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METIS: the visible and UV coronagraph for solar orbiter

Authors :: Stefano Pucci
Marco Malvezzi
Vincenzo Andretta
A. Berlicki
Silvano Fineschi
Daniele Telloni
Ester Antonucci
John D. Moses
Federico Landini
M. G. Pelizzo
Giuseppe Massone
S. Vives
Cristian Baccani
F. Frassetto
Mauro Focardi
Michela Uslenghi
Gianalfredo Nicolini
V. Da Deppo
Enrico Magli
Alessandro Bemporad
Luca Teriaca
Giampiero Naletto
Lucia Abbo
Marco Romoli
Maurizio Pancrazzi
Daniele Spadaro
Gerardo Capobianco
Piergiorgio Nicolosi
Luca Poletto
Source :: International Conference on Space Optics--ICSO 2014, Tenerife, Canary Islands, Spain, 7-10/10/2014, info:cnr-pdr/source/autori:Romoli, M.; Landini, F.; Antonucci, E.; Andretta, V.; Berlicki, A.; Fineschi, S.; Moses, J. D.; Naletto, G.; Nicolosi, P.; Nicolini, G.; Spadaro, D.; Teriaca, L.; Baccani, C.; Focardi, M.; Pancrazzi, M.; Pucci, S.; Abbo, L.; Bemporad, A.; Capobianco, G.; Massone, G.; Telloni, D.; Magli, E.; Da Deppo, V.; Frassetto, F.; Pelizzo, M. G.; Poletto, L.; Uslenghi, M.; Vives, S.; Malvezzi, M./congresso_nome:International Conference on Space Optics--ICSO 2014/congresso_luogo:Tenerife, Canary Islands, Spain/congresso_data:7-10%2F10%2F2014/anno:2017/pagina_da:/pagina_a:/intervallo_pagine, International Conference On Space Optics, ICSO 2014, Tenerife, Spain, 7-10 ottobre 2014, info:cnr-pdr/source/autori:M. Romoli, F. Landini, E. Antonucci, V. Andretta, A. Berlickii, S. Fineschi, J. D Moses, G. Naletto, P. Nicolosi, G. Nicolini, D. Spadaro, L. Teriaca, C. Baccani, M. Focardi, M. Pancrazzi, S. Pucci, L. Abbo, A. Bemporad, G. Capobianco, G. Massone, D. Telloni, E. Magli, V. Da Deppo, F. Frassetto, M.-G. Pelizzo, L. Poletto, M. Uslenghi, S. Vives, M. Malvezzi/congresso_nome:International Conference On Space Optics, ICSO 2014/congresso_luogo:Tenerife, Spain/congresso_data:7-10 ottobre 2014/anno:2014/pagina_da:/pagina_a:/intervallo_pagine
Publication Year :: 2017
Publisher :: SPIE, 2017.
Abstract: METIS coronagraph is designed to observe the solar corona with an annular field of view from 1.5 to 2.9 degrees in the visible broadband (580-640 nm) and in the UV HI Lyman-alpha, during the Sun close approaching and high latitude tilting orbit of Solar Orbiter. The big challenge for a coronagraph is the stray light rejection. In this paper after a description of the present METIS optical design, the stray light rejection design is presented in detail together with METIS off-pointing strategies throughout the mission. Data shown in this paper derive from the optimization of the optical design performed with Zemax ray tracing and from laboratory breadboards of the occultation system and of the polarimeter.