Re: [meteorite-list] Chondrule close up!
Folks! There is only one word to say: WOW This chondrule is so awesome, if you don't have seen this fantastic chondrule till now, you should write Tom a short note. It's a truly must see. Don't hesitate... Best wishes and a special THANKS to Tom Ingo -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von [EMAIL PROTECTED] Gesendet: Freitag, 18. April 2008 06:05 An: meteorite-list@meteoritecentral.com Betreff: [meteorite-list] Chondrule close up! Hi chondrule fan list members, I wanted to share some micrographs of a chondrule. The material is no big deal. (It is pending but it looks like it will be L4/5.) A chondrule? You have got to see these shots. They were taken in incident (reflected) cross polarized light which, unlike transmitted Xpol, is true color. Just what it looks like up close. My first love in meteorite microscope examination! No thin section, just a hand sample polished to 1/4 micron. I have 5 images that I can put in an email (nothing to down load). If you like chondrules, you will want to see this one. I have done this before and I am up to nothing. I am not harvesting email addresses! It may be some time before classification is complete and I won't post images to the Gallery until it is named. Some of you have received email image files from me before, perhaps you could let the others know I am just sharing some cool shots and nothing more! Tom Phillips, starsinthedirt **Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos. (http://autos.aol.com/used?NCID=aolcmp0030002851) __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Chondrule close up!
On Fri, 18 Apr 2008 23:11:58 +0200, you wrote: Folks! There is only one word to say: WOW This chondrule is so awesome, if you don't have seen this fantastic chondrule till now, you should write Tom a short note. It's a truly must see. Agreed, amazing chondrule-- in fact, it is a chon-drool. Meanwhile, chondrule far away!: http://media.skyandtelescope.com/images/Ceres_f.jpg __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Chondrule close up!
., Taylor, R.C., Drummond, J., Harwood, D., Nickoloff, I., Scaltriti, F., Schober, H. J., Zappala, V., 1983. Icarus 54, 23-29] in terms of magnitude, amplitude, and shape. The 0.04 magnitude lightcurve amplitude cannot be matched by Ceres' rotationally symmetric shape, and is modeled here by albedo patterns. The geometric albedos at the above three wavelengths are measured to be 0.087 ± 0.003, 0.056 ± 0.002, and 0.039 ± 0.003, respectively. V-band geometric albedo is calculated to be 0.090 ± 0.003, consistent with earlier observations [Tedesco, E.F., 1989. In: Binzel, R.P., Gehrels, T., Matthews, M.S. (Eds.), Asteroids II. Univ. of Arizona Press, Tucson, pp. 1090-1138]. A strong absorption band (30%) centered at about 280 nm is observed, but cannot be identified with either laboratory UV spectra or the spectra of Europa or Ganymede. The single-scattering albedo has been modeled to be 0.070 ± 0.002, 0.046 ± 0.002, and 0.032 ± 0.003, respectively. The photometric roughness of Ceres' surface is found to be about 44° ± 5° from photometric modeling using Hapke's theory, consistent with earlier radar observations [Mitchell, D.L., Ostro, S.J., Hudson, R.S., Rosema, K.D., Campbell, D.B., Velez, R., Chandler, J. F., Shapiro, I.I, Giorgini, J.D., Yeomans, D.K., 1996. Icarus 124, 113-133]. The first spatially resolved surface albedo maps of Ceres at three wavelengths have been constructed from HST observations, as well as the corresponding color maps. Eleven surface albedo features are identified, ranging in scale from 40-350 km. Overall the range of these albedo and color variations is small compared to other asteroids and some icy satellites. And, pleasantly, one very strong spectral feature cannot be identified, so there's something else there... Always good. Maybe it's the tholins. Summarize this? Ceres has an active surface with a slow but ongoing hydrological cycle. It shows exposed rock that is eroded to what is (in effect) olivine sand. It snows there. At the equator at noon in the summer, it gets warm enough for liquid water to briefly exist before evaporating; it may have thin clouds. Blocks of icy crust get overturned, then eroded, creating landscape relief, or maybe it's all craters, or maybe it's both. The most of the (solid) surface is clay; there is something else an inch or so down, or a change in density, to mudstones, siltstones, or something else (?). There are organics on the surface with all the potential that implies. My last prediction? It's not going to look like any planetary surface we've already seen. It's going to be a whole new thing. Sterling K. Webb --- - Original Message - From: Darren Garrison [EMAIL PROTECTED] To: meteorite-list@meteoritecentral.com Sent: Friday, April 18, 2008 4:17 PM Subject: Re: [meteorite-list] Chondrule close up! On Fri, 18 Apr 2008 23:11:58 +0200, you wrote: Folks! There is only one word to say: WOW This chondrule is so awesome, if you don't have seen this fantastic chondrule till now, you should write Tom a short note. It's a truly must see. Agreed, amazing chondrule-- in fact, it is a chon-drool. Meanwhile, chondrule far away!: http://media.skyandtelescope.com/images/Ceres_f.jpg __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Chondrule close up!
Hi chondrule fan list members, I wanted to share some micrographs of a chondrule. The material is no big deal. (It is pending but it looks like it will be L4/5.) A chondrule? You have got to see these shots. They were taken in incident (reflected) cross polarized light which, unlike transmitted Xpol, is true color. Just what it looks like up close. My first love in meteorite microscope examination! No thin section, just a hand sample polished to 1/4 micron. I have 5 images that I can put in an email (nothing to down load). If you like chondrules, you will want to see this one. I have done this before and I am up to nothing. I am not harvesting email addresses! It may be some time before classification is complete and I won't post images to the Gallery until it is named. Some of you have received email image files from me before, perhaps you could let the others know I am just sharing some cool shots and nothing more! Tom Phillips, starsinthedirt **Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos. (http://autos.aol.com/used?NCID=aolcmp0030002851) __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
