The Astro-2 observatory is flown on the
Space Shuttle and consists of three separate instruments.
All of these instruments work in the ultraviolet part of the spectrum
which can only be accessed by putting the instruments above
the atmosphere of the earth. These three instruments are:
The instrument cluster is contained in a single unit called the
instrument pointing system, pictured here:
Hopkins Ultraviolet Telescope -(HUT) : This
instrument is essentially an ultraviolet spectrometer with
sensitivity from 1000 -- 3000 Angstroms.
- The Ultraviolet Imaging Telescope - (UIT): This is an
imaging telescope with a very wide field. Its best sensitivity
is in the 1400 - 3200 Angstrom range.
- The Wisconsin Ultraviolet Polarimeter Photometer - (WUPPE):
Clearly the coolest acryonym of the group, this instrument is
a high speed photometer which can also measure the percentage of
polarization of the detected light.
- Individual members which comprise the HUT, UIT and WUPPE camps
must merrily coordinate together to insure the maximum
scientific return of the mission. Before the mission, several
simulations of this merriment are held in which
team members practice their coordination.
- The portion of the mission which involves
The University of Oregon deals with observations using the
Ultraviolet Imaging Telescope. This telescope has a diameter of
18 inches. Its overall field of view is a circle of diameter
40 arcminutes. Although the mirror is significantly smaller than
that of the Hubble Space Telescope, its significantly larger field
of view, by a fctor of 200(!), makes it suitable to do many
ultraviolet imaging projects that are not feasible with HST.
Adjustments to the instrument pointing system are made by the
mission crew and are critical to the overall scientific success
of this flight.
The Electronic Universe Project