|| Dr. Arthur F. Davidsen
||The Johns Hopkins University
||90-centimeter (36-inch) aperture, f/2 focal ratio,|
silicon carbide-coated, parabolic mirror
||Prime-focus, Rowland-circle design using a|
600 line/mm grating coated with silicon carbide
||825 to 1850 angstroms (first order)|
|420 to 925 angstroms (second order)|
|cesium iodide photocathode|
|1024 element photo-diode array detector
||1 ms in high time mode|
|2 s in histogram mode|
|Dark Count Rate:
|Peak Effective Area:
|| 35 sq. cm at 1200 angstroms
||S/N of 10 per Angstrom in 1800 s
for Flambda=3.3e-14 ergs/cm2/s/A
||789 kilograms (1736 pounds)
||1.1 meter (4 feet) diameter|
|3.7 meters (12 feet) length
|Field of View of Guide TV:
|| 10 arc-minutes
The Hopkins Ultraviolet Telescope (HUT) was designed and built by
members of the Center for Astrophysical Sciences and the Applied Physics
Laboratory of The Johns Hopkins University in Baltimore,
Maryland. HUT consists of a 90-centimeter
(36-inch) f/2 mirror that focuses light from celestial sources onto a prime
Covering the 825-1850-angstrom region with about 3-angstrom resolution,
HUT opened the astrophysically important 912 to 1200-angstrom window to
detailed scrutiny for the first time.
In typical 1800 s integrations, HUT observed faint astronomical objects
with visual magnitudes of about 16.
Originally designed to explore the far- and extreme-ultraviolet ranges
on Astro-1, HUT was modified for Astro-2 to concentrate on the
far-ultraviolet. The changes made to HUT for Astro-2 included a new
detector system and new silicon carbide coatings on the mirror and
grating which replaced the original iridium and osmium.
These improvements provided a factor
of 2.3 increase in sensitivity in the primary operating range of 825 to 1850
angstroms, especially in the 912- to 1200-angstrom region unique to HUT.
This page taken from HUT Project web site.