跳转到内容

File:PIA10452 - Saturn A ring spiral density waves.jpg

页面内容不支持其他语言。
這個文件來自維基共享資源
维基百科,自由的百科全书

原始文件 (1,014 × 1,014像素,文件大小:273 KB,MIME类型:image/jpeg


摘要

描述
English: This high-resolution view shows incredible detail within a spiral density wave in Saturn's A ring.

A spiral density wave is a spiral-shaped massing of particles that tightly winds many times around the planet. These waves decrease in wavelength with increasing distance from the planet.

The wave that covers a broad strip across the center of the image is created by a gravitational resonance with the moon Janus. For every sixth orbit of the ring particles at this radius from Saturn, Janus makes five orbits, meaning that the moon is continually providing a gravitational kick to particles in this region of the rings.

A couple of the peaks in the broad Janus-created wave appear bunched together, possibly owing to Janus' orbit being changed when it swaps places with its co-orbital moon Epimetheus (see PIA08170).

This view looks toward the sunlit side of the rings from about 34 degrees below the ringplane.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on July 21, 2008. The view was acquired at a distance of approximately 170,000 kilometers (106,000 miles) from Saturn. Image scale is 669 meters (2,194 feet) per pixel.

The Cassini Equinox Mission is a joint United States and European endeavor. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini Equinox Mission visit http://ciclops.org, http://www.nasa.gov/cassini and http://saturn.jpl.nasa.gov.
日期
来源 http://www.ciclops.org/view.php?id=5137
作者 NASA / Jet Propulsion Laboratory / Space Science Institute

许可协议

Public domain 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/zhNASA版权方针页面JPL图片使用方针。)
警告:

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描繪內容

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2012年2月20日 (一) 22:312012年2月20日 (一) 22:31版本的缩略图1,014 × 1,014(273 KB)WolfmanSF

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件: