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The International RadioAstron Mission ­ a Earth-Space Interferometer with orbit up to 350 000 km
The RadioAstron Project is designed by the Astro Space Center of the P.N. Lebedev Physical Institute of the Russian Academy of Science, and the S.A. Lavochkin Federal Research & Production Association, Roscosmos in cooperation with numerous Russian and international organizations. Preliminary launch time - 2011. The goal of the project is to carry out investigations of various types of astrophysical objects of the Universe with an unprecedent high angular resolution in the centimeter and decimeter wavelength bands. Such resolution is attained by the 10 m Space Radio Telescope (on-board of the Spacecraft Spectr-R) working together with the largest ground radio telescopes in the interferometer mode.

Parameters of the Orbit
Period (variable) Major semi-axis 7 - 10 days. 189 000 km. 51.6°. From 10 000 to 70 000 km.

Main Parameters of the RadioAstron Mission
Frequency band [GHz] Bandwidth, 2-pol. [MHz] Fringe size at 350.000 km baseline [micro arcsec] Detection limit 1- [mJy] (ground radio telescope GBT, 16/4 MHz bandwidth, 300 s integration) 0,327 2x4 1,665 2 x 32 4,83 2 x 32 18 - 25 2 x 32

Initial inclination The perigee variation [ orbit evolution due to the Moon gravity ]

540

106

37

7 - 10

42

4

4

10

Investigations with the Space-Ground RadioAstron interferometer
· obtaining the continuum, polarized and spectral images of various types of sources with moderate and ultra high angular resolution at the whole range of baselines projections; · measuring the sources coordinates, proper motions and structure variations; · high precision determination of the RadioAstron orbit parameters.

The unprecedented super high angular resolution up to 1 µarcsec

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Design and Testing of the Space Radio Telescope

The Scientific Program of the RadioAstron Observatory
· Galactic nuclei (supermassive black holes, event horizon, particles acceleration, ultimate brightness temperatures, Faraday rotation, magnetic fields, cosmic rays, superluminal motion). · Cosmology effects; redshift dependence of various physical parameters of galactic nuclei; dark matter and dark energy effects. · Star and planetary systems formation, masers and Megamasers. · Stellar mass black holes and neutron stars. · Interstellar and interplanetary media. · Fundamental astrometry and development of the high precision celestial coordinate frame. · Development of the high precision model of the Earth gravitational field.
Astro Space Center, P. Lebedev Physical Institute, Russian Academy of Science 84/32 Profsoyuznaya St, Moscow, Russia 117997 Tel: +7 495 333-23-78, http://www.radioastron.ru

http://www.radioastron.ru