Lunar project ILOM:application of the analytical theory of Lunar physical libration for the simulation of star observations  

作　　者：PETROVA Nataliya GUSEV Alexander PING JinSong IVANOVA Tamara HANADA Hideo KAWANO Nobuyuki SU XiaoLi 

机构地区：[1]Department of Astronomy,Kazan State University,Kazan 420008,Russia [2]Department of Computer Sciences,Kazan State Power Engineering University,Kazan 420008,Russia [3]National Astronomical Observatory,Chinese Academy of Sciences,Beijing 100020,China [4]Institute of Applied Astronomy,Sankt-Petersburg 195251,Russia [5]National Astronomical Observatory of Japan,NICT,Mizusawa 023-0861,Japan [6]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第5期888-891,共4页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Russian-Japanese Grant RFFI-JSPS 09-02-92113-ЯΦ_a (2009-2010);the National Natural Science Foundation of China (Grant Nos.11010144 and 10973031);the Chinese National High-Tech Projects (Grant No.2010AA122206)

摘　　要：This study briefly describes the targets and problems of the future Japanese project In situ Lunar Orientation Measurement(ILOM),which is planned for the year 2017.One of the important parts of the project is to place a small optical telescope on the Lunar surface with the purpose to detect the Lunar physical libration with unprecedented accuracy 0.001 arcsec.At the present stage of research the computer simulation of future observations is going on,aiming to determine the moments of transition of a star through the first meridian and the polar distance of the star.Rotation of the Moon is being calculated under the analytical theory developed in the frame of a theme of the grant.A list of stars brighter than 12 m,whose coordinates are close to the Lunar precession pole motion,was constructed on the basis of several star catalogues.On average,for each moment of observation in the field of view of the telescope(1°) there are approximately 20-25 stars.Analyses of simulated stellar tracks observable from the Lunar surface(in a polar zone) reveal the significant difference from daily parallels of stars in comparison with the Earth.During one Lunar "day" equal 237 terrestrial days,a star moves on a spiral.However,depending on a longitude of a star,these spirals can be untwisted or twisted.In the latter case a star can describe a loop in the sky of the Moon during the period of supervision.Such an unusual astrometric phenomenon combined with the slow rotation of the Moon is compared with the Earth and the fast precession motion of the Lunar pole(in comparison with the precession motion of a terrestrial pole).This study briefly describes the targets and problems of the future Japanese project In situ Lunar Orientation Measurement （ILOM）, which is planned for the year 2017. One of the important parts of the project is to place a small optical telescope on the Lunar surface with the purpose to detect the Lunar physical libration with unprecedented accuracy 0.001 arcsec. At the present stage of research the computer simulation of future observations is going on, aiming to determine the moments of transition of a star through the first meridian and the polar distance of the star. Rotation of the Moon is being calculated under the analytical theory developed in the frame of a theme of the grant. A list of stars brighter than 12 m, whose coordinates are close to the Lunar precession pole motion, was constructed on the basis of several star catalogues. On average, for each mo- ment of observation in the field of view of the telescope （1~） there are approximately 20-25 stars. Analyses of simulated stellar tracks observable from the Lunar surface （in a polar zone） reveal the significant difference from daily parallels of stars in comparison with the Earth. During one Lunar ＂day＂ equal 237 terrestrial days, a star moves on a spiral. However, depend- ing on a longitude of a star, these spirals can be untwisted or twisted. In the latter case a star can describe a loop in the sky of the Moon during the period of supervision. Such an unusual astrometric phenomenon combined with the slow rotation of the Moon is compared with the Earth and the fast precession motion of the Lunar pole （in comparison with the precession motion of a terrestrial pole）.

关 键 词：ILOM LUNAR physical libration TELESCOPE 

分 类 号：P184.5[天文地球—天文学] TP391.9[自动化与计算机技术—计算机应用技术]