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Author: Stephan D. Price
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 90
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Book Description
Positions and magnitude measurements at effective wavelengths of 4.2, 11.0, 19.8, and 27.4 micrometers are reported for an additional 2477 sources observed during the AFGL survey program. These sources were obtained by relaxing the stringent selection criteria used for the main catalog and subjectively selecting those that have associations and/or other characteristics which make them of interest for future investigation.
Author: Stephan D. Price
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 90
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Book Description
Positions and magnitude measurements at effective wavelengths of 4.2, 11.0, 19.8, and 27.4 micrometers are reported for an additional 2477 sources observed during the AFGL survey program. These sources were obtained by relaxing the stringent selection criteria used for the main catalog and subjectively selecting those that have associations and/or other characteristics which make them of interest for future investigation.
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: Daniel Y. Gezari
Publisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 578
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Book Description
Author: Daniel Y. Gezari
Publisher:
ISBN:
Category : Infrared astronomy
Languages : en
Pages : 358
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Book Description
Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 370
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Book Description
Author:
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 810
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Book Description
Author: Monroe Schlessinger
Publisher: Routledge
ISBN: 1351438344
Category : Science
Languages : en
Pages : 488
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Book Description
This work provides a basic understanding of the physical background and engineering considerations required for the design of IR systems, examining all components and combining them into examples of current surveillance systems. This second edition presents: new coverage of state-of-the-art optical systems, including lightweight mirrors and adaptiv
Author: Astronomical Data Center (U.S.)
Publisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 500
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Book Description
Author: Daniel Y. Gezari
Publisher:
ISBN:
Category : Infrared astronomy
Languages : en
Pages : 410
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Book Description
The catalog contains about 210,000 observations of roughly 20,000 individual sources, and supporting appendices. The literature search is complete for years 1965 through 1990.
Author: Neill I. Reid
Publisher: Springer Science & Business Media
ISBN: 1447136632
Category : Science
Languages : en
Pages : 492
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Book Description
Perhaps the most common question that a child asks when he or she sees the night sky from a dark site for the first time is: 'How many stars are there?' This happens to be a question which has exercised the intellectual skills of many astronomers over the course of most of the last century, including, for the last two decades, one of the authors of this text. Until recently, the most accurate answer was 'We are not certain, but there is a good chance that almost all of them are M dwarfs. ' Within the last three years, results from new sky-surveys - particularly the first deep surveys at near infrared wavelengths - have provided a breakthrough in this subject, solidifying our census of the lowest-mass stars and identifying large numbers of the hitherto almost mythical substellar-mass brown dwarfs. These extremely low-luminosity objects are the central subjects of this book, and the subtitle should be interpreted accordingly. The expression 'low-mass stars' carries a wide range of meanings in the astronomical literature, but is most frequently taken to refer to objects with masses comparable with that of the Sun - F and G dwarfs, and their red giant descendants. While this definition is eminently reasonable for the average extragalactic astronomer, our discussion centres on M dwarfs, with masses of no more than 60% that of the Sun, and extends to 'failed stars' - objects with insufficient mass to ignite central hydrogen fusion.
