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Surface mineralogy and stratigraphy of the lunar South Pole-Aitken basin determined from Clementine UV/VIS and NIR data
Davies, G. R.; Foing, B. H.; Borst, A. M. +1 more
The South Pole-Aitken (SPA) basin, located on the lunar far side, is one of the oldest and largest recognised impact structures in the solar system. The basin is a proposed site for future sample return missions and human bases due to the unique geological environment and its potential for preservation of water ice in areas of near-permanent shado…
Study on Stationkeeping for Halo Orbits at EL1: Dynamics Modeling and Controller Designing
Xu, Ming; Xu, Shijie
This paper deals with the stationkeeping control for halo orbits at EL1 in the Sun-Earth/Moon system, and proposes an effective adaptive robust controller for the unknown spacecraft mass and perturbation boundaries. The controller has to deal with two divergence sources: one is the instability of the halo orbit, and the other is the per…
Application of electrical propulsion for an active debris removal system: a system engineering approach
Covello, Fabio
One of the main challenge in the design of an active removal system for space debris is the high ΔV required both to approach space debris lying in different orbits and to de-orbit/re-orbit them. Indeed if the system does not target a number of objects during its lifetime the cost of the removal will be far too high to be considered as the basis o…
The effect of protons on the performance of second generation Swept Charge Devices
Gow, Jason P. D.; Holland, Andrew D.; Pool, Peter J. +1 more
The e2v technologies Swept Charge Device (SCD) was developed as a large area detector for X-ray Fluorescence (XRF) analysis, achieving near Fano-limited spectroscopy at -15 °C. The SCD was flown in the XRF instruments onboard the European Space Agency's SMART-1 and the Indian Space Research Organisation's Chandrayaan-1 lunar missions. The second g…
Simulated performance of a single pixel PIN spectrometer SCXM equipped with a concentrator optics in Solar coronal X-ray observations
Alha, L.; Huovelin, J.; Nevalainen, J.
In this paper we present simulated solar coronal X-ray observations to verify the sensitivity of a new hypothetical instrument design. These simulations are folded through this X-ray spectrometer having a moderate size circular field of view (FoV) of 1.6°. This SCXM (Solar Coronal X-ray Mapper) is designed to compose of a single pixel silicon PIN …
The use of swept-charge devices in planetary analogue X-ray fluorescence studies
Smith, D. R.; Walker, T. E.
The Chandrayaan-1 X-ray Spectrometer (C1XS) was launched onboard the Indian Space Research Organisation (ISRO) Chandrayaan-1 lunar mission in October 2008. The instrument consisted of 24 swept-charge device (SCD) silicon X-ray detectors providing a total collecting area of ~ 24 cm2, corresponding to a 14° field of view (FWHM), with the …