Computer Science
Scientific paper
Jan 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962saosr..83.....d&link_type=abstract
SAO Special Report #83 (1962)
Computer Science
1
Scientific paper
Project Celescope's goal is to obtain an all-sky map in three ultraviolet colors (between 1000-3000 Å) to a limiting magnitude of 10.0 for stars and to a limiting sensitivity that gives clear pictures of the ultraviolet nebulosities. This stellar limit should provide data on about 100,000 stars, virtually all of which are expected to be F-type or earlier. To obtain the all-sky map, three broadband photometers and a slitless spectroscope will be used with a television camera tube system. The slitless spectroscope will enable plotting the continuous spectra of the brighter stars (about 5000) through about 100 points, whereas the broadband equipment will permit plotting three points on the continuous spectra of a much greater n greater number of stars (about 100, 000). Heart of the Celescope system is a television camera Uvicon tube to be used as a detector. An optical system, using a Schwarzschild camera with primary and Secondary mirrors, is designed to suit tube configuration. A mechanical system is being designed to hold the optical elements in place and an electronic system to operate Celescope's television cameras by remote control from the ground. Two methods of handling the television photometric data o obtained are anticipated. For the stellar mapping, the data will be transmitted in digital from, thus retaining the resolution capabilities of the camera tube (position resolution of 30 sec of arc, intensity resolution of 0.1 magnitude). This data- handling system treats nebulosities as noise that is filtered out prior to transmission. For nebular mapping, sensitivity must be increased at the expense of both angular and intensity resolution by using the longest exposure time available (about 30 sec) and the minimum acceptable resolution (about 2 to 4 min of arc, with intensity corresponding to about 20 shades of gray). The nebular picture will be transmitted by analog techniques. Besides an all-sky map, a byproduct of Project Celescope will be information on stellar atmospheres (temperatures, densities, and chemical composition), interstellar absorption, and measurement of the ultraviolet radiation of the solar and earth's atmospheres. The spacecraft that will carry Celescope is programmed so that the optic axis will never come within 45° of the sun and is equipped with a sun shield that closes if this limit is exceeded, since direct solar illumination would destroy the television detector. During an active pass of the spacecraft over the ground station, only two commands are required to initiate a desired sequence of Celescope operation.
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