Crash Landing Mars. Software Failure Indicated Schiaparelli. Muskspeak. Moon of Kuiper. Bob Zimmerman,



(Photo: Mars orbiter find the parachute (white) and the lander on the surface)

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Crash Landing Mars. Software Failure Indicated Schiaparelli. Muskspeak. Moon of Kuiper. Bob Zimmerman,

Schiaparelli failure focuses in on altimeter data

The investigation into the landing failure last week of the ExoMars 2016 lander, Schiaparelli, is now focusing on a failure in the spacecraft’s altitude software.

The most likely culprit is a flaw in the craft’s software or a problem in merging the data coming from different sensors, which may have led the craft to believe it was lower in altitude than it really was, says Andrea Accomazzo, ESA’s head of solar and planetary missions. Accomazzo says that this is a hunch; he is reluctant to diagnose the fault before a full post-mortem has been carried out. But if he is right, that is both bad and good news.

European-designed computing, software and sensors are among the elements of the lander that are to be reused on the ExoMars 2020 landing system, which, unlike Schiaparelli, will involve a mixture of European and Russian technology. But software glitches should be easier to fix than a fundamental problem with the landing hardware, which ESA scientists say seems to have passed its test with flying colours. “If we have a serious technological issue, then it’s different, then we have to re-evaluate carefully. But I don’t expect it to be the case,” says Accomazzo.


“…Astronomers Gábor Marton and Csaba Kiss (Konkoly Observatory, Hungary), and Thomas Müller (Max Planck Institute, Germany) have identified a moon orbiting 2007 OR10. They spotted it in Hubble Space Telescope images taken in September 2010 as part of a survey of trans-Neptunian objects. Marton announced the discovery this week at a joint meeting of the AAS's Division for Planetary Sciences and the European Planetay Science Congress.

Although 2007 OR10 itself has been known for almost a decade, only recently have researchers realized that it's surface is quite dark and therefore that it must be quite sizable, with an estimated diameter of 1,535 km (955 miles). This makes it the third-largest dwarf planet, after Pluto and Eris. It also ranks third for distance — 13 billion km or 87 astronomical units away — drifting among the stars of central Aquarius at a dim magnitude 21.

For now, not much is known about its companion. Aside from HST's 2010 survey, the discoverers report a tentative detection of the moon in images from 2009. It orbits at a distance of at least 15,000 km, but more specifics are lacking. However, Marton's team has requested more HST time for follow-up observations. As soon as a reliable orbital radius and period are found, quick calculations will yield the mass of 2007 OR10 and its overall density.]…”

Oct 26, 2016, 06:06 AM
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