跳至內容

英文维基 | 中文维基 | 日文维基 | 草榴社区

File:PIA18399-MarsCuriosityRover-NowOutside3SigmaLandingEllipse-20140627.jpg

頁面內容不支援其他語言。
這個檔案來自維基共享資源
維基百科,自由的百科全書

原始檔案 (2,312 × 1,497 像素,檔案大小:1.97 MB,MIME 類型:image/jpeg


摘要

描述
English: 07.08.2014

Curiosity Mars Rover Reaching Edge of Its Landing Ellipse

NASA's Curiosity Mars rover is stepping on the boundary line. Being called offside is a good thing in this case, but don't tell the World Cup referees!

The blue line added to this June 27, 2014, image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter is the edge of the ellipse that was charted as safe terrain for the rover's August 2012 landing. Curiosity is visible right on the ellipse line in the lower center of the image. This 3-sigma landing ellipse is about 4 miles long and 12 miles wide (7 kilometers by 20 kilometers). Curiosity reached the edge of it for the first time with a drive of about 269 feet (82 meters) earlier that day.

OK, I don't hear any cheering yet. You must be wondering, "What the heck is a 3-sigma landing ellipse?" It is a statistical prediction made prior to landing to determine how far from a targeted center point the rover might land, given uncertainties such as the atmospheric conditions on landing day. The "3-sigma" part means three standard deviations, so the rover was very, very likely (to about the 99.9-percent level) to land somewhere inside this ellipse. Such 3-sigma ellipses get a lot of scrutiny during landing-site selection because we don't want anything dangerous for a landing -- such as boulders of cliffs -- inside the ellipse.

The Mars Science Laboratory mission did not try to land Curiosity right at the base of Mount Sharp, where the most interesting terrains lay, as seen from orbit. To do so would have put unsafe slopes within the landing ellipse. Instead, the rover spent almost exactly one Martian year (687 Earth days) roving and exploring before arriving at the edge of the ellipse.

Maybe the landing-site aficionados are cheering now? Let's try this: Now that Curiosity is outside the safe-to-land ellipse, the landscape it traverses will get even more interesting. The rover can drive around landscape features that would have been dangerous to land on. Both the scenery and the geology should be even more exciting in the next Mars year.

HiRISE is one of six instruments on NASA's Mars Reconnaissance Orbiter. The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter and Mars Science Laboratory projects for NASA's Science Mission Directorate, Washington.
日期
來源 http://mars.jpl.nasa.gov/msl/images/Curiosity-msl-landing-ellipse-edge-HiRise-pia18399-full.jpg
作者 NASA/JPL-Caltech/Univ. of Arizona
本圖像或影音收錄於美國國家航空暨太空總署 (NASA)噴射推進實驗室(Jet Propulsion Laboratory),其照片編號為: PIA18399

此標籤不表示文件的著作權狀態。任何文件在附有此標籤的同時還需要一個有效的著作權標籤請參閱許可協議說明頁面以了解更多資訊。
其他語言:

授權條款

Public domain 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/zhNASA版權政策JPL圖像使用政策
警告:

說明

添加單行說明來描述出檔案所代表的內容

在此檔案描寫的項目

描繪內容

著作權狀態 繁體中文 (已轉換拼寫)

斷定方法:​美國聯邦政府的作品 繁體中文 (已轉換拼寫)

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2014年7月11日 (五) 17:36於 2014年7月11日 (五) 17:36 版本的縮圖2,312 × 1,497(1.97 MB)DrbogdanUser created page with UploadWizard

下列頁面有用到此檔案:

全域檔案使用狀況

以下其他 wiki 使用了這個檔案: