Orbit Fit and Astrometric record for 98HL151

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: 98HL151   
# Created Sun May 27 01:37:04 2018
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:  15.03y
# First observation: 1998/04/29
#  Last observation: 2013/05/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.001022   0.025549   0.000596  -0.013614   0.027704   0.000000
# Chi-squared of fit:    43.18 DOF:   44 RMS:  0.23
# Min/Max residuals:    -0.45    0.47
# Exact a, adot, b, bdot, g, gdot:
  1.495760E-05  2.484771E-02 -6.097121E-06 -1.320823E-02  2.685724E-02  1.568715E-03
# Covariance matrix:
  1.2854E-13 -5.0151E-14 -2.3630E-14  2.2454E-14 -2.6763E-14 -1.0735E-13
 -5.0151E-14  4.2631E-14  2.2494E-14 -2.1387E-14  3.3417E-14  1.0221E-13
 -2.3630E-14  2.2494E-14  9.7108E-14 -2.0183E-14  1.3074E-14  5.7538E-14
  2.2454E-14 -2.1387E-14 -2.0183E-14  1.3966E-14 -1.3409E-14 -5.4670E-14
 -2.6763E-14  3.3417E-14  1.3074E-14 -1.3409E-14  7.0993E-13  6.0637E-14
 -1.0735E-13  1.0221E-13  5.7538E-14 -5.4670E-14  6.0637E-14  2.6139E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.262947 -163.749941   -0.380987   -0.004519   -0.937478  2450932.761241
# Heliocentric elements and errors
Epoch:              2450930.5000  =  1998/04/27
Mean Anomaly:           43.08279 +/-     0.040
Argument of Peri:      130.11285 +/-     0.047
Long of Asc Node:       16.34858 +/-     0.000
Inclination:            28.08405 +/-     0.000
Eccentricity:         0.08662701 +/-    0.0001
Semi-Major Axis:     40.57662473 +/-    0.0054
Time of Perihelion: 2439632.1865 +/-      10.1
Perihelion:          37.06159304 +/-    0.0057
Aphelion:            44.09165643 +/-    0.0065
Period (y)              258.4771 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.53103282 +/-    0.0011
Ecliptic Y          -11.05021754 +/-    0.0003
Ecliptic Z           -0.17109677 +/-    0.0000
Ecliptic XDOT         0.00056316 +/-    0.0000
Ecliptic YDOT        -0.00246609 +/-    0.0000
Ecliptic ZDOT        -0.00134727 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.16612294 +/-    0.0011
Geocenter to KBO     37.23390360 +/-    0.0012
# Hcoef:  8.05

The following table shows the complete astrometric record for 98HL151. 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 (98HL151) followed by the observatory code and reference code for the source of the astrometry.

