“Lunar Precursor Robotic Program”的意思、由来-开放百科全书

The Lunar Precursor Robotic Program (LPRP) is a completed program of robotic spacecraft missions which NASA has used to prepare for future human spaceflight missions to the Moon by 2010.^[1]^[2] Two LPRP missions, the Lunar Reconnaissance Orbiter (LRO) and the Lunar Crater Observation and Sensing Satellite (LCROSS), were launched in June 2009.^[3] The lift off above Cape Canaveral Air Force Station in Florida was successful on June 18, 2009. The unmanned Atlas V rocket launched the two space probes towards the Moon, where they will provide a 3-D map and search for water in conjunction with the Hubble Space Telescope.^[4]^[5] The launch date, originally planned for October 2008, was shifted to Thursday from Wednesday (June 17) due to a postponement of the Saturday (June 13) launch of the Space Shuttle Endeavour, resulting from a hydrogen fuel leak. This lunar program marked the first United States mission to the Moon in over ten years.^[6] Neil Armstrong's first step on the Moon occurred July 20, 1969, and this launch was just 32 days shy of the 40th anniversary.^[7] The actual journey to the Moon took about four days, at which time the LRO entered a low orbit around the Moon, while the LCROSS mission performed a "swing-by" to enter a much different orbit to set up for a collision with the Moon's surface several months later. Projected lunar impact of the Centaur and LCROSS spacecraft was on October 9, 2009 at 11:30 UT (7:30 a.m. EDT, 4:30 a.m. PDT), ± 30 minutes. The plume from the Centaur impact was predicted to be visible through telescopes with apertures as small as 10 to {{convert|12|in|mm}}.^[5]^[8]

Program history

Initially, the LPRP program was a part of the Science Mission Directorate of NASA (SMD) and was called the Robotic Lunar Exploration Program (RLEP). Management of the RLEP program was assigned to Goddard Space Flight Center (GSFC) in February, 2004. At that time, the Program's goal was to "...initiate a series of robotic missions to the Moon to prepare for and support future human exploration activities."^[9] In 2005, responsibility for RLEP was moved to NASA's Exploration Systems Mission Directorate (ESMD) and management assigned to the Ames Research Center (ARC). In 2006, the program was renamed to the Lunar Precursor Robotic Program and management responsibility reassigned to the Marshall Space Flight Center (MSFC). The US$583 million space mission comes equipped with a $504 million state of the art {{convert|4200|lb|kg}} LRO space probe and a $79 million LCROSS satellite.^[10]

LRO

The Lunar Reconnaissance Orbiter (LRO) is the first mission of the LPRP program. Management of LRO was assigned to Goddard Space Flight Center (GSFC) in 2004. LRO launched on an Atlas V 401 rocket from Cape Canaveral Air Force Station^[11] on June 18, 2009 at 5:32 p.m. EDT (2132 GMT). The planned lift off for 5:12 p.m. EDT (2112 GMT) was slightly delayed by 20 minutes due to thunderstorms.^[10] It will orbit the Moon for one year, gathering high resolution images of the lunar surface that will allow the creation of detailed maps. LRO's goals include finding safe landing sites for human visits to the Moon, identifying lunar resources, and studying the lunar radiation environment. The LRO will provide a 3-D map of the Moon's surface to allow astronauts to return to the Moon by 2020. On board the LRO are seven instruments, the Cosmic Ray Telescope for the Effects of Radiation (CRaTER), Diviner Lunar Radiometer Experiment (DLRE), Lyman-Alpha Mapping Project (LAMP), Lunar Exploration Neutron Detector (LEND), Lunar Orbiter Laser Altimeter (LOLA), Lunar Reconnaissance Orbiter Camera (LROC), and Miniature Radio Frequency radar (Mini-RF).^[7]^[12]^[13]

LCROSS

The Lunar Crater Observation and Sensing Satellite (LCROSS) mission is co-manifested with LRO. It was selected as a secondary payload in 2006, and management of the program was assigned to Ames Research Center (ARC). The mission will explore a permanently shadowed region of a lunar pole by crashing the {{convert|2300|lb|kg}} spent Centaur rocket upper stage of the Atlas V launch vehicle into a dark crater. The composition of the ejecta plume will be observed by a shepherding spacecraft, which will itself crash-land 4 minutes later, creating a second plume. NASA expects the impact velocity will be over 9,000 km/h (5,600 mph). The ejecta plume will be in the order of 350 tons (317 metric tons) and rise {{convert|6|mi|km}} from the surface.^[14]^[15]

LADEE

The Lunar Atmosphere and Dust Environment Explorer (LADEE), launched in on September 7, 2013.^[16] studied the lunar exosphere and dust in the Moon's vicinity.

Future projects

For the proposed International Lunar Network, would land two stations on the lunar surface.^[17] Their objective is to establish a robotic set of geophysical monitoring stations on the surface and eventually, in lunar orbit as well. ^[18]

Data processing

The Lunar Mapping and Modeling project is using the obtained data to develop detailed topographic maps of the lunar surface that support lunar science, exploration, commercial, and educational and public outreach activities.^[19] In addition, solar radiation levels will be mapped and modeled. These integrated data will be used to make decisions about, for example, lunar outpost designs.

