With the APT several special requirements can be specified in a purely visually manner, such as orientation in the Visual Target Tuner. However, in all cases users can specify the option from a spreadsheet view, where they will typically be provided textually through menu choices.
The table below lists the special requirements, the number of proposals that used the requirement in Cycle 8 which had 436 proposals, and the means of specification in APT. Notice that the more frequently used special requirements can generally be specified graphically. In that case, the user need not think of these specifications in terms of "special requirements". However, they will be listed as such in other views, such as the spreadsheet view. Furthermore, they will be listed as special requirements in the report on the proposal (as currently provided by the Description Generator).
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VISIT/EXPOSURE LEVEL SPEC REQS FOR CYCLE 8 PROPOSALS
TOTAL
SPECIAL REQUIREMENT PROPS APT INPUT/EDITING TOOLS
----------------------------------- ----- ------------------------
ORIENT 173 Textually & VTT
BETWEEN 103 Textually & visit planner
SCHED 88 Textually & visit planner
AFTER BY 57 Textually & visit planner
SAME ORIENT 43 Textually & visit planner
BEFORE 32 Textually & visit planner
GROUP WITHIN 32 Textually & visit planner
PCS MODE 30 Textually & visit planner
CVZ 30 Textually, orbit planner,
VTT
ON HOLD 28 Textually & visit status
tool (if tool happens)
SEQUENTIAL WITHIN 24 Textually & visit planner
PAR 21 Textually
VISIBILITY INTERVAL 15 Textually
ORIENT FROM 11 Textually & visit planner
PERIOD AND ZERO PHASE 7 Textually
ON HOLD FOR 6 Textually & visit
status tool (if tool happens)
AFTER 4 Textually & visit planner
GUID TOL 2 Textually
DROP TO GYRO IF NECESSARY 2 Textually
ORIENT FROM NOMINAL 1 Textually
DROP TO GYRO IF NECESSARY NO REACQ 1 Textually
POS TARG 143 Textually & VTT
MAX DUR 88 Textually & orbit planner
NO SPLIT 80 Textually & orbit planner
GS ACQ SCENARIO 71 Textually
ONBOARD ACQ 64
SEQ NON-INT 62 Textually & orbit planner
SAME POS 47 Textually & VTT
EXPAND 44 Textually
MIN DUR 28 Textually
PAR WITH 25 Textually & orbit planner
END ORBIT 25 Textually
SAME ALIGNMENT 23 Textually & orbit planner
LOW-SKY 11 Textually
NEW ALIGNMENT 9 Textually
NEW OBSET FULL ACQ 7 Textually
PHASE 7 Textually
REQ EPHEM CORR 6 Textually
SHADOW 4 Textually
RT ANALYSIS 3 Textually
SAA CONTOUR 3 Textually
REQ UPLINK 3 Textually
SAME OBSET 1 Textually
USE OFFSET 1 Textually
SAVE OFFSET 1 Textually
EXP PCS MODE 1 Textually
SAME GUIDE STARS 1 Textually
OBSET ID 1 Textually
NEW OBSET 1 Textually