Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974tsbb.nasa..190g&link_type=abstract
In NASA. Ames Res. Center Telescope Systems for Balloon-Borne Res. p 190-201 (SEE N75-12735 03-74)
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Balloon-Borne Instruments, High Altitude Balloons, Star Trackers, Ultraviolet Spectrometers, Data Acquisition, Equipment Specifications, Optical Equipment, Product Development
Scientific paper
The NASA Balloon-borne Ultraviolet Stellar Spectrometer (BUSS) which is carried to an altitude of 40 km by a 15 million cubic foot balloon for night-time observations of ultraviolet stellar spectra is discussed. The BUSS optical system, comprising an 0.40 m aperture Cassegrain telescope and an Ebert-Fastie spectrometer, points at various selected stars and focuses a portion of their spectra on the photocathode of an image dissector tube. The spectral region between 2,775 Angstroms and 2,825 Angstroms is sampled by the detector at 0.25 Angstroms increments using photon counting techniques. The pointing system for the payload uses a pair of orthogonal magnetometers which sense the earth's magnetic field for an aximuth reference, and a platform potentiometer for an elevation reference. This pointing system places the target star within the 3x1 degree field of view of an outer optical star tracker. The outer star tracker is then used to point the entire instrument to within one arc minute of the target star.
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