Visit Special Requirements summary

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

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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.

More about Visit-level Special Requirements

Use the table below to go directly to information for a particular visit-level 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

FORMAT	EXAMPLE
Guiding Requirements
PCS MODE Fine	PCS MODE Fine
PCS MODE Gyro	PCS MODE Gyro	Not possible under Reduced Gyro Mode
GUIDing TOLernace <angle> (arcsec)	GUID TOL 0.020"	Not possible under Reduced Gyro Mode
DROP TO GYRO [NO REACQuisition]	DROP TO GYRO	Not possible under Reduced Gyro Mode
Special Observation Requirements
CVZ	CVZ	*Must be indicated in Phase 1 proposal*
SCHEDulability <percentage>	SCHED 100%	Default has changed to 70% due to Reduced Gyro Mode
NOTRACK	NOTRACK
TARGET OF OPPORTUNITY RESPONSE TIME <time>	TARGET OF OPPORTUNITY RESPONSE TIME 24.0H	*Must be indicated in Phase 1 proposal*
TARGET OF OPPORTUNITY FLEX DAY (FLEXIBLE THURSDAY)	TARGET OF OPPORTUNITY FLEX DAY (FLEXIBLE THURSDAY)	*Must be indicated in Phase 1 proposal*
Conditional Requirements
ON HOLD FOR [<visit>]	ON HOLD FOR 15	*Must be indicated in Phase 1 proposal*
Target Orientation Requirements
ORIENTation <angle1> TO <angle2>	ORIENT 18° TO 22°	*Must be indicated in Phase 1 proposal*
ORIENTation <angle1> TO <angle2> FROM <visit>	ORIENT 18° TO 22° FROM 5	*Must be indicated in Phase 1 proposal*
SAME ORIENTation AS <visit>	SAME ORIENT AS 5	*Must be indicated in Phase 1 proposal*
Timing Requirements
AFTER <date>	AFTER 12-JUL-2001:12:06	*Must be indicated in Phase 1 proposal*
AFTER <visit> [BY <time1> TO <time2>]	AFTER 6 BY 7D TO 9D	*Must be indicated in Phase 1 proposal*
BEFORE <date>	BEFORE 14-SEP-1999	*Must be indicated in Phase 1 proposal*
BETWEEN <date1> AND <date2>	BETWEEN 21-DEC-1999 AND 31-DEC-1999	*Must be indicated in Phase 1 proposal*
GROUP <visits> WITHIN <time>	GROUP 5-10 WITHIN 60D	*Must be indicated in Phase 1 proposal*
PERIOD <time> ZERO-PHASE (HJD) <date>	PERIOD 1.23H AND ZERO-PHASE (HJD) 2444000	*Must be indicated in Phase 1 proposal*
SEQuence <visits-checked> WITHIN <time>	SEQ Visits 5-7 WITHIN 24H	*Must be indicated in Phase 1 proposal*
VISIBILITY INTERVAL CORON	VISIBILITY INTERVAL CORON	Not possible under Reduced Gyro Mode
VISIBILITY INTERVAL NO GYRO BIAS UPDATE ON MOVING TARGET	VISIBILITY INTERVAL NO GYRO BIAS UPDATE ON MOVING TARGET
Limited-Access Requirements
BRIGHT EARTH AVOIDance <angle in degrees>¹	BRIGHT EARTH AVOID 25
PARallel	PAR
GYRO MODE <value>	GYRO MODE 2G	Default and currently only possible value is 1G due to Reduced Gyro Mode

¹ The <angle in degrees> is currently limited to 25. All other angles from 0º to 90º are Restricted.

Change Log

Version Cycle 32 June 2024

PROPINST-91419 Document changes in availability of features due to change to RGM

Version Cycle 31 June-July 2023

PROPINST-91390 Add "Flexible Thursday" Target of Opportunity

Version Cycle 30 April 2022

PROPINST-91383 Emphasize which special requirements should have been preapproved in Phase I (Added to table)

Version Cycle 29 April 2021

PROPINST-91379 - VISIBILITY INTERVAL MOVING TARGET

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6.2 Visit-level Special Requirements

Visit Special Requirements summary

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

Sections

Format definitions

More about Visit-level Special Requirements

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