File:PIA11101 Anthe ring arc.jpg
PIA11101_Anthe_ring_arc.jpg (566 × 425 像素,檔案大小:35 KB,MIME 類型:image/jpeg)
說明
摘要
[編輯]描述PIA11101 Anthe ring arc.jpg |
English: Cassini images reveal the existence of a faint arc of material orbiting with Saturn's small moon Anthe.
The moon is moving downward and to the right in this perspective. In this image, most of the visible material in the arc lies ahead of Anthe (2 kilometers, or 1 mile across) in its orbit. However, over time the moon drifts slowly back and forth with respect to the arc. The arc extends over about 20 degrees in longitude (about 5.5 percent of Anthe's orbit) and appears to be associated with a gravitational resonance caused by the moon Mimas. Micrometeoroid impacts on Anthe are the likely source of the arc material. The orbit of Anthe lies between the larger moons Mimas and Enceladus. Anthe shares this region with two other small moons, Pallene (4 kilometers, or 3 miles across) and Methone (3 kilometers, or 2 miles across). Methone also possesses an arc (see PIA11102), while Pallene is known to orbit within a faint, complete ring of its own (see PIA08328). Cassini imaging scientists believe the process that maintains the Anthe and Methone arcs is similar to that which maintains the arc in the G ring (see PIA08327). The general brightness of the image (along with the faint horizontal banding pattern) results from the long exposure time of 32 seconds required to capture the extremely faint ring arc and the processing needed to enhance its visibility (which also enhances the digital background noise in the image). The image was digitally processed to remove most of the background noise. The long exposure also produced star trails in the background. This view looks toward the un-illuminated side of the rings from about 3 degrees above the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on July 3, 2008. The view was obtained at a distance of approximately 1.2 million kilometers (739,000 miles) from Anthe and at a sun-Anthe-spacecraft, or phase, angle of 12 degrees. Image scale is 7 kilometers (4 miles) per pixel. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. 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 and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo. The original NASA image has been resized and cropped. |
||
日期 | |||
來源 |
http://photojournal.jpl.nasa.gov/catalog/PIA11101
|
||
作者 | NASA / JPL / Space Science Institute |
授權條款
[編輯]Public domainPublic domainfalsefalse |
本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
警告:
|
檔案歷史
點選日期/時間以檢視該時間的檔案版本。
日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
---|---|---|---|---|---|
目前 | 2019年8月8日 (四) 18:12 | 566 × 425(35 KB) | BevinKacon(對話 | 貢獻) | File:Anthe ring arc PIA11101.jpg cropped 2 % horizontally, 31 % vertically using CropTool with precise mode. use actual size instead of upscale | |
2008年9月14日 (日) 23:11 | 800 × 600(81 KB) | WolfmanSF(對話 | 貢獻) | {{Information |Description={{en|1=Cassini images reveal the existence of a faint arc of material orbiting with Saturn's small moon Anthe. The moon is moving downward and to the right in this perspective. In this image, most of the visible material in the |
無法覆蓋此檔案。
檔案用途
下列3個頁面有用到此檔案:
全域檔案使用狀況
以下其他 wiki 使用了這個檔案:
- bo.wikipedia.org 的使用狀況
- ca.wikipedia.org 的使用狀況
- de.wikipedia.org 的使用狀況
- el.wikipedia.org 的使用狀況
- en.wikipedia.org 的使用狀況
- ja.wikipedia.org 的使用狀況
- ko.wikipedia.org 的使用狀況
- mk.wikipedia.org 的使用狀況
- pt.wikipedia.org 的使用狀況
- zh.wikipedia.org 的使用狀況