File:S2007 S 4 PIA08369.gif
S2007_S_4_PIA08369.gif (700 × 450像素,文件大小:695 KB,MIME类型:image/gif、循环、9帧、9.0秒)
说明
摘要[编辑]
描述S2007 S 4 PIA08369.gif | Animated GIF of discovery images of Saturnian moon S/2007 S 4 | ||
日期 | |||
来源 |
http://photojournal.jpl.nasa.gov/catalog/PIA08369
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作者 | NASA/JPL/Space Science Institute | ||
其他版本 | still image |
Original Caption Released with Image:
The 60th moon of Saturn reveals itself in a sequence of images. The discovery suggests that the new moon, along with its neighbors Methone and Pallene (discovered by the Cassini imaging team in 2004), may form part of a larger group of moons in this region. The movie spans six hours.
Initial calculations show the moon to have a width of approximately 2 kilometers (1.2 miles), with an orbit that lies between those of the moons Methone and Pallene. The moon's orbit is in resonance with another moon, Mimas, also seen in this sequence as a very bright, moving object. The new moon's location is indicated by a red box.
The (narrow) ring visible in the images is the G ring, and the G ring arc passes through the field of view during the course of the movie. Calypso, a Trojan moon of Tethys, is also visible in the sequence. Trojan moons are found near gravitationally stable points ahead or behind a larger moon.
This view looks toward the non-illuminated side of the rings from about 3 degrees above the ringplane.
The series of images was taken in visible light with the Cassini spacecraft wide-angle camera on May 30, 2007, at a distance of approximately 1.76 million kilometers (1.09 million miles) from Saturn. Image scale is about 105 kilometers (65 miles) per pixel. The ghostly shape that stretches across the scene results from scattered light within the camera optics.
许可协议[编辑]
Public domainPublic domainfalsefalse |
本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ||
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当前 | 2008年2月26日 (二) 08:35 | 700 × 450(695 KB) | Kwamikagami(留言 | 贡献) | {{Information |Description=Animated GIF of discovery images of Saturnian moon S/2007 S 4 |Source=NASA |Date=2007 May 30 |Author=NASA/JPL/Space Science Institute |Permission=public domain }} Original Caption Released with Image: The 60th moon of Saturn |
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