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XMM-Newton Science Analysis System


esky2det (esky2det-1.5.1) [xmmsas_20030110_1802-5.4.1]

Meta Index / Home Page / Description

Command-line position entry.

The sky position of a single source may be entered via the parameters ra, dec and (optionally) errorradius. These are parameters of type angle and can therefore be provided in a variety of formats. See the task param documentation for further details.

In this mode, the output positions are printed to a single line of standard output. The format of this output line is given in the following examples.

1. Example 1: command line

   esky2det datastyle=user ra=03h47m40.2s dec=24d21m54.62s outunit=raw
   

   gives the output

   # Instrument: EPN
   # Coord sytem of output is RAWXY (PIXCOORD1).
   # Source RA =  56.917500 deg.
   # Source dec =  24.365171 deg.
   #
   # rawX     rawY   ccd
    32        188      8
   

2. Example 2: if you want to display the numbers only, add withheader=`no' to the command line. In the case above, this would give

    32        188      8
   

   This style is suitable for batch running of esky2det from scripts.

3. Example 3: in this example, the DETX/Y coordinate system is chosen and an uncertainty radius is supplied. The command line example is

   esky2det datastyle=user ra=03h46m25.3s dec=24d18m30.3s outunit=det
   witherrors=yes  errorradius=00d00m05.0s
   

   which gives the output

   # Instrument: EPN
   # Coord sytem of output is DETXY (CAMCOORD2 but in units of 0.05 arcsec).
   # Source RA =  56.605415 deg.
   # Source dec =  24.308416 deg.
   #
   # detX       detY       det err
   -15043.9    -2111.8       100.0
   

4. Example 4: The same command, but with outunit set now back to `raw', gives

   # Instrument: EPN
   # Coord sytem of output is RAWXY (PIXCOORD1).
   # Source RA =  56.605415 deg.
   # Source dec =  24.308416 deg.
   #
   # rawX     rawY   ccd   X err     Y err
    40        189     12     1         1
   

No output is performed for sources which are outside the field of view or, in the case of RAWX/Y, not located on a ccd: an error message is generated instead.

You may be asking yourself "how is the pointing and instrument information obtained in these examples?" The answer this question is found in subsection 3.4.