In the next six months the team will wrestle with the details of launching such a mission, including its cost-effectiveness and the areas in which Indian scientists can significantly add to the mountain of knowledge that has already been collected about the moon. It will form the basis of a project report that ISRO will submit to the Central Government for approval. The objective: to have an Indian lunar mission sent up by  October 2008. “As a motivator, it will electrify the nation,” Kasturirangan explained  last week. “If we go ahead, it will demonstrate to the world that India is capable of taking up a complex mission that is at the cutting edge of space. The spins-offs for us are going to be many.”first planetary mission, Chandrayaan-1, has now been rescheduled to take place in the first week of July as the mission personnel work overtime to sort out payload integration and launch-related issues. “We are targeting the end of June. We will try to make it in the first week of July,” a senior scientist associated with the Rs 386 crore moon mission told here on Monday on condition of anonymity.
The lunar mission was originally scheduled for April this year, a time-frame targeted four years ago to get all the payloads well ahead of time and to galvanise the scientists into mission mode with a target to work on.

Indian Space Research Organisation officials insisted that there are no hardware problems and that the space agency is moving more cautiously to ensure that all systems are well tested before and after integration at each stage.

The 525-kg lunar orbiter will carry as many as 11 instruments (payloads), including six from overseas — two from the US and one each from Britain, Sweden, Germany and Bulgaria.

“Normally we have 2-3 instruments (on board satellite). For the first time, we have 11 instruments from different institutions. We have to ensure that the integration work takes place to our satisfaction
Project Director of Chandrayaan-1.

Stressing on inter-compatibility of various instruments on board, Annadurai said ISRO is working on ensuring that “all the systems (one system) does not disturb other systems’ performance”. “Any system of this volume will have its own issues that need to be solved before proceeding to the next step,” he said.

“The issue gets compounded as the organisations are many. When we do this, it will add to taking away schedule cushions. Just to keep the launch target, we don’t want to overlook any issue that will compromise the unqualified success of the mission”.

ISRO had earlier proposed to launch the lunar probe on April 9 and if not on that day, then on April 23.

“If systems (once integrated and with propellants loaded) are kept for 14 days, then there could be some deterioration”, he said, adding, ISRO is now working on a strategy that would allow it to have more number of launch opportunities. “We have almost arrived at a strategy”.

ISRO would keep a half-an-hour launch window on a given day, and if it is not in a position for the mission during that period, it could be done in the subsequent two days as well, Annadurai explained.While the spacecraft itself will not land on the Moon, it will act as an orbiter and land a rover on the surface. The spacecraft is being launched next month sometime between October 22 and October 26 2008. The spacecraft payload includes 11 payloads (including one from NASA) and will perform remote sensing and studies of the lunar surface. The mission is estimated to cost Rs 386 crore (~ 84.3 million USD).”

The Working Model of Chandrayaan-1

Chandrayaan-1

How it Works?

The primary objectives of the Chandrayaan-1 mission are simultaneous chemical, mineralogicaland topographic mapping of the lunar surface at high spatial resolution. These data should enableus to understand compositional variation of major elements, which in turn, should lead to a betterunderstanding of the stratigraphic relationships between various litho units occurring on the lunarsurface. The major element distribution will be determined using an X-ray fluorescence spectro-meter (LEX), sensitive in the energy range of 1–10 keV where Mg, Al, Si, Ca and Fe give their Kαlines. A solar X-ray monitor (SXM) to measure the energy spectrum of solar X-rays, which areresponsible for the fluorescent X-rays, is included. Radioactive elements like Th will be measured byits 238.6 keV line using a low energy gamma-ray spectrometer (HEX) operating in the 20–250 keVregion. 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 nmwhere 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 withESA. A terrain mapping camera (TMC) in the panchromatic band will provide a three-dimensionalmap of the lunar surface with a spatial resolution of about 5m. 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 10m.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 scientificpayloads, certain technology experiments have been proposed, which may include an impactorwhich will be released to land on the Moon during the mission.Salient features of the mission are described here. The ensemble of instruments onboardChandrayaan-1 should enable us to accomplish the science goals defined for this mission.Chandrayaan-1 is a remote sensing mission pro-posed to be launched from the Satish DhawanLaunch Station at Sriharikota in 2007 by theIndian Space Research Organization using thePolar Satellite Launch Vehicle. It will be injectedinto 240×36,000 km Elliptic Transfer Orbit (ETO)around the Earth and will be inserted in a circum-lunar orbit (LOI) via Lunar Transfer Trajectory(LTT). The launch profile is discussed in detail inan accompanying paper (Adimurthy et al 2005). Itwill enter the lunar orbit at about 1000 km altitudeand brought down to 100 km polar circular orbitin one or two stages. The lunar craft is designedto orbit the moon for a period of two years duringwhich it will carry out chemical, mineralogical andtopographic study of the lunar surface.There are several questions which are critical forunderstanding the formation and early evolution-ary history of the Moon, and the Chandrayaan-1mission objectives have been formulated keepingthis in mind.The main objective of the mission is simultane-ous chemical, mineral and topographic mappingwith the specific goal of understanding the earlyevolution of the Moon. Chemical stratigraphy canprovide better estimation of the average lunar com-position and processes responsible for chemical dif-ferentiation of the Moon. Transport of volatiles,specifically water, and their deposition in thecolder regions of the Moon and degassing of theMoon can be understood by using radon and itsdaughter nuclide210Pb as tracers.

