File:Mars and Comet Siding Spring.jpg
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DescriptionMars and Comet Siding Spring.jpg |
English: This composite Hubble Space Telescope image captures the positions of Comet Siding Spring (C/2013 A1) and Mars in a never-before-seen close passage of a comet by the Red Planet, which happened at 2:28 p.m. EDT October 19, 2014. On that date the comet passed by Mars at approximately 87,000 miles (about one-third the distance between Earth and the Moon).
The Mars and comet images have been added together to create a single picture to illustrate the angular separation between the comet and Mars at closest approach. This is a composite image because a single exposure of the stellar background, Comet Siding Spring, and Mars would be problematic. Mars is actually 10,000 times brighter than the comet, and so could not be properly exposed to show detail in the Red Planet. The comet and Mars were also moving with respect to each other and so could not be imaged simultaneously in one exposure without one of the objects being motion blurred. Hubble had to be programmed to track on the comet and Mars separately in two different observations. The background starfield in this composite image is synthesized from ground-based telescope data provided by the Palomar Digital Sky Survey, which has been reprocessed to approximate Hubble's resolution. For more information, visit: hubblesite.org/news_release/news/2014-45/82 Credit: NASA, ESA, J.-Y. Li (PSI), C.M. Lisse (JHU/APL), and the Hubble Heritage Team (STScI/AURA) |
Date | |
Source | https://www.flickr.com/photos/144614754@N02/32775100378/ |
Author | NASA Hubble |
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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/32775100378 (archive). It was reviewed on 26 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 February 2020
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JPEG file comment | This illustration — created for a NASA press release — combines data from the NASA/ESA Hubble Space Telescope of Comet Siding Spring and separate Hubble data of Mars. On 19 October 2014 — the day that the images of both Mars and the comet were taken — at 20:28 CEST, the comet passed within only 140 000 kilometres of the red planet — roughly a third the distance between the Earth and the Moon. At that time the comet and Mars were almost 250 million kilometres from Earth. This flyby of Comet Siding Spring is the closest encounter of a comet with a planet ever observed! The background starfield, which has been added to this image, is synthesised from ground-based telescope data Links: NASA press release |
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