File:PIA19657-SaturnMoon-Titan-SouthPole-20140407.jpg
原始檔案 (3,108 × 3,108 像素,檔案大小:1.84 MB,MIME 類型:image/jpeg)
說明
摘要
[編輯]描述PIA19657-SaturnMoon-Titan-SouthPole-20140407.jpg |
English: PIA19657: Titan Polar Maps - 2015 - South Pole
http://photojournal.jpl.nasa.gov/catalog/PIA19657 The northern and southern hemispheres of Titan are seen in these polar stereographic maps, assembled in 2015 using the best-available images of the giant Saturnian moon from NASA's Cassini mission. The images were taken by Cassini's imaging cameras using a spectral filter centered at 938 nanometers, allowing researchers to examine variations in albedo (or inherent brightness) across the surface of Titan. These maps utilize imaging data collected through Cassini's flyby on April 7, 2014, known as "T100." Titan's north pole was not well illuminated early in Cassini's mission, because it was winter in the northern hemisphere when the spacecraft arrived at Saturn. Cassini has been better able to observe northern latitudes in more recent years due to seasonal changes in solar illumination. Compared to the previous version of Cassini's north polar map (see PIA11146), this map provides much more detail and fills in a large area of missing data. The imaging data in these maps complement Cassini synthetic aperture radar (SAR) mapping of Titan's north pole (see PIA17655). The uniform gray area in the northern hemisphere indicates a gap in the imaging coverage of Titan's surface, to date. The missing data will be imaged by Cassini during flybys on December 15, 2016 and March 5, 2017. Lakes are also seen in the southern hemisphere map, but they are much less common than in the north polar region. Only a lakes have been confirmed in the south. The dark, footprint-shaped feature at 180 degrees west is Ontario Lacus; a smaller lake named Crveno Lacus can be seen as a very dark spot just above Ontario. The dark-albedo area seen at the top of the southern hemisphere map (at 0 degrees west) is an area called Mezzoramia. Each map is centered on one of the poles, and surface coverage extends southward to 60 degrees latitude. Grid lines indicate latitude in 10-degree increments and longitude in 30-degree increments. The scale in the full-size versions of these maps is 4,600 feet (1,400 meters) per pixel. The mean radius of Titan used for projection of these maps is 1,600 miles (2,575 kilometers). The Cassini mission is a cooperative project of NASA, ESA (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. 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, Colorado. For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini. The Cassini imaging team homepage is at http://ciclops.org. |
日期 | |
來源 | http://photojournal.jpl.nasa.gov/figures/PIA19657_fig4.jpg |
作者 | NASA/JPL-Caltech/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 | 2015年10月9日 (五) 21:56 | 3,108 × 3,108(1.84 MB) | Drbogdan(對話 | 貢獻) | User created page with UploadWizard |
無法覆蓋此檔案。
檔案用途
沒有使用此檔案的頁面。
全域檔案使用狀況
以下其他 wiki 使用了這個檔案:
- af.wikipedia.org 的使用狀況
- an.wikipedia.org 的使用狀況
- ar.wikipedia.org 的使用狀況
- cs.wikipedia.org 的使用狀況
- en.wikipedia.org 的使用狀況
- hy.wikipedia.org 的使用狀況
- ja.wikipedia.org 的使用狀況
- mk.wikipedia.org 的使用狀況
- pl.wikipedia.org 的使用狀況
- zh.wikipedia.org 的使用狀況
詮釋資料
此檔案中包含其他資訊,這些資訊可能是由數位相機或掃描器在建立或數位化過程中所新增的。若檔案自原始狀態已被修改,一些詳細資料可能無法完整反映出已修改的檔案。
方位 | 標準 |
---|---|
水平解析度 | 72.009 dpi |
垂直解析度 | 72.009 dpi |
使用軟體 | Adobe Photoshop CS6 (Macintosh) |
檔案修改日期時間 | 2015年10月1日 (四) 15:55 |
色彩空間 | 顏色未校準 |