When
Chandrayaan-1 planned to be launched in 2008 using spacecraft and launch vehicle of ISRO. The mission is expected to have an operational life of about 2 years.

The idea of undertaking an Indian scientific mission to Moon was initially mooted in a meeting of the Indian Academy of Sciences in 1999 that was followed up by discussions in the Astronautical Society of India in 2000. Based on the recommendations made by the learned members of these forums, a National Lunar Mission Task Force was constituted by the Indian Space Research Organisation (ISRO). Leading Indian scientists and technologists participated in the deliberations of the Task Force that provided an assessment on the feasibility of an Indian Mission to the Moon as well as dwelt on the focus of such a mission and its possible configuration.

Government of India approved ISRO’s proposal for Chandrayaan-1 in November 2003.

Chandrayaan will be ready to launch in between October 19 and October 28.

chandrayaan 1 is now in lunar orbit. the scientific objective of the mission is

The Chandrayaan-1 mission is aimed at high-resolution remote sensing of the moon in visible, near infrared (NIR), low energy X-rays and high-energy X-ray regions. Specifically the objectives are

To prepare a three-dimensional atlas (with high spatial and altitude resolution of 5-10 m) of both near and far side of the moon.     To conduct chemical and mineralogical mapping of the entire lunar surface for distribution of mineral and chemical elements such as Magnesium, Aluminum, Silicon, Calcium, Iron and Titanium as well as high atomic number elements such as Radon, Uranium & Thorium with high spatial resolution.

The Simultaneous photo geological, mineralogical and chemical mapping through Chandrayaan-1 mission will enable identification of different geological units to infer the early evolutionary history of the Moon. The chemical mapping will enable to determine the stratigraphy and nature of the Moon’s crust and thereby test certain aspects of magma ocean hypothesis. This may allow to determine the compositions of impactors that bombarded the Moon during its early evolution which is also relevant to the formation of the Earth.     Scientific Objectives   The Chandrayaan-1 mission is aimed at high-resolution remote sensing of the moon in visible, near infrared (NIR), low energy X-rays and high-energy X-ray regions. Specifically the objectives are   To prepare a three-dimensional atlas (with high spatial and altitude resolution of 5-10 m) of both near and far side of the moon.     To conduct chemical and mineralogical mapping of the entire lunar surface for distribution of mineral and chemical elements such as Magnesium, Aluminum, Silicon, Calcium, Iron and Titanium as well as high atomic number elements such as Radon, Uranium & Thorium with high spatial resolution.     The Simultaneous photo geological, mineralogical and chemical mapping through Chandrayaan-1 mission will enable identification of different geological units to infer the early evolutionary history of the Moon. The chemical mapping will enable to determine the stratigraphy and nature of the Moon’s crust and thereby test certain aspects of magma ocean hypothesis. This may allow to determine the compositions of impactors that bombarded the Moon during its early evolution which is also relevant to the formation of the Earth.   Click here to enlarge Radiation Environment of the Moon   Radiation environment of the Moon produced by solar radiation and solar and galactic cosmic rays: The reflectance spectrum is useful for mineral identification, the fluorescent X-ray spectrum and solar and galactic cosmic-ray produced gamma radiation for chemical mapping, and radiogenic gamma and alpha particle spectrum for mapping of radioactive nuclides (U, Th, K, etc.) and in understanding the leakage of radon from the lunar interior and its transport on the lunar surface. The uranium decay chain, which produces 222Rn and its daughters, forming a thin ‘paint’ on the lunar surface, are shown on the right. The temperature regimes on the sunlit and night side of the Moon and the permanently shadowed cold Polar Regions are shown schematically Mission Objectives   To realise the mission goal of harnessing the science payloads, lunar craft and the launch vehicle with suitable ground support systems including Deep Space Network (DSN) station.     To realise the integration and testing, launching and achieving lunar polar orbit of about 100 km, in-orbit operation of experiments, communication/ telecommand, telemetry data reception, quick look data and archival for scientific utilisation by scientists.

by Gyandotcom

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