On 26 January, Mars Express completed its 7777th orbit around the Red Planet, an auspicious milestone as the satellite is readied for the closest-ever flyby of Phobos, scheduled for just a few weeks from now.
Mars Express has been in orbit since 25 December 2003, returning a wealth of scientific information and some of the most stunning high-resolution imagery of the Red Planet ever. Its data have allowed scientists to measure the abundance of water ice and vapour in the martian subsurface, surface and the atmosphere, as well as previously unknown methane in the atmosphere. Mars Express’ highly elliptical orbit will enable Mars Express, on 3 March, to conduct the closest flyby and examination of Phobos, Mars’ largest moon. The flyby, at a planned altitude of just 50 km, will collect very precise radio Doppler data to help determine the moon’s gravity field more accurately than ever.
Auspicious orbit marks run-up to Phobos flyby
New concept may enhance Earth-Mars communication
Direct communication between Earth and Mars can be strongly disturbed and even blocked by the Sun for weeks at a time, cutting off any future human mission to the Red Planet. An ESA engineer working with engineers in the UK may have found a solution using a new type of orbit combined with continuous-thrust ion propulsion. The European researchers studied a possible solution to a crucial problem affecting future human missions to Mars: how to ensure reliable radio communication even when Mars and Earth line up at opposite sides of the Sun, which then blocks any signal between mission controllers on Earth and astronauts on the red surface. The natural alignment, known as a conjunction, happens approximately every 780 days, and would seriously degrade and even block transmission of voice, data and video signals.
MARSIS data reveal new method to measure the magnetic field of Mars
Unusual signals detected by the Mars Express MARSIS instrument have been used to determine the magnetic field strength of Mars. In a forthcoming issue of Icarus, Ferzan Akalin and colleagues demonstrate how the MARSIS instrument can be used as a magnetometer – an unexpected application with important consequences for studies of local plasma effects and the Mars Express spacecraft environment.
Craters, lava flows and tectonic features near Ma’adim Vallis
The Mars Express High Resolution Stereo Camera imaged a region close to Ma’adim Vallis, one of the largest canyons on Mars, finding craters, lava flows and tectonic features.
After Valles Marineris, Ma’adim Vallis is one of the largest canyons on Mars. The region, lying south-east of Ma’adim Vallis, was imaged on 24 December 2008. The pictures are centred at about 29°S and 182°E and have a ground resolution of 15 m/pixel.
ESA and NASA establish a joint Mars exploration initiative
On 29 and 30 June the ESA Director of Science and Robotic Exploration, David Southwood, met NASA’s Associate Administrator for Science, Ed Weiler, in Plymouth, UK, to establish a way for a progressive programme for exploration of the Red Planet. The outcome of the bilateral meeting was an agreement to create a Mars Exploration Joint Initiative (MEJI) that will provide a framework for the two agencies to define and implement their scientific, programmatic and technological goals at Mars.
Discussions between ESA and NASA began in December 2008, driven by the ESA Ministerial Council’s recommendation to seek international cooperation to complete the ExoMars mission and to prepare further Mars robotic exploration missions. At the same time, NASA was reassessing its Mars Exploration Program portfolio after the launch of its Mars Science Laboratory was delayed from 2009 to 2011.
Mars Express observes aurorae on the Red Planet
Scientists using ESA’s Mars Express have produced the first crude map of aurorae on Mars. These displays of ultraviolet light appear to be located close to the residual magnetic fields generated by Mars’s crustal rocks. They highlight a number of mysteries about the way Mars interacts with electrically charged particles originating from the Sun.
The aurorae on Mars were discovered in 2004 using the SPICAM ultraviolet and infrared atmospheric spectrometer on board Mars Express. They are a powerful tool with which scientists can investigate the composition and structure of the Red Planet’s atmosphere.
Mars Express acquires sharpest images of martian moon Phobos
Mars Express closed in on the intriguing martian moon Phobos at 6:50 CEST on 23 July, flying past at 2.96 km/s, only 100 km from the centre of the moon. The ESA spacecraft’s fly-bys of the moon have returned its most detailed full-disc images ever, also in 3-D, using the High Resolution Stereo Camera on board.
Phobos is what scientists call a ‘small irregular body’. Measuring 27 km × 22 km × 19 km, it is one of the least reflective objects in the Solar System, thought to be a captured asteroid or a remnant of the material that formed the planets.
Mars Express to rendezvous with Martian moon
Scientists and engineers are preparing ESA’s Mars Express for several close fly-bys of the Martian moon Phobos. Passing within 100 km of the surface, Mars Express will conduct some of the most detailed investigations of the moon to date.
The series of fly-bys will take place between 12 July and 3 August. During the second encounter, the spacecraft will fly within 273 km of the surface. Six days later, Mars Express will close to within just 97 km.
Mars Sample Return: the next step in exploring the Red Planet
ESA and the Centre National d’Etudes Spatiales (CNES) will be co-hosting, in cooperation with NASA and the International Mars Exploration Working Group (IMEWG), an International Conference on 9 and 10 July in the Auditorium of the Bibliothèque Nationale de France in Paris* to discuss the next step in the exploration of Mars.
We are still collecting data under NASA’s Phoenix, Mars Reconnaissance Orbiter, Mars Exploration Rover and Mars Odyssey missions, as well as under ESA’s Mars Express mission, as we prepare for even more exciting missions to come, notably NASA’s Mars Science Laboratory and ESA’s ExoMars. Mars exploration is continuing at a steady pace and future missions will integrate scientific payloads and technologies that will eventually serve the ultimate goal of carrying out a manned mission to Mars. The international community has for a long time agreed that the next imperative step, one which will exponentially increase our knowledge and understanding of the Red Planet and its environment, is a Sample Return Mission.
Mars500 – European candidates selected
Last week, 32 talented candidates gathered at the European Astronaut Centre in Cologne, Germany, with the hope of becoming part of a unique study that will act as a platform for human exploration of the Solar System. The study, called Mars500, is a ground-based simulation of a mission to Mars and back.
Two of the candidates, together with four Russian volunteers, will be sealed in an isolation chamber for a total of 105 days starting in October. This is followed by the full isolation period with another two European candidates, which lasts for 520 days starting early in 2009.