{"id":1719,"date":"2014-10-20T21:54:37","date_gmt":"2014-10-20T21:54:37","guid":{"rendered":"http:\/\/www.lifeandnews.com\/articles\/?p=1719"},"modified":"2014-10-20T21:54:37","modified_gmt":"2014-10-20T21:54:37","slug":"attention-all-martian-satellites-and-rovers-a-comet-is-coming","status":"publish","type":"post","link":"https:\/\/www.lifeandnews.com\/articles\/attention-all-martian-satellites-and-rovers-a-comet-is-coming\/","title":{"rendered":"Attention all Martian satellites and rovers \u2013 a comet is coming"},"content":{"rendered":"

By Monica Grady<\/a>, The Open University<\/em><\/span><\/p>\n

As every good marketing manager knows, value for money is a major driver for the success of a product. Being a bargain is not usually a feature of space projects, but planetary scientists will get two for the price of one on October 19 when instruments designed to look downwards onto Mars\u2019 surface will look outwards to a comet. The close passage of Comet Siding Spring<\/a> by Mars is providing astronomers with the opportunity to obtain the type of data usually only recorded by observations made on or close to the Earth.<\/p>\n

Comet Siding Spring will be whizzing past Mars at a distance of about 140,000km from the surface \u2013 that is just over a third of the distance between Earth and the moon. If a comet came this close to the Earth, dust from the comet\u2019s tail would enter Earth\u2019s atmosphere, providing a spectacular display of shooting stars.<\/p>\n

The comet\u2019s trajectory should lead to unprecedented visual opportunities. There is one set of cameras in place on Mars which, so far, have either been focused on the distant view of Mount Sharp at the centre of Gale Crater, or have been almost nose-to-nose with the crater\u2019s rocky outcrops. The Curiosity<\/a> rover has spent just over two years taking pictures of Mars\u2019 surface. Now, however, the rover is getting the chance to broaden its horizons, by looking upwards into the atmosphere, as mission scientist hope to observe, for the first time ever, meteor trails from Mars\u2019 surface.<\/p>\n

We are all familiar, from images, if not from first-hand experience, what a shooting star or meteor trail looks like \u2013 a bright flash in the sky, usually white, sometimes orange or green. (The colour being related to the chemical composition of the dust grain which is burning up.)<\/p>\n

But will they look the same as they traverse Mars\u2019 much thinner atmosphere? Frictional heating will be less, so will the dust grains burn up at all? Maybe they will take longer to burn, leading to longer trails. We don\u2019t know.<\/p>\n

As well as cameras looking up from Mars\u2019 surface, those based on orbiting satellites will also turn away from the red planet, towards the fast-paced traveller. The US National Aeronautical and Space Administration (NASA), the European Space Agency (ESA) and Indian Space Research Organisation (ISRO) have all repositioned their spacecraft to take advantage of the comet\u2019s passage, while ensuring that the spacecraft are not in danger.<\/p>\n

The timing is excellent for NASA\u2019s most recent arrival, the MAVEN orbiter<\/a>. This spacecraft is specifically designed to analyse Mars\u2019 atmosphere, observing cloud formation and wind currents, as well as the interaction between energetic particles from the sun with atmospheric gases. Although still in the very earliest stages of its mission, MAVEN has already delivered some exciting results<\/a> about Mars\u2019 upper atmosphere. Now, however, Comet Siding Spring will give MAVEN\u2019s instrument scientists additional food for thought as they observe how dust particles, as well as charged and neutral particles from the comet\u2019s tails, interact with the atmosphere.<\/p>\n

ESA scientists, deeply involved in the Rosetta mission<\/a> to comet 67P\/Churyumov-Gerasimenko, and preparing for positioning of the Philae lander<\/a> on the comet\u2019s surface on November 12, are also excited by the opportunity presented by Comet Siding Spring. Although the images that have been obtained of 67P\u2019s surface are the most detailed<\/a> that we have ever got of a comet, they are of a comet that has not yet developed the characteristic tail associated with comets that are closer to the sun.<\/p>\n

Comet Siding Spring will be in its full-blown glory, with a coma and tails, and cameras on board ESA\u2019s Mars Express orbiter are set to record high-resolution images of the nucleus in this state. This would provide valuable preparatory data for the later phases of the Rosetta mission as the spacecraft travels alongside comet 67P when it gets closer to the sun and develops its own tail.<\/p>\n

Earth-based telescopes, as well as a variety of space telescopes, are also planning to get in on the act, with observing campaigns planned across all wavelengths from the optical out to X-rays. It seems that the fly-by of Mars by Comet Siding Spring isn\u2019t so much a \u201cbuy one, get one free\u201d opportunity, simply a free gift for several different communities of space scientists.<\/p>\n

\"The<\/p>\n

Monica Grady does not work for, consult to, own shares in or receive funding from any company or organisation that would benefit from this article, and has no relevant affiliations.<\/em><\/p>\n

This article was originally published on The Conversation<\/a>.
\n Read the original article<\/a>.\n <\/p>\n","protected":false},"excerpt":{"rendered":"

By Monica Grady, The Open University As every good marketing manager knows, value for money is a major driver for the success of a product. Being a bargain is not usually a feature of space projects, but planetary scientists will get two for the price of one on October 19 when instruments designed to look […]<\/p>\n","protected":false},"author":39,"featured_media":1720,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[118],"tags":[],"_links":{"self":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts\/1719"}],"collection":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/comments?post=1719"}],"version-history":[{"count":1,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts\/1719\/revisions"}],"predecessor-version":[{"id":1721,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts\/1719\/revisions\/1721"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/media\/1720"}],"wp:attachment":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/media?parent=1719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/categories?post=1719"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/tags?post=1719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}