[meteorite-list] Very cool Impact Crater on Mars

From: Meteoriteshow <meteoriteshow_at_meteoritecentral.com>
Date: Sat Jan 7 08:53:08 2006
Message-ID: <01b301c61391$ae4b1660$0400a8c0_at_IBM>

Thanks Pete, it's really amazing!
Fred B

----- Original Message -----
From: "Pete Pete" <rsvp321_at_hotmail.com>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Saturday, January 07, 2006 12:34 AM
Subject: [meteorite-list] Very cool Impact Crater on Mars


> Amazing hi-res pictures at the source site:
>
> http://www.esa.int/SPECIALS/Mars_Express/SEMZLM8A9HE_0.html
>
> http://www.esa.int/SPECIALS/Mars_Express/SEMZLM8A9HE_0.html
>
> News
>
> 'Butterfly' impact crater in Hesperia Planum
>
>
>
> Colour view of 'butterfly'-shaped crater at Hesperia Planum
>
> 4 January 2006
> These images, taken by the High Resolution Stereo Camera (HRSC) on board
> ESA's Mars Express spacecraft, show a large elliptical impact crater in the
> Hesperia Planum region of Mars.
>
>
> Map showing 'butterfly' crater in context
> The HRSC obtained these images during orbit 368 with a ground resolution of
> approximately 16.7 metres per pixel. The scenes show the region of Hesperia
> Planum, at approximately 35.3? South and 118.7? East.
> A large elliptical impact crater is visible within the scene, measuring
> approximately 24.4 km long, 11.2 km wide and reaching a maximum depth of
> approximately 650 metres below the surrounding plains.
>
>
> Black and white nadir view of Hesperia Planum
> Ejecta from this impact can be seen extending away from the crater,
> including two prominent lobes of material north-west and south-east of the
> crater.
>
> The large circular feature, partly cut off by the border of the image, has a
> diameter of roughly 45 km.
>
> This appears to be an impact crater that was subsequently resurfaced by lava
> flows, preserving the outline of the underlying crater. The curving features
> visible in the north of the image, known as 'wrinkle ridges', are caused by
> compressional tectonics.
>
>
> Close-up perspective view of 'butterfly' crater - looking north
> While the majority of impact craters are relatively circular, the elliptical
> shape of this impact crater suggests a very low impact angle (less than 10
> degrees).
>
> The long axis of the impact crater is viewed as the impacting direction of
> the projectile. Similar elliptical craters are observed elsewhere on Mars,
> as well as on our Moon.
>
> The colour scenes have been derived from the three HRSC-colour channels and
> the nadir channel. The perspective views have been calculated from the
> digital terrain model derived from the stereo channels.
>
> 3D anaglyph view of Hesperia Planum
> The 3D anaglyph image was calculated from the nadir and one stereo channel.
> Image resolution has been decreased for use on the internet.
>
> For more information on Mars Express HRSC images, you might like to read our
> updated 'Frequently Asked Questions'.
>
>
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Received on Sat 07 Jan 2006 08:53:03 AM PST