[meteorite-list] Fusion Crusted Asteroid?

From: Richard Kowalski <damoclid_at_meteoritecentral.com>
Date: Sun, 7 Mar 2010 20:29:40 -0800 (PST)
Message-ID: <544785.66055.qm_at_web113601.mail.gq1.yahoo.com>

2008 TC3 had an albedo of 5% before entry, or a little bit more reflective than fresh asphalt.

5% albedo is probably not that far off for many asteroids... BTW, the moon's albedo is about 7%, or about half way in reflectivity between fresh and worn asphalt...

--
Richard Kowalski
Full Moon Photography
IMCA #1081
--- On Sun, 3/7/10, Meteorites USA <eric at meteoritesusa.com> wrote:
> From: Meteorites USA <eric at meteoritesusa.com>
> Subject: [meteorite-list] Fusion Crusted Asteroid?
> To: "Meteorite-list" <meteorite-list at meteoritecentral.com>
> Date: Sunday, March 7, 2010, 9:08 PM
> About a year ago I asked a question
> about fusion crusted meteoroids and the possibility or
> probability of them given earth grazing asteroids.
> Fusion Crusted "Meteoroids" http://www.mail-archive.com/meteorite-list at meteoritecentral.com/msg72463.html
> 
> Now there's an article in New Scientist about "Dark
> Asteroids" that reflect only 5% of light it receives from
> the Sun. Could these be fusion crusted asteroids?
> 
> Did WISE find one?
> Dark, dangerous asteroids found lurking near Earth
> "...One of these objects is as dark as fresh asphalt,
> reflecting less than 5 per cent of the light it
> receives..."
> FULL ARTICLE: http://www.newscientist.com/article/dn18616-dark-dangerous-asteroids-found-lurking-near-earth.html
> 
> Why?, because I like asking questions that make people
> think open mindedly about possibilities...
> 
> Oh yeah, some related articles for ya's...
> 
> Suspected Asteroid Collision Leaves Odd X-Pattern of
> Trailing Debris
> http://www.nasa.gov/mission_pages/hubble/science/asteroid-20100202.html
> 
> Suspected Hypervelocity Collision in the Asteroid Belt
> http://geology.com/nasa/asteroid-collision/
> 
> Asteroid fragments on a fast collision course with Earth
> http://www.spaceref.com/news/viewpr.html?pid=14574
> 
> Asteroids Sunburn with Age:
> http://www.skyandtelescope.com/news/3309121.html?page=1&c=y
> 
> Asteroids Get a Surface Makeover When They Pass Near Earth
> http://www.scientificamerican.com/article.cfm?id=asteroid-quakes
> 
> Asteroid Craters In Relation to Age:
> http://www.newscientist.com/article/dn7699-145cosmic-botox-bashes-asteroid-wrinkles-away.html
> 
> Asteroid Age Fast With a Solar Wind Tan
> http://www.universetoday.com/2009/04/22/young-asteroids-age-fast-with-a-solar-wind-tan/
> 
> Cosmic Radiation & Asteroid 2008 TC3:
> http://adsabs.harvard.edu/abs/2010LPI....41.2256W
> High Porosity and Cosmic-Ray Exposure Age of Asteroid 2008
> TC3 Derived from Cosmogenic Nuclides
> Cosmogenic radionuclides in the Almahata Sitta ureilite,
> combined with measured size of 28 m3, indicate that asteroid
> 2008 TC3 had a density of 1.5 g/cm3 and a porosity of 55%.
> Cosmogenic noble gas concentrations indicate a cosmic-ray
> exposure age of 15 Myr.
> 
> Given all this, how old are asteroids, really?
> 
> Regards,
> Eric Wichman
> Meteorites USA
> 
> P.S. This is of course related (if however loosely) to my
> "dumb" question about the Wethersfield meteorites and the
> possibility of them being from the same parent body.
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Received on Sun 07 Mar 2010 11:29:40 PM PST