Mars Express Blog

Mars Express Blog http://webservices.esa.int/blog/blog/7 Mars Express is Europe’s first planetary mission. At launch, the mission consisted of an orbiter carrying seven instruments for remote sensing observations of the planet, and a lander (Beagle 2) for on-the-spot measurements of Martian rock and soil. Mars Express started science observations at the Red Planet in January 2004, and since then it has been delivering an incredible amount of scientific results. The ‘Express’ part of the name highlights the fact that the spacecraft was built more quickly than any other comparable planetary mission. In fact, it took only five years from mission approval to launch. In addition to global studies of the surface, subsurface and atmosphere of Mars with unprecedented spatial and spectral resolution, the unifying theme of the Mars Express mission from orbit is the search for water in its various states, everywhere on the planet by all its seven instruments using different techniques. danielscuka 2013-02-11T09:52:50Z New MEX blog platform http://webservices.esa.int/blog/post/7/1391 We're renovating! We're transfering the Mars Express blog to the new Wordpress platform. Effective immediately, all news, updates and information that would have appeared here in the 'old' MEX blog will be published via <a href="http://blogs.esa.int/mex" target="_blank">http://blogs.esa.int/mex</a>. <hr /> General 2012-07-18T05:01:57Z danielscuka Mars Express transmits first signal to be received by new ESA station http://webservices.esa.int/blog/post/7/1390 <a href="http://www.flickr.com/photos/esa_events/7419567666/" title="First signal received by Malargüe station by ESA_events, on Flickr"><img src="http://farm9.staticflickr.com/8160/7419567666_debce9db98_m.jpg" alt="First signal received by Malargüe station" width="240" height="180" align="left" /></a> Great news from the ESA ESTRACK team today! The first-ever reception of signal took place at ESA's new 35m deep space station at Malargüe, Argentina, on 14 June. There's still a lot of work to be done to have the station fully comissioned, but this is an excellent achievement and an important milestone - and the signal came from our very own Mars Express, orbiting the Red planet some 193 million km away. Roberto Maddè, the DSA-3 project manager, wrote: We did a test 'shadow tracking' of Mars Express last week on 14 June, around 22.30 UTC. The signal in L-band is shown in the picture (at left). We measured a signal/noise ratio of about 56 dBHz, which matches the levels obtained by ESA's existing 35m station at Cebreros during the same pass. Pointing still needs to be optimised (pointing correction for our test was done manually); these tests are still 'qualitative'. Some quantitative tests (less news-worthy but more useful to understand whether the station is operating within specs) are being done and look promising. Now, the teams on site are recalibrating the beam waveguide mirrors; we'll have more tests in two weeks. But we need to calibrate the pointing first. DSA-3 is set to enter regular service later this year. <a href="http://www.esa.int/SPECIALS/Operations/SEME9C19Y8G_0.html" target="_blank" title="DSA-3 webcam">You can see DSA-3 'live' via our webcam</a> (also below) -- Daniel <img src="http://download.esa.int/esoc/mlg/mlg.jpg" border="1" alt="MLG Webcam" hspace="2" vspace="2" width="400" height="300" align="middle" />     <a href="http://www.flickr.com/photos/esa_events/7419567666/" title="First signal received by Malargüe station by ESA_events, on Flickr"></a> General ESTRACK Operations 2012-06-22T15:25:17Z danielscuka Tracking tiny slices of time: Phobos blocks Mars Express signal http://webservices.esa.int/blog/post/7/1387 On 30 April, in a carefully planned data-gathering exercise, ESA's Mars Express team used the passage of Phobos between Earth and the spacecraft to record precisely when a radio signal was blocked. The data may now lead to the best-ever determination of Phobos's orbit, knowledge that will help scientists better understand our planetary neighbour and its double-moon system. You'll recall our earlier posting, when we described MEX team plans to take advantage of a rare alignment of Earth - Phobos - Mars Express to measure precisely when the bulk of Phobos would block radio communications between the spacecraft and ESA's 35m Cebreros station in Spain. The prediction was that the 'occultation' would last around 12 seconds, from 21:21:22.9 to 21:21:34.1 UTC (spacecraft time). The predicted ground receive time was between 21:29:13.0 and 21:29:24.2 UTC (i.e. 7:50 mins later on Earth). The activity took place as planned on Monday, 30 April. Based on a reconstruction of the MEX orbit by ESA's Flight Dynamics team at ESOC, results indicate that the expected start time of the occultation by Phobos was 0.5 seconds earlier than that predicted. Similarly, the end time is 0.4 seconds earlier than predicted. The plot below indicates the actual situation as measured very precisely from Cebreros station.   <a id="res_21136" href="http://webservices.esa.int/blog/gallery/7/phobos_occultation_mars_express-2012.png"></a> <div style="text-align: center"> <a id="res_21136" href="http://webservices.esa.int/blog/gallery/7/phobos_occultation_mars_express-2012.png"><img src="http://webservices.esa.int/blog/gallery/7/previews-med/phobos_occultation_mars_express-2012.gif" border="0" /></a> </div>     It shows the view from Earth of the 'expected' occultation of the MEX signal by Phobos. The large, grey-green circle corresponds to the moon's disk; it is shown (at this scale) as a circle having a radius of 13.4 km. So why was the actual recorded occultation times a few seconds shorter than expected? ESA's Trevor Morley, lead flight dynamics specialist for Mars Express, says there are two possible reasons: <ol> <li>The best fit ellipsoid for the shape of Phobos has semi-axes of 13.4 x 11.2 x 9.2 km. The dashed circle shown in the plot has a radius of 9.2 km. The occultation duration depended upon the length of the chord across the real face of Phobos between the entry and exit points. The actual profile of Phobos needs to be applied to calculate this length (which is why photos/observations of Phobos are so important - Ed).</li> <li>A shorter than expected occultation duration would also occur if the present error in our prediction of Phobos's orbit is such that the moon's true position at the time was further towards the south.</li> </ol> Trevor says that the recorded timing data will now be shared with the MEX science team as well as with colleagues at NASA JPL; it is expected that they will be able to use these results to improve models of the Phobos orbit: “The Phobos orbit model that we are presently using was generated by Bob Jacobson of JPL and is almost certainly the most accurate one available. We will provide Bob with all the signal data plus our determined orbit of MEX,” he added. “Of course we can provide the data to any scientists working on this topic, including those who have been using directional data derived from Phobos images made by the MEX camera for the same purpose.” Mars Express Spacecraft Operations Manager Michel Denis says: <blockquote> It's part of the scientific method to make use of every opportunity to investigate our natural world. Also, it's second nature and ‘pride of craft’ for the mission operators to figure out how to achieve more with the same resources– whether that’s a spacecraft or a ground station. In this case, we could also achieve ‘extra science’ through tight cooperation between several teams here at ESOC – flight dynamics, ground segment, flight controllers – and we were able to fine-tune, second-by-second, an already packed science and communication plan. The team here have really done a nice job! </blockquote> General Science Operations Phobos 2012-05-04T11:56:29Z danielscuka Mars Express radio signals to 'track' Phobos orbit http://webservices.esa.int/blog/post/7/1386 On Monday, 30 April, Mars Express mission controllers at ESOC will take advantage of a rare alignment of the spacecraft with Phobos and Earth to use radio signals to determine the Martian moon's orbit. A (very) rough sketch of the alignment <img src="http://webservices.esa.int/blog/gallery/7/234-150206PhobosShadow_H.jpg" align="right" />If the team's careful planning and preparation pay off, the occultation of Mars Express by Phobos (as seen from Earth) will provide highly accurate data that can be used to determine Phobos's orbit with unprecedented accuracy, possibly improving it by a factor of 2. Essentially, here's what's going to happen: <ul> <li>On 30 April, Phobos will, for a few seconds, pass between MEX and Earth, blocking the direct line-of-sight path for radio signals transmitted from MEX to ESA's 35m deep-space station at Cebreros, Spain. </li> <li>In