Special requirements provide flexibility in specifying the scheduling requirements of observations. Many Special Requirements, directly or indirectly, restrict the times when observations can be scheduled. These should be used to provide the schedulers at STScI with enough constraints to ensure that the observations are properly scheduled. Special Requirements should not be used unless necessary to accomplish the scientific objectives of the program.
The Special Requirements are summarized in Table 7.1: Supported Formats for Visit Level Special Requirements and Table 7.2: Supported Formats for Exposure Level Special Requirements, and a detailed description of each requirement is provided in the following subsections.
You should observe the following conventions and rules for Special Requirements:
If you are editing the Text Proposal File to modify your program, please observe these additional syntax rules:
FORMAT |
EXAMPLE |
---|---|
Guiding Requirements |
|
PCS MODE Fine |
|
PCS MODE Gyro |
|
GUIDing TOLerance <angle> (arcsec) |
GUID TOL 0.020" |
DROP TO GYRO IF NECESSARY |
|
NUMBER OF GYROS 2 |
|
Target Orientation Requirements |
|
ORIENT 18D TO 22D |
|
ORIENT 18D TO 22D FROM 5 |
|
SAME ORIENT AS 5 |
|
Special Observation Requirements |
|
CVZ |
|
SCHED 100% |
|
NOTRACK |
|
Timing Requirements |
|
AFTER 12-JUL-2001:12:06 |
|
AFTER 6 BY 7D TO 9D |
|
BEFORE 14-SEP-1999 |
|
BETWEEN 21-DEC-1999 AND 31-DEC-1999 |
|
GROUP 5-10 WITHIN 60D |
|
PERIOD 1.23H AND ZERO-PHASE (HJD) 2444000 |
|
SEQ Visits 5-7 WITHIN 24H |
|
VISIBILITY INTERVAL CORON |
|
Conditional Requirements |
|
ON HOLD FOR 15 |
FORMAT |
EXAMPLE |
---|---|
Target Acquisition Requirements |
|
No longer available; see text. |
|
USE OFFSET 9100-1 |
|
Target Position Requirements |
|
POS TARG +6.3,-8.1 |
|
SAME POS AS 6 |
|
PATTERN <#> [<exposure-list>] (Replaced by Pattern Containers in the APT User Interface)) |
PATTERN 5 1-4 |
Special Observation Requirements |
|
PAR 4-6 WITH 1-3 |
|
SAA CONTOUR 02 |
|
Special Communications Requirements |
|
RT ANALYSIS |
|
REQ UPLINK |
|
REQ EPHEM CORR OFF-13 |
|
Timing Requirements |
|
EXPAND |
|
LOW-SKY |
|
MAX DUR 115% |
|
MIN DUR 1800S |
|
PHASE 0.09 TO 0.11 |
|
SEQ 2-5 NON-INT |
|
SHADOW |
1This special requirement is supported only for config=ACS/HRC, mode=ACCUM exposures that use one of the coronagraphic spot apertures (HRC-CORON1.8, HRC-CORON3.0, HRC-SUB1.8). |
Space Telescope Science Institute http://www.stsci.edu Voice: (410) 338-1082 help@stsci.edu |