Orbit Fit and Astrometric record for 98HN151

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: 98HN151   
# Created Thu Oct 19 01:36:57 2017
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   27
# Arc:  16.92y
# First observation: 1998/04/21
#  Last observation: 2015/03/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.001997   0.025029   0.000778  -0.009101   0.024303   0.000000
# Chi-squared of fit:    52.98 DOF:   48 RMS:  0.25
# Min/Max residuals:    -0.47    0.62
# Exact a, adot, b, bdot, g, gdot:
  1.365730E-05  2.336162E-02 -5.483738E-06 -8.516123E-03  2.563353E-02 -7.190909E-04
# Covariance matrix:
  1.1566E-13 -3.1808E-14 -1.1928E-14  9.0831E-15 -1.8955E-14 -5.9964E-14
 -3.1808E-14  2.6349E-14  9.8952E-15 -8.8161E-15 -1.9811E-14  5.9236E-14
 -1.1928E-14  9.8952E-15  8.6884E-14 -1.0551E-14  1.4086E-15  2.3820E-14
  9.0831E-15 -8.8161E-15 -1.0551E-14  4.7865E-15  6.0228E-15 -2.1143E-14
 -1.8955E-14 -1.9811E-14  1.4086E-15  6.0228E-15  1.9904E-13 -4.5489E-14
 -5.9964E-14  5.9236E-14  2.3820E-14 -2.1143E-14 -4.5489E-14  1.4201E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   15.310426 -178.472084   -0.491739    0.232946   -0.851706  2450924.792541
# Heliocentric elements and errors
Epoch:              2450920.5000  =  1998/04/17
Mean Anomaly:          197.26993 +/-     0.023
Argument of Peri:      306.87197 +/-     0.015
Long of Asc Node:       37.23811 +/-     0.000
Inclination:            25.01890 +/-     0.000
Eccentricity:         0.05732393 +/-    0.0001
Semi-Major Axis:     37.78090333 +/-    0.0026
Time of Perihelion: 2489262.2780 +/-       3.8
Perihelion:          35.61515351 +/-    0.0031
Aphelion:            39.94665314 +/-    0.0034
Period (y)              232.2291 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.47486205 +/-    0.0007
Ecliptic Y           -1.52151984 +/-    0.0000
Ecliptic Z           10.30070542 +/-    0.0002
Ecliptic XDOT        -0.00009748 +/-    0.0000
Ecliptic YDOT        -0.00249005 +/-    0.0000
Ecliptic ZDOT        -0.00089767 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.85893330 +/-    0.0006
Geocenter to KBO     39.01141030 +/-    0.0007
# Hcoef:  8.25

The following table shows the complete astrometric record for 98HN151. 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 (98HN151) followed by the observatory code and reference code for the source of the astrometry.

