Chapter 6 Special Requirements
HST has special requirements that are used to specify scheduling constraints for both visits and exposures, and this article contains the descriptions of those requirements. |
Chapter Contents
- 6.1 Conventions for Special Requirements
- 6.2 Visit-level Special Requirements
- 6.3 Exposure-level Special Requirements
- 6.4 Implementation Only Special Requirements
Format definitions
Boldface type indicates the name of an APT parameter or a value for a parameter.
Black text indicates an important note.
Magenta text indicates available but unsupported parameters (requires prior approval from STScI).
Red text indicates restricted parameters (for STScI use only).
Brown text indicates text file parameters.
Items in brackets - <value> - are required values.
Items in square brackets - [<value>] - are optional.
See more about Special Requirements:
Limited Resources
Some special requirements that affect scheduling must be indicated in the Phase 1 proposal. These are noted in the tables below as well as in the text explanations of the requirements.
 Use the tables below to go directly to information for a particular special requirement. |
The following Special Requirements are applicable at the visit level, and they will affect all the exposures within that particular visit.
Supported Formats for Visit-level Special Requirements
1 The <angle in degrees> is currently limited to 25. All other angles from 0º to 90º are Restricted.
The following Special Requirements apply to individual exposures within a visit. All instances of <exposure-list> or <exposure> refer only to exposures in the same visit as the exposure carrying the requirement.
Supported Formats for Exposure-level Special Requirements
| FORMAT | EXAMPLE | |
|---|---|---|
No longer available; see text. | ||
See Exposure Containers: Exposure Sequences, Coordinated Parallels and Patterns PAR 4-6 WITH 1-3 | Must be indicated in Phase 1 proposal | |
RT ANALYSIS | ||
REQ UPLINK | ||
REQ EPHEM CORR OFF-13 | ||
POS TARG +6.3,-8.1 | ||
SAME POS AS 6 | ||
PATTERN <#> [<exposure-list>] (Replaced by Pattern Containers in the APT User Interface)) | See Exposure Containers: Exposure Sequences, Coordinated Parallels and Patterns and 7 Pointings and Patterns PATTERN 5 1-4 | |
| Timing Requirements | ||
LOW-SKY | Must be indicated in Phase 1 proposal | |
PHASE 0.09 TO 0.11 | Must be indicated in Phase 1 proposal | |
See Exposure Containers: Exposure Sequences, Coordinated Parallels and Patterns and 7 Pointings and Patterns SEQ 2-5 NON-INT | Must be indicated in Phase 1 proposal | |
SHADOW | Must be indicated in Phase 1 proposal | |
For engineering parameters
For available but unsupported parameters
For restricted parameters