Orbit Fit and Astrometric record for 98UR43

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: 98UR43    
# Created Fri Oct 19 01:07:31 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   38 observations of   38
# Arc:  19.17y
# First observation: 1998/10/22
#  Last observation: 2017/12/23
# Chi-squared of fit:   165.13 DOF:   70 RMS:  0.37
# Min/Max residuals:    -0.92    0.94
# Exact a, adot, b, bdot, g, gdot:
  1.947915E-05  3.863423E-02  3.752763E-06  5.672455E-03  3.232885E-02 -4.208414E-03
# Covariance matrix:
  1.3573E-13 -2.1865E-14  3.9246E-15 -3.0446E-15  1.0420E-13 -2.6299E-14
 -2.1865E-14  7.9463E-15 -1.7539E-15  1.1574E-15 -1.2673E-14  9.3127E-15
  3.9246E-15 -1.7539E-15  6.1935E-14 -4.8677E-15  2.4442E-15 -2.2351E-15
 -3.0446E-15  1.1574E-15 -4.8677E-15  9.3790E-16 -2.6372E-15  1.5297E-15
  1.0420E-13 -1.2673E-14  2.4442E-15 -2.6372E-15  1.8852E-13 -2.5279E-14
 -2.6299E-14  9.3127E-15 -2.2351E-15  1.5297E-15 -2.5279E-14  1.2525E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.743705   36.589832    0.129775   -0.047131   -0.978698  2451108.856041
# Heliocentric elements and errors
Epoch:              2451108.5000  =  1998/10/22
Mean Anomaly:          337.73259 +/-     0.001
Argument of Peri:       17.55567 +/-     0.002
Long of Asc Node:       53.90778 +/-     0.000
Inclination:             8.74983 +/-     0.000
Eccentricity:         0.22524720 +/-    0.0001
Semi-Major Axis:     39.80353804 +/-    0.0521
Time of Perihelion: 2456781.9624 +/-     169.0
Perihelion:          30.83790272 +/-    0.0405
Aphelion:            48.76917335 +/-    0.0639
Period (y)              251.1254 +/-      0.49
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           25.67977985 +/-    0.0004
Ecliptic Y           18.89636678 +/-    0.0003
Ecliptic Z           -1.48054658 +/-    0.0000
Ecliptic XDOT        -0.00221792 +/-    0.0000
Ecliptic YDOT         0.00243763 +/-    0.0000
Ecliptic ZDOT         0.00049686 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   31.91739223 +/-    0.0004
Geocenter to KBO     30.93222496 +/-    0.0005
# Hcoef:  8.30

The following table shows the complete astrometric record for 98UR43. 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 (98UR43) followed by the observatory code and reference code for the source of the astrometry.

1998 10  22.35531  02 20 42.94   +11 07 23.2   22.6R 98UR43    695  Ca3120      
1998 10  22.48840  02 20 42.12   +11 07 19.8         98UR43    695  Ca3120      
1998 11  18.08203  02 18 02.92   +10 55 37.9         98UR43    695  Ca3120      
1998 11  18.15126  02 18 02.53   +10 55 36.5         98UR43    695  Ca3120      
1998 11  18.23630  02 18 02.09   +10 55 33.9         98UR43    695  Ca3120      
1998 12  17.84887  02 15 42.56   +10 46 54.6         98UR43    950  Ca3601      
1998 12  17.88315  02 15 42.46   +10 46 54.2         98UR43    950  Ca3601      
1998 12  18.82521  02 15 39.24   +10 46 45.1   21.9R 98UR43    950  Ca3601      
1998 12  18.87145  02 15 39.11   +10 46 44.8   20.6R 98UR43    950  Ca3601      
1999 10  10.49534  02 30 04.54   +12 14 19.2   22.9R 98UR43    568  Ca7321      
1999 10  10.56097  02 30 04.18   +12 14 18.1   23.1R 98UR43    568  Ca7321      
1999 11  09.47782  02 27 04.96   +12 01 04.4   23.0R 98UR43    568  Ca7321      
1999 11  09.50362  02 27 04.78   +12 01 03.9   22.9R 98UR43    568  Ca7321      
1999 11  11.07703  02 26 55.25   +12 00 23.6         98UR43    829  Cb7501      
1999 11  11.14671  02 26 54.79   +12 00 21.8         98UR43    829  Cb7501      
1999 11  13.14409  02 26 42.80   +11 59 31.0         98UR43    829  Cb7501      
1999 11  13.25619  02 26 42.03   +11 59 28.7         98UR43    829  Cb7501      
2000 01  02.10456  02 23 02.33   +11 46 34.2   23.3R 98UR43    697  Ca9905      
2000 01  02.14873  02 23 02.26   +11 46 33.7   23.2R 98UR43    697  Ca9905      
2000 01  03.10676  02 23 00.37   +11 46 32.3   23.4R 98UR43    697  Ca9905      
2000 01  04.08322  02 22 58.46   +11 46 30.1         98UR43    697  Ca9905      
2000 01  05.07674  02 22 56.71   +11 46 29.1   23.5R 98UR43    697  Ca9905      
2000 01  05.19167  02 22 56.54   +11 46 29.1   23.0R 98UR43    697  Ca9905      
2002 11  05.40671  02 52 47.62   +15 05 01.8   22.5R 98UR43    568  Cl8244      
2002 11  05.46377  02 52 47.24   +15 05 00.3         98UR43    568  Cl8244      
2002 11  06.47599  02 52 40.80   +15 04 35.8         98UR43    568  Cl8244      
2008 10  22.31382  03 48 26.77   +20 45 47.5   23.7r 98UR43    695  C~0gLs      
2008 10  22.40255  03 48 26.30   +20 45 46.0   23.9r 98UR43    695  C~0gLs      
2008 10  24.38528  03 48 14.90   +20 45 19.8   23.4r 98UR43    695  C~0gLs      
2008 10  24.50241  03 48 14.24   +20 45 18.0   23.7r 98UR43    695  C~0gLs      
2008 11  21.72180  03 45 11.84   +20 37 37.7   24.4R 98UR43    250  S~06AK      
2008 11  21.72805  03 45 11.80   +20 37 37.6         98UR43    250  S~06AK      
2008 11  21.73499  03 45 11.75   +20 37 37.5         98UR43    250  S~06AK      
2008 11  21.74194  03 45 11.71   +20 37 37.3         98UR43    250  S~06AK      
2016 02  04.17039  04 47 35.69   +25 41 53.5   23.0R 98UR43    G37  C~1lut      
2016 02  04.30150  04 47 35.36   +25 41 52.6         98UR43    G37  C~1lut      
2017 12  23.33062  05 11 56.046  +26 57 12.37  22.9w 98UR43    568  C~2WWz      
2017 12  23.34501  05 11 55.948  +26 57 12.31  22.8w 98UR43    568  C~2WWz      

