24 October 2000 Baffling system for the Wide Angle Camera (WAC) of ROSETTA mission
Author Affiliations +
Abstract
After the experience of GIOTTO fly-by to comet Halley in 1986, the European Space Agency planned to improve the scientific knowledge of these astronomical objects by means of an even more ambitious rendezvous mission with another comet (P/Wirtanen). This mission, named ROSETTA, will go on from 2003 to 2013, ending after the comet perihelion phase and including also the fly-by with two asteroids of the main belt (140 Siwa and 4979 Otawara). Scientific priority of the mission is the in situ investigation of the cometary nucleus, with the aim of better understanding the formation and the composition of planetesimals and their evolution over the last 4.5 billions of years. In this context, the Authors were involved in the design of the baffling for the Wide Angle Camera (WAC) of the imaging system (OSIRIS) carried on board of the spacecraft. Scientific requirements for the WAC are : a large field of view (FOV) of 12° x 12° with a resolution of 100 (mu) rad per pixel, UV response, and a contrast ratio of 10-4 in order to detect gaseous and dusty features close to the nucleus of the comet. TO achieve these performances, a fairly novel class of optical solutions employing off-axis sections of concentric mirrors was explored. Regarding baffling, the peculiar demand was the rejection of stray-light generated by the optics for sources within the FOV, since the optical entrance aperture is located at the level of the secondary mirror (instead of the primary as usual). This paper describes the baffle design and analyzes its performances, calculated by numerical simulation with ray tracing methods, at different angles of incidence of the light, for sources both outside and inside the field of view.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pierfrancesco Brunello, Pierfrancesco Brunello, Fabio Peron, Fabio Peron, Cesare Barbieri, Cesare Barbieri, Sonia Fornasier, Sonia Fornasier, } "Baffling system for the Wide Angle Camera (WAC) of ROSETTA mission", Proc. SPIE 4093, Current Developments in Lens Design and Optical Systems Engineering, (24 October 2000); doi: 10.1117/12.405246; https://doi.org/10.1117/12.405246
PROCEEDINGS
10 PAGES


SHARE
RELATED CONTENT

Notch and large-area CCD imagers
Proceedings of SPIE (June 30 1991)
The CONTOUR remote imager and spectrometer (CRISP)
Proceedings of SPIE (February 09 2004)
The Keck Cosmic Web Imager a capable new integral...
Proceedings of SPIE (September 23 2012)
Increasing the productivity of the WHT
Proceedings of SPIE (July 24 2000)
Initial results from VIRUS production spectrographs
Proceedings of SPIE (September 23 2012)

Back to Top