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 <[email protected]> wrote: > From: E.P. Grondine <[email protected]> > Subject: [meteorite-list] Limits of Carbonaceous Chondrite observability from > Earth > To: [email protected] > 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 > > > > > > > > > ______________________________________________ > http://www.meteoritecentral.com > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
