--------------------------------------------------------------------------- TIMING OVERHEAD FOR VARIOUS ACTIONS AT THE 0.9M --------------------------------------------------------------------------- There are two sets of times listed below, LIGHTNING and HUMAN. The LIGHTNING case assumes that everything goes absolutely perfectly, with observer reaction time an absolute minimum. This does not occur in real life. The HUMAN overhead is the one that should be adopted for all service observing programs. LIGHTNING HUMAN Slew/Target Acquisition 3 min 5 min (variable) Change Directory/File Name 1 min 1 min Change Chip Setup 1 min 2 min Change Tracking (non-sidereal) 1 min 2 min Focus Frame 3 min 6 min Chip Readout Full Chip/Four Amps 0.8 min 0.8 min Full Chip/One Amp 3 min 3 min Quarter Chip/Four Amps 0.3 min 0.3 min Quarter Chip/One Amp 0.8 min 0.8 min --------------------------------------------------------------------------- EXAMPLE --------------------------------------------------------------------------- You have a short service program that is inserted into a longer program scheduled for the same night. You want to use a different chip setup, non-sidereal tracking, and a single 300 second integration. The required time is: Slew/Target Acquisition 5 min Change Directory/File Name 1 min Change Chip Setup 2 min Change Tracking (non-sidereal) 2 min Focus Frame 6 min Chip Readout = Full Chip/Four Amps 0.8 min Integration Time 5 min Change Directory/File Name BACK 1 min Change Chip Setup BACK 2 min Change Tracking (non-sidereal) BACK 0 min (flip switch) TOTAL TIME FOR OBSERVATION 24.8 min --------------------------------------------------------------------------- TIMING OVERHEAD FOR VARIOUS ACTIONS AT THE 1.3M --------------------------------------------------------------------------- Slew/Target Acquisition 3 min --------------------------------------------------------------------------- TIMING OVERHEAD FOR VARIOUS ACTIONS AT THE 1.5M --------------------------------------------------------------------------- Slew/Target Acquisition 6 min ---------------------------------------------------------------------------