Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2106l&link_type=abstract
American Astronomical Society, DPS meeting #28, #21.06; Bulletin of the American Astronomical Society, Vol. 28, p.1135
Astronomy and Astrophysics
Astronomy
Scientific paper
The entry site of the Galileo Probe that entered Jupiter's atmosphere on December 7, 1995, posed a challenge of observing Jupiter within a few degrees of the Sun. With the thought that it should be easier to use a solar telescope to observe Jupiter in the visible light with the planet within 15deg of the Sun, use of the Solar Vacuum Tube Telescope of the Swedish Royal Academy of Sciences was pursued. The telescope is located on La Palma, Canary Islands at an altitude of about 2,400 m. The diffraction limited seeing from the telescope was previously demonstrated to approach 0.2 arcsec. It was determined that the telescope objective needed shielding from the direct sunlight to prevent stray reflections from the edges of the primary mirror when the objective was pointed at a target within about 10deg of the Sun, since the image of Jupiter was lost within the scattered light. A solar shade approximately 2.5 m long was quickly designed and constructed from the limited materials available locally. After some initial failures, an attempt at constructing a light, deformable shade was successful that reduced the background scattered light sufficiently to reveal Jupiter. Jupiter was imaged successfully between 24 November 1995, and 4 December 1995, whenever the weather cooperated. After that the weather conditions (fog, mist and high winds) precluded observations of Jupiter until the probe entry. Many thousands of images of Jupiter were acquired using B,V,R,I and Z filters as well as at narrow band filters at 750 and 829 nm. A few images were obtained at 893 and 945 nm. This work was supported by NASA Grant NCC2-854 and would not have been possible without the support and access provided by Prof. Goeran Scharmer, Stockholm University, and the staff of the Swedish Solar Telescope, Rolf Kever and Goeran Hosinsky.
Carsenty Uri
Limaye Sanjay S.
Warell Johan
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