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posted by martyb on Saturday September 13 2014, @01:46PM   Printer-friendly
from the when-can-I-view-these-on-google-maps? dept.

http://www.jpl.nasa.gov/news/news.php?release=2014-308

Scientists have found that the surface of comet 67P/Churyumov-Gerasimenko—the target of study for the European Space Agency's Rosetta mission—can be divided into several regions, each characterized by different classes of features. High-resolution images of the comet reveal a unique, multifaceted world.

ESA's Rosetta spacecraft arrived at its destination about a month ago and is currently accompanying the comet as it progresses on its route toward the inner solar system. Scientists have analyzed images of the comet's surface taken by OSIRIS, Rosetta's scientific imaging system, and defined several different regions, each of which has a distinctive physical appearance. This analysis provides the basis for a detailed scientific description of 67P's surface. A map showing the comet's various regions is available at: http://go.nasa.gov/1pU26L2

The new comet maps will offer valuable insights for members of the Rosetta team, who are gathering in Toulouse, France, on September 13 and 14, to determine a primary and backup landing site from five candidates they previously had selected.

For background, see: Rosetta: Landing Site Search Narrows which was published on August 25, 2014:

The European Space Agency's Rosetta mission has chosen five candidate landing sites on comet 67P/Churyumov-Gerasimenko for its Philae lander. Philae's descent to the comet's nucleus, scheduled for this November, will be the first such landing ever attempted. Rosetta is an international mission spearheaded by the European Space Agency with support and instruments provided by NASA.

Choosing the right landing site is a complex process. It must balance the technical needs of the orbiter and lander during all phases of the separation, descent and landing, and during operations on the surface, with the scientific requirements of the 10 instruments on board Philae. A key issue is that uncertainties in navigating the orbiter close to the comet mean that it is possible to specify any given landing zone only in terms of an ellipse—covering about-four-tenths of a square mile (one square kilometer)—within which Philae might land.

 
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  • (Score: 1, Informative) by Anonymous Coward on Sunday September 14 2014, @04:52AM

    by Anonymous Coward on Sunday September 14 2014, @04:52AM (#92923)

    If you can match speed with a comet, you could enter its orbit, with or without the comet: they don't give you any useful ride.

    If you latch onto a comment and wait until its far out, if you let go, you will fall along its orbit, and keep following it: it won't help you launch anywhere.

    We have a couple of space craft heading out of the solar system already. Comets by definition are at less than escape velocity. We have already done much better than a ride on a comet can ever do.

    Consider learning basic orbital mechanics: all points on an orbit are energetically equivalent. This is trivially derived from conservation of energy. Your post makes no sense.

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  • (Score: 2) by aristarchus on Sunday September 14 2014, @07:56AM

    by aristarchus (2645) on Sunday September 14 2014, @07:56AM (#92948) Journal

    Sometimes, just going along for the ride is enough. Fair skies, Philae, and I hope you don't get fried in perihelion.

    --
    FatPhil: "F**k me, ran out of all of today's modpoints in just 10 minutes. "
  • (Score: 2) by evilviper on Sunday September 14 2014, @06:49PM

    by evilviper (1760) on Sunday September 14 2014, @06:49PM (#93113) Homepage Journal

    If you can match speed with a comet, you could enter its orbit, with or without the comet: they don't give you any useful ride.

    That's what the lasso is for... Some kind of very long cable on a winch to let the comet pull the craft, with lots of slack so to smooth out the sudden change in momentum.

    If you latch onto a comment and wait until its far out, if you let go, you will fall along its orbit, and keep following it: it won't help you launch anywhere.

    Having a solid and massive surface behind your craft, to push away from, can give you more of a boost than just firing rockets. You could do without it, but it's a beneficial option to have available.

    Comets by definition are at less than escape velocity.

    "Single-apparition or [non-periodic] comets are those with a hyperbolic or parabolic osculating, which makes them permanently exit the Solar System after a single pass of the Sun."

    We have already done much better than a ride on a comet can ever do.

    Utter nonsense!

    Voyager I is at 128.26 AU.

    "Long-period comets such as Comet West and C/1999 F1 can have apoapsis distances of nearly 70,000 AU"

    https://en.wikipedia.org/wiki/Long-period_comet#Long_period [wikipedia.org]

    Your post makes no sense.

    Your response is a combination of complete misunderstandings of my idea, as well as some some horrible misconceptions about space of your own.

    --
    Hydrogen cyanide is a delicious and necessary part of the human diet.