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It is possible to define various timing constraints for the observations that form a Science Goal.
The first option is thought to be mainly useful for observations of solar-system objects and specifies that the 12- and 7-m arrays should observe simultaneously (at the same time, for the same amount of time). If this is requested, it must be the case that only a single 12-m configuration and the 7-m array are required or a validation error will result. As implied, the 7-m time will be set to the same as the 12-m.
It is also possible to say when the observations should take place. In general this is only available when a single array configuration is required (single 12-m or 7-m) although it is available if the simultaneous option has been selected. Two kinds of time-constrained observations are allowed:
- Specific dates - the SB will be observed during one of the specified dates. This will be useful for coordinating observations with another observatory or for observing objects that are only visible during certain time windows e.g. comets.
- Multiple visits - if the SB needs to be repeated several times, these can be specified individually, both in terms of a specific date, or a time relative to a previous visit. Reasonable margins on the requested times should be entered. If these are too restrictive then it will be difficult to schedule the SB executions. A text box is available if it is desired to give further information regarding the proposed time-constrained observing.
Next: Technical Justification
Up: Control and Performance
Previous: Time specification - Solar
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The ALMA OT Team, 2017 Dec 18