Fichier:Janus - Voyager 2.jpg

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Janus_-_Voyager_2.jpg(250 × 250 Pixel, Fichiersgréisst: 8 KB, MIME-Typ: image/jpeg)

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Resumé

Beschreiwung
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.
Datum
Quell http://solarviews.com/cap/sat/janus5.htm (image link)
Auteur NASA (Voyager 2 mission)/Calvin J. Hamilton

Lizenz

Public domain Diese Datei ist gemeinfrei (public domain), da sie von der NASA erstellt worden ist. Die NASA-Urheberrechtsrichtlinie besagt, dass „NASA-Material nicht durch Urheberrecht geschützt ist, wenn es nicht anders angegeben ist“. (NASA-Urheberrechtsrichtlinie-Seite oder JPL Image Use Policy).
Warnung:

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  • 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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aktuell22:41, 21. Jul. 2019Miniaturbild fir d'Versioun vum 22:41, 21. Jul. 2019250 × 250 (8 KB)BevinKaconReverted to version as of 11:02, 15 November 2007 (UTC) no improvements since original upload
08:51, 5. Mee 2015Miniaturbild fir d'Versioun vum 08:51, 5. Mee 2015248 × 253 (14 KB)Jcpag2012larger, re-cropped
06:31, 29. Mäe. 2015Miniaturbild fir d'Versioun vum 06:31, 29. Mäe. 2015250 × 250 (8 KB)Jcpag2012Reverted to version as of 11:02, 15 November 2007
02:27, 26. Mäe. 2015Miniaturbild fir d'Versioun vum 02:27, 26. Mäe. 2015250 × 250 (8 KB)HuntsterReverted to version as of 11:02, 15 November 2007; unnecessary and inappropriate upsampling.
08:30, 24. Feb. 2015Miniaturbild fir d'Versioun vum 08:30, 24. Feb. 20151.000 × 1.072 (319 KB)Jcpag2012processing with Paint.NET
11:02, 15. Nov. 2007Miniaturbild fir d'Versioun vum 11:02, 15. Nov. 2007250 × 250 (8 KB)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

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