TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 60 (No. 4), pp. 417-424, 2008

Estimation of the lunar reflectance by ground-based observation using a tunable liquid-crystal filter telescope

Kazuto Saiki1, Kimiko Saito1, Hideaki Okuno1, Akiko Suzuki1, Yuta Yamanoi1, Naru Hirata2, and Ryosuke Nakamura3

1Department of Earth and Space Science, Osaka University, Toyonaka City, Osaka, Japan
2Department of Computer Software, The University of Aizu, Aizu-Wakamatsu City, Fukushima, Japan
3Grid Technology Research Center, Advanced Industrial Science and Technology (AIST), Tsukuba, Japan

(Received April 24, 2007; Revised November 20, 2007; Accepted December 11, 2007; Online published April 9, 2008)

Abstract: Lunar reflectance data are useful not only for lithological identification of the lunar surface but also for radiometric calibration and determination of exposure time for optical sensors of lunar probes. To gain data on lunar reflectance, we acquired multi-band images (five bands: 650, 750, 900, 950, and 1000 nm) of the lunar surface and those of some standard stars using a liquid-crystal tunable filter (LCTF) telescope located on the peak of Mt. Haleakala (Hawaii, USA). The data obtained indicate that the reflectance data of Clementine UV/VIS is too high and that the correction factor is 0.59±0.06 at 950 nm. Our new reflectance data are available to the public at the web site of one of authors (K.S.). We report here our method of deriving the lunar reflectance images from the ground-based observation with a hyperspectral telescope for the users of our reflectance data. The results suggest that ground-based observation is more suitable for the radiometric calibration of the sensor of a lunar probe than laboratory data.
Key words: Clementine, the Moon, hyper-spectral telescope, reflectance, SELENE.

Corresponding author E-mail: ksaiki@ess.sci.osaka-u.ac.jp

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