a pointing specially extended for this event, Mars Express will already be turned toward Earth — a mere pale blue dot some 140 mn km away<style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} </style> — and will already be transmitting a steady signal to Cebreros. </li> <li>Special radiometric recording equipment installed at the Cebreros ESTRACK station will record — with sub-second precision — the start/finish time of the break in the transmission. </li> <li>The occultation is predicted to last just 12 seconds, from 21:21:22.9 to 21:21:34.1 UTC (spacecraft time). The predicted ground receive time is between 21:29:13.0 and 21:29:24.2 UTC (i.e. 7:50 mins later on Earth). </li> <li>Once the occultation ends, MEX will perform a 'high-speed' slew to re-orient itself so that the HRSC camera and other instruments are pointing toward Mars to conduct a regular observation pass over the Red Planet starting at 21:22 UTC.</li> </ul> Results from Cebreros station will be passed to ESA's flight dynamics team and to our colleagues at NASA's JPL, who will use these times in calculations that, once confirmed, could yield the best-ever determination of the moon's orbit. "The occultation tracking promises to provide a very nice boost in our understanding of Phobos, an enigmatic body if ever there was one, without affecting routine science," says Mars Express Spacecraft Operations Manager Michel Denis. We'll keep in touch with the Mars Express mission team at ESOC throughout the weekend and Monday/Tuesday to post any updates; you can also follow news via Twitter (@esaoperations). The animation below shows what will happen immediately after the occultation tracking, when Mars Express re-orients itself for the Mars observation pass. -- Daniel   <iframe frameborder="0" height="360" src="http://www.youtube.com/embed/kPiiHIGyS70" width="640"></iframe>   General Operations Phobos 2012-04-27T15:44:01Z danielscuka An elegant solution - update in ESA web http://webservices.esa.int/blog/post/7/1383 A quick link and extract from an update on Wednesday in ESA's Science directorate web pages; it provides a nice overview of the 'return to science' situation. References to our very own VMC camera activities highlighted - and note very nice comments on teamwork! Click link to read the full report. <blockquote> While full science operations have now been resumed, a number of tasks remain to be completed. Most important among these is the implementation of an OBCP scheduler. This will enable the spacecraft to operate autonomously for up to a week, compared to the few days that are possible with the current FAST system. Work is also in hand to resume operation of the Visual Monitoring Camera (<a href="http://webservices.esa.int/blog/index.php?blogId=6" target="_blank">VMC – the 'Mars webcam'</a>). Enormous team effort Completely redesigning the way in which Mars Express is controlled has involved an enormous amount of work for the mission control team at the European Space Operations Centre (ESOC), assisted by their counterparts at the European Space Astronomy Centre (ESAC), PI-teams, other ESA experts and partners in industry. Everyone involved with the mission is extremely grateful for their hard work. Although the 'Express' in Mars Express highlights that the mission was developed in a short time and with a relatively modest budget, the ability to resume full operations after a very serious failure shows that the resulting design is both robust and flexible. Mars Express has now been restored to full operational capability and its potential mission lifetime remains unchanged </blockquote> <a href="http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=50026" target="_blank" title="An elegant solution">Full report via ESA Science & Technology</a> General Science Operations Recovery 2012-02-16T10:10:13Z danielscuka Orcus Patera on Mars: What's in the crater? http://webservices.esa.int/blog/post/7/1379 A nice New Year's post starting the year with a question (and answer!) on the fabulous high resolution stereo camera (HRSC) image of Orcus Patera, first published by ESA (<a href="http://www.esa.int/esaSC/SEMDV9BO3DG_index_0.html" target="_blank">here</a>) in 2010, and reposted as the <a href="http://www.marstravel.org/2011/12/mars-photo-of-day-dec-31-2011.html" target="_blank">Image of the Day on 31 December 2011 at the Mars Travel blog</a>. Best wishes to everyone for a healthy and