Choose a target from the Target List provided. In the case of certain internal and external calibration sources, a special code must be used (see Tables 5.1 and 5.1). In general, calibration observations will be requested only rarely, since most calibrations will be carried out by STScI (see the Call for Proposals
).
Due to scheduling constraints, fixed external targets and solar system targets may not be used in the same visit. Also, none of the external calibration targets (EARTH-CALIB, ANTI-SUN, ORBIT-POLE-NORTH, ORBIT-POLE-SOUTH) may be used in the same visit with another external target.
The target name should be exactly as you entered it in the Target List (see 3.2 Target Name [Target_Name and Alternate_Names]). Only the prime target name is used; alternate names are not used.
If an internal calibration observation is requested on the Visit and Exposure Specifications, one of the specific "target" names in Table 5.1 must be chosen. The calibration source should not be chosen in the Target List. See the Call for Proposals
for discussions of the routine calibrations that will be performed by STScI. See the Instrument Handbooks
for further details of the calibrations for each instrument.
Name without including them in the Target List.
Specific astronomical objects used as external calibrators (e.g., standard stars) should be chosen in the Target List and Visit and Exposure Specifications as normal exposures, and the suffix -CALIB should be appended to their names, as discussed in 3.2.4 Special Targets.
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