Chapter 3:
Fixed and Generic Targets

In this Chapter . .

3.1 Target Number [Target_Number] 3.2 Target Name [Target_Name and Alternate_Names] 3.3 Target Category and Target Description [Description] 3.4 Target Position Type[Position] 3.5 Equinox for Coordinates [Equinox] 3.6 Coordinate Reference Frame [Reference_Frame] 3.7 Radial Velocity or Redshift [RV_ or _Z] 3.8 Is Proper Motion or Parallax Relevant? 3.9 Flux Data [Flux and Other_Fluxes] 3.10 Bright-Object Constraints 3.11 Comments [Comments] 3.12 Generic Targets List [Generic_Targets] 3.13 Getting Coordinates Coordinated

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Tables and Figures

Table 3.1: Designations of Special Targets

Table 3.2: Target Categories

Table 3.3: Descriptive Keywords for STAR and EXT-STAR

Table 3.4: Descriptive Keywords for STELLAR CLUSTER and EXT-CLUSTER

Table 3.5: Descriptive Keywords for GALAXY

Table 3.6: Descriptive Keywords for CLUSTER OF GALAXIES

Table 3.7: Descriptive Keywords for ISM and EXT-MEDIUM

Table 3.8: Descriptive Keywords for UNIDENTIFIED

Table 3.9: Descriptive Keywords for CALIBRATION

Table 3.10: Discrete Features and Descriptors for All Categories

Table 3.11: Required Coordinate Accuracies

Table 3.12: Formats for Specification of Target Flux Data

Table 3.13: Bright-Object Constraints

The use of "FIXED_TARGETS" and "GENERIC_TARGETS" are described in this chapter. To make the presentation of this material more concise, the section on solar system targets has been made into a separate chapter; see Chapter 4: Solar System Targets.

The Target List tells us where you wish to point HST and so must be filled out with care, precision, and accuracy. The Target List also provides the information that defines and describe the targets, and which was used to determine exposure times. Three different kinds of Target Lists exist for the following three classes of targets, but only the Target List(s) required for your proposal need be submitted:

• Fixed targets (all targets outside the solar system whose positions can be defined by specific celestial coordinates);
• Solar-system targets (all moving targets);
• Generic targets (targets defined by certain properties, rather than by specific coordinates).

In this chapter, each heading has a description followed by a keyword in square brackets (e.g., [Number]). Elsewhere, items in boldface (e.g., RA) show words or phrases that are used as APT Phase II keywords or properties. Items in <> brackets (e.g., <value>) show values you provide. Values of items listed in square brackets (e.g., [A1: <value>]) are optional, whereas those not in square brackets are required. As you enter information in the APT interface, you will be told (via a tooltips message) if an item is required.