Advanced Technologies Demonstrated by the Miniature Integrated Camera and Spectrometer (MICAS) Aboard Deep Space 1

Rodgers, David H.; Beauchamp, P.; Soderblom, Laurence A.; Brown, R. H.; Chen, Gun Shing; Lee, Meemong; Sandel, B. R.; Thomas, David A.; Benoit, Robert; Yelle, R. V.

doi:10.1007/s11214-007-9155-9

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…Comet 19P/Borrelly's nucleus surface has been investigated by means of the Miniature Integrated Camera and Spectrometer (MICAS, Rodgers et al (2007)), that provided both VIS broadband images and IR (1.3-2.6 µm) spectral-spatial images. In particular, these latter evidenced a linear red-sloped IR spectrum, possibly exhibiting some variability between the large and small ends of the nucleus.…”

Section: Uv-vis-ir Spectral Properties From Optical Remote Sensingmentioning

confidence: 99%

Comet nuclei composition and evolution

Filacchione¹,

Ciarniello²,

Fornasier³

et al. 2022

Preprint

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Thanks to Rosetta orbiter's and Philae lander's data our knowledge of cometary nuclei composition has experienced a great advancement. The properties of 67P/Churyumov-Gerasimenko nucleus are discussed and compared with other comets explored in the past by space missions. Cometary nuclei are made by a collection of ices, minerals, organic matter, and salts resulting in very dark and red-colored surfaces. When relatively far from the Sun (> 3AU), exposed water and carbon dioxide ices are found only in few locations of 67P/CG where the exposure of pristine subsurface layers or the recondensation of volatile species driven by the solar heating and local terrain morphology can sustain their temporary presence on the surface. The nucleus surface appears covered by a dust layer of variable thickness caused by the back-fall flux of coma grains. Depending on local morphology, some regions are less influenced by the back-fall and show consolidated terrains. Dust grains appear mostly dehydrated and are made by an assemblage of minerals, organic matter, and salts mixed together. Spectral analysis shows that the mineral phase is dominated by silicates and fine-grained opaques (possibly including Fe-sulfides such as troilite or pyrrhotite), and ammoniated salts. Aliphatic and aromatic groups, with the presence of the strong hydroxyl group, are identified within the organic matter. The surface composition and physical properties of cometary nuclei evolve with heliocentric distance and seasonal cycling: approaching perihelion the increase of the solar flux boost the activity through the sublimation of volatile species which in turn causes the erosion of surface layers, the exposure of ices, the activity in cliffs and pits, the collapse of overhangs and walls, and the mobilization and redistribution of dust. The evolution of color, composition, and texture changes occurring across different morphological and geographical regions of the nucleus are correlated with these processes. In this chapter we discuss 67P/CG nucleus composition and evolutionary processes as observed by Rosetta mission in the context of other comets previously explored by space missions or observed from Earth.

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Section: Uv-vis-ir Spectral Properties From Optical Remote Sensingmentioning

confidence: 99%

Comet nuclei composition and evolution

Filacchione¹,

Ciarniello²,

Fornasier³

et al. 2022

Preprint

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Small Satellite Electro-Optical System (EOS) Technological and Commercial Expansion

Gadisa,

Bang

2023

Acta Astronautica

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Triple layer heterojunction Ga2O3/NiO/SiC for ultrafast, high-response ultraviolet image sensing

Liu

Zhu

Zhang

et al. 2022

Applied Physics Letters

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Ultraviolet (UV) image sensing is of considerable scientific and engineering interest due to its unique advantages of visible blindness and irradiation resistance. However, slow response speed and poor responsivity still restrict the large-scale application of this sensing technique. Herein, a photovoltaic-type UV image sensor based on the lateral photovoltaic effect (LPE) has been designed using a triple layer Ga2O3/NiO/SiC heterojunction. The device demonstrates an unprecedented position sensitivity (750.86 mV/mm), a large voltage on/off ratio (Vlight/Vdark > 102), and an ultrafast response speed (0.59 μs) under UV irradiation. Thanks to its outstanding LPE characteristics, the appliance also exhibits an impressive performance in UV image sensing, even in environment reliability testing. Given these remarkable features of the sensor, this work not only proposes a strategy to improve the performance of UV detectors, but also provides a practical solution for UV image sensing applications.

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Advanced Technologies Demonstrated by the Miniature Integrated Camera and Spectrometer (MICAS) Aboard Deep Space 1

Cited by 3 publications

References 14 publications

Comet nuclei composition and evolution

Comet nuclei composition and evolution

Small Satellite Electro-Optical System (EOS) Technological and Commercial Expansion

Triple layer heterojunction Ga2O3/NiO/SiC for ultrafast, high-response ultraviolet image sensing

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