Name
driftscan -- acquire image while drifting target across the slit
Purpose
Starting with sidereal tracking with objects centered on slits,
offset the telescope and begin tracking at a non-sidereal rate
while acquiring an exposure. At the end of the exposure, return
telescope to starting position and restore sidereal track rates.
Usage
driftscan [-v] <length>
Arguments
-v = verbose mode
length = length of drift scan [arcsec]
Output
Restrictions
- Slit must be oriented N/S so that drift scanning is purely E/W.
- Guide star should be at least 0.5*length arcsec from edge of pickoff mirror
so that it is not lost during offset
Exit values
0 = normal completion
1 = wrong number of arguments
Example
1) Acquire a spectrum while tracking at a non-sidereal rate
over a 10 arcsec length:
driftscan 10
See Also
The shell script driftscan
DEIMOS script index
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Last modified: Mon Mar 11 18:59:34 2013