Chapter 3:
Fixed and Generic Targets

3.1 Target Identification

3.1.1 Target Number [Target_Number]

3.1.2 Target Name [Target_Name and Alternate_Names]

3.1.3 Target Category and Target Description [Description]

3.1.4 Target Extent [Extended] Required for COS observations only.

3.2 Target Coordinates

3.2.1 Required Accuracies of Target Positions

3.2.2 Target Position Type [Position]

3.2.3 Equatorial Coordinates

3.2.4 Positional Offsets

3.2.5 Region of Sky (Extended Targets)

3.2.6 Determining Coordinates in the Reference Frame Appropriate for HST Observations

3.2.7 Getting Coordinates from the GSC2 or DSS

3.2.8 Early Acquisitions

3.2.9 Equinox for Coordinates [Equinox]

3.2.10 Coordinate Reference Frame [Reference_Frame]

3.2.11 Is Proper Motion or Parallax Relevant?

3.3 Target Brightness and Bright Object Checking

3.3.1 Flux Data [Flux and Other_Fluxes]

3.3.2 Radial Velocity or Redshift [RV_ or _Z]

3.3.3 Bright-Object Constraints

3.4 Comments [Comments]

3.5 Generic Targets [Generic_Targets]

3.5.1 Target Number(s) [Target_Number]

3.5.2 Target Name [Target_Name]

3.5.3 Target Description [Description]

3.5.4 Flux Data [Flux]

3.5.5 Comments [Comments]

3.5.6 Generic Target Specifications [Criteria]

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, Bright-Object Constraints