Orbit Fit and Astrometric record for 98FS144

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: 98FS144   
# Created Sat Dec 16 02:36:57 2017
# Orbit generated from Bernstein formalism
# Fitting   20 observations of   20
# Arc:  14.97y
# First observation: 1998/03/23
#  Last observation: 2013/03/12
Preliminary a, adot, b, bdot, g, gdot:
  -0.001339   0.024613  -0.000100   0.001981   0.024260   0.000000
# Chi-squared of fit:   152.22 DOF:   34 RMS:  0.49
# Min/Max residuals:    -1.00    1.09
# Exact a, adot, b, bdot, g, gdot:
  1.546964E-05  2.368284E-02 -5.185104E-07  1.920637E-03  2.446558E-02  3.548624E-04
# Covariance matrix:
  2.2224E-13 -9.3489E-14  1.0762E-14 -6.7409E-15 -1.0011E-13 -2.1464E-13
 -9.3489E-14  9.0753E-14 -6.5681E-15  6.9299E-15  1.0697E-14  2.2904E-13
  1.0762E-14 -6.5681E-15  1.0181E-13 -1.0509E-14 -1.0512E-14 -1.6736E-14
 -6.7409E-15  6.9299E-15 -1.0509E-14  4.2006E-15  1.0614E-15  1.8210E-14
 -1.0011E-13  1.0697E-14 -1.0512E-14  1.0614E-15  1.9663E-13  1.7365E-14
 -2.1464E-13  2.2904E-13 -1.6736E-14  1.8210E-14  1.7365E-14  6.0284E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.896235  167.021506   -0.260458   -0.150230   -0.958641  2450895.541701
# Heliocentric elements and errors
Epoch:              2450890.5000  =  1998/03/18
Mean Anomaly:          107.11050 +/-     0.159
Argument of Peri:      188.61808 +/-     0.151
Long of Asc Node:      228.83274 +/-     0.001
Inclination:             9.87360 +/-     0.000
Eccentricity:         0.02254000 +/-    0.0000
Semi-Major Axis:     41.53023012 +/-    0.0031
Time of Perihelion: 2421805.1390 +/-      43.0
Perihelion:          40.59413880 +/-    0.0032
Aphelion:            42.46632144 +/-    0.0033
Period (y)              267.6423 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.34646959 +/-    0.0007
Ecliptic Y            9.02986882 +/-    0.0002
Ecliptic Z           -6.32099393 +/-    0.0001
Ecliptic XDOT        -0.00066352 +/-    0.0000
Ecliptic YDOT        -0.00255774 +/-    0.0000
Ecliptic ZDOT         0.00020611 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.82500572 +/-    0.0007
Geocenter to KBO     40.87374696 +/-    0.0007
# Hcoef:  6.70

The following table shows the complete astrometric record for 98FS144. 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 (98FS144) followed by the observatory code and reference code for the source of the astrometry.

1998 03  23.04097  10 58 25.22   -03 04 26.1         98FS144   807  Ca3016      
1998 03  23.06742  10 58 25.07   -03 04 25.2   22.6R 98FS144   807  Ca3016      
1998 03  23.16044  10 58 24.68   -03 04 21.6   22.7R 98FS144   807  Ca3016      
1998 03  24.07084  10 58 20.79   -03 03 53.7   22.7R 98FS144   807  Ca3016      
1998 03  27.05289  10 58 08.43   -03 02 19.0         98FS144   807  Ca3016      
1998 03  27.16120  10 58 07.98   -03 02 15.7   22.4R 98FS144   807  Ca3016      
1998 12  13.28766  11 08 40.99   -03 51 32.2         98FS144   950  Ca3335      
1998 12  15.23928  11 08 41.47   -03 51 59.9         98FS144   950  Ca3335      
1998 12  16.25293  11 08 41.57   -03 52 13.8         98FS144   950  Ca3335      
1999 01  22.46403  11 07 43.52   -03 53 15.4   22.2R 98FS144   568  Ca5537      
1999 01  22.51817  11 07 43.32   -03 53 14.4         98FS144   568  Ca5537      
2000 01  06.61373  11 13 28.79   -04 19 21.6   22.7R 98FS144   568  Ca8410      
2000 01  06.64435  11 13 28.72   -04 19 21.7   22.6R 98FS144   568  Ca8410      
2000 01  06.66171  11 13 28.70   -04 19 21.7   22.7R 98FS144   568  Ca8410      
2001 02  17.09584  11 16 25.33   -04 35 58.8         98FS144   950  Cc6359      
2001 02  17.14333  11 16 25.13   -04 35 57.7         98FS144   950  Cc6359      
2001 05  21.28509  11 11 07.47   -03 52 34.3         98FS144   568  Cd2198      
2001 05  21.31799  11 11 07.44   -03 52 33.7         98FS144   568  Cd2198      
2013 03  12.28751  12 17 05.61   -09 12 19.8   22.9R 98FS144   G37  C~0qSP      
2013 03  12.42284  12 17 05.01   -09 12 16.2         98FS144   G37  C~0qSP      

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    -0.03       0.00     0.36
  2   0.0001     -2.42    -0.55      -0.04     0.21
  3   0.0003     -9.20    -0.62       1.01     0.90
  4   0.0028    -73.73    -0.72       4.10    -0.17
  5   0.0110   -281.11     0.64      19.50     0.44
  6   0.0113   -288.60     0.76      19.93     0.34
  7   0.7262   9601.91     0.06     962.51    -0.01
  8   0.7315   9619.25    -0.08     939.70     0.27
  9   0.7343   9626.01    -0.10     927.44    -0.00
 10   0.8362   8846.67     1.09     534.99    -0.01
 11   0.8364   8843.52     0.47     534.76     0.24
 12   1.7921  14234.38    -0.49    1080.38    -0.83
 13   1.7922  14233.44    -0.68    1079.88    -1.00
 14   1.7923  14233.17    -0.53    1079.77    -0.92
 15   2.9077  17071.34     0.50    1173.66     0.19
 16   2.9079  17068.13     0.54    1173.52     0.23
 17   3.1629  11654.34    -0.10    1751.46    -0.30
 18   3.1630  11653.69    -0.16    1751.84    -0.33
 19  14.9712  76811.78    -0.02    6095.67     0.18
 20  14.9716  76800.87    -0.00    6095.85     0.15

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.

98FS144    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        41.619    41.628    41.610
ecceobj         0.025     0.024     0.025
incobj          9.885     9.885     9.885
qmin           39.771    39.771    39.732
qmax           44.094    44.085    44.032
amean          41.826    41.836    41.817
amin           41.512    41.520    41.509
amax           42.157    42.155    42.136
emean           0.030     0.030     0.030
emin            0.014     0.014     0.014
emax            0.046     0.046     0.045
imean          11.600    11.596    11.605
imin           10.627    10.634    10.629
imax           12.382    12.379    12.386
excite_mean     0.203     0.203     0.203
fracstop        1.000     1.000     1.000
cjmean          3.027     3.027     3.027

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       185.5     186.1     185.6
kozaiamp        180.0     180.0     180.0