Aspect Determination for the AFGL Infrared Survey Experiments PDF Download
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Author: Stephan D. Price
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 52
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Book Description
The AFGL probe borne infrared celestial survey experiments are designed to obtain the inertial aspect of the payload reference frame with an accuracly comparable to the spatial size of a resolution element in the infrared telescope. Constraining the axis of payload rotation to known inertial coordinates through maintaining lock onto a selected pole star with a star tracker co-aligned to the roll-axis, and by careful geometric alignment of the optical elements and dynamic balancing the payload, the desired accuracy was achieved. Further refinement in position was obtained from the stellar detections by the infrared sensor, with an ultimate knowledge of the inertial aspect being within 1.5 artc minutes root mean square deviation between the measured and catalogued positions for known infrared stars. The procedures used to obtain this accuracy are described. Also detailed is a method of aspect determination using only a star mapper with an N slit focal plane reticle. (Author).
Author: Stephan D. Price
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 52
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Book Description
The AFGL probe borne infrared celestial survey experiments are designed to obtain the inertial aspect of the payload reference frame with an accuracly comparable to the spatial size of a resolution element in the infrared telescope. Constraining the axis of payload rotation to known inertial coordinates through maintaining lock onto a selected pole star with a star tracker co-aligned to the roll-axis, and by careful geometric alignment of the optical elements and dynamic balancing the payload, the desired accuracy was achieved. Further refinement in position was obtained from the stellar detections by the infrared sensor, with an ultimate knowledge of the inertial aspect being within 1.5 artc minutes root mean square deviation between the measured and catalogued positions for known infrared stars. The procedures used to obtain this accuracy are described. Also detailed is a method of aspect determination using only a star mapper with an N slit focal plane reticle. (Author).
Author: Stephan D. Price
Publisher:
ISBN:
Category : Emission spectroscopy
Languages : en
Pages : 174
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Book Description
The AFGL Infrared Sky Survey data have been processed to deconvolve the low frequency attenuation, restoring the signals from extended sources. The 11 and 20-micrometer scans which cover three quarters of the galactic plane have been analyzed, with lesser area covered at 4 and 27 micrometers. A detailed description is given of the instrumentation, the conduct of the experiment, and the data reduction procedures. The measured extended emission in the 3- to 30-micrometer region may be divided into several components. A number of discrete, extended sources are observed within 5 deg of the galactic plane, the majority of which are associated with HII regions. About 25 percent of these sources are not in the AFGL catalog. A large scale diffuse emission is centered on the galactic plane at longitudes less than 90 deg from the galactic center. The 11 to 20-micrometer color ratio of this emission is distinctly smaller in the direction of the Perseus external arm and the Sagittarius-Carina spiral than closer to the center (1
Author: Stephan D. Price
Publisher:
ISBN:
Category : H II regions (Astrophysics)
Languages : en
Pages : 56
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Approximately 9000 square degrees of the celestial sphere was surveyed in four infrared bands with a rocket-probe-borne telescope. This Far Infrared Sky Survey Experiment (FIRSSE) covered the galactic plane between 120 degrees and 255 degrees longitude and the Orion and Taurus Molecular Clouds. A list of almost 300 bright 90 μm sources is presented along with associated measurements at 20, 27, and 40 μm. A description is given of the conduct of the experiment, the first space-borne use of super-fluid helium under active thermal loading.
Author:
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Category : Geophysics
Languages : en
Pages : 810
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Author: Stephan D. Price
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ISBN:
Category : Infrared astronomy
Languages : en
Pages : 170
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Author: Air Force Cambridge Research Laboratories (U.S.)
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ISBN:
Category : Geophysics
Languages : en
Pages : 228
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Author:
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ISBN:
Category : Aeronautical instruments
Languages : en
Pages : 304
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 1048
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 544
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Author:
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ISBN:
Category : Environmental geology
Languages : en
Pages : 402
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