tóng-àn:Janus - Voyager 2.jpg

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Janus_-_Voyager_2.jpg ‎（250 × 250 siōng-sò͘ , tóng-àn chiàm-liōng: 8 KB, MIME luī-hêng: image/jpeg）

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Khài-iàu

Soat-bêngJanus - 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.
Ji̍t-kî	1981年8-goe̍h25日
Chhut-chhù	http://solarviews.com/cap/sat/janus5.htm (image link)
Chok-chiá	NASA (Voyager 2 mission)/Calvin J. Hamilton

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(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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hiān-chāi	2019-nî 7-goe̍h 21-ji̍t (lé-pài) 22:41	250 × 250（8 KB）	BevinKacon	Reverted to version as of 11:02, 15 November 2007 (UTC) no improvements since original upload
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