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     0.02       0.00    -0.21
  2   0.0004      0.00    -0.13       0.00     0.10
  3   0.0732      0.00    -0.92       0.00     0.60
  4   0.0734      0.00    -0.79       0.00     0.83
  5   0.0736      0.00    -0.02       0.00     0.23
  6   0.1547      0.00    -0.54       0.00     0.27
  7   0.1548      0.00    -0.21       0.00     0.22
  8   0.1573      0.00    -0.36       0.00     0.40
  9   0.1575      0.00     0.09       0.00     0.54
 10   0.9668      0.00    -0.04       0.00    -0.09
 11   0.9670      0.00     0.13       0.00     0.49
 12   1.0489      0.00     0.76       0.00    -0.14
 13   1.0490      0.00     0.45       0.00     0.03
 14   1.0533      0.00     0.46       0.00    -0.15
 15   1.0535      0.00    -0.01       0.00    -0.18
 16   1.0590      0.00     0.71       0.00    -0.46
 17   1.0593      0.00    -0.59       0.00     0.07
 18   1.1958      0.00     0.23       0.00    -0.29
 19   1.1959      0.00     0.61       0.00    -0.68
 20   1.1985      0.00     0.94       0.00     0.06
 21   1.2012      0.00    -0.12       0.00    -0.54
 22   1.2039      0.00    -0.04       0.00    -0.53
 23   1.2042      0.00     0.51       0.00    -0.45
 24   4.0385      0.00     0.30       0.00     0.08
 25   4.0386      0.00     0.13       0.00    -0.03
 26   4.0414      0.00    -0.01       0.00     0.14
 27  10.0013      0.00    -0.01       0.00     0.16
 28  10.0015      0.00     0.60       0.00    -0.18
 29  10.0069      0.00    -0.14       0.00     0.20
 30  10.0072      0.00     0.33       0.00     0.03
 31  10.0845      0.00    -0.21       0.00    -0.13
 32  10.0845      0.00    -0.18       0.00    -0.12
 33  10.0845      0.00    -0.22       0.00    -0.10
 34  10.0846      0.00    -0.12       0.00    -0.17
 35  17.2863      0.00     0.07       0.00     0.24
 36  17.2866      0.00     0.40       0.00     0.30
 37  19.1704      0.00    -0.06       0.00    -0.04
 38  19.1704      0.00     0.02       0.00    -0.01

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.

98UR43    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.886    39.886    39.886
ecceobj         0.227     0.227     0.227
incobj          8.744     8.744     8.744
qmin           30.221    30.222    30.220
qmax           49.073    49.073    49.072
amean          39.455    39.456    39.455
amin           39.082    39.082    39.083
amax           39.888    39.893    39.886
emean           0.209     0.209     0.209
emin            0.186     0.186     0.186
emax            0.232     0.231     0.232
imean           8.095     8.095     8.095
imin            7.338     7.338     7.338
imax            9.267     9.268     9.266
excite_mean     0.253     0.253     0.253
fracstop        1.000     1.000     1.000
cjmean          2.979     2.979     2.979

libcent 0       179.5     179.7     179.8
libamp  0        47.3      47.8      47.1
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       194.0     194.1     194.0
kozaiamp        180.0     180.0     180.0