1998 04  21.29181  12 30 23.73   +13 24 59.8   24.5R 98HN151   568  Ca4825      
1998 04  21.34742  12 30 23.47   +13 25 00.4   24.5R 98HN151   568  Ca4825      
1998 04  21.38851  12 30 23.28   +13 25 01.2   24.5R 98HN151   568  Ca4825      
1998 05  01.38939  12 29 39.48   +13 26 30.9   24.5R 98HN151   568  Ca4825      
1998 05  01.40115  12 29 39.42   +13 26 30.7   24.5R 98HN151   568  Ca4825      
1998 05  01.41292  12 29 39.36   +13 26 30.9   24.5R 98HN151   568  Ca4825      
1998 05  23.25272  12 28 24.46   +13 25 42.3   24.5R 98HN151   568  Ca4825      
1998 05  23.26531  12 28 24.41   +13 25 41.9   24.5R 98HN151   568  Ca4825      
1998 05  23.27895  12 28 24.35   +13 25 41.7   24.5R 98HN151   568  Ca4825      
1998 07  01.26692  12 27 47.38   +13 10 44.4   24.5R 98HN151   568  Ca4825      
1998 07  01.34797  12 27 47.47   +13 10 41.8   24.5R 98HN151   568  Ca4825      
1999 01  22.48182  12 40 33.04   +11 43 56.4   24.5R 98HN151   568  Ca4825      
1999 01  24.55395  12 40 30.02   +11 44 51.0   24.5R 98HN151   568  Ca4825      
2001 02  24.32820  12 47 13.63   +10 00 33.5         98HN151   309  Cc7385      
2001 02  24.37884  12 47 13.43   +10 00 35.1         98HN151   309  Cc7385      
2001 03  24.38472  12 45 06.82   +10 14 59.1   23.0R 98HN151   695  Cc7385      
2001 03  24.46797  12 45 06.41   +10 15 01.4         98HN151   695  Cc7385      
2002 03  12.319099 12 50 12.43   +09 08 04.5   23.3V 98HN151   645  C~1cF1      
2002 03  12.319928 12 50 12.43   +09 08 04.5   23.1V 98HN151   645  C~1cF1      
2002 03  12.322416 12 50 12.42   +09 08 04.6   23.8V 98HN151   645  C~1cF1      
2003 04  01.286598 12 52 42.78   +08 16 24.0   23.2V 98HN151   645  C~1cF1      
2003 04  01.287428 12 52 42.78   +08 16 24.0   23.0V 98HN151   645  C~1cF1      
2003 04  01.289915 12 52 42.77   +08 16 24.1   23.9V 98HN151   645  C~1cF1      
2013 05  14.22152  13 29 48.46   -01 48 04.7   23.8R 98HN151   G37  C~0snV      
2013 05  14.28417  13 29 48.16   -01 48 04.2         98HN151   G37  C~0snV      
2015 03  23.39738  13 42 10.80   -04 11 40.2   23.6R 98HN151   695  C~1Q39      
2015 03  23.45985  13 42 10.54   -04 11 38.8         98HN151   695  C~1Q39      

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     0.16       0.00     0.05
  2   0.0002     -3.71     0.20      -1.00    -0.03
  3   0.0003     -6.56     0.12      -1.41     0.26
  4   0.0276   -626.50    -0.13    -180.54     0.62
  5   0.0277   -627.22    -0.16    -181.08     0.32
  6   0.0277   -628.10    -0.36    -181.26     0.38
  7   0.0875  -1606.23     0.04    -670.99     0.15
  8   0.0875  -1606.73    -0.06    -671.65    -0.20
  9   0.0876  -1607.45    -0.33    -672.19    -0.39
 10   0.1943  -1735.60     0.25   -1711.48    -0.36
 11   0.1945  -1733.34     0.52   -1713.32     0.02
 12   0.7562  10638.22     0.10   -1836.40     0.01
 13   0.7618  10574.94     0.26   -1805.25    -0.41
 14   2.8475  18642.85    -0.19   -5000.92     0.12
 15   2.8476  18639.47    -0.19   -5000.71     0.10
 16   2.9243  16564.32    -0.47   -5003.28     0.09
 17   2.9245  16557.82    -0.34   -5003.74     0.13
 18   3.8906  22412.83     0.02   -6749.78    -0.38
 19   3.8906  22412.83     0.09   -6749.78    -0.38
 20   3.8906  22412.66     0.10   -6749.75    -0.35
 21   4.9445  25800.15     0.07   -8632.08    -0.03
 22   4.9445  25800.15     0.14   -8632.08    -0.02
 23   4.9446  25799.97     0.16   -8632.05     0.03
 24  15.0635  74760.31     0.10  -28258.41     0.48
 25  15.0636  74755.48    -0.14  -28259.92    -0.02
 26  16.9202  90965.26    -0.20  -31926.49    -0.14
 27  16.9204  90960.31     0.27  -31926.81    -0.06

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.

98HN151    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        37.813    37.820    37.805
ecceobj         0.056     0.056     0.056
incobj         25.042    25.042    25.042
qmin           35.328    35.317    35.209
qmax           40.813    40.826    40.820
amean          37.998    38.004    37.973
amin           37.701    37.720    37.680
amax           38.294    38.303    38.276
emean           0.051     0.051     0.052
emin            0.037     0.038     0.037
emax            0.067     0.067     0.069
imean          23.611    23.608    23.578
imin           22.819    22.801    22.710
imax           24.568    24.577    24.571
excite_mean     0.404     0.404     0.403
fracstop        1.000     1.000     1.000
cjmean          2.850     2.850     2.850

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       175.9     176.0     177.7
kozaiamp        179.9     180.0     180.0