Orbit Fit and Astrometric record for 98HQ151

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: 98HQ151   
# Created Sat Oct 21 01:36:57 2017
# Orbit generated from Bernstein formalism
# Fitting   24 observations of   25
# Arc:  19.18y
# First observation: 1998/04/28
#  Last observation: 2017/07/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.005167   0.054066  -0.000928   0.011546   0.030790   0.000000
# Chi-squared of fit:    63.81 DOF:   42 RMS:  0.29
# Min/Max residuals:    -0.79    0.66
# Exact a, adot, b, bdot, g, gdot:
  1.985086E-05  4.749447E-02  5.591424E-06  1.004689E-02  3.646587E-02  3.138228E-03
# Covariance matrix:
  1.4766E-13 -6.3591E-14  7.8071E-15 -1.3988E-14  1.4085E-13 -6.7411E-14
 -6.3591E-14  8.2682E-14 -1.0364E-14  1.8530E-14 -6.5362E-14  8.7782E-14
  7.8071E-15 -1.0364E-14  8.9082E-14 -7.5487E-15  1.0415E-14 -1.1220E-14
 -1.3988E-14  1.8530E-14 -7.5487E-15  5.0277E-15 -1.8772E-14  2.0069E-14
  1.4085E-13 -6.5362E-14  1.0415E-14 -1.8772E-14  5.3898E-13 -9.4848E-14
 -6.7411E-14  8.7782E-14 -1.1220E-14  2.0069E-14 -9.4848E-14  9.5371E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.191942 -129.803039    0.220132    0.003072   -0.987614  2450931.999271
# Heliocentric elements and errors
Epoch:              2450930.5000  =  1998/04/27
Mean Anomaly:            7.76281 +/-     0.002
Argument of Peri:      346.48737 +/-     0.003
Long of Asc Node:      228.89325 +/-     0.000
Inclination:            11.95453 +/-     0.000
Eccentricity:         0.28250028 +/-    0.0001
Semi-Major Axis:     39.31866891 +/-    0.0053
Time of Perihelion: 2448988.6613 +/-       0.4
Perihelion:          28.21113390 +/-    0.0050
Aphelion:            50.42620393 +/-    0.0075
Period (y)              246.5508 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -18.34735742 +/-    0.0004
Ecliptic Y          -21.68821453 +/-    0.0004
Ecliptic Z            0.09204765 +/-    0.0000
Ecliptic XDOT         0.00259222 +/-    0.0000
Ecliptic YDOT        -0.00245304 +/-    0.0000
Ecliptic ZDOT         0.00075502 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   28.40796802 +/-    0.0004
Geocenter to KBO     27.42290221 +/-    0.0006
# Hcoef:  8.74

The following table shows the complete astrometric record for 98HQ151. 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 (98HQ151) followed by the observatory code and reference code for the source of the astrometry.

