The narrow angle camera of the MPCS suite for the MarcoPolo ESA Mission: requirements and optical design solutions

Vania Da Deppo; Gabriele Cremonese; Giampiero Naletto

doi:10.1117/12.857550

5 August 2010 The narrow angle camera of the MPCS suite for the MarcoPolo ESA Mission: requirements and optical design solutions

Vania Da Deppo, Gabriele Cremonese, Giampiero Naletto

Author Affiliations +

Proceedings Volume 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave; 773119 (2010) https://doi.org/10.1117/12.857550
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Possible optical designs of a Narrow Angle Camera (NAC) suitable for being the high resolution channel of the MarcoPolo Camera System for the MarcoPolo ESA mission are presented. The MarcoPolo mission objective is the rendezvous with a Near Earth Asteroid in order to fully characterize the body, to land on the surface and to return to Earth a sample of the asteroid soil. Science goals for the NAC are global mapping of the object, detailed investigations of the surface at high spatial resolution (order of millimeters), and deep examination of possible landing sites from a close distance. The instrument has a 3"/pixel scale factor, corresponding to 80 mm/px at 5 km from the surface, on a 1.75° × 1.75° FoV; imaging in 5 to 8 different spectral bands (panchromatic and broadband), in the range between 400 and 900 nm, is foreseen. Since the target is an extended low contrast object, to avoid image contrast degradation, only off-axis unobstructed optical layouts have been considered. Solutions with two mirrors plus a refractive corrector, or all-reflective three mirrors ones, have been studied, both allowing to reach good aberration balancing over all the field of view: the diffraction Ensquared Energy inside one pixel of the detector is of the order of 70%. To cope with the hazardous radiation environment in which the spacecraft will be immersed in during the mission, all the glasses selected for the design are rad-hard type.

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Vania Da Deppo, Gabriele Cremonese, and Giampiero Naletto "The narrow angle camera of the MPCS suite for the MarcoPolo ESA Mission: requirements and optical design solutions", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773119 (5 August 2010); https://doi.org/10.1117/12.857550

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KEYWORDS

Cameras

Mirrors

Asteroids

Sensors

Optical design

Off axis mirrors

Modulation transfer functions

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