Multiresolution-element imaging of extrasolar Earthlike planets

Details Multiresolution-element imaging of extrasolar Earthlike planets Multiresolution-element imaging of extrasolar Earthlike planets

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.9309b&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue E4, p. 9309-9312

Physics

5

Planetology: Solid Surface Planets: Remote Sensing, Planetology: Solid Surface Planets: Surface Materials And Properties, Planetology: Solid Surface Planets: Atmospheres-Structure And Dynamics, Planetology: Solid Surface Planets: Origin And Evolution

Scientific paper

It has been suggested recently that imaging of extrasolar Earthlike planets should be considered as a possible future goal of the NASA space program. As an aid to discussing what would be required in order to undertake imaging, a partial design is described for a separated spacecraft interferometer which could achieve images in the visible with 10 resolution elements across the planet. Between 15 and 25 large collector telescopes or clusters of telescopes spread out over roughly a 200-km baseline in solar orbit at 1 AU from the Sun or possibly in high Earth orbit are required. A very preliminary approach to the use of multispectral remote sensing techniques is discussed also. Finally, the generalization of this approach to larger numbers of resolution elements across the planet is considered. Clearly, imaging is possible only if the truly staggering problem of avoiding the 1010 times stronger scattered light from the nearby star can be overcome. However, even if this can be done, the amount and precision of the required hardware for even poor-quality images appears to present an obstacle to such a program which would be extremely difficult to overcome.

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