Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..331..448f&link_type=abstract
IN: Instrumentation in astronomy IV; Proceedings of the Fourth Conference, Tucson, AZ, March 8-10, 1982 (A83-31976 14-35). Belli
Astronomy and Astrophysics
Astronomy
Astrometry, Astronomical Photometry, Electrophotometers, Accuracy, Fourier Transformation, Gratings (Spectra)
Scientific paper
Three instruments which apply photoelectric technique to differential astrometry are described. The current status of one of these, which employs a rotating Ronchi linear grid and is called the Astrometric Multiplexing Area Scanner (AMAS), is discussed in detail. A relatively simple expression for the discrete Fourier transform of the signal from a single star is derived. Presently, AMAS achieves an accuracy of about + or 2 microns in each coordinate, which is very nearly that achieved by conventional techniques. The advantage of AMAS is that it measures both coordinates simultaneously and observes through a B and V filter. Integration times on a 3/4 meter telescope are typically one or two minutes with an 11th magnitude sky-set (V) limit. Two other instruments, the Photoelectric Parallax Scanner and the Multichannel Astrometric Photometer, are briefly discussed.
Fredrick Laurence W.
Smith Daniel C.
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