Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Weather-Cocked > FreeForAll
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 11-06-2017, 12:50 AM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
 
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
Default Real "asteroid drill"

Hello All,

Here (see: http://www.spacedaily.com/reports/A...ercise_999.html and http://iawn.net/frequently-asked-questions/ ) are the results of the first real international “asteroid encounter drill” that was recently conducted, when asteroid 2012 TC4 passed only about 27,200 miles (43,780 kilometers) above the Earth on October 12th. ALSO:

The NASA Goddard Space Flight Center is evaluating and moving to test, aboard a CubeSat space probe to a short-period comet, a coin-size microbolometer camera (see: http://www.spacedaily.com/reports/N...oids_999.h tml ) to both characterize comets via their infrared-measured temperatures *and* (as part of a different but associated project) to characterize asteroids on collision courses with Earth—and to serve as a terminal guidance sensor for an asteroid-deflecting or comet-deflecting impactor spacecraft (a vehicle of the DART type, see: http://www.google.com/search?source...1.0.pUAzo4SUHRw ).

I hope this information will be helpful.
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR
Reply With Quote
  #2  
Old 11-06-2017, 08:41 AM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

Speaking of asteroids and comets, today's Astronomy Picture of the Day is a nice shot of Comet 67P by the Rosetta spacecraft.

https://apod.nasa.gov/apod/image/17...osetta_2048.jpg
__________________
I love sanding.
Reply With Quote
  #3  
Old 11-07-2017, 03:45 AM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
 
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
Default

Quote:
Originally Posted by tbzep
Speaking of asteroids and comets, today's Astronomy Picture of the Day is a nice shot of Comet 67P by the Rosetta spacecraft.

https://apod.nasa.gov/apod/image/17...osetta_2048.jpg
Thank you for posting this--it's intriguing that such bright, glowing (by fluorescence as well as reflected sunlight) objects have the darkest known surfaces. I'm rather surprised that there is so much relatively smooth surface on the nucleus, since the ices sublime without melting in the vacuum (which would let them flow like the lava of the lunar maria, which the nucleus' smooth areas resemble). It also looks like there's a small jet of volatiles escaping from beneath the dark crust, about 2/3 of the way down from the top, just right of center, and:

We need to visit more comets, for purely scientific, planetary defense, and resource assaying reasons (some asteroids with eccentric orbits are actually extinct comets). As David Portree and others have documented (see: http://www.google.com/search?source...0.jEdTLF 455xU ), there have been numerous proposals for comet missions, including multiple-target flyby and slow flyby missions (electrical propulsion makes rendezvous missions practical, although flyby missions can examine multiple comets--and asteroids--to gather less detailed "population characteristics" data on several targets). Also:

As Rosetta demonstrated, station keeping maneuvers, "polyhedron orbits" (that is, three-dimensional, "propulsive turn" orbits [Rosetta flew pyramid orbits around Comet Churyumov-Gerasimenko's nucleus]), and proximity operations at comet nuclei are very easy, due to comets' negligible gravity. Some comets, such as Giacobini-Zinner ("GZ," the first comet ever to be visited, by the re-purposed ISEE-3 [re-named ICE] spacecraft: http://www.google.com/search?ei=pH4...1.0.0wSZV_bhYLU ), have oddly-shaped, centrifugal force-stretched nuclei; Comet GZ's approximately 2 kilometer-wide nucleus is thought to perhaps be a rapidly-spinning, pancake shape, with an equatorial radius eight times that of the polar radius.
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR

Last edited by blackshire : 11-07-2017 at 06:48 AM.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 10:55 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024