Файл:Janus - Voyager 2.jpg

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ОписаниеJanus - Voyager 2.jpg	English: This is a colorized version of the high-resolution Voyager 2 spacecraft image of Janus that was taken on 25 August 1981. Janus was discovered by Audouin Dollfus in 1966 and was named after the god of gates and doorways. It is depicted with two faces looking in opposite directions. Janus has an irregular shape with a size of 196x192x150 kilometers (122x119x93 miles) in diameter. It is heavily cratered with several craters 30 kilometers (19 miles) in diameter. The pervasive cratering indicates that its surface must be several billion years old. Janus and Epimetheus share the same orbit of 151,472 kilometers (94,125 miles) from Saturn's center or 91,000 kilometers (56,547 miles) above the cloud tops. They are only separated by about 50 kilometers (31 miles). As these two satellites approach each other they exchange a little momentum and trade orbits; the inner satellite becomes the outer and the outer moves to the inner position. This exchange happens about once every four years. Janus and Epimetheus may have formed from a disruption of a single parent to form co-orbital satellites. If this is the case, the disruption must have happened early in the history of the satellite system.
Дата	25 август 1981
Източник	http://solarviews.com/cap/sat/janus5.htm (image link)
Автор	NASA (Voyager 2 mission)/Calvin J. Hamilton

	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: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

(All user names refer to it.wikipedia)

2006-09-22 20:36 Alessio Rolleri 250×250×8 (7713 bytes) Giano ripreso dalla sonda Voyager 2 Fonte: http://solarsystem.nasa.gov/planets/images/inset-sat_janus-large.gif {{PD-NASA}}

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	Дата/Час	Размер	Потребител	Коментар
текуща	22:41, 21 юли 2019	250 × 250 (8 КБ)	BevinKacon	Reverted to version as of 11:02, 15 November 2007 (UTC) no improvements since original upload
	08:51, 5 май 2015	248 × 253 (14 КБ)	Jcpag2012	larger, re-cropped
	06:31, 29 март 2015	250 × 250 (8 КБ)	Jcpag2012	Reverted to version as of 11:02, 15 November 2007
	02:27, 26 март 2015	250 × 250 (8 КБ)	Huntster	Reverted to version as of 11:02, 15 November 2007; unnecessary and inappropriate upsampling.
	08:30, 24 февруари 2015	1000 × 1072 (319 КБ)	Jcpag2012	processing with Paint.NET
	11:02, 15 ноември 2007	250 × 250 (8 КБ)	File Upload Bot (Magnus Manske)	{{BotMoveToCommons\|it.wikipedia}} {{Information \|Description={{it\|Giano ripreso dalla sonda Voyager 2 Fonte: http://solarsystem.nasa.gov/planets/images/inset-sat_janus-large.gif}} \|Source=Originally from [http://it.wikipedia.org it.wikipedia]; descripti