6.3 Exposure-level Special Requirements

Exposure Special Requirements summary

HST has special requirements that are used to specify scheduling constraints at the exposure level, and this article contains the descriptions of those requirements.

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Format definitions

Boldface type indicates the name of an APT parameter or a value for a parameter.

(red star) 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.

More about Exposure-level Special Requirements

(lightbulb) Use the table below to go directly to information for a particular exposure-level special requirement.

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


For engineering parameters

FORMATEXAMPLE

Special Communications Requirements

FORMAT [AN or FN or HN or PN]

FORMAT FN

Visit Special Requirements

VISIBILITY INTERVAL <time>

VISIBILITY INTERVAL 5000 S

Exposure Special Requirements

MAXimum DURation (time or %) <value>

MAX DUR 125%

MINimum DURation (time or %) <value>

MIN DUR 1200S

EXPAND (pure parallel exposures only)

EXPAND

NEW OBSET [FULL ACQ]

NEW OBSET

NEW ALIGNMENT

NEW ALIGNMENT

SAME OBSET <exposure-list> (replaced by Exposure Group containers in the APT User Interface)

See Exposure Containers: Exposure Sequences, Coordinated Parallels and Patterns and 7 Pointings and Patterns

SAME OBSET 10-20

SAME ALIGNMENT <exposure-list> (in APT replaced by Exposure Group containers in the APT User Interface)

See Exposure Containers: Exposure Sequences, Coordinated Parallels and Patterns and 7 Pointings and Patterns

SAME ALIGNMENT 20-30

SAME GUIDE STARS <exposure-list> (in APT replaced by Exposure Group containers in the APT User Interface)

See Exposure Containers: Exposure Sequences, Coordinated Parallels and Patterns and 7 Pointings and Patterns

SAME GUIDE STARS 10-20

GSPAIR <pair-id->

GSPAIR 0748300182F10000000000F0

OBSET ID <id>

OBSET ID A2

EXP PCS MODE [FINE | GYRO]

EXP PCS MODE FINE

GS ACQ SCENARIO [PAIR | SINGLE | GYRO | <scenario>]

GS ACQ SCENARIO SINGLE

For available but unsupported parameters

FORMATEXAMPLE

Target Acquisition Requirements

SAVE OFFSET <id>

SAVE OFFSET OFF-1

USE OFFSET <id>

USE OFFSET OFF-1

Special Observation Requirements

SAA CONTOUR <model number> (for WFC3, ACS/WFC and S/C modes; Restricted for ACS/SBC, CAL and ENG proposals)

SAA CONTOUR 02
QASISTATES <si> <detector> <start> <end> QASISTATES ACS ACS/WFC A1 B2
QESIPARM <parameter> <value>QESIPARM A1 B1
QELOGSHEET <parameter> <value> QELOGSHEET AP_1 B1

Timing Requirements

AFTER BY <time> [TO <time2>]

AFTER BY 15M to 16M

For restricted parameters

FORMATEXAMPLE
Target Acquisition Requirements

USE OFFSET <id> Use for any CALibration, ENGineering or SMOV program

USE OFFSET 9100-1

Special Observation Requirements

SPECial COMmanding [INSTR <NAME>]

SPEC COM INSTR ESPFORMAT


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Related Links

6.2 Visit-level Special Requirements




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