.help bct Dec94 ftools.rosat
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NAME
BCT - corrects the times in the rosat orbit table at the barycenter.
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USAGE
   bct input output ra dec
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DESCRIPTION
This task computes the barycenter correction on the times contained in the
orbit file. The times in the orbit file are sampled every 60 seconds.
This task takes as input:
.ls
1. orbit file. The program accepts the three different format for the orbit
file produced by the ROSAT processing. The new RDF format file where the
orbit data are stored within an extension called EXTNAME=EPHEM. The old
style US format file where the orbit data are splitted in several extension
within a file called EXTNAME=SPORB. The old German style format where the
orbit data are stored within one extension. No EXTNAME keyword is used in
the table in this last case.
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.ls
2. output correction table in FITS. This contains the uncorrected and the
corrected orbit time. The output FITS file consists in 4 columns, containing
respectively the integer and the fractional part of the uncorrected and
corrected times. The times are written as JD. The output file is used by ABC.
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.ls
3. the equatorial coordinates of the source given either as hh mm ss.s,
dd mm ss.s (separated by a blank space) or in degrees (epoch 2000.0).
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This program makes use of the JPL DE200 ephemeris as a FITS binary table
(Standish, M., 1982 Astr. Ap., 114, 297).
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NOTES
Bct needs to be run before abc.
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The leap seconds are accounted through 1-Jan-1999.
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PARAMETERS
.ls infile [filename]
The name of the file containing the orbit data.
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.ls outfile [filename]
The name of the output file containing the corrected and uncorrected
orbit times.
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.ls ra  [string]
The r.a. of the source given either in hh mm ss.s or deg
(equinox 2000).
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.ls dec [string]
The dec. of the source given either in  dd mm ss.s or deg
(equinox 2000.0).
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.ls (tchat = 10) [integer]
Terminal chattiness level.
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.ls (lchat = 0) [integer]
Log file chattiness level.  Enable logging by setting FLOGFILE environment
variable to filename.  Prefix a + to append to an existing file.
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.ls (ephfile = de200_new.fits) [filename]
The name of the JPL 2000 ephemeris FITS file
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EXAMPLES
.fi
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BUGS
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SEE ALSO
 rosbary abc
.endhelp