1998 04  29.26051  12 59 28.83   -06 38 00.9   23.5R 98HL151   568  Ca4825      
1998 04  29.32553  12 59 28.52   -06 37 59.5   23.5R 98HL151   568  Ca4825      
1998 04  29.38753  12 59 28.23   -06 37 57.8   23.5R 98HL151   568  Ca4825      
1998 05  02.30459  12 59 14.51   -06 36 55.6   23.8R 98HL151   568  Ca4825      
1998 05  02.31623  12 59 14.43   -06 36 55.5   23.8R 98HL151   568  Ca4825      
1998 05  02.32787  12 59 14.41   -06 36 55.3   23.8R 98HL151   568  Ca4825      
1998 05  22.35851  12 57 52.51   -06 31 01.8   23.8R 98HL151   568  Ca4825      
1998 05  22.37794  12 57 52.41   -06 31 01.7   23.8R 98HL151   568  Ca4825      
1998 05  22.38956  12 57 52.39   -06 31 01.6   23.8R 98HL151   568  Ca4825      
1999 03  16.61148  13 07 19.03   -08 09 25.9   23.1R 98HL151   568  Ca4825      
1999 03  16.64553  13 07 18.85   -08 09 25.5   23.1R 98HL151   568  Ca4825      
1999 04  08.50980  13 05 22.36   -08 00 43.9   23.2R 98HL151   568  Ca4825      
1999 04  08.53343  13 05 22.24   -08 00 43.4   23.2R 98HL151   568  Ca4825      
2001 04  27.37696  13 11 58.40   -10 20 47.6   23.3R 98HL151   568  Cd0712      
2001 04  27.38514  13 11 58.37   -10 20 47.7         98HL151   568  Cd0712      
2001 04  27.42412  13 11 58.17   -10 20 46.8         98HL151   568  Cd0712      
2001 04  27.43230  13 11 58.12   -10 20 46.4         98HL151   568  Cd0712      
2001 05  19.32581  13 10 19.74   -10 13 01.7   23.8R 98HL151   568  Ce6434      
2001 05  20.33127  13 10 15.85   -10 12 43.3         98HL151   568  Ce6434      
2001 05  20.33944  13 10 15.82   -10 12 43.1         98HL151   568  Ce6434      
2001 05  20.40120  13 10 15.59   -10 12 42.1         98HL151   568  Ce6434      
2001 05  20.40936  13 10 15.56   -10 12 41.9         98HL151   568  Ce6434      
2013 05  08.04857  14 03 04.446  -24 17 24.59  23.8r 98HL151   807  C~2Y3p      
2013 05  08.13283  14 03 03.938  -24 17 22.67        98HL151   807  C~2Y3p      
2013 05  08.22009  14 03 03.492  -24 17 20.25        98HL151   807  C~2Y3p      

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    -0.07       0.00    -0.35
  2   0.0002     -4.80     0.01      -0.48    -0.32
  3   0.0003     -9.44     0.03      -0.58     0.07
  4   0.0083   -222.07    -0.02     -21.76     0.09
  5   0.0084   -223.21    -0.31     -22.13    -0.19
  6   0.0084   -223.56     0.19     -22.06    -0.03
  7   0.0632  -1486.07     0.01    -165.53     0.13
  8   0.0633  -1487.48    -0.35    -166.01    -0.21
  9   0.0633  -1487.80    -0.04    -166.03    -0.14
 10   0.8798   8565.55    -0.03   -2394.15    -0.09
 11   0.8799   8562.93    -0.12   -2394.80    -0.45
 12   0.9425   6762.10    -0.22   -2571.24    -0.19
 13   0.9426   6760.26    -0.11   -2571.46    -0.23
 14   2.9955  15409.01     0.20   -8141.47     0.47
 15   2.9956  15408.64     0.47   -8141.73     0.26
 16   2.9957  15405.55     0.44   -8142.01     0.24
 17   2.9957  15404.71     0.25   -8141.92     0.39
 18   3.0556  13876.02     0.01   -8258.12     0.14
 19   3.0584  13815.59    -0.14   -8262.73     0.16
 20   3.0584  13815.10    -0.13   -8262.71     0.22
 21   3.0586  13811.56     0.07   -8263.07     0.18
 22   3.0586  13811.07     0.08   -8263.05     0.23
 23  15.0247  78316.04     0.31  -42167.71    -0.14
 24  15.0250  78307.68    -0.41  -42167.82    -0.38
 25  15.0252  78300.04    -0.11  -42167.13     0.14

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.

98HL151    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        40.559    40.575    40.542
ecceobj         0.088     0.088     0.088
incobj         28.088    28.088    28.088
qmin           36.404    36.425    36.395
qmax           45.493    45.504    45.462
amean          40.815    40.830    40.798
amin           40.502    40.502    40.481
amax           41.157    41.178    41.135
emean           0.091     0.092     0.091
emin            0.078     0.078     0.077
emax            0.105     0.105     0.105
imean          27.797    27.799    27.797
imin           27.404    27.401    27.399
imax           28.203    28.192    28.185
excite_mean     0.475     0.475     0.475
fracstop        1.000     1.000     1.000
cjmean          2.789     2.789     2.789

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       185.6     185.4     186.5
kozaiamp        180.0     180.0     179.9