Mercury Science |
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Mercury Science |
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#31
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 ![]() |
Quite easily. Mercury at Aphelion should be about 39 kps. Mariner X was 55 kps. Your probe would be 58 kps.
As before, someone should double-check this before you reply on it to actually launch something. :-) I used this formula from Wikipedia http://en.wikipedia.org/wiki/Orbital_mechanics#Velocity --Greg |
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#32
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![]() Member ![]() ![]() ![]() Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 ![]() |
Wow.
That is getting right up there. Appreciate the calculations. Gives a vivid idea of the challenges in navigating that region of the solar system. All those sharp, unblurred Mariner 10 pictures are quite an achievement, considering the flyby speed. (I am not likely to be sending any of my own spacecraft on this trajectory, the Legos would melt) |
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#33
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Solar System Cartographer ![]() ![]() ![]() ![]() Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 ![]() |
Not much action on here, but every workday there's a new image from MESSENGER. Here I have joined two nice color images of the Tolstoj area.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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#34
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 ![]() |
Wow ! It looks like a deep field with many galaxies, nebulas and stars. Magnificent !
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#35
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![]() Member ![]() ![]() ![]() Group: Members Posts: 146 Joined: 23-August 06 From: Vriezenveen, Netherlands Member No.: 1067 ![]() |
Reminds me of Callisto
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#36
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2082 Joined: 13-February 10 From: Ontario Member No.: 5221 ![]() |
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#37
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![]() Member ![]() ![]() ![]() Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 ![]() |
First burn in orbit around Mercury (ever!) Second. First burn Messenger successfully completed June 15, 2011 http://messenger.jhuapl.edu/news_room/details.php?id=173 -------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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#38
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Solar System Cartographer ![]() ![]() ![]() ![]() Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 ![]() |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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#39
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Solar System Cartographer ![]() ![]() ![]() ![]() Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 ![]() |
A comparison of presumably vent-like structures on Mercury and the Moon at the same scale. The Mercury pic was part of the press conference on JUne 16th, where it was captioned 'Etched Terrain"
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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#40
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Newbie ![]() Group: Members Posts: 10 Joined: 27-August 12 Member No.: 6618 ![]() |
New results on mercury shrinkage discussed in at a meeting of the American Geophysical Union in San Francisco, yesterday :
QUOTE Studies of Mercury show that it has shrunk by about 11 kilometres across since the Solar System's fiery birth 4.5 billion years ago. As the planet cooled and contracted, it became scarred with long curved ridges similar to the wrinkles on a rotting apple. A new census of these ridges, called lobate scarps, has found more of them, with steeper faces, than ever before. The discovery suggests that Mercury shrank by far more than the previous estimate of 2-3 kilometres, says Paul Byrne, a planetary scientist at the Carnegie Institution for Science in Washington DC. He presented the results today at a meeting of the American Geophysical Union in San Francisco, California. The finding helps explain how Mercury's huge metallic core cooled off over time. It may also finally reconcile theoretical scientists, who had predicted a lot of shrinkage, with observers who had not found evidence of that — until now. “We are resolving a four-decades-old conflict here,” Byrne told the meeting. Planetary scientists have been arguing over Mercury's lobate scarps ever since the Mariner 10 spacecraft flew past the planet three times in 1974-75. Researchers can use measurements of the length and height of the scarps to calculate how much planetary shrinkage they represent. That shrinkage is a product of Mercury's odd composition — “like a core floating through space with a thin outer blanket,” says Byrne. Most of the planet is made of that large core, and so it would have cooled rapidly as heat rushed toward its surface. Modelling studies have long suggested that the planet should have shrunk by 10-20 kilometres over its lifetime, compared to the 2-3 kilometres estimated from Mariner 10 data1. The latest estimates come from NASA’s MESSENGER probe, which photographs and measures Mercury's topography. Last year, Italian scientists used MESSENGER data covering one-fifth of the planet to show that its shrinkage was probably greater than the Mariner 10 estimates. The latest work, covering the entire planet, revealed many lobate scarps with sharp vertical relief, Byrne said. It also uncovered details on another kind of surface feature that may be related to shrinkage. These ‘wrinkle ridges’ are less pronounced than the lobate scarps but may also have formed during contraction. Combined, the data on the lobate scarps and the wrinkle ridges suggest that Mercury's diameter has shrunk by 11.4 kilometres, Byrne said. Even leaving out the wrinkle ridges gives 10.2 kilometres of contraction. Those numbers are plausible to at least one planetary scientist who studied Mercury’s shrinkage using Mariner 10 data in the 1970s. Jay Melosh, a planetary geologist at Purdue University in West Lafayette, Indiana, suspects that even more lobate scarps may be lurking out there. “Many of these things may still be hiding,” he says. “As far as I'm concerned, this may be an underestimate of the amount of shrinkage.” Nature news Nature doi:10.1038/nature.2013.14331 -------------------- |
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#41
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Solar System Cartographer ![]() ![]() ![]() ![]() Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 ![]() |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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#42
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![]() Merciless Robot ![]() ![]() ![]() ![]() Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 ![]() |
![]() Nobody told him there'd be days like these. An excellent tribute. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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#43
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 ![]() |
I suppose that's appropriate. "Imagine there's no atmosphere . . "
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#44
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![]() Interplanetary Dumpster Diver ![]() ![]() ![]() ![]() Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 ![]() |
Roll on John! Perhaps they can bend the rules for Bob Dylan. -------------------- |
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#45
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Member ![]() ![]() ![]() Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 ![]() |
And when will they add Freddy Mercury ?? ;-)
Marc. |
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