1998 04  28.49854  15 11 13.94   -17 36 31.8   23.0R 98HQ151   568  Ca4825      
1998 04  28.53791  15 11 13.66   -17 36 30.3   23.0R 98HQ151   568  Ca4825      
1998 04  28.57687  15 11 13.42   -17 36 29.2   23.0R 98HQ151   568  Ca4825      
1998 04  30.50541  15 11 00.76   -17 35 27.6   23.0R 98HQ151   568  Ca4825      
1998 04  30.53636  15 11 00.55   -17 35 26.5   23.0R 98HQ151   568  Ca4825      
1998 05  22.42736  15 08 34.68   -17 23 34.4   23.0R 98HQ151   568  Ca4825      
1998 05  22.43550  15 08 34.64   -17 23 34.2   23.0R 98HQ151   568  Ca4825      
1998 05  22.44365  15 08 34.58   -17 23 33.9   23.0R 98HQ151   568  Ca4825      
1998 06  30.44314  15 05 07.21   -17 05 54.8   23.0R 98HQ151   568  Ca4825      
1998 07  01.42272  15 05 03.78   -17 05 35.5   23.0R 98HQ151   568  Ca4825      
1999 03  14.59369  15 26 23.54   -18 03 39.2   23.0R 98HQ151   568  Ca4825      
1999 03  14.65306  15 26 23.40   -18 03 38.4   23.0R 98HQ151   568  Ca4825      
1999 05  07.52390  15 21 52.58   -17 41 00.1   22.8R 98HQ151   568  Ca4825      
1999 05  07.55245  15 21 52.39   -17 40 59.2   22.8R 98HQ151   568  Ca4825      
1999 05  24.29213  15 20 00.22   -17 32 20.3   22.9R 98HQ151   697  Cb0746      
1999 05  24.33071  15 19 59.95   -17 32 18.7   23.5R 98HQ151   697  Cb0746      
2000 05  07.50142  15 33 20.55   -17 47 12.5   22.9R 98HQ151   568  Cb5091      
2000 05  07.54326  15 33 20.26   -17 47 11.3   23.2R 98HQ151   568  Cb5091      
2015 06  12.36072  18 07 32.18   -15 00 40.6   22.3R 98HQ151   695  C~1hTP      
2015 06  12.38632  18 07 32.03   -15 00 40.5         98HQ151   695  C~1hTP      
2015 06  12.41209  18 07 31.88   -15 00 39.9         98HQ151   695  C~1hTP      
2015 06  12.42976  18 07 31.77   -15 00 39.9         98HQ151   695  C~1hTP      
2017 07  04.32205  18 23 22.79   -14 14 01.3   22.8R 98HQ151   G37  C~2IX3      
2017 07  04.36665  18 23 22.48   -14 14 02.0         98HQ151   G37  C~2IX3      
2017 07  04.40494  18 23 22.23   -14 14 01.8         98HQ151   G37  C~2IX3      

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     0.15       0.00    -0.25
  2   0.0001     -4.26    -0.16       0.38    -0.09
  3   0.0002     -7.86     0.14       0.52    -0.17
  4   0.0055   -198.75    -0.06      11.49    -0.33
  5   0.0056   -201.94    -0.12      11.75    -0.24
  6   0.0655  -2403.55    -0.14     136.29    -0.00
  7   0.0655  -2404.15     0.07     136.33    -0.01
  8   0.0656  -2405.06    -0.02     136.38     0.01
  9   0.1723  -5553.22    -0.11     345.41    -0.16
 10   0.1750  -5605.84     0.08     350.46    -0.14
 11   0.8764  12986.70     0.14    1773.25     0.12
 12   0.8765  12984.56     0.22    1773.53     0.01
 13   1.0240   8889.58    -0.32    2119.19    -0.22
 14   1.0241   8886.72    -0.27    2119.37    -0.21
 15   1.0699   7201.11     0.31    2212.29     0.03
 16   1.0700   7196.96     0.05    2212.85     0.39
 17   2.0260  18554.33     0.11    4188.24     0.66
 18   2.0261  18549.99     0.04    4188.41     0.60
 19  17.1221 183284.50    -0.61   40118.97     0.04
 20  17.1222 183280.57    -0.27   40118.76     0.01
 21  17.1223 183276.65     0.10   40119.23     0.66
 22  17.1223 183273.77     0.16   40118.98     0.53
 23  19.1836 210032.16 (   1.25)  46386.96 (   0.14)
 24  19.1838 210022.82     0.37   46385.14    -0.79
 25  19.1839 210015.35     0.14   46384.80    -0.37

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.

98HQ151    quality flag:3

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

axisobj        39.149    39.164    39.133
ecceobj         0.280     0.280     0.280
incobj         11.972    11.972    11.972
qmin           26.739    26.752    26.750
qmax           52.744    52.622    52.736
amean          39.454    39.454    39.454
amin           39.069    39.073    39.076
amax           39.932    39.951    39.930
emean           0.292     0.292     0.291
emin            0.265     0.265     0.264
emax            0.322     0.321     0.322
imean          12.597    12.570    12.619
imin           10.968    11.038    10.943
imax           13.940    13.861    14.001
excite_mean     0.365     0.365     0.365
fracstop        1.000     1.000     1.000
cjmean          2.899     2.899     2.899

libcent 0       180.6     180.3     179.9
libamp  0        41.4      44.2      39.0
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       150.4     151.3     150.4
kozaiamp        180.0     180.0     180.0