ASTROD and ASTROD I - Overview and progress

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 近地天体探测和太阳系天体研究团组

	ASTROD and ASTROD I - Overview and progress
	Ni, Wei-Tou 1,2
刊名	INTERNATIONAL JOURNAL OF MODERN PHYSICS D
	2008-07-01
卷号	17 期号:7 页码:921-940
关键词	ASTROD ASTROD I test of relativistic gravity fundamental physics mission gravitational wave detection solar astrodynamics
ISSN号	0218-2718
英文摘要	In this paper, we present an overview of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I mission concepts and studies. The missions employ deep-space laser ranging using drag-free spacecraft to map the gravitational field in the solar-system. The solar-system gravitational field is determined by three factors: the dynamic distribution of matter in the solar system; the dynamic distribution of matter outside the solar system (galactic, cosmological, etc.) and gravitational waves propagating through the solar system. Different relativistic theories of gravity make different predictions of the solar-system gravitational. eld. Hence, precise measurements of the solar-system gravitational. eld test these relativistic theories, in addition to gravitational wave observations, determination of the matter distribution in the solar-system and determination of the observable (testable) influence of our galaxy and cosmos. The tests and observations include: (i) a precise determination of the relativistic parameters beta and gamma with 3-5 orders of magnitude improvement over previous measurements; (ii) a 1 -2 order of magnitude improvement in the measurement of G; (iii) a precise determination of any anomalous, constant acceleration A(a) directed towards the Sun; (iv) a measurement of solar angular momentum via the Lense-Thirring effect; (v) the detection of solar g-mode oscillations via their changing gravity. eld, thus, providing a new eye to see inside the Sun; (vi) precise determination of the planetary orbit elements and masses; (vii) better determination of the orbits and masses of major asteroids; (viii) detection and observation of gravitational waves from massive black holes and galactic binary stars in the frequency range 50 mu Hz to 5 mHz; and (ix) exploring background gravitational waves. The baseline scheme of ASTROD is to have two spacecraft in separate solar orbits and one spacecraft near the Earth -Sun L1/L2 point carrying a payload of a proof mass, two telescopes, two 1 -2 W lasers with spares, a clock and a drag-free system ranging coherently among one another using lasers. ASTROD I is a first step towards ASTROD. Its scheme is to have one spacecraft in a Venus-gravity-assisted solar orbit, ranging optically with ground stations with less ambitious, but still significant scientific goals.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LIGHT PHASE-LOCKING ; EQUIVALENCE PRINCIPLE ; RELATIVISTIC GRAVITY ; MISSION CONCEPT ; LISA ; SOLAR ; PHYSICS ; SENSOR ; TESTS
收录类别	ISTP ; SCI
语种	英语
WOS记录号	WOS:000258314200002
公开日期	2011-12-29
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1859]
专题	紫金山天文台_近地天体探测和太阳系天体研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Ctr Gravitat & Cosmol, Nanjing 21008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Ni, Wei-Tou. ASTROD and ASTROD I - Overview and progress[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D,2008,17(7):921-940.
APA	Ni, Wei-Tou.(2008).ASTROD and ASTROD I - Overview and progress.INTERNATIONAL JOURNAL OF MODERN PHYSICS D,17(7),921-940.
MLA	Ni, Wei-Tou."ASTROD and ASTROD I - Overview and progress".INTERNATIONAL JOURNAL OF MODERN PHYSICS D 17.7(2008):921-940.