Ghost analysis of the EnVisS camera for the Comet Interceptor ESA mission

Simone Nordera; Vania Da Deppo; Paola Zuppella; Paolo Chioetto; Vincenzo Della Corte; Claudio Pernechele; Umberto Barozzi; Riccardo Gabrieli; Giuseppe Impiccichè; Demetrio Labate; Beatrice Tofani; Leonardo Tommasi

doi:10.1117/12.2629473

27 August 2022 Ghost analysis of the EnVisS camera for the Comet Interceptor ESA mission

Simone Nordera, Vania Da Deppo, Paola Zuppella, Paolo Chioetto, Vincenzo Della Corte, Claudio Pernechele, Umberto Barozzi, Riccardo Gabrieli, Giuseppe Impiccichè, Demetrio Labate, Beatrice Tofani, Leonardo Tommasi

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218036 (2022) https://doi.org/10.1117/12.2629473
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

EnVisS (Entire Visible Sky) is a space camera aboard the Comet Interceptor ESA mission. This is the first F-class space mission, a new generation of fast ESA missions, and it is scheduled for launch in 2029. Comet Interceptor aims to study, by means of in situ observations, a dynamically new comet, or interstellar object, that enters the Solar System for the first time. Approaching the comet, three modules will detach: spacecraft A will provide remote sensing and communications, while spacecraft B1 and B2 will cross the coma and fly-by the nucleus. EnVisS is a fish-eye camera with a field of view (FOV) of 180° × 45°. It is mounted on B2, which is spin stabilized; the spin provides the scanning motion for the camera allowing imaging the whole sky (180° × 360°) including the comet. The EnVisS optical head is composed of ten lenses; the collected visible light passes through a three-strip filter assembly before reaching the detector. The central filter strip is a broadband filter, while the sides filter strips are linear polarizers, with the aim of studying the polarization state of the light reflected by both the comet coma and its core. The optical performance of EnVisS has been evaluated through ray tracing analyses. In this paper, the ghost study will be described and ghost images will be shown. This analysis, performed in the ZEMAX OpticStudio®, highlights which optical element causes the most intense ghost images and shows their distribution over the detector.

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Simone Nordera, Vania Da Deppo, Paola Zuppella, Paolo Chioetto, Vincenzo Della Corte, Claudio Pernechele, Umberto Barozzi, Riccardo Gabrieli, Giuseppe Impiccichè, Demetrio Labate, Beatrice Tofani, and Leonardo Tommasi "Ghost analysis of the EnVisS camera for the Comet Interceptor ESA mission", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218036 (27 August 2022); https://doi.org/10.1117/12.2629473

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