File:Asteroid 1999 JD6 - PIA19646.gif
Asteroid_1999_JD6_-_PIA19646.gif (512 × 256 pixels, file size: 2.9 MB, MIME type: image/gif, looped, 90 frames, 9.0 s)
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Summary[edit]
DescriptionAsteroid 1999 JD6 - PIA19646.gif |
English: In this video, created from of radar images of near-Earth asteroid 1999 JD6 was collected by NASA scientists on July 25, 2015. The images show the rotation of the asteroid, which made its closest approach on July 24 at 9:55 p.m. PDT (12:55 a.m. EDT on July 25) at a distance of about 4.5 million miles (7.2 million kilometers, or about 19 times the distance from Earth to the moon).
The asteroid appears to be a contact binary -- an asteroid with two lobes that are stuck together. The radar images show the asteroid is highly elongated, with a length of approximately 1.2 miles (2 kilometers) on its long axis. These images are radar echoes, which are more like a sonogram than a photograph. The views were obtained by pairing NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, California, with the 330-foot (100-meter) National Science Foundation Green Bank Telescope in West Virginia. Using this approach, the Goldstone antenna beams a radar signal at an asteroid and Green Bank receives the reflections. The technique, referred to as a bistatic observation, dramatically improves the amount of detail that can be seen in radar images. The new views obtained with the technique show features as small as about 25 feet (7.5 meters) wide. |
Date | |
Source | https://photojournal.jpl.nasa.gov/catalog/PIA19646 |
Author | NASA/JPL-Caltech/NRAO |
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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.) | ||
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current | 03:55, 23 January 2020 | 512 × 256 (2.9 MB) | Nrco0e (talk | contribs) | User created page with UploadWizard |
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