4.2 Target Identification

4.2.1 Target Number [Target_Number]

4.2.2 Target Name [Target_Name]

4.2.3 Target Description [Description]

The following information is required to identify and classify each target.

4.2.1 Target Number [Target_Number]

Each target in your program will be assigned its own unique number (which can be changed by the user) by APT (they are base 10 and go from 1 to 999). Target numbers must be positive, monotonically increasing integers. You should define a different target whenever a different target position or timing description is required. For example, separate targets should be defined if you plan to take spectra of several different surface features on a planet, or if you plan to observe the same feature with different timing constraints.

4.2.2 Target Name [Target_Name]

The name is used to identify a target; all target names within a proposal must be unique. The target name can be selected from the STScI list of standard targets (see Table 4.1; explanations of “Level 1” and “Level 2” are given below), or a name can be defined by the GO. The use of standard names is encouraged whenever possible.

The following conventions should be followed in naming targets:

•	The length of a target name can be anywhere from 2 to 31 characters.

•	No blanks are permitted in target names. A hyphen should replace blanks that would normally be used to separate fields (e.g. IO-TORUS, COMET-BRADFIELD-1979X).

•	Only letters and numerals are allowed in target names; punctuation (other than hyphens and + or –) is not permitted.

•	Construct target names so they make sense for your observing program. For example, if your program consisted of consecutive observations of three surface features on Mars, then three appropriate target names might be: MARS-FEATURE1, MARS-FEATURE2, and MARS-FEATURE3.

Do not use just a standard name for a target when a specific portion of a body is being observed. For example, do not use “Saturn” as the target name for a feature or specific location that is defined relative to the position of Saturn as a standard target because this is confusing for the software that computes the positions of moving targets.

 

Table 4.1: Solar System Standard Targets 

Level 1	Level 2
Sun
Mercury
Venus
Earth	Moon	Hubble
Mars	Phobos	Deimos
Jupiter	Io	Europa	Ganymede
	Callisto	Amalthea	Himalia
	Elara	Pasiphae	Sinope
	Lysithea	Carme	Ananke
	Leda	Thebe	Adrastea
	Metis	Callirrhoe	Themisto
	Taygete	Chaldene	Harpalyke
	Kalyke	Iocaste	Erinome
	Isonoe	Praxidike	Autonoe
	Thyone	Hermippe	Aitne
	Eurydome	Euanthe	Euporie
	Orthosie	Sponde	Kale
	Megaclite	Pasithee	Hegemone
	Mneme	Aoede	Thelxinoe