The primary objectives of the Chandrayaan-1 mission are simultaneous chemical, mineralogical and topographic mapping of the lunar surface at high spatial resolution. These data should enable us to understand compositional variation of major elements, which in turn, should lead to a better understanding of the stratigraphic relationships between various litho units occurring on the lunar surface. The major element distribution will be determined using an X-ray fluorescence spectrometer (LEX), sensitive in the energy range of 1–10 keV where Mg, Al, Si, Ca and Fe give their Kα lines. A solar X-ray monitor (SXM) to measure the energy spectrum of solar X-rays, which are responsible for the fluorescent X-rays, is included. Radioactive elements like Th will be measured by its 238.6 keV line using a low energy gamma-ray spectrometer (HEX) operating in the 20–250 keV region. The mineral composition will be determined by a hyper-spectral imaging spectrometer (HySI) sensitive in the 400–920 nm range. The wavelength range is further extended to 2600 nm where some spectral features of the abundant lunar minerals and water occur, by using a near-infrared spectrometer (SIR-2), similar to that used on the Smart-1 mission, in collaboration with ESA. A terrain mapping camera (TMC) in the panchromatic band will provide a three-dimensional map of the lunar surface with a spatial resolution of about 5 m. Aided by a laser altimeter (LLRI) to determine the altitude of the lunar craft, to correct for spatial coverage by various instruments, TMC should enable us to prepare an elevation map with an accuracy of about 10 m.
Four additional instruments under international collaboration are being considered. These are: a Miniature Imaging Radar Instrument (mini-SAR), Sub Atomic Reflecting Analyser (SARA), the Moon Mineral Mapper (M3) and a Radiation Monitor (RADOM). Apart from these scientific payloads, certain technology experiments have been proposed, which may include an impactor which will be released to land on the Moon during the mission.
Salient features of the mission are described here. The ensemble of instruments onboard Chandrayaan-1 should enable us to accomplish the science goals defined for this mission.
KeywordsChandrayaan-1 surface composition mineralogy imaging payloads radon radioactivity
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- Adimurthy V, Ramanan R V, Tandon S R and Ravikumar C 2005 Launch strategy for Indian Lunar Mission and precision injection to the Moon using Genetic algorithm; This issue.Google Scholar
- Ananth Krishna, Gopinath N S, Hegde N S and Malik N K 2005 Imaging and power generation strategies for Chandrayaan-1; This issue.Google Scholar
- Arnold J R 1979 Ice in the Lunar Polar regions;J. Geophys. Res. 84 5659–5667.Google Scholar
- Bernard L 2000 Radar mapping of Moon shows no evidence of ice (preprint).Google Scholar
- Bhandari N 2002 A quest for the Moon;Curr. Sci. 83 377–393.Google Scholar
- Bhandari N 2004 Scientific challenges of Chandrayaan-1: The Indian Lunar Polar Orbiter Mission;Curr. Sci. 86 1489–1498.Google Scholar
- Bhandari N, Adimurty V, Banerjee D, Srivstava N and Dhingra D 2004a Chandrayaan-1 lunar polar orbiter: Science goals and payloads; Proc. International Lunar Conference 2003 (eds) S M Durst, C T Bohannan, C G Thomason, M R Cerney and L Yuen,Science and Technology Series (American Astronautical Society: USA)108 33–42.Google Scholar
- Bhandari N, Srivastava N and Dhingra D 2004b Udaipur Conference (abstracts) p. 63.Google Scholar
- Bharadwaj A, Barabash S, Futaana Y, Kazama Y, Asamura K, Sridharan R, Holmstrom M, Wurtz P and Lundin R 2005 Low energy neutral atom imaging on the Moon with the SARA instrument aboard Chandrayaan-1 mission; This issue.Google Scholar
- Brodzinski R L and Langford J C 1975 Radon concentra- tions at the Apollo landing sites;Proc. Lunar Sci. Conf. 6th, pp. 3033–3037.Google Scholar
- Cameron A G W and Ward W R 1976 The origin of the Moon (abstract) in Lunar Science VII (Houston: Lunar Planet. Science Institute) pp. 120–122.Google Scholar
- Cameron A G W 1986 The impact theory for Origin of the Moon; In:Origin of the moon (eds) W K Hartmann, R J Phillips and G J Taylor (Houston: Lunar and Plan- etary Institute) pp. 609–616.Google Scholar
- Canup R M and Righter K (eds) 2000 Origin of the Earth and Moon (Tucson: University of Arizona Press) p. 555.Google Scholar
- Crider D H and Vondrak R R 2003 The solar wind as a pos- sible source of lunar polar hydrogen deposits;J. Geophys. Res. 105 26,773–26,782.Google Scholar
- Foing B H with 21 authors 2003 ESA’s SMART-1 Mis- sion launched to the Moon: Technology and Science goals; Proc. International Lunar Conference 2003 (eds) S M Durst, C T Bohannan, C G Thomason, M R Cerney and L Yuen,Science and Technology Series (American Astronautical Society: USA)108 3–14.Google Scholar
- Goswami J N and 11 others 2005 High Energy X-Ä ray Spec- trometer on the Chandrayaan-1 Mission to the Moon; This issue.Google Scholar
- Hartmann W K 1986 Moon Origin: The Impact trigger hypothesis; In:Origin of the moon (eds) W K Hartmann, R J Phillips and G J Taylor (Houston: Lunar and Plan- etary Institute) pp. 579–608.Google Scholar
- Heymann D and Yaniv A 1971 Distribution of Radon-222 on the surface of the Moon;Nature 233 37–39.Google Scholar
- Kamalakar J A, Bhaskar K V S, Laxmi Prasad A S, Ran- jith R, Lohar K A, Venkateswaran R and Alex T K 2005 Lunar ranging instrument for Chandrayaan-1; This issue.Google Scholar
- Keller H W, Mall U and Nathues A 2004 Spectral inves- tigations of the Moon with the Smart-1 near Infrared Spectrometer SIR; Proc. International Lunar Conference 2003 (eds) S M Durst, C T Bohannan, C G Thomason, M R Cerney and L Yuen,Science and Technology Series (American Astronautical Society: USA)108 105–107.Google Scholar
- Kiran Kumar A S and Roy Chowdhury A 2005a Terrain Mapping Camera for Chandrayaan-1; This issue.Google Scholar
- Kiran Kumar A S and Roy Chowdhury A 2005b Hyper- spectral imager in visible and near infrared band for lunar mapping; This issue.Google Scholar
- Shiv Kumar M and Bhandari N 2005 Capture of Interplane- tary bodies in geocentric orbits and early lunar evolution; This issue.Google Scholar