VI/103 The Hopkins Ultraviolet Telescope (HUT) (GSFC, 1990-95)
The Hopkins Ultraviolet Telescope
Hopkins Ultraviolet Telescope Team
<Johns Hopkins University (1990, 1995)>
ADC_Keywords: Spectra, ultraviolet ; Observatory log
Mission_Name: HUT
Description:
The Hopkins Ultraviolet Telescope HUT was one of three ultraviolet
instruments of the ASTRO-1 mission flown on the space shuttle Columbia
during 2-10 December 1990. 106 spectrophotometric observations of 77
targets were obtained in the far-UV (i.e., 912-1850Å) at a
resolution of ∼3Å. A few sources were observed in the 415-912Å
region with a 1.5Å resolution. The same three instruments were
later flown on the space shuttle Endeavour from 3-17 March 1995 as
part of the ASTRO-2 mission. During the longer ASTRO-2 mission, 385
observations of 265 targets were obtained.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hutlist.dat 170 643 HUT Observation Log
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See also:
http://praxis.pha.jhu.edu/hut.html : the HUT Home page
http://archive.stsci.edu/hut/ : the HUT at STScI.
Byte-by-byte Description of file: hutlist.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Target Name of the target as specified by HUT mission
10- 18 F9.5 deg RAdeg RA in J2000 decimal degrees
20- 28 F9.5 deg DEdeg DEC in J2000 decimal degrees
30- 37 A8 --- Pointid ASTRO Pointid (1)
39- 42 I4 --- Jotfid The first 4 digits of Pointid (1)
44- 79 A36 --- Category Translation of the the Science class (1)
80- 83 I4 yr Start.Y GMT date/time of starting observation (year)
84 A1 --- --- [-]
85- 86 I2 "month" Start.M GMT date/time of starting observation (month)
87 A1 --- --- [-]
88- 89 I2 d Start.D GMT date/time of starting observation (day)
90 A1 --- --- [T]
91- 92 I2 h Start.h GMT date/time of starting observation (hour)
93 A1 --- --- [:]
94- 95 I2 min Start.m GMT date/time of starting observation (minute)
96 A1 --- --- [:]
97- 98 I2 s Start.s GMT date/time of starting observation (second)
100-103 I4 s ExpTime The total exposure times in seconds. (2)
105-108 I4 s ExpDay Exposure time spacecraft day
110-113 I4 s ExpNight Exposure time during spacecraft night
115 I1 --- Door [1,7] Shutter Door State (4)
117 I1 --- Slit [0,7] Slit Position (5)
119-153 A35 --- Comments Comment generally related to S/N (3)
157 I1 --- ASTRO [1,2] Astro mission number
159-170 A12 --- Dataset Identification that identifies the dataset
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Note (1): All three ASTRO missions assigned a unique pointing ID
for each target
Digit one - Science Class (see "Science Classes" section below)
Digit two - Science Subclass (see "Science Classes" section below)
Digits 3/4 - Target Numbers within Subclass
Digit 5 - n => nth pointing at target with different roll or offset
Digit 6 - 0 => only one pointing for target
n => nth pointing
Digits 5 and 6 often not available (a question mark is used)
Note (2): the times do not reflect pointing problems. In many cases,
the target was not in the aperture.
Note (3): HUT-1 data includes a comment which usually refers to the
quality of the signal-to-noise ratio (not available for HUT-2 data.)
Note (4): Shutter Door State
To observe brighter stars, the HUT telescope aperture could be reduced
by closing one or two semi-circular shutter doors (full aperture size
was 5120 cm2), and by opening either of two small apertures (although
the 1 cm2 aperture was not employed during either mission). Changes
made in HUT-2 software allowed 2 additional modes in which the shutter
doors were partially closed. All the possible values are shown below:
The values are:
1 = 1 cm2 small aperture
2 = 50 cm2 small aperture
3 = half aperture
4 = half aperture
5 = full aperture
6 = partial aperture 3.9% of full aperture
7 = partial aperture 14.6% of full aperture
Note (5): Slit Positions
Used to describe one of 8 aperture sizes and/or filters combinations
as shown in the table below . The Al filter was used to reject first
order FUV light and provide a pure EUV bandpass (i.e., 415-700Å),
while the CaF2 filter excluded Lyman-alpha and all wavelengths below
1250Å. Note the aperture selection was revised for HUT-2, so the
values in the database table have different meanings depending on
which mission is referenced.
