Rosetta - Post Separation Ops at Comet 67P C-G, November 14, 2014 - |
Rosetta - Post Separation Ops at Comet 67P C-G, November 14, 2014 - |
Nov 14 2014, 05:17 AM
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Senior Member Group: Members Posts: 2087 Joined: 13-February 10 From: Ontario Member No.: 5221 |
I think I heard it mentioned during the press conference today, (I can't find it now), about Rosetta itself possibly landing eventually, similar to what NEAR did at the end of the main mission at Eros? Since it's not like there's anywhere else to go with the remaining delta-v left by the end of 2015, and sunlight levels and activity starting to drop after perihelion, and the low gravity makes the difference between orbiting and 'landing' trivial. The whole thing would weigh a kilo or two, right?
Obviously there's a few more pressing concerns right now, but it's something to eventually think about. |
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Jan 17 2015, 12:14 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
That's an annotated, brightness-stretched resized crop of this NavCam image:
The streak is probably the track of a dust grain, the red line as a reference line. The streak is curved. This indicates acceleration. The cause may be drag by gas coming from a different direction, interaction with solar wind, or interaction with photons. These possible mechnisms may also apply to dust jets. Small charged grains may also interact with Sun's magnetic field (Lorenz force). So we've several possible causes for the curvature of the jets. See also this FAQ, or a little more detailed here. Wikipedia version. |
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