared of fit:    46.57 DOF:   36 RMS:  0.26
# Min/Max residuals:    -1.28    0.48
# Exact a, adot, b, bdot, g, gdot:
  1.304036E-05  1.851431E-02  1.227503E-06  1.514240E-03  2.134764E-02 -2.489484E-04
# Covariance matrix:
  2.9124E-13 -1.0284E-13  5.4998E-15 -5.6278E-15  1.1235E-13 -4.5032E-13
 -1.0284E-13  9.6167E-14 -6.6277E-15  7.3303E-15  1.8085E-14  5.8731E-13
  5.4998E-15 -6.6277E-15  1.5765E-13 -2.6867E-14 -1.8240E-15 -4.4318E-14
 -5.6278E-15  7.3303E-15 -2.6867E-14  8.5254E-15  2.8775E-15  4.9412E-14
  1.1235E-13  1.8085E-14 -1.8240E-15  2.8775E-15  2.4570E-13  2.3166E-13
 -4.5032E-13  5.8731E-13 -4.4318E-14  4.9412E-14  2.3166E-13  3.9595E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.730661  100.906557    0.475978    0.025909   -0.857831  2452612.921443
# Heliocentric elements and errors
Epoch:              2452610.5000  =  2002/12/02
Mean Anomaly:          198.48169 +/-     0.067
Argument of Peri:      184.19873 +/-     0.064
Long of Asc Node:       80.43974 +/-     0.001
Inclination:             4.98232 +/-     0.000
Eccentricity:         0.08229749 +/-    0.0001
Semi-Major Axis:     44.22978631 +/-    0.0037
Time of Perihelion: 2500815.2622 +/-      19.1
Perihelion:          40.58978608 +/-    0.0048
Aphelion:            47.86978655 +/-    0.0052
Period (y)              294.1579 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -8.55589459 +/-    0.0002
Ecliptic Y           46.91402919 +/-    0.0011
Ecliptic Z            1.41478737 +/-    0.0000
Ecliptic XDOT        -0.00233174 +/-    0.0000
Ecliptic YDOT        -0.00049010 +/-    0.0000
Ecliptic ZDOT         0.00019336 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.70881565 +/-    0.0011
Geocenter to KBO     46.84359009 +/-    0.0011
# Hcoef:  5.52

The following table shows the complete astrometric record for 02XH91. 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 (02XH91) followed by the observatory code and reference code for the source of the astrometry.

2002 12  04.42070  06 48 03.97   +24 42 58.1   21.7R 02XH91    695  Ch0143      
2002 12  04.53015  06 48 03.50   +24 42 59.0         02XH91    695  Ch0143      
2002 12  05.41051  06 47 59.83   +24 43 05.0         02XH91    695  Ch0143      
2003 01  30.21185  06 43 40.93   +24 48 30.4   22.3R 02XH91    688  Ch1704      
2003 01  30.29347  06 43 40.57   +24 48 30.7         02XH91    688  Ch1704      
2003 11  23.42341  06 53 28.77   +24 41 17.2   22.0R 02XH91    695  Ck0870      
2003 11  23.49215  06 53 28.53   +24 41 18.1         02XH91    695  Ck0870      
2004 02  27.15632  06 46 50.81   +24 50 01.0   22.1R 02XH91    695  Ck0870      
2004 02  27.26209  06 46 50.56   +24 50 01.1         02XH91    695  Ck0870      
2005 02  09.16872  06 52 23.85   +24 49 01.0   21.5R 02XH91    688  Cm6760      
2005 02  09.28174  06 52 23.42   +24 49 01.7         02XH91    688  Cm6760      
2006 01  30.22163  06 57 46.24   +24 47 19.4   22.0R 02XH91    688  Cq1751      
2006 01  30.34382  06 57 45.75   +24 47 21.3         02XH91    688  Cq1751      
2008 11  08.94680  07 17 27.42   +24 29 09.0   22.8R 02XH91    250  S~06Ab      
2008 11  08.95305  07 17 27.40   +24 29 09.0         02XH91    250  S~06Ab      
2008 11  08.95999  07 17 27.39   +24 29 09.1         02XH91    250  S~06Ab      
2008 11  08.96624  07 17 27.38   +24 29 09.1         02XH91    250  S~06Ab      
2008 11  30.39771  07 16 26.89   +24 32 04.5   21.5R 02XH91    688  C~02MO      
2008 11  30.45446  07 16 26.69   +24 32 05.0         02XH91    688  C~02MO      
2011 12  25.36721  07 28 53.01   +24 23 50.3   22.0R 02XH91    688  C~0bcm      
2011 12  25.41336  07 28 52.81   +24 23 51.1         02XH91    688  C~0bcm      

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     0.14       0.00    -0.02
  2   0.0003     -6.46     0.03       0.37     0.16
  3   0.0027    -56.79     0.24       2.21     0.26
  4   0.1555  -3598.22     0.09      48.72     0.23
  5   0.1557  -3603.13    -0.14      48.65     0.20
  6   0.9692   4418.61    -0.10     288.02    -0.08
  7   0.9694   4415.27    -0.11     288.62     0.36
  8   1.2313  -1027.64    -0.30     340.04    -0.08
  9   1.2316  -1031.04    -0.26     339.86    -0.11
 10   2.1841   3495.13     0.09     668.82    -0.30
 11   2.1844   3489.24    -0.05     668.98    -0.03
 12   3.1562   7878.04     0.06     987.84    -1.28
 13   3.1565   7871.20     0.48     989.06     0.02
 14   5.9316  24103.43    -0.10    1817.44     0.04
 15   5.9316  24103.15    -0.20    1817.40    -0.01
 16   5.9317  24103.00    -0.16    1817.48     0.04
 17   5.9317  24102.86    -0.12    1817.46     0.00
 18   5.9904  23250.06     0.11    1879.71     0.19
 19   5.9905  23247.25     0.23    1879.84     0.19
 20   9.0567  33596.54    -0.06    2889.33    -0.05
 21   9.0568  33593.64     0.10    2889.69     0.26

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.

02XH91    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.108    44.119    44.097
ecceobj         0.084     0.084     0.084
incobj          4.980     4.980     4.980
qmin           39.535    39.580    39.518
qmax           48.654    48.624    48.667
amean          43.973    43.985    43.962
amin           43.607    43.638    43.609
amax           44.335    44.358    44.339
emean           0.079     0.079     0.079
emin            0.062     0.062     0.062
emax            0.098     0.097     0.098
imean           3.042     3.046     3.037
imin            2.248     2.254     2.241
imax            3.729     3.732     3.725
excite_mean     0.096     0.096     0.096
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       189.9     189.6     189.7
kozaiamp        180.0     180.0     179.9