A comparison of interferometry from space and ground

Details A comparison of interferometry from space and ground A comparison of interferometry from space and ground

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.273....5g&link_type=abstract

In ESA, ESA Workshop on Optical Interferometry in Space p 5-10 (SEE N88-10613 01-74)

Astronomy and Astrophysics

Astronomy

Interferometry, Space Observations (From Earth), Spaceborne Astronomy, Michelson Interferometers, Signal To Noise Ratios, Technology Assessment, Visible Spectrum

Scientific paper

It is argued that interferometry in space is superior to that from the ground only at visible frequencies. In the visible regime interferometry in space shows a clear advantage over interferometry from the ground only when observations on objects fainter than mv 10 are considered. To reach objects fainter than mv 14 in reasonable observation times (less than 1hr) it is shown that either: an extremely stable interferometer is required (uncalibrated errors less than lambda/6 over several seconds) or, a bright off-axis reference, mv less than 14, should be used to monitor errors in the (almost) common optical path. It is argued that mechanical tolerances on maintained geometry are fairly relaxed provided that they can be monitored to a very high precision.

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