See also

References

1. ^{{cite web|url=http://moon.msfc.nasa.gov/ |title=Lunar Precursor Robotic Program |publisher=NASA |accessdate=2008-02-26 |deadurl=yes |archiveurl=https://web.archive.org/web/20080421120647/http://moon.msfc.nasa.gov/ |archivedate=2008-04-21 |df= }}
2. ^Lunar Precursor and Robotic Program. NASA.
3. ^NASA Launch Schedule, retrieved August 8, 2008
4. ^{{cite web | title = Lunar Spacecraft Launch to Moon! | work = Lunar Reconnaissance Orbite | publisher = NASA | date = June 18, 2009 | url = http://lro.gsfc.nasa.gov/ | accessdate =2009-06-18 }}
5. ^¹{{cite web |last = Klotz |first = Irene |title = NASA launches probes to scout the Moon |work = Lunar Reconnaissance Orbiter |agency = Reuters |publisher = ScienceDaily |date = June 18, 2009 |url = http://www.newsdaily.com/stories/tre55h6pj-us-space-moon/ |accessdate = 2009-06-18 |deadurl = yes |archiveurl = https://web.archive.org/web/20090620203620/http://www.newsdaily.com/stories/tre55h6pj-us-space-moon/ |archivedate = June 20, 2009 |df = }}
6. ^{{cite web | title = Lunar Spacecraft Launch to Moon! | work = Lunar Reconnaissance Orbiter NASA's First step back to the Moon | publisher = NASA | date = June 18, 2009 | url = http://www.nasa.gov/mission_pages/LRO/main/index.html | accessdate = 2009-06-18}}
7. ^¹{{cite web |last=Dunn |first=Marcia |title=NASA launches unmanned Moon shot, first in decade |publisher=Associated Press |date=June 18, 2009 |url=https://news.yahoo.com/s/ap/20090618/ap_on_sc/us_sci_moon_rocket |accessdate=2009-06-18 |deadurl=yes |archiveurl=https://web.archive.org/web/20090621223523/http://news.yahoo.com/s/ap/20090618/ap_on_sc/us_sci_moon_rocket |archivedate=2009-06-21 |df= }}
8. ^{{cite web |url=http://lcross.arc.nasa.gov/observation.htm |title=LCROSS Observation Campaign |publisher=NASA |deadurl=yes |archiveurl=https://www.webcitation.org/66BhosrQk?url=http://lcross.arc.nasa.gov/observation.htm |archivedate=2012-03-15 |df= }}
9. ^{{cite web | url = http://lunar.gsfc.nasa.gov/library/vondrak0904.pdf | title = Robotic Lunar Exploration Program 2008 Lunar Reconnaissance Orbiter (LRO) | first = Richard |last = Vondrak | publisher=NASA |date = September 2004}}
10. ^¹{{cite web | last = Harwood | first = William | title = Atlas 5 rocket launches NASA Moon mission | publisher = CNET | date = June 18, 2009 | url = http://news.cnet.com/8301-19514_3-10268241-239.html | accessdate =2009-06-18 }}
11. ^{{cite web | url = http://lunar.gsfc.nasa.gov/launch.html | title = Lunar Reconnaissance Orbiter Launch | publisher = lunar.gsfc.nasa.gov | accessdate = 2008-03-22 | deadurl = yes | archiveurl = https://www.webcitation.org/66CLNG3Y4?url=http://lunar.gsfc.nasa.gov/launch.html | archivedate = 2012-03-16 | df = }}
12. ^{{cite web | last = Klotz | first = Irene | title = NASA launches probes to scout the Moon | publisher = National Post | date = June 18, 2009 | url = https://nationalpost.com/news/story.html?id=1710280 | accessdate = 2009-06-18}} {{Dead link|date=September 2010|bot=H3llBot}}
13. ^{{cite web | last = Yan | title = Backgrounder: Introduction to LRO's instruments | work = Xinhua | publisher = China view | date = June 19, 2009 | url = http://news.xinhuanet.com/english/2009-06/19/content_11564558.htm | accessdate =2009-06-18 }}
14. ^{{cite web | last = Dunn | first = Marcia | title = NASA launches unmanned Moon probe First such mission in a decade will use robotic probes to hunt for hidden ice | work = Associated Press | publisher = MSNBC | date = June 18, 2009 | url = http://www.msnbc.msn.com/id/31424880/ns/technology_and_science-space/ | accessdate =2009-06-18 }}
15. ^{{cite web|url=https://science.nasa.gov/headlines/y2008/11aug_lcross.htm |title=A Flash of Insight: LCROSS Mission Update |date=2008-08-11 |publisher=NASA |deadurl=yes |archiveurl=https://web.archive.org/web/20090105212753/http://science.nasa.gov./headlines/y2008/11aug_lcross.htm |archivedate=2009-01-05 |df= }}
16. ^{{cite web|url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=LADEE|title=Lunar Atmosphere and Dust Environment Explorer (LADEE)|publisher=NASA|work=National Space Science Data Center Master Catalog}}
17. ^{{cite web|url=http://nasascience.nasa.gov/missions/iln |title=International Lunar Network |publisher=NASA SMD |deadurl=yes |archiveurl=https://web.archive.org/web/20080916120534/http://nasascience.nasa.gov/missions/iln |archivedate=2008-09-16 |df= }}
18. ^https://sservi.nasa.gov/articles/international-lunar-network/ International Lunar Network]. NASA.
19. ^[https://www.nasa.gov/mission_pages/lunarquest/mapping/index.html The Lunar Mapping and Modeling Project (LMMP)]. Lunar Quest, NASA.