RE: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
My OWN guess (SWAGS are allowed/encouraged here!) is a dual impact at the exact same time with the impactors closely aligned - perhaps even touching or loosely bound. Ejecta is squeezed out and a wall is formed at the intersection of the two craters' point of outer wall intersection . Messier A B on the moon are thought to be dual impactors but they are spread apart a bit. Fascinating as Spock would say. Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Greg Redfern Sent: Saturday, July 16, 2005 10:33 AM To: Meteorite Mailing List Subject: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005 Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. To remove yourself from all mailings from NASA Jet Propulsion Labratory, please go to http://www.kintera.org/TR.asp?ID=M69947285956903916642665 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
Just a guess but... Twin impact, a meteorite that broke in two parts during impact or short ahead. Maybe it was two loosely attached bodies that fell or a broken body. Anyhow, they should have been really close in mass to create such a perfect twin crater and the two plumes of ejecta. The nice rim in the middle and the plumes could only be formed if the two craters were formed at the same time. If this could form, then there should be a whole range of twin craters with different size craters and the ejecta plumes in different angles. /Göran Greg Redfern wrote: Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
Hi Pete, THEMIS images are taken in the infrared portion of the spectrum see the link at the bottom for more information on THEMIS and Mars Odyssey. Your guess is similar to mine - I hope the List's best and brightest give it a whirl too. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dippl Family Sent: Saturday, July 16, 2005 10:42 AM To: meteorite-list@meteoritecentral.com Subject: Fw: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005 Is this a negative image? If so it could be two(or a split) impacting bodies striking at the same time close together with the resulting ejecta plumes from the interference boundary zone between them. Cheers Pete Dippl - Original Message - From: Greg Redfern [EMAIL PROTECTED] To: Meteorite Mailing List meteorite-list@meteoritecentral.com Sent: Sunday, July 17, 2005 12:02 AM Subject: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005 Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. To remove yourself from all mailings from NASA Jet Propulsion Labratory, please go to http://www.kintera.org/TR.asp?ID=M69947285956903916642665 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
As the craters are so much bigger than the impactors, the twin impactors couldn't be touching but have to be separated before impact. The point where they hit must be in the center of the craters. Really nice pictures, thanks for the link. /Göran Greg Redfern wrote: My OWN guess (SWAGS are allowed/encouraged here!) is a dual impact at the exact same time with the impactors closely aligned - perhaps even touching or loosely bound. Ejecta is squeezed out and a wall is formed at the intersection of the two craters' point of outer wall intersection . Messier A B on the moon are thought to be dual impactors but they are spread apart a bit. Fascinating as Spock would say. Greg Redfern __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
Hi Goran, My SWAG is similar to yours and Pete's. What is really interesting is the alignment and constraint of the ejecta along one axis. It would seem that the ejecta was confined to this alignment due to the intersecting ejecta plumes and not allowed to spread. Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Göran Axelsson Sent: Saturday, July 16, 2005 10:56 AM To: meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005 Just a guess but... Twin impact, a meteorite that broke in two parts during impact or short ahead. Maybe it was two loosely attached bodies that fell or a broken body. Anyhow, they should have been really close in mass to create such a perfect twin crater and the two plumes of ejecta. The nice rim in the middle and the plumes could only be formed if the two craters were formed at the same time. If this could form, then there should be a whole range of twin craters with different size craters and the ejecta plumes in different angles. /Göran Greg Redfern wrote: Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
I didn't see what everyone else said, but to me it has to be the result of the simultaneous impact of two impactors. The material thrown out perpendicular to a line between the centers of the two craters would be due to the overlapping/disrupting shock waves. If the two craters formed at different times then the ejecta from one would just overlay the older crater. Great pic! Cheers, MDF Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. To remove yourself from all mailings from NASA Jet Propulsion Labratory, please go to http://www.kintera.org/TR.asp?ID=M69947285956903916642665 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list -- Marc Fries Postdoctoral Research Associate Carnegie Institution of Washington Geophysical Laboratory 5251 Broad Branch Rd. NW Washington, DC 20015 PH: 202 478 7970 FAX: 202 478 8901 - I urge you to show your support to American servicemen and servicewomen currently serving in harm's way by donating items they personally request at: http://www.anysoldier.com (This is not an endorsement by the Geophysical Laboratory or the Carnegie Institution.) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
Greg, I think NASA should name it the Dolly Parton Impact Crater. :) -- Original message from Greg Redfern [EMAIL PROTECTED]: -- My OWN guess (SWAGS are allowed/encouraged here!) is a dual impact at the exact same time with the impactors closely aligned - perhaps even touching or loosely bound. Ejecta is squeezed out and a wall is formed at the intersection of the two craters' point of outer wall intersection . Messier A B on the moon are thought to be dual impactors but they are spread apart a bit. Fascinating as Spock would say. Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Greg Redfern Sent: Saturday, July 16, 2005 10:33 AM To: Meteorite Mailing List Subject: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005 Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. To remove yourself from all mailings from NASA Jet Propulsion Labratory, please go to http://www.kintera.org/TR.asp?ID=M69947285956903916642665 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
