File:PIA02142 Tempel 1 bottom sharped.jpg
Original file (1,600 × 1,600 pixels, file size: 420 KB, MIME type: image/jpeg)
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Summary
DescriptionPIA02142 Tempel 1 bottom sharped.jpg |
This image shows comet Tempel 1 before Deep Impact's probe smashed into its surface. It is a composite of images taken by the probe's impactor targeting sensor. The Sun is to the right of the image and reveals terrain varying in brightness by a factor of two. Shadows and bright areas indicate surface topography. Smooth regions with no features (lower left and upper right) are probably younger than rougher areas with circular features, which are probably impact craters. The probe crashed between the two dark-rimmed craters near the center and bottom of the comet. The comet nucleus is estimated to be about 5 kilometers (3.1 miles) across and 7 (4.3 miles) kilometers tall. This composite image was built up from scaling all images to 5 meters/pixel, and aligning images to fixed points. Each image at closer range, replaced equivalent locations observed at a greater distance. The impact site has the highest resolution because images were acquired until about 4 sec from impact or a few meters from the surface. In the annotated version (see "Other versions" below), arrows a and b point to large, smooth regions. The impact site is indicated by the third large arrow. Small arrows highlight a scarp that is bright due to illumination angle, which shows the smooth area to be elevated above the extremely rough terrain. The scale bar is 1 km and the two arrows above the nucleus point to the sun and the rotational axis of the nucleus. Celestial north is near the rotational pole. The original NASA image has been modified by cropping, and by sharpening of the lower 640 pixels. |
Date | |
Source | http://photojournal.jpl.nasa.gov/catalog/PIA02142 |
Author | NASA / Jet Propulsion Laboratory / University of Maryland |
Other versions | File:PIA02142 annotated.jpg - annotated version |
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA02142. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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Licensing
Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
Warnings:
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Items portrayed in this file
depicts
4 July 2005
File history
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Date/Time | Dimensions | User | Comment | |
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current | 11:52, 21 February 2011 | 1,600 × 1,600 (420 KB) | WolfmanSF | Reduce sharpened area to bottom 640 pixels, and reduce radius of sharpening to 0.4 pixels. |
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Metadata
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If the file has been modified from its original state, some details may not fully reflect the modified file.
Image title | converted PNM file |
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Width | 1,600 px |
Height | 1,600 px |
Bits per component | 8 |
Compression scheme | Uncompressed |
Pixel composition | Black and white (Black is 0) |
Orientation | Normal |
Number of components | 1 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 6.0 Macintosh |
File change date and time | 10:36, 21 February 2011 |
Color space | Uncalibrated |