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.

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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 Visit-level Special Requirements

(lightbulb) 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

FORMATEXAMPLE
Guiding Requirements
PCS MODE FinePCS MODE Fine
PCS MODE GyroPCS MODE Gyrocounterclockwise arrows button Not possible under Reduced Gyro Mode
GUIDing TOLernace <angle> (arcsec)GUID TOL 0.020"counterclockwise arrows button Not possible under Reduced Gyro Mode
DROP TO GYRO [NO REACQuisition]DROP TO GYROcounterclockwise arrows button Not possible under Reduced Gyro Mode
Special Observation Requirements
CVZ                                                                                                  
CVZMust be indicated in Phase 1 proposal
SCHEDulability <percentage>SCHED 100%counterclockwise arrows button Default has changed to 70% due to Reduced Gyro Mode
NOTRACKNOTRACK
TARGET OF OPPORTUNITY RESPONSE TIME <time>                   TARGET OF OPPORTUNITY RESPONSE TIME 24.0HMust 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 15Must 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

counterclockwise arrows button 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>1BRIGHT EARTH AVOID 25
PARallelPAR
GYRO MODE <value>GYRO MODE 2Gcounterclockwise arrows button 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.



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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