| 词条 | USA-225 |
| 释义 |
| name = USA-225 | image = NROL66.png | image_caption = NROL-66, carrying advanced dosimeters, during ground processing | insignia = | mission_type = Technology | operator = NRO | website = | COSPAR_ID = 2011-006A | SATCAT = 37364 | mission_duration = | spacecraft_bus = | manufacturer = | dry_mass = | launch_mass = {{convert|350|kg|lb}}[1] | power = | launch_date = {{start-date|6 February 2011, 12:26|timezone=yes}} UTC[2] | launch_rocket = Minotaur I SLV-10 | launch_site = Vandenberg SLC-8 | launch_contractor = Orbital Sciences | disposal_type = | deactivated = | last_contact = | decay_date = | orbit_epoch = 6 February 2011[3] | orbit_reference = Geocentric | orbit_regime = Low Earth | orbit_periapsis = {{convert|1202|km|mi|sp=us}} | orbit_apoapsis = {{convert|1230|km|mi|sp=us}} | orbit_inclination = 90 degrees | orbit_period = 109.76 minutes | apsis = gee }}USA-225, also known as the Rapid Pathfinder Prototype (RPP) and NRO Launch 66 (NROL-66), is an American satellite which was launched in 2011. The satellite is being used to perform technology demonstration and development experiments, including advanced dosimeters to characterize the space environment from a 1,200 kilometer low Earth orbit.[4] It is operated by the United States National Reconnaissance Office.[5] Rapid Pathfinder was developed for less than US$ 20 million over a period of less than two years. Its dimensions are 0.5 m times 0.5 m times 0.5 m, and its mass including payload is 235 kg.[4] A Minotaur I carrier rocket was used to launch USA-225, flying from Space Launch Complex 8 of the Vandenberg Air Force Base. The launch of was originally scheduled for March 2011; however, it was subsequently moved forwards to 5 February.[6] During the attempt to launch on 5 February 2011, a transmitter malfunctioned, and the launch attempt was scrubbed. Another attempt was scheduled for the next day. At 12:26 on 6 February 2011, the Minotaur lifted off, carrying USA-225 into orbit.[7] The launch was conducted by Orbital Sciences Corporation. For launch, the RPP satellite was given the designation NRO Launch 66, or NROL-66. Upon reaching orbit it was named USA-225 in accordance with the usual naming system for American military spacecraft. The satellite received the International Designator 2011-006A, and the Satellite Catalog Number 37364.[8] See also{{Portal|Spaceflight}}
References1. ^{{cite web|url=http://www.ucsusa.org/assets/documents/nwgs/UCS_Satellite_Database_9-1-13.txt|title=UCS Satellite Database|publisher=Union of Concerned Scientists|accessdate=30 November 2013}} {{NRO Launches}}{{Orbital launches in 2011}}{{US-spacecraft-stub}}2. ^{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|work=Jonathan's Space Page|accessdate=30 November 2013}} 3. ^{{cite web|url=http://planet4589.org/space/log/satcat.txt|title=Satellite Catalog|first=Jonathan|last=McDowell|work=Jonathan's Space Page|accessdate=30 November 2013}} 4. ^1 {{cite web|last=Carlson|first=Bruce|title=NRO’s Historical, Current, and Potential Use of Small Satellites|url=http://www.nro.gov/news/speeches/2011/2011-01.pdf|publisher=NRO|accessdate=26 August 2011|date=8 August 2011}} 5. ^{{cite web|last=Krebs|first=Gunter|title=RPP|url=http://space.skyrocket.de/doc_sdat/rpp.htm|work=Gunter's Space Page|accessdate=9 February 2011}} 6. ^{{cite web|title=Launch Log|url=http://www.spaceflightnow.com/tracking/launchlog.html|work=Tracking Station|publisher=Spaceflight Now|accessdate=9 February 2011}} 7. ^{{cite web|last=Clark|first=Stephen|title=Classified satellite climbs to space on Minotaur rocket|url=http://www.spaceflightnow.com/minotaur/nrol66/index.html|publisher=Spaceflight Now|accessdate=9 February 2011|date=6 February 2011}} 8. ^{{cite web|title=USA 225 Satellite details 2011-006A NORAD 37364|url=http://www.n2yo.com/satellite/?s=37364|publisher=N2YO|accessdate=9 February 2011}} 3 : Spacecraft launched in 2011|Spacecraft launched by Minotaur rockets|USA satellites |
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