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Unambiguous detection of OH and H2O on the Moon from Chandrayaan-2 Imaging Infrared Spectrometer reflectance data using 3 μm hydration feature


Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, India
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, India
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, India
 

Imaging Infrared Spectrometer (IIRS) on-board Chandrayaan-2 is designed to measure lunar reflected and emitted solar radiation in 0.8–5.0 μmm spectral range. Its high spatial resolution (~80 m) and extended spectral range is most suitable to completely characterize lunar hydration (2.8–3.5 μmm region) attributed to the presence of OH and/or H2O. Here we present initial results from IIRS reflectance data analysed to unambiguously detect and quantify lunar 3 μmm absorption feature. After pre-processing and data-reduction, a physics based thermal correction analysis of IIRS reflectance spectra has been done using co-located temperature measurements. Hydration absorption was observed at all latitudes and surface types with varying degrees for all pixels in the study area and its absorption depth shows distinct variability associated with mineralogy, surface temperature and latitude.

Keywords

Imaging Infrared Spectrometer, Lunar Hydration, Moon, Reflectance Data, Thermal Correction.
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  • Unambiguous detection of OH and H2O on the Moon from Chandrayaan-2 Imaging Infrared Spectrometer reflectance data using 3 μm hydration feature

Abstract Views: 448  |  PDF Views: 146

Authors

Prakash Chauhan
Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, India
Mamta Chauhan
Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, India
Prabhakar A. Verma
Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, India
Supriya Sharma
Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, India
Satadru Bhattacharya
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India
Aditya Kumar Dagar
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
Amitabh
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
Abhishek N. Patil
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
Ajay Kumar Parashar
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
Ankush Kumar
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
Nilesh Desai
Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, India
Ritu Karidhal
U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, India
A. S. Kiran Kumar
Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, India

Abstract


Imaging Infrared Spectrometer (IIRS) on-board Chandrayaan-2 is designed to measure lunar reflected and emitted solar radiation in 0.8–5.0 μmm spectral range. Its high spatial resolution (~80 m) and extended spectral range is most suitable to completely characterize lunar hydration (2.8–3.5 μmm region) attributed to the presence of OH and/or H2O. Here we present initial results from IIRS reflectance data analysed to unambiguously detect and quantify lunar 3 μmm absorption feature. After pre-processing and data-reduction, a physics based thermal correction analysis of IIRS reflectance spectra has been done using co-located temperature measurements. Hydration absorption was observed at all latitudes and surface types with varying degrees for all pixels in the study area and its absorption depth shows distinct variability associated with mineralogy, surface temperature and latitude.

Keywords


Imaging Infrared Spectrometer, Lunar Hydration, Moon, Reflectance Data, Thermal Correction.

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DOI: https://doi.org/10.18520/cs%2Fv121%2Fi3%2F391-401