successful 2012. Details below! -- Daniel First, here's the image (click image to access the original post in ESA web):   <div style="text-align: center"> <a href="http://www.esa.int/esaSC/SEMDV9BO3DG_index_0.html" target="_blank" title="Original image via ESA web"><img src="http://webservices.esa.int/blog/gallery/7/472-20103007-2216-2238-6-co-01-OrcusPatera_300.jpg" border="1" alt="Orcus Patera is an enigmatic elliptical depression located between the volcanoes of Elysium Mons and Olympus Mons. This well-defined depression extends approximately 380 km by 140 km in a NNE–SSW direction. It has a rim that rises up to 1800 m above the surrounding plains, while the floor of the depression lies 400–600 m below the surroundings. The term ‘patera’ is used for deep, complex or irregularly shaped volcanic craters such as the Hadriaca Patera and Tyrrhena Patera at the north-eastern margin of the Hellas impact basin. However, despite its name and the fact that it is positioned near volcanoes, the actual origin of Orcus Patera remains unclear.Credits: ESA/DLR/FU Berlin (G. Neukum)" align="middle" /></a> </div>   <a href="http://download.esa.int/images/marsexpress/472-20103007-2216-2238-6-co-01-OrcusPatera_H1.jpg" target="_blank">Click for hi-res version </a> Orcus Patera is an enigmatic elliptical depression near Mars’s equator, in the eastern hemisphere of the planet. Located between the volcanoes of Elysium Mons and Olympus Mons, its formation remains a mystery. Often overlooked, this well-defined depression extends approximately 380 km by 140 km in a NNE–SSW direction. It has a rim that rises up to 1800 m above the surrounding plains, while the floor of the depression lies 400–600 m below the surroundings. Earlier today, Mars Travel blogger David Geaney sent in a question:  <blockquote> If you look at one of the central craters in Orcus Patera using the HRSC image, you will see there is something blue in the crater. What is the blue material? Thank you for your time and patience. </blockquote> We passed the query to Mars Express project scientist Olivier Witasse, who wrote: Hi David, The blue is not a lake.... It's dust, which emits in the blue part of the spectrum. In the data processing, the blue part is somewhat enhanced, which sometimes creates a wrong impression. Cheers, --Olivier     General Science 2012-01-02T14:30:46Z danielscuka MARSIS completes measurement campaign over Martian North Pole http://webservices.esa.int/blog/post/7/1378 <a id="res_21113" href="http://webservices.esa.int/blog/gallery/7/MARSIS2800_H_saup_410.jpg"><img src="http://webservices.esa.int/blog/gallery/7/previews/MARSIS2800_H_saup_410.gif" border="0" alt="Mars Express in orbit around Mars with the MARSIS antennae unfurled Date: 09 Dec 2011 Satellite: Mars Express Copyright: ESA This artist's illustration depicts Mars Express in orbit around Mars with the MARSIS antennas unfurled. The MARSIS experiment maps the Martian subsurface structure to a depth of a few kilometres." align="left" /></a>A comment today from Mars Express Spacecraft Operations Manager Michel Denis on this week's report: "<a href="http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=49771" target="_blank">MARSIS completes measurement campaign over Martian North Pole</a>." The report gives good news! "The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on board Mars Express has recently completed a subsurface sounding campaign over the planet's North Pole. The campaign was interrupted by the suspension of science observations several times between August and October due to safe modes and to anomalies in the operation of the spacecraft's Solid-State Mass Memory (SSMM) system. As MARSIS best observes in the dark, which for the North Pole only occurs every few years, it was among the first instruments to resume observations once a partial work-around for the problems had been implemented." In his comment below, the 'FAST Method' that Michel refers to is the operations team's newly developed way of uploading commands to Mars Express, which avoids using the problematic Solid State Mass Memory (SSMM) for critical commanding. The 'File-based Activities on Short Timeline' method essentially means that commands are grouped in very short self-contained files that can be loaded safely, in advance of execution, from the SSMM into an alternative memory unit (that is reliable but not as capacious as the SSMM). Michel writes: <blockquote> The FAST method - loading short command files upon need into the short onboard mission timeline - was put into use at the end of October 2011 with the (excellent) result that we could save what was remaining of the North Pole observation campaign by the MARSIS radar. The net loss in data collection was mitigated by using the existing MARSIS command sequences as soon as possible. Meanwhile, as for the other instruments, new MARSIS on-board control procedures (OBCPs) are under development and will allow operation with fewer commands, therefore enabling the operation of several science instruments in parallel. My main point? We did our job: contrary to widespread received wisdom, the spacecraft operators' role is not to simply watch over (supposedly) boring routine operations during the many long years of a mission - nor simply saving a spacecraft that experiences problems. In fact, we are relied upon to deliver safely as much of the expected (precious) scientific data as possible within the resources available - despite adversity. And that's what we're doing! </blockquote> General Science Operations Recovery 2011-12-16T15:19:24Z danielscuka ASPERA switch-on success :-) http://webservices.esa.int/blog/post/7/1376 This in this morning from Jonathan Schulster on the Mars Express operations team: <blockquote> The ASPERA (Energetic Neutral Atoms Analyser) instrument high voltage (kV) lines and equipment were successfully switched on today, a few minutes ago at Mars (~09:57 CET), using the new on-board control procedures (OBCP). These will run for one hour until 10:40CET today and the ASPERA science team will examine the recorded science data before giving the 'go-ahead' for full operations of ASPERA using only OBCP's starting 9 Jan uary 2012. Cheers! - Jonathan Schulster Mars Express Mission Planning & Flight Control Team </blockquote> Looks like another instrument is set to return to action! -- Daniel General Science Operations Recovery 2011-12-13T14:11:04Z danielscuka Mars Express steadily returns to routine operation http://webservices.esa.int/blog/post/7/1374 <a id="res_11608" href="http://webservices.esa.int/blog/gallery/7/mars_express_in_orbit_400.jpg"><img src="http://webservices.esa.int/blog/gallery/7/previews/mars_express_in_orbit_400.gif" border="0" align="left" /></a>Mission controllers are making excellent progress in returning Mars Express to routine service. Some science activities have already resumed after being temporarily suspended last month following a series of faults related to the onboard data storage system.   Having arrived around Mars in December 2003 for an initial two-year mission, the spacecraft is now in its eighth year of science operations. It has returned some of the most stunning images and valuable science data ever obtained from the Red Planet. In mid-October 2011, anomalies in the operation of its Solid-State Mass Memory (SSMM) system caused science observations to be temporarily halted. <a href="http://www.esa.int/SPECIALS/Operations/SEMYN9ZW5VG_0.html" target="_blank" title="Mars Express returns to service">Full story via ESA web</a> General Science Operations 2011-11-24T17:31:33Z danielscuka Mars Express observations temporarily suspended http://webservices.esa.int/blog/post/7/1373 Anomalies in the operation of the solid-state mass memory system on board Mars Express have caused science observations to be temporarily halted. A technical work-around is being investigated that will enable the resumption of a number of observations and should evolve into a long-term solution. In mid-August, Mars Express autonomously entered safe mode, an operational mode designed to safeguard both the spacecraft itself and its instrument payload in the event of faults or errors. The cause of entering the safe mode was a complex combination of events relating to reading from and writing to memory modules in the Solid-State Mass Memory (SSMM) system. This is used to store data acquired by the instruments and housekeeping data from the spacecraft's subsystems, prior to its transmission to Earth, and is also used to store commands for the spacecraft that have been received from the ground stations, while awaiting execution. <a href="http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=49549" target="_blank" title="ESA RSSD Site">More details in ESA's Science & Technology site</a>. General Science Operations 2011-10-31T11:36:14Z danielscuka