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 Sat Dec  4 02:08:27 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     31 observations of     31
# Arc:  18.95y
# First observation: 1998/04/21
#  Last observation: 2017/04/01
# Chi-squared of fit:    66.12 DOF:     56 RMS:  0.26
# Min/Max residuals:    -0.55    0.61
# Exact a, adot, b, bdot, g, gdot:
  1.367105E-05  2.336157E-02 -5.437641E-06 -8.516133E-03  2.563364E-02 -7.193429E-04
# Covariance matrix:
  1.1136E-13 -2.6387E-14 -1.1171E-14  7.6793E-15 -2.4514E-14 -4.4526E-14
 -2.6387E-14  1.9313E-14  8.1168E-15 -6.5746E-15 -1.2500E-14  3.8798E-14
 -1.1171E-14  8.1168E-15  8.3234E-14 -8.2841E-15  3.6417E-15  1.7123E-14
  7.6793E-15 -6.5746E-15 -8.2841E-15  3.1667E-15  3.5077E-15 -1.3806E-14
 -2.4514E-14 -1.2500E-14  3.6417E-15  3.5077E-15  1.9109E-13 -2.4426E-14
 -4.4526E-14  3.8798E-14  1.7123E-14 -1.3806E-14 -2.4426E-14  8.1434E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
   15.310426 -178.472084   -0.491739    0.232946   -0.851707  2450924.792541
# Heliocentric elements and errors
Epoch:              2450924.5000  =  1998/04/21
Mean Anomaly:          197.29295 +/-     0.022
Argument of Peri:      306.86714 +/-     0.014
Long of Asc Node:       37.23802 +/-     0.000
Inclination:            25.01895 +/-     0.000
Eccentricity:         0.05734125 +/-    0.0001
Semi-Major Axis:     37.78020253 +/-    0.0025
Time of Perihelion: 2489259.7873 +/-       6.9
Perihelion:          35.61383836 +/-    0.0030
Aphelion:            39.94656670 +/-    0.0032
Period (y)              232.2227 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.47469809 +/-    0.0006
Ecliptic Y           -1.52151600 +/-    0.0000
Ecliptic Z           10.30066238 +/-    0.0002
Ecliptic XDOT        -0.00009745 +/-    0.0000
Ecliptic YDOT        -0.00249003 +/-    0.0000
Ecliptic ZDOT        -0.00089768 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.85877340 +/-    0.0006
Geocenter to KBO     39.01130181 +/-    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      
2016 04  09.209896 13 44 54.02   -05 07 18.6         98HN151   W84  C~3i8o      
2016 04  09.211140 13 44 54.02   -05 07 18.5         98HN151   W84  C~3i8o      
2017 04  01.340619 13 49 42.84   -06 13 08.6         98HN151   W84  C~3i8o      
2017 04  01.342344 13 49 42.83   -06 13 08.5         98HN151   W84  C~3i8o      

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    -0.03
     2   0.0002      0.00     0.17       0.00    -0.12
     3   0.0003      0.00     0.22       0.00     0.18
     4   0.0276      0.00     0.14       0.00     0.61
     5   0.0277      0.00    -0.02       0.00     0.35
     6   0.0277      0.00    -0.18       0.00     0.49
     7   0.0875      0.00     0.10       0.00     0.11
     8   0.0875      0.00    -0.13       0.00    -0.17
     9   0.0876      0.00    -0.47       0.00    -0.23
    10   0.1943      0.00     0.10       0.00    -0.44
    11   0.1945      0.00     0.51       0.00    -0.20
    12   0.7562      0.00     0.08       0.00    -0.02
    13   0.7618      0.00     0.04       0.00    -0.47
    14   2.8475      0.00    -0.12       0.00     0.19
    15   2.8476      0.00    -0.12       0.00     0.17
    16   2.9243      0.00    -0.37       0.00     0.27
    17   2.9245      0.00    -0.24       0.00     0.25
    18   3.8906      0.00    -0.12       0.00    -0.35
    19   3.8906      0.00    -0.06       0.00    -0.38
    20   3.8906      0.00    -0.04       0.00    -0.36
    21   4.9445      0.00     0.09       0.00    -0.06
    22   4.9445      0.00     0.15       0.00    -0.08
    23   4.9446      0.00     0.19       0.00    -0.04
    24  15.0635      0.00     0.28       0.00     0.51
    25  15.0636      0.00    -0.11       0.00     0.19
    26  16.9202      0.00    -0.29       0.00     0.19
    27  16.9204      0.00     0.10       0.00     0.09
    28  17.9683      0.00     0.03       0.00    -0.55
    29  17.9683      0.00     0.13       0.00    -0.48
    30  18.9461      0.00    -0.04       0.00     0.14
    31  18.9461      0.00    -0.06       0.00     0.20

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        37.812    37.812    37.812
ecceobj         0.056     0.056     0.056
incobj         25.041    25.041    25.041
qmin           35.246    35.307    35.285
qmax           40.931    40.962    40.855
amean          37.977    37.990    37.976
amin           37.685    37.692    37.681
amax           38.285    38.293    38.283
emean           0.052     0.051     0.051
emin            0.037     0.036     0.036
emax            0.070     0.070     0.068
imean          23.585    23.598    23.591
imin           22.797    22.789    22.780
imax           24.568    24.568    24.568
excite_mean     0.403     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       176.3     176.5     175.7
kozaiamp        180.0     180.0     180.0