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Special Requirements

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



Anthony P. Krueger
12/6/2000