You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Observing >> Lunar Observing Previous   Index   Next   Threaded   Pages: 1 revans scholastic sledgehammer Reged: 09/26/05 Posts: 810 Loc: Fitchburg, MA banded crater question       #2543809 - 07/27/08 09:00 AM Edit   Reply   Quote Quick Reply   A banded crater is a crater with alternating stripes of light and dark material running around its walls (like Aristarchus under high lighting conditions) giving a spoke wheel appearance. There are probably a couple of hundred craters showing at least a hint of this on the moon. Does anyone know if this banding has been reproduced when impact craters are created experimentally? I am interested in how the bands are created... maybe in some cases by the impact itself and in other cases by subsequent landslides?? Rick -------------------- Rick Evans http://www.freewebs.com/revans_01420/ Post Extras:       photonovore Moonatic Reged: 12/24/04 Posts: 2471 Loc: tacoma wa Re: banded crater question [Re: revans]       #2550663 - 07/30/08 03:33 PM Edit   Reply   Quote Quick Reply   Landslides, Rick. Take a look herefor Chuck's explanation. -------------------- Mardi AR-5 ldx75 refractor, 80mm f/11 refractor, 6" eq3 RFT, ETX-70. Whitepeak Lunar Observatory Website Post Extras:       revans scholastic sledgehammer Reged: 09/26/05 Posts: 810 Loc: Fitchburg, MA Re: banded crater question [Re: photonovore]       #2550788 - 07/30/08 04:33 PM Edit   Reply   Quote Quick Reply   Mardi, Yes, I think Chuck's explanation makes a lot of sense... especially for craters like Aristarchus. There are some other craters, though, like Dionysius where really dark banding is present and is explained as being due to the asteroid going through more than one layer of lunar material (in the case of Dionysius the other layer is a basalt). The Clementine natural color image of Dionysius is pretty impressive. I wonder also if a crater had two layers... one of anorthosite (white) and a second of norite (greyish)... if an asteroid would produce a banded crater impacting such terrain? Rick -------------------- Rick Evans http://www.freewebs.com/revans_01420/ Post Extras:       photonovore Moonatic Reged: 12/24/04 Posts: 2471 Loc: tacoma wa Re: banded crater question [Re: revans]       #2551729 - 07/31/08 01:39 AM Edit   Reply   Quote Quick Reply   Yep, an impact through a couple different layers of lava could certainly throw up some entertaining patterns! After all, just a casual look at Mare Serenitatis shows how different in albedo adjacent layers can be. Dionysius indeed seems to lie right on a borderland between light Cayley highland material and dark mare basalt as you say, so that could certainly account for some contribution to the varied albedo this crater shows-- i would think... -------------------- Mardi AR-5 ldx75 refractor, 80mm f/11 refractor, 6" eq3 RFT, ETX-70. Whitepeak Lunar Observatory Website Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 1 registered and 3 anonymous users are browsing this forum. Moderator:  desertstars  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 218 Jump to *International Year of Astronomy 2009* -----   Global Coordination   Cornerstone Projects   Special Projects   Special Task Groups   Global Activities   National and Regional Activities   IYA 2009 in Africa   IYA 2009 in the USA*Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Beginners Forum   Celestial Events   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Celestron SkyScout and Meade mySky   Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   General Observing   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Other* -----   Science of Astronomy & Space exploration   AstroWebsites   Space Rocks*Speciality Forums* -----   AstroArt   Astronomy Software & Computers   Stellar Media   Astro Outreach, Clubs and Star Parties*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements Home

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