Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jbis...38..379c&link_type=abstract
British Interplanetary Society, Journal (Space Chronicle) (ISSN 0007-084X), vol. 38, Aug. 1985, p. 379, 380.
Astronomy and Astrophysics
Astronomy
Astrometry, Astronomical Photometry, Extrasolar Planets, Planetology, Occultation, Stellar Atmospheres, Stellar Color, Telescopes, Ubv Spectra, Planets, Photometry, Techniques, Procedure, Equipment, Observations, Astronomy, Emissions, Decameter Waves, Thermal Properties, Atmosphere, Astrometry, Earth-Based Observations
Scientific paper
Astrometric and photometric techniques are assessed for searching for extrasolar planets. Conventional photometry could be used to detect any diminution of brightness of a star caused by the transit of a planet as relatively large as Jupiter across the face of a star. The search would need to be automated, using a number of telescopes, to scan the 10,000-100,000 stars necessary for a probable success. A two-color method would lower the probability of atmospheric effects causing the aberration. The blue, then red shifts observed would be valid only if the viewing instruments had a high degree of stability. In a different vein, large, earth-orbiting or lunar-based telescopes could make direct observations possible. Earth-based spectroscopy is not considered to be able to gain high enough resolution to reveal extrasolar planets around a star, although it is possible to predict the spectral bands which would be exhibited by earth-like objects.
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