[meteorite-list] Limits of Carbonaceous Chondrite observability from Earth

From: Richard Kowalski <damoclid_at_meteoritecentral.com>
Date: Sun, 6 Sep 2009 13:01:16 -0700 (PDT)
Message-ID: <3628.16605.qm_at_web33906.mail.mud.yahoo.com>

Carbonaceous Chondrites usually run between 5% - 10% albedo

http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1996.pdf

2008 TC3, an approximately 5 meter diameter object, was about 515,000 km (~320,000 miles) away at discovery. Its albedo was ~5% and it was at 19.0V magnitude when discovered. Easily visible with our Schmidt, and rather bright for the 1.5-meter (G96). Two days earlier it was ~1.8 million km (~1.2 million miles) out and was near the threshold of detectability for G96, 22.0V, using our nominal survey exposure of 30 seconds.

I checked my documentation from the 2006 DPS meeting but I don't have even the abstract for the NEO-VIS poster, so you might want to contact the authors, cited in the link I sent in an earlier email.

I can't answer your last question.

--
Richard Kowalski
http://fullmoonphotography.net
IMCA #1081
--- On Sun, 9/6/09, E.P. Grondine <epgrondine at yahoo.com> wrote:
> From: E.P. Grondine <epgrondine at yahoo.com>
> Subject: [meteorite-list] Limits of Carbonaceous Chondrite observability from Earth
> To: meteorite-list at meteoritecentral.com
> Date: Sunday, September 6, 2009, 12:12 PM
> Hello everyone - 
> 
> I have a problem to work and I'd like your input. 
> 
> I think that the current analysis is that a 30-60 (more
> likely 60 in my guess) comet fragment hit at Tunguska in
> 1908.
> 
> We know the luminence (reflectivity) of carbonaceous
> chondrites. 
> Carbonaceous chondrites are usually thought to be cometary
> in origin. 
> 
> Assuming no multiple passes (in other words following a
> long or short period comet orbit), what are the limits on
> Earth based observability of dead (not outgasssing) comet
> fragments? 
> 
> Size, range, and travel time to Earth estimates, please. 
> 
> Does anyone here know the observational limits of the
> proposed NEO-VIS orbiting telescope?
> 
> Finally, a few years back the CAPS (Comet and Asteroid
> Protection System) proposed using an active Moon based LIDAR
> for dead comet fragment detection. 
> 
> Does anyone know what happened to that study?
> 
> E.P. Grondine
> Man and Impact in the Americas
> 
> 
> 
> 
> 
> 
> 
> ? ? ? 
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Received on Sun 06 Sep 2009 04:01:16 PM PDT