| 词条 | PSSC-2 |
| 释义 |
| name = PSSC-2 | image = Picosat.jpg | image_caption = Diagram of PSSC-2 | mission_type = Technology | operator = US Air Force | website = | COSPAR_ID = 2011-031B | SATCAT = | mission_duration = | spacecraft_bus = | manufacturer = Aerospace Corporation | dry_mass = | launch_mass = {{convert|3.7|kg}} | power = | launch_date = {{start-date|8 July 2011, 15:29|timezone=yes}} UTC | launch_rocket = {{OV|104}} STS-135 | launch_site = Kennedy LC-39A | launch_contractor = | deployment_date = | last_contact = | decay_date = | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Low Earth | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = | orbit_period = | apsis = gee }}PSSC-2, or Pico-Satellite Solar Cell Testbed 2,[1] also known as PSSC-Testbed 2, is a miniaturised satellite which was operated by the United States Air Force as part of a technology demonstration programme. It was the last satellite to be deployed from a Space Shuttle.[2] OverviewPSSC-2 was launched aboard {{OV|104|full=nolink}} on its final mission, STS-135. The launch took place from Launch Complex 39A at the Kennedy Space Center, at 15:29 UTC on 8 July 2011.[3] PSSC-2, along with a deployment mechanism, was carried to orbit in the payload bay of the Shuttle, attached to the right wall behind the Orbiter Docking System.[4] It remained attached during Atlantis' visit to the International Space Station, and was originally scheduled to be deployed at 07:11 UTC on 19 July, the day after undocking.[5] With the extension of the STS-135 mission, undocking, and hence deployment, was delayed by one day.[6] PSSC-2 is the second PSSC satellite, following PSSC-1 which was deployed from {{OV|105|full=nolink}} during STS-126 in 2008. It carries two technology demonstration experiments: Miniature Tracking Vehicle (MTV), and the Compact Total Electron Content Sensor (CTECS). MTV will test the satellite's ability to function as a reference body for tracking stations, whilst CTECS will observe the signals from occulting Global Positioning System satellites in order to study the density of the ionosphere. The satellite also carries cameras intended to capture the last images of a Space Shuttle in orbit, shortly after separation.[2] PSSC-2 is a {{convert|3.7|kg|adj=on}} spacecraft which was built by the Aerospace Corporation, and is equipped with three-axis stabilisation, adaptive communications systems, and systems to monitor the energy produced by its solar cells. Four ammonium perchlorate solid rocket motors, each capable of generating {{convert|40|N}} of thrust, will be used for manoeuvring one month after launch; either to raise the satellite's orbit or to deorbit it.[7] References1. ^NASA.gov STS-135 Press Kit, p.97 {{Portal|Spaceflight}}{{Orbital launches in 2011}}2. ^1 {{Citation|date=July 2011|title=STS-135: The Final Mission|type=Press Kit|publisher=NASA|pages= 100–101}} 3. ^{{cite web|url=http://www.planet4589.org/space/jsr/latest.html|title=Issue 644|work=Jonathan's Space Report|first=Jonathan|last=McDowell|accessdate=12 July 2011}} 4. ^{{cite web|url=http://www.nasaspaceflight.com/2011/06/sts-135-final-flights-timeline-takes-shape/|title=STS-135/ULF-7 – The Final Flight’s Timeline Takes Shape|first=Chris|last=Gebhardt|date=17 June 2011|accessdate=12 July 2011|publisher=NASASpaceflight.com}} 5. ^{{cite web|url=http://spaceflightnow.com/shuttle/sts135/fdf/135flightplan.html|title=STS-135 Flightplan|first=William|last=Harwood|publisher=Spaceflight Now|date=8 July 2011|accessdate=12 July 2011}} 6. ^{{cite web|url=http://www.spaceflightnow.com/shuttle/sts135/110711fd4/index2.html|title=Space station resupply pod hoisted from Atlantis' bay|first=William|last=Harwood|publisher=Spaceflight Now|date=11 July 2011|accessdate=12 July 2011}} 7. ^{{cite web|first=Gunter|last=Krebs|work=Gunter's Space Page|title=PSSC-Testbed 2|url=http://space.skyrocket.de/doc_sdat/pssct-2.htm|accessdate=12 July 2011}} 2 : Spacecraft launched in 2011|Spacecraft which reentered in 2011 |
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