Slika:Janus - Voyager 2.jpg

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Povzetek

Opis
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
Vir http://solarviews.com/cap/sat/janus5.htm (image link)
Avtor NASA (Voyager 2 mission)/Calvin J. Hamilton

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Public domain Ta datoteka je v javni domeni, ker jo je izdelala izključno NASA. Avtorskopravna politika NASE pravi, da »Gradivo NASE ni zaščiteno z avtorskimi pravicami, razen če je rečeno drugače.« (glej Template:PD-USGov, stran z avtorskopravno politiko NASE ali Politiko uporabe slik JPL.)
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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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Datum in časSličicaVelikostUporabnikKomentar
trenutno00:41, 22. julij 2019Sličica za različico z datumom 00:41, 22. julij 2019250 × 250 (8 KB)BevinKaconReverted to version as of 11:02, 15 November 2007 (UTC) no improvements since original upload
10:51, 5. maj 2015Sličica za različico z datumom 10:51, 5. maj 2015248 × 253 (14 KB)Jcpag2012larger, re-cropped
08:31, 29. marec 2015Sličica za različico z datumom 08:31, 29. marec 2015250 × 250 (8 KB)Jcpag2012Reverted to version as of 11:02, 15 November 2007
04:27, 26. marec 2015Sličica za različico z datumom 04:27, 26. marec 2015250 × 250 (8 KB)HuntsterReverted to version as of 11:02, 15 November 2007; unnecessary and inappropriate upsampling.
10:30, 24. februar 2015Sličica za različico z datumom 10:30, 24. februar 20151.000 × 1.072 (319 KB)Jcpag2012processing with Paint.NET
13:02, 15. november 2007Sličica za različico z datumom 13:02, 15. november 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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