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VIMOS User Manual
VLT-MAN-ESO-14610-3509
Figure 4.2: P2PP: Example of a MOS OB
• Exposure time in (seconds). This is the integration time for the acquisition image that will
be taken through the mask to check the position of the reference stars and of the science target. A typical
value is 60s, depending on the brightness of the reference stars defined with VMMPS.
• Filter. This filter is the one to be used for the acquisition image. It is highly recommended to
choose the same filter as the one used for the pre-imaging: R.2
• Optional additional velocity (moving targets) in alpha and delta (Additional Velocity RA and
Additional Velocity DEC). This velocity should be expressed in arcsec/sec. These parameters
are mostly intended for imaging and possibly IFU programmes of moving targets and a priori unlikely
to be of much use in MOS mode. If no additional velocity is needed, these parameters should be left to
their default values.
• ADP files 1 to ADP file 4. These 4 parameters are the names of the ADP files produced by
VMMPS. The files 1 to 4 correspond to the 4 quadrants of the instrument and should be set in the right
order. When selecting an ADP file entry in P2PP, a browser window opens up allowing to locate the file
on the local disk. This window is presented in Figure 4.3.
2
The available filters are: U, B, V, R, I, z, OS-blue, OS-red, GG435, GG475 and no filter, Free.