The values are:
-----------------------------------------------
HUT-1 HUT-2
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0 closed closed
1 30" diameter 12" diameter
2 9"x116" 32" diameter
3 30" Al filter 32" diameter Al filter
4 calibration hole calibration hole
5 18"x116" CaF2 filter 19"x197"
6 18"x116" 10"x56"
7 18" diameter 20" diameter
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Science Classes: the hierarchy of the classification is the following:
0 Calibration
0.0 HUT Camera Sensitivity Targets
0.1 HUT Spectrometer Focus Targets
0.2 HUT
0.3 UIT Flat Field Sources
0.4 UIT
0.5 WUPPE Aperture Position Calibrators
0.6 WUPPE Unpolarized & Polarized Standards
0.7 BBXRT Calibration Sources
0.8 BBXRT
0.9 Joint Focus and Alignment Targets
1 Solar System Objects
1.1 Comets
1.2 Planets
1.3 Asteroids, etc.
2 Individual Stars
2.1 Supergiants
2.2 Oe/Be Stars
2.3 Wolf-Rayet Stars
2.4 Rapid Rotators
2.5 Normal White Dwarfs
2.6 Magnetic/Pulsating W.D.'s
2.7 Planetary Nebula Nuclei
2.8 Normal Stars A0 & Later
3 Variable and Binary Stars
3.1 Pre-Main Sequence Stars
3.2 Cataclysmic Variables
3.3 Interacting Binaries
3.4 Symbiotic Stars
3.5 Active Chromospheres
3.6 Pulsating Variables
3.7 Low Mass X-Ray Binaries
3.8 High Mass X-Ray Binaries
3.9 X-Ray Transients
4 ISM & Nebulae
4.1 Planetary Nebulae
4.2 Reflection Nebulae
4.3 H II Regions
4.4 Super Nova Remnants
4.5 I.S. Polarization Probes
4.6 I.S. Absorption Probes (Nearby & Hot)
4.7 Herbig-Haro Objects
4.8 Dark Clouds
4.9 Diffuse Galactic X-Ray Emission Regions
5 Star Clusters
5.1 Metal Poor Globulars
5.2 Metal Rich Globulars
5.3 Open (Galactic) Clusters
5.4 O/B Associations
6 Normal Galaxies
6.1 Nearby Galaxies
6.2 Spirals
6.3 Ellipticals
6.4 Irregulars
6.5 Dwarfs
6.6 Edge On Systems
7 Abnormal Galaxies
7.1 Interacting Galaxies
7.2 Amorphous Galaxies
7.3 Rapid Star Formation
7.4 W/Circumgalactic Matter
7.5 E/S0 with I.S. Matter
7 X-Ray Miscellany
7.6 X-Ray Background
7.7 Unidentified X-Ray Sources
8 Active Extragalactic
8.1 Seyfert I Galaxies
8.2 Seyfert II Galaxies
8.3 Radio Galaxies
8.4 Radio Loud Quasistellar Objects
8.5 Radio Quiet Quasistellar Objects
8.6 BL Lacertae Objects
8.7 LINERs
8.8 Optically Violent Variable (OVV) Quasars
9 Clusters of Galaxies
9.1 Spiral Poor Clusters
9.2 Spiral Rich Clusters
9.3 X-Ray Selected Clusters
9.4 Deep Survey Fields
9.5 Cooling Flow Clusters
9 Spacecraft Specific
9.7 TAPS Tests
9.8 Gyros/IMC/IPS
9.9 Waterdumps/Handovers
Acknowledgements:
Karen Levay
Randall Thompson
(End) Francois Ochsenbein [CDS] 28-Jun-2001