An efficient momentum dumping method for near equatorial orbit satellites

Precession of an equatorial orbit

Motions of Celestial Bodies ◽

10.1088/bk978-0-750-31100-7ch6 ◽

2014 ◽

Author(s):

Eugene Butikov

Keyword(s):

Equatorial Orbit

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The Double Star mission

Annales Geophysicae ◽

10.5194/angeo-23-2707-2005 ◽

2005 ◽

Vol 23 (8) ◽

pp. 2707-2712 ◽

Cited By ~ 68

Author(s):

Z. X. Liu ◽

C. P Escoubet ◽

Z. Pu ◽

H. Laakso ◽

J. K. Shi ◽

...

Keyword(s):

Space Science ◽

Double Star ◽

The Other ◽

Polar Orbit ◽

Equatorial Orbit ◽

Ground Station ◽

Ground Segment ◽

The Earth ◽

Science Operations

Abstract. The Double Star Programme (DSP) was first proposed by China in March, 1997 at the Fragrant Hill Workshop on Space Science, Beijing, organized by the Chinese Academy of Science. It is the first mission in collaboration between China and ESA. The mission is made of two spacecraft to investigate the magnetospheric global processes and their response to the interplanetary disturbances in conjunction with the Cluster mission. The first spacecraft, TC-1 (Tan Ce means "Explorer"), was launched on 29 December 2003, and the second one, TC-2, on 25 July 2004 on board two Chinese Long March 2C rockets. TC-1 was injected in an equatorial orbit of 570x79000 km altitude with a 28° inclination and TC-2 in a polar orbit of 560x38000 km altitude. The orbits have been designed to complement the Cluster mission by maximizing the time when both Cluster and Double Star are in the same scientific regions. The two missions allow simultaneous observations of the Earth magnetosphere from six points in space. To facilitate the comparison of data, half of the Double Star payload is made of spare or duplicates of the Cluster instruments; the other half is made of Chinese instruments. The science operations are coordinated by the Chinese DSP Scientific Operations Centre (DSOC) in Beijing and the European Payload Operations Service (EPOS) at RAL, UK. The spacecraft and ground segment operations are performed by the DSP Operations and Management Centre (DOMC) and DSOC in China, using three ground station, in Beijing, Shanghai and Villafranca.

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The Canis Major Dwarf Galaxy

Publications of the Astronomical Society of Australia ◽

10.1071/as04053 ◽

2004 ◽

Vol 21 (4) ◽

pp. 371-374

Author(s):

Geraint F. Lewis ◽

Rodrigo A. Ibata ◽

Michael J. Irwin ◽

Nicolas F. Martin ◽

Michele Bellazzini ◽

...

Keyword(s):

Building Block ◽

Milky Way ◽

Galactic Halo ◽

Galactic Plane ◽

Dwarf Galaxy ◽

Observational Evidence ◽

Thick Disk ◽

Equatorial Orbit ◽

Satellite Galaxy

AbstractRecent observational evidence suggests that the Sagittarius dwarf galaxy represents the only major ongoing accretion event in the Galactic halo, accounting for the majority of stellar debris identified there. This paper summarises the recent discovery of another potential Milky Way accretion event, the Canis Major dwarf galaxy. This dwarf satellite galaxy is found to lie just below the Galactic plane and appears to be on an equatorial orbit. Unlike Sagittarius, which is contributing to the Galactic halo, the location and eventual demise of Canis Major suggests that it represents a building block of the thick disk.

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