Hi, Everybody seems to agree on twin impactors. Twin impactors are no mystery. Many binary asteroids have been identified. There are large asteroids with much smaller moons of their own (like Ida and Dactyl) and asteroids where the two bodies are very similar in size size, including very close binaries, even ones where it is possible that the two bodies are actually touching each other as they revolve around each other. Contact binaries, they're called. They are a small minority of asteroids, of course, but there have been a good number identified. I would think a contact binary would be a good candidate for the origin of these two similarly sized joint craters. I was impressed at how clean and fresh these craters look, the one on the right particularly. They cannot be very ancient, despite the signs of a few small impacts on their inner walls.. They retain their deep conical shape, the shape of the blast cone, a characteristic mark of a fresh crater. There is little debris accumulated on their floors, and their inner walls are remarkably uneroded and uniform. I see no reference as to their size on the page, but I get the impression that they are bigger than, for example, Arizona's Meteor Crater, perhaps 1 to 3 miles in diameter (each). The left impactor seems to have been the smaller of the two, and the triangular shadow in the left crater seems to indicate that the left rim of that crater is elevated to a peak at the far side. Binaries, no doubt. Sterling K. Webb - Marc Fries wrote: I didn't see what everyone else said, but to me it has to be the result of the simultaneous impact of two impactors. The material thrown out perpendicular to a line between the centers of the two craters would be due to the overlapping/disrupting shock waves. If the two craters formed at different times then the ejecta from one would just overlay the older crater. Great pic! Cheers, MDF Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. To remove yourself from all mailings from NASA Jet Propulsion Labratory, please go to http://www.kintera.org/TR.asp?ID=M69947285956903916642665 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list -- Marc Fries Postdoctoral Research Associate Carnegie Institution of Washington Geophysical Laboratory 5251 Broad Branch Rd. NW Washington, DC 20015 PH: 202 478 7970 FAX: 202 478 8901 - I urge you to show your support to American servicemen and servicewomen currently serving in harm's way by donating items they personally request at: http://www.anysoldier.com (This is not an endorsement by the Geophysical Laboratory or the Carnegie Institution.) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
RE: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005
My thanks to everyone for some great SWAGGING on the list = this is what it is for. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sterling K. Webb Sent: Saturday, July 16, 2005 11:35 PM To: Meteorite Mailing List Subject: Re: [meteorite-list] FW: Mars Odyssey THEMIS Images: July 11-15, 2005 Hi, Everybody seems to agree on twin impactors. Twin impactors are no mystery. Many binary asteroids have been identified. There are large asteroids with much smaller moons of their own (like Ida and Dactyl) and asteroids where the two bodies are very similar in size size, including very close binaries, even ones where it is possible that the two bodies are actually touching each other as they revolve around each other. Contact binaries, they're called. They are a small minority of asteroids, of course, but there have been a good number identified. I would think a contact binary would be a good candidate for the origin of these two similarly sized joint craters. I was impressed at how clean and fresh these craters look, the one on the right particularly. They cannot be very ancient, despite the signs of a few small impacts on their inner walls.. They retain their deep conical shape, the shape of the blast cone, a characteristic mark of a fresh crater. There is little debris accumulated on their floors, and their inner walls are remarkably uneroded and uniform. I see no reference as to their size on the page, but I get the impression that they are bigger than, for example, Arizona's Meteor Crater, perhaps 1 to 3 miles in diameter (each). The left impactor seems to have been the smaller of the two, and the triangular shadow in the left crater seems to indicate that the left rim of that crater is elevated to a peak at the far side. Binaries, no doubt. Sterling K. Webb - Marc Fries wrote: I didn't see what everyone else said, but to me it has to be the result of the simultaneous impact of two impactors. The material thrown out perpendicular to a line between the centers of the two craters would be due to the overlapping/disrupting shock waves. If the two craters formed at different times then the ejecta from one would just overlay the older crater. Great pic! Cheers, MDF Hello List, Any ideas as to what went on here? Check #60 - one of the MOST unusual crater formations I have ever seen. All the best, Greg Greg Redfern NASA JPL Solar System Ambassador http://www2.jpl.nasa.gov/ambassador/index.html What's Up: The Space Place http://www.wtopnews.com/index.php?nid=421 o THEMIS Images as Art #60 (Released 15 July 2005) http://themis.la.asu.edu/zoom-20050715A.html All of the THEMIS images are archived here: http://themis.la.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. To remove yourself from all mailings from NASA Jet Propulsion Labratory, please go to http://www.kintera.org/TR.asp?ID=M69947285956903916642665 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list -- Marc Fries Postdoctoral Research Associate Carnegie Institution of Washington Geophysical Laboratory 5251 Broad Branch Rd. NW Washington, DC 20015 PH: 202 478 7970 FAX: 202 478 8901 - I urge you to show your support to American servicemen and servicewomen currently serving in harm's way by donating items they personally request at: http://www.anysoldier.com (This is not an endorsement by the Geophysical Laboratory or the Carnegie Institution.) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http
