4.12 Examples of Target List Blocks

The sample targets defined in this section are provided as examples of completed forms using the syntax described in these instructions. This collection does not provide an example for every type of keyword but does give a good overall representation of the types of target selections that can be accommodated. Numerical data in these examples is fictional.

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Example 1: In this example the proposer wants to perform spectroscopy of a volcano on Io. The position of the target is given in planetographic coordinates. The proposer also wants to observe the target when it lies close to the central meridian and, thus, uses CML to specify the allowable range of the central meridian longitude.

Target_Number:	1
Name:	IO-VOLCANO
Description:	FEATURE IO
Level_1:	STD = JUPITER
Level_2:	STD = IO
Level_3:	TYPE = PGRAPHIC,
	LONG = 310,
	LAT = 13
Window:	CML OF IO FROM EARTH BETWEEN 280 340
Flux:	SURF(V) = 5 +/– 0.5,
	SURF-CONT(2300) = 5.2 +/– 0.2 E–14,
	SIZE = 1.0
Comments:	Observe IO volcano Loki when it is near the central meridian.

•	Example 2: In this example the proposer wants to perform spectroscopy of the western ansa of the Io torus when Io is near greatest eastern elongation. The elongation condition is specified using the OLG keyword.

Target_Number:	2
Name:	IO-TORUS
Description:	TORUS JUPITER
Level_1:	STD = JUPITER
Level_2:	TYPE = TORUS,
	LONG = 90,
	LAT = 0,
	RAD = 4.3E5
Window:	OLG OF IO BETWEEN 90 100
Flux:	SURF-LINE(1304) = 1 +/– 0.5E–13,
	W-LINE(1304) = 2 +/– 1,
	SIZE = 1
Comments:	West ansa of IO Torus when IO is at greatest eastern elongation.

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Example 3: In this example the proposer wants to perform spectroscopy in the tail of comet Halley near the time of the Giotto spacecraft encounter. The latest orbital elements for the comet have been supplied by the proposer and these will be used for the ephemeris generation. The POS_ANGLE target reference system is used to specify the tailward pointing.

Target_Number:	3
Name:	COMET-HALLEY-TAIL
Description:	OFFSET COMET HALLEY
Level_1:	TYPE = COMET,
	Q = 0.5871167,
	E = 0.9672815,
	I = 162.2397156,
	O = 58.144397,
	W = 111.8489075,
	T = 09-FEB-86:11:01:04,
	EPOCH = 01-MAR-86,
	EQUINOX=B1950
Level_2:	TYPE = POS_ANGLE,
	RAD = 30,
	ANG = 180,
	REF = SUN
Flux:	SURF(V) = 12 +/– 1,
	SURF-LINE(1216) = 3.1 +/– 0.5E10,
	W-LINE(1216) = 0.1 +/– 0.5,
	SIZE = 1
Comments:	30 arcsec into tail of Halley during Giotto encounter. New orbital elements based on recent observations are provided.