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.

Expand/Collapse all...


Chapter Contents


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.

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.

(lightbulb) 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

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.

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

counterclockwise arrows button EXP PCS MODE=GYRO is not possible under Reduced Gyro Mode

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

GS ACQ SCENARIO SINGLE

counterclockwise arrows button Many Scenarios are not possible under Reduced Gyro Mode (and a few have been added)

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

 

Expand/Collapse all...



Table of Contents