U S Naval Observatory Optical Interferometer Project Az Ca

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U S Naval Observatory Optical Interferometer Project Az Ca

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Author :
language : en
Publisher:
Release Date : 1992

U S Naval Observatory Optical Interferometer Project Az Ca written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

The Navy Prototype Optical Interferometer

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Author : John Thomas Armstrong
language : en
Publisher:
Release Date : 1998

The Navy Prototype Optical Interferometer written by John Thomas Armstrong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Astrometry categories.

We describe the Navy Prototype Optical Interferometer (NPOI), a joint project of the Naval Research Laboratory (NRL) and the US Naval Observatory (USNO) in cooperation with Lowell Observatory. The NPOI has recently begun operations at the Lowell Observatory site near Flagstaff, Arizona, obtaining its first images, of a binary star, in 1996 May and June and its first limb-darkening observations during 1996 November to 1997 February. This paper gives an overview of the NPOI, including the characteristics of optical interferometry that affect its design. The NPOI includes subarrays for imaging and for astrometry. The imaging subarray consists of six moveable 50 cm siderostats feeding 12 cm apertures, with baseline lengths from 2.0 to 437 m. The astrometric subarray consists of four fixed 50 cm siderostats feeding 12 cm apertures (35 cm apertures to be installed in 1998), with baseline lengths from 19 m to 38 m. The shared back end covers 450-850 nm in 32 channels. The NPOI features vacuum feed and delay systems, active group-delay fringe tracking, and a high degree of automation. The astrometric subarray also includes an extensive site laser metrology system to measure the motions of the siderostats with respect to one another and to the bedrock. For imaging stellar surfaces, arrays with equal spacing between elements are superior to arrays that have been laid out to optimize (u, v) coverage and that therefore have unequal spacing. The imaging subarray of the NPOI provides a number of equally spaced configurations with linear scales at ratios of 1.64. Unequally spaced configurations are available for a variety of other imaging programs. Coherence across either type of imaging configuration is maintained by phase bootstrapping: the phases on the longest baselines, on which fringes may be too weak to track, are stabilized by tracking fringes on the shortest baselines.

Description Of The U S Naval Observatory Astrometric Interferometer

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Author :
language : en
Publisher:
Release Date : 1990

Description Of The U S Naval Observatory Astrometric Interferometer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Astronomical spectroscopy categories.

United States Naval Observatory Astrometric Interferometer

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Author : Donald John Hutter
language : en
Publisher:
Release Date : 1994

United States Naval Observatory Astrometric Interferometer written by Donald John Hutter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Astrometry categories.

The U.S. Naval Observatory Astrometric Interferometer (AI) is the dedicated astrometric subarray of the new Navy Prototype Optical Interferometer (NPOI) at Lowell Observatory, which is being built in collaboration with the Naval Research Laboratory. The Naval Research Laboratory is constructing the imaging subarray of the NPOI, the 'Big Optical Array' (BOA). The AI will be in operation on Anderson Mesa, near Flagstaff, Arizona, in the spring of 1994. The AI was built using the experience gained from the Mark III Interferometer on Mt. Wilson, CA, which demonstrated 'proof of concept' of wide-angle astrometry by a long baseline optical interferometer. The AI incorporates four siderostats that are located in a Y-shaped configuration, and features a full-array laser metrology system to monitor baseline motion. The AI shares with the BOA state-of-the-art delay lines and a real-time zero- order fringe tracking system. The AI will have a limiting magnitude of 10 and will produce star positions accurate to a few milliarcseconds (mas). With a planned operational lifetime of several decades, this instrument will be capable of maintaining the HIPPARCOS reference frame through repeated observations, yielding improved proper motions of thousands of the brighter HIPPARCOS stars.

Federal Register

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Author :
language : en
Publisher:
Release Date : 1992-08-20

Federal Register written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-08-20 with Administrative law categories.

Very High Angular Resolution Imaging

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Author : J.G. Robertson
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-12-01

Very High Angular Resolution Imaging written by J.G. Robertson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-01 with Science categories.

The 1990s are proving to be a very exciting p&iod for high angular resolution astronomy. At radio wavelengths a combination of new array instruments and pow erful imaging algorithms have generated images of unprecedented resolution and quality. In the optical and infrared, the great technical difficulties associated with constructing separated-aperture interferometers have been largely overcome, and many new instruments are now operating or are being developed. As these pro grams start to produce observational results they will be able to draw extensively on the experience gained by the radio-interferometry community. Thus it seemed that the time was ripe for a meeting which would bring together workers from all wavelength ranges to discuss the details of the science and art of "Very High Angular Resolution Imaging" . While the main emphasis of Symposium No. 158 was on high resolution tech niques from the radio, mm-wave, infrared and optical bands, it also provided an opportunity for presentation of astronomical results from these techniques. As well as giving our colleagues from the Northern Hemisphere a break from midwinter, the location of the Symposium in Australia recognised the continuing development of astronomical interferometry in this country, especially the recent completion of the Australia Telescope radio array, and the progress toward com missioning of the Sydney University Stellar Interferometer. A number of the par ticipants visited these instruments during the post-symposium tour.

The Outrigger Telescopes Project Mauna Kea Science Reserve

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Author :
language : en
Publisher:
Release Date : 2005

The Outrigger Telescopes Project Mauna Kea Science Reserve written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

The Role Of Vlbi In Astrophysics Astrometry And Geodesy

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Author : Franco Mantovani
language : en
Publisher: Springer Science & Business Media
Release Date : 2004-06-22

The Role Of Vlbi In Astrophysics Astrometry And Geodesy written by Franco Mantovani and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-06-22 with Science categories.

A masterly survey of the last 13 years of Very Long Baseline Interferometry, reviewed in light of the most advanced astronomical observations. Topics covered include: Nonthermal emission from extragalactic radio sources; Principles of synchrotron emission in relation to astrophysics; Theory of relativistic jets; Young, powerful radio sources and their evolution; Scintillation in extragalactic radio sources; Radio and optical interferometry; Radio polarimetry; Unified schemes; Deep fields; Tropospheric and ionospheric phase calibration; Supernovae; VLBI for geodesy and geodynamics.

Phase 1 Construction Of The Navy Prototype Optical Interferometer

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Author :
language : en
Publisher:
Release Date : 1997

Phase 1 Construction Of The Navy Prototype Optical Interferometer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

This final technical report for contract N00014-91-C-2224 summarizes all work accomplished in the construction of the Navy Prototype Optical Interferometer (NPOI), Phase I. Reference is made to all environmental reports and permits, construction of roads, buildings, array piers, and power distribution. Quarterly reports, summary budget, job descriptions of personnel, and publications are included.

Astronomy With Optical Interferometers

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Author :
language : en
Publisher:
Release Date : 1990

Astronomy With Optical Interferometers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Interferometers categories.