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  • 1
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    IRAS known asteroid prediction and association (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Techniques and procedures employed to obtain data concerning the known asteroids from IRAS observations are discussed. The IRAS observations covered 95 percent of the sky with at least four scans of the telescope field of view. A search was first carried out for geometrical intersections of the trajectories of a given asteroid and the telescope boresight, following which a matched sighting was sought for each such intersection among the actual IRAS point source detections. By using ground based measurements of visual magnitudes, IRAS observations of IR brightness, and a thermal model, albedos and diameters have been computed for 1,822 known asteroids, increasing the amount of this kind of information by about an order of magnitude.
    Keywords: ASTRONOMY
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 35; 287-299
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Tests of a multichannel photometer based on silicon diode detectors (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A breadboard photometer was constructed that demonstrates a precision of 2 times 10 to the 4th power in the laboratory and scintillation-limited performance when used with an 0.5 m aperture telescope. Because the detectors and preamps are not cooled, only stars with m sub v approx. less than 4 are bright enough to allow the photometer to attain a precision of 1 times 10 to the 3rd power for three minute observations with an 0.5 m aperature telescope. Cooling the telescope should allow much fainter stars to be observed. Increasing the aperture of the telescope will allow higher precision and the observation of fainter stars.
    Keywords: ASTRONOMY
    Type: Second Workshop on Improvements to Photometry; p 47-55
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Infrared ground-based astronomy with the Hughes 256 X 256 PtSi array (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It is shown that large format PtSi Schottky diode infrared arrays, the Hughes 256 X 256 hybrid Schottky array in particular, are competitive alternatives to the smaller format photovoltaic arrays for ground-based astronomy. The modest quantum efficiency of the PtSi compared to the photovoltaic devices is more than compensated for by the larger format. The use of hybrid technology yields effective fill factors of nearly 100 percent, and the low dark current, noise, excellent imaging characteristics, cost, and solid nitrogen operating temperature add to the effectiveness of this array for ground-based imaging. In addition to discussing the characteristics of this array, researchers present laboratory test data and astronomical results achieved at Kitt Peak.
    Keywords: ASTRONOMY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 237-246
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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