3.3 Target Category and Target Description
[Description]

A target description must be selected for each target. The Target Description will be one of the key fields used by archival researchers in searching through the HST data archive; thus it is extremely important that the information be filled out completely and accurately for each target.

Each target must be assigned a single primary category from Table 3.2, and at least one descriptive keyword, chosen from the appropriate Table 3.3 through Table 3.9 (see Table 3.2 for which table is appropriate for each category). The discrete features and descriptors in Table 3.10 may be used as descriptive keywords for any category. A maximum of five descriptive keywords may be selected.

The categories in Table 3.2, and some of the descriptive keywords in Table 3.3 through Table 3.10, are followed by explanatory text in parentheses. This text is provided only for explanatory purposes and is not part of the category or keyword itself.

Text Proposal File

If you are using the Text Proposal File, target description items must be separated by commas.

Table 3.2: Target Categories

Category	Descriptive Keywords	Discrete Features and Descriptors
SOLAR SYSTEM (Solar System Object)	Chapter 4: Solar System Targets
STAR (Galactic Stellar Object)	Table 3.3	See Table 3.10
EXT-STAR (Star in an External Galaxy)	Table 3.3
STELLAR CLUSTER (Galactic Star Cluster, Group, or Association)	Table 3.4
EXT-CLUSTER (Star Cluster in an External Galaxy)	Table 3.4
GALAXY (Galaxy or AGN)	Table 3.5
CLUSTER OF GALAXIES (Galaxy Groupings, Clusters, Large-scale Structure)	Table 3.6
ISM (Interstellar Medium of the Galaxy)	Table 3.7
EXT-MEDIUM (Interstellar Medium of an External Galaxy)	Table 3.7
UNIDENTIFIED (Unidentified Objects)	Table 3.8
CALIBRATION (Calibration Observations)	Table 3.9

Table 3.3: Descriptive Keywords for STAR and EXT-STAR 

Brown Dwarf	F0-F2	Herbig Ae/Be
Wolf Rayet	F3-F9	Horizontal Branch Star
Wolf Rayet - WC	FP	Interacting Binary
Wolf Rayet - WN	Late-type Degenerate	X-ray Novae
Main Sequence O	G V-IV	X-ray Burster
Giant O	G III-I	X-ray Transient
Supergiant O	K V-IV	LMXB (Low Mass X-ray Binary)
OE	K III-I	Gamma Ray Burster
OF	M V-IV	MXB (Massive X-ray Binary)
SDO	M III-I	RS CVn Star
WDO	L	W UMa Star
B0-B2 V-IV	T	Beta Lyrae Star
B3-B5 V-IV	S Star	Algol System
B6-B9.5 V-IV	Carbon Star	Barium Star
B0-B2 III-I	Long Period Variable	Blue Straggler
B3-B5 III-I	Irregular Variable	Neutron Star
B6-B9.5 III-I	Regular Variable	Pulsar
BE	Luminous Blue Variable	Binary Pulsar
BP	Dwarf Nova	FK Comae Star
SDB	Classical Nova	Pulsating Variable
DB	Nova-like	PG1159 Star
DA	Recurrent Nova	ZZ Ceti Star
DC	Polar (AM Her Star)	Cepheid
DZ	Intermediate Polar (DQ Her Star)	Supernova
A0-A3 V-IV	Symbiotic Star	Supernova Type Ia
A4-A9 V-IV	T Tauri Star	Supernova Type Ib
A0-A3 III-I	FU Orionis Star	Supernova Type II
A4-A9 III-I	Shell Star	RR Lyrae Star
AE	Eta Carinae Star	Planetary Nebula Central Star
AM	YSO	Emission Line Star
AP	Extra-solar Planet	Circumstellar Matter
AGB Star	Extra-solar Planetary System
Post-AGB Star	Pre-main sequence Star	Population II
Composite Spectral Type	Low Mass Companion

Table 3.5: Descriptive Keywords for GALAXY

Spiral (Spiral Galaxy)	Quasar (Radio Loud)
Lenticular (Lenticular Galaxy)	Radio Galaxy
Elliptical (Elliptical Galaxy; Not A Dwarf Elliptical)	BL Lac (BL Lac or BLAZAR)
Dwarf Elliptical	Liner
Magellanic Irregular	Starburst
Amorphous Irregular	Ultraluminous IR Gal
Dwarf Compact (Dwarf Compact/HII Galaxy)	Interacting Galaxy
Dwarf Spheroidal	Lyman Alpha Cloud
BCM (Brightest Cluster Member)	Protogalaxy
BGM (Brightest Group Member)
LSB (Low Surface Brightness/HI Rich Galaxy)	Einstein Ring
Seyfert	High Redshift Galaxy (z > 0.5)
QSO (Radio Quiet)

Table 3.7: Descriptive Keywords for ISM and EXT-MEDIUM 

Herbig-Haro Object	Cometary Nebula
Planetary Nebula	Molecular Cloud
HII Region	Bipolar Outflow
Reflection Nebula	Absorption Line System
Dark Cloud	Absorption Line System - Galactic
SNR (Supernova Remnant)	Absorption Line System - Extragalactic
Ring Nebula	Damped Lyman Alpha Cloud (Extragalactic)
HI Cloud	Coronal Gas (105-106 K)
High Velocity Cloud	Hot Gas (107-108 K)
Intermediate Velocity Cloud	IGM
IRAS Cirrus	ICM
PDR (Photon Dominated Region)

Table 3.9: Descriptive Keywords for CALIBRATION 

Astrometric	Narrow Band Filter Calibration	Target Acquisition Test
Photometric	FGS Stability	Detector Sensitivity Test
Wavelength	Quantum Efficiency Test	Focus Test
Point Spread Function	Pointing and Jitter Test	Spacecraft Glow
Occulting Finger Location	Raster & Step/Dwell Scan Verification	Occultation Mode Test
Ion	Spatial Distortion Test	Throughput Test
Taled	Polarimetry	Echelle Blaze Function
Scattered Light Test	Aperture Location	Virtual Pointing
Sky Background	Detector Linearity Test	FGS Transfer Function Test
Instrument Sensitivity Test	Carrousel Stability Test	Shutter Control Test

Table 3.10: Discrete Features and Descriptors for All Categories 

Corona	Disk	BLR (Broad Line Region)
Ring	Bulge	NLR (Narrow Line Region)
Ansae	Polar Ring	Filament
Protoplanetary Disk	Dust Lane	Ejecta
Wind	Spiral Arm	Knot
Accretion Disk	Shell	Star Forming Region
Jet	Tidal Tail	Shock Front
Lobe	Bar	Ionization Front
Hotspot	Multiple Nuclei	Conduction Front
Nucleus	Cooling Flow	Undesignated
Halo	Emission Line Nebula	Gravitational Lens