美国国家航空航天局NASA每日一图-2017年7月21日

Enhanced Color Panorama Above 'Perseverance Valley' on Mars

Toward the right side of this enhanced-color scene is a broad notch in the crest of the western rim of Endeavour Crater on Mars. Wheel tracks in that area were left by NASA's Mars Exploration Rover Opportunity as it observed "Perseverance Valley" from above in the spring of 2017. The valley is a major destination for the rover's extended mission. It descends out of sight on the inner slope of the rim, extending down and eastward from that notch.

Opportunity's panoramic camera (Pancam) took the component images for this view from a position outside the crater during the span of June 7 to June 19, 2017, sols 4753 to 4765 of the rover's work on Mars.

This scene includes features that might have been ancient channels from water, ice or wind moving toward the notch in the rim, which might have been a spillway. Perseverance Valley, just on the other side, was likely carved by action of some fluid, such as water, water-lubricated debris, or wind. The mission is investigating to learn more about that process from evidence in place.

The panorama spans about three-fourths of a full-circle view, from southeastward on the left, through westward in the middle, to northeastward on the right. High points visible on the rim of Endeavour Crater include "Winnemucca" on the left and "Cape Tribulation" on the right. Winnemucca is part of the "Cape Byron" portion of the crater rim. The horizon at far right extends across the floor of Endeavour Crater, which is about 14 miles (22 kilometers) in diameter. Opportunity has been investigating sites on and near the western rim of Endeavour since 2011, following seven years of exploring smaller craters after its 2004 landing. Images showing more of the crater's rim, for context, are at PIA21496, PIA21490 and PIA17758.

This view merges exposures taken through three of the Pancam's color filters, centered on wavelengths of 753 nanometers (near-infrared), 535 nanometers (green) and 432 nanometers (violet). Color is enhanced in this version to make differences in surface materials more easily visible.

The rover team calls this the "Sprained Ankle" panorama because the images were collected during a driving moratorium while engineers diagnosed a temporary steering stall with one front wheel pointed outward more than 30 degrees. The team was able to straighten the wheel to point straight ahead, and then resumed driving.

The location from which this scene was recorded is labeled as "Sol 4752" on a later traverse map. Opportunity subsequently entered the upper end of Perseverance Valley and returned views looking down the valley and back up toward the rim crest from the location it reached on July 7 (Sol 4782).

Feature: From Mars Rover: Panorama Above 'Perseverance Valley'

Image Credit: NASA/JPL-Caltech/Cornell/Arizona State Univ.

Last Updated: July 21, 2017
Editor: Sarah Loff

在火星上“坚持不懈的谷”之上的增强色彩全景

在这个增强色彩场景的右侧是火星上的奋进火山口西缘的顶峰。该地区的轮轨由美国航空航天局的“火星探测机器”留下,因为它在2017年春天从上方观察到“坚忍不决的谷”。山谷是漫游者长期任务的主要目的地。它从边缘的内斜坡下降到视线之外,从该凹口向下和向东延伸。

2017年6月7日至6月19日期间,机会全景相机(Pancam)从火山口外的一个位置拍摄了这个视图的分量图像,解决了漫游者在火星上工作的4753到4765。

这个场景包括可能是从水,冰或风移动到边缘凹槽的古老渠道的特征,这可能是溢洪道。坚持不懈的谷,就在另一边,很可能被一些流体,如水,水润滑的碎片或风等的动作雕刻。特派团正在调查,从证据到位了解更多有关这一进程。

全景四分之三的全景视图,从左边的东南方向,中间的西边,右边的东北方向。Endeavour火山口边缘的高点包括左边的“Winnemucca”和右边的“Cape Tribulation”。Winnemucca是火山口边缘的“拜伦角”部分。远处的地平线穿过直径约14英里(22公里)的奋进火山口地板。自从二零零四年登陆以来七年多的探索小型火山口,自2011年以来,机遇一直在调查Endeav西部及其附近的场地。在PIA21496,PIA21490和PIA17758上显示更多火山口边缘的图像。

该视图合并了三个Pancam滤色镜的曝光,以753纳米(近红外),535纳米(绿色)和432纳米(紫色)的波长为中心。该版本的颜色得到增强,使表面材料的差异更容易看出。

流浪者团队称之为“踝关节踝关节”全景图,因为在驾驶暂停期间收集图像,而工程师诊断出一个前轮向外指向30度以上的临时转向档。该队能够把车轮向前拉直,然后恢复驾驶。

记录该场景的位置在稍后的横越地图上标记为“Sol 4752” 。随后机会进入毅力谷的上端和返回的观点看下来山谷和备份朝从它在7月7日(索尔4782)到达的位置上边缘嵴。

特色:从火星流氓:全景以上“坚持不懈的谷”

图片来源:NASA / JPL-Caltech / Cornell / Arizona State Univ。

最后更新:2017年7月21日
编辑:莎拉·洛夫

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