Difference between revisions of "October 17, 2014"
| (2 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
__NOTOC__ | __NOTOC__ | ||
=Seeing Into the Dark= | =Seeing Into the Dark= | ||
| + | <!-- Start of content --> | ||
<!-- ws:start:WikiTextHeadingRule:0:<h1> --> | <!-- ws:start:WikiTextHeadingRule:0:<h1> --> | ||
<!-- ws:start:WikiTextLocalImageRule:6:<img src="/file/view/LPOD-Oct17-14.jpg/526857224/LPOD-Oct17-14.jpg" alt="" title="" /> -->[[File:LPOD-Oct17-14.jpg|LPOD-Oct17-14.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br /> | <!-- ws:start:WikiTextLocalImageRule:6:<img src="/file/view/LPOD-Oct17-14.jpg/526857224/LPOD-Oct17-14.jpg" alt="" title="" /> -->[[File:LPOD-Oct17-14.jpg|LPOD-Oct17-14.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br /> | ||
<em>Kandinksky crater image from [http://messenger.jhuapl.edu/gallery/sciencePhotos/image.php?image_id=1484 MESSENGER Image Team]</em><br /> | <em>Kandinksky crater image from [http://messenger.jhuapl.edu/gallery/sciencePhotos/image.php?image_id=1484 MESSENGER Image Team]</em><br /> | ||
<br /> | <br /> | ||
| − | LPOD contributors have [http://lpod. | + | LPOD contributors have [http://www2.lpod.org/wiki/August_6,_2014 imaged] the central peaks of craters hidden by shadows using light scattered by the illuminated crater rims. The Kaguya spacecraft did the same to [http://www2.lpod.org/wiki/October_24,_2008 image] the floor of the Moon's Shackleton crater, and now MESSENGER scientists have applied the technique to investigate the shadowed floors of Mercurian polar craters that are known to contain ice. In the image pair above a normal exposure (left) shows the bright rim of 60 km wide Kandinsky crater, located at 89° N, whose interior is permanently shadowed. Using a longer exposure and extreme image processing the area surrounding the crater is saturated, but the floor of the crater is clearly visible (right). The reason this works is the high sensitivity of the MESSENGER MDIS camera. Only one amateur [http://www2.lpod.org/wiki/September_13,_2012 image] that I am aware of reveals features of the shadowed floor of a lunar crater. Is it possible that instead of using a planetary camera made for imaging of relatively bright objects, that use of a camera designed for long exposure imaging of faint nebulae will make it easier to see into the darkness of lunar craters?<br /> |
<br /> | <br /> | ||
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
| Line 16: | Line 17: | ||
<p><b>Tomorrow's LPOD:</b> [[October 18, 2014|Big Plain]] </p> | <p><b>Tomorrow's LPOD:</b> [[October 18, 2014|Big Plain]] </p> | ||
<hr /> | <hr /> | ||
| + | {{wiki/ArticleFooter}} | ||
Latest revision as of 07:35, 28 October 2018
Seeing Into the Dark
Kandinksky crater image from MESSENGER Image Team
LPOD contributors have imaged the central peaks of craters hidden by shadows using light scattered by the illuminated crater rims. The Kaguya spacecraft did the same to image the floor of the Moon's Shackleton crater, and now MESSENGER scientists have applied the technique to investigate the shadowed floors of Mercurian polar craters that are known to contain ice. In the image pair above a normal exposure (left) shows the bright rim of 60 km wide Kandinsky crater, located at 89° N, whose interior is permanently shadowed. Using a longer exposure and extreme image processing the area surrounding the crater is saturated, but the floor of the crater is clearly visible (right). The reason this works is the high sensitivity of the MESSENGER MDIS camera. Only one amateur image that I am aware of reveals features of the shadowed floor of a lunar crater. Is it possible that instead of using a planetary camera made for imaging of relatively bright objects, that use of a camera designed for long exposure imaging of faint nebulae will make it easier to see into the darkness of lunar craters?
Chuck Wood
Related Links
Nancy L. Chabot and colleagues (2014). Images of surface volatiles in Mercury’s polar craters acquired by the MESSENGER spacecraft. Geology. (full article)
Yesterday's LPOD: Two Lunar Brothers
Tomorrow's LPOD: Big Plain
COMMENTS?
Register, Log in, and join in the comments.
