3. Instrument Modes and Astronomical Observation Templates

The three main PHT observing modes are photometry, spectrophotometry and polarimetry. In the photometric mode PHT offered a number of possibilities to observe point-like and extended sources, in staring or in chopped observing mode.

In the following sections these modes are described in detail. Chopping is regarded here as a general procedure applicable to several modes.

• Chopping
• Photometry - Single pointing multi-filter/multi-aperture
• Photometry - Multi-filter rastering
• Photometry - Absolute photometry
• Photometry - Oversampled Scans and Maps
• Photometry - Sparse maps
• Polarimetry
• Spectrophotometry