| 词条 | Alsat-2A |
| 释义 |
| name = Alsat-2A | image = | image_caption = | mission_type = Earth observation | operator = CNTS | website = | COSPAR_ID = 2010-035D[1] | SATCAT = | mission_duration = | spacecraft_bus = | manufacturer = Airbus Defence and Space[2] | dry_mass = | launch_mass = {{convert|117|kg|lb}} | dimensions = | power = | launch_date = {{start-date|12 July 2010, 03.52:00|timezone=yes}} UTC | launch_rocket = PSLV-C15 | launch_site = Sriharikota | launch_contractor = | disposal_type = | deactivated = | last_contact = | decay_date = | orbit_epoch = | orbit_reference = | orbit_regime = Sun synchronous | orbit_periapsis = {{convert|680.6|km|mi}} | orbit_apoapsis = {{convert|678.6|km|mi}} | orbit_inclination = 98.1º degrees | orbit_period = 98.2 min }}Alsat-2A is an Algerian satellite operated by the Algerian Space Agency for cartography, management of agriculture, forestry, water, mineral and oil resources.[2] The satellite weighs {{convert|117|kg|lb}} and carries an earth optical payload . The satellite was launched on 12 July 2010 by ISRO using the PSLV-C15 rocket.[3] StructureAlsat-2A is the successor of Alsat-1, which was launched on 28 November 2002. The satellite is intended to aid in cartography; gain information for agriculture, forestry and water management; facilitate the search for mineral resources; the planning of land use; and help in disaster response. NAOMI (New Astrosat Observation Modular Instrument) is a telescope installed on the spacecraft, with a {{convert|200|mm|in|abbr=on}} diameter mirror that has a resolution of {{convert|2.5|m|ft|sp=us}} panchromatic and {{convert|10|yd|m|order=flip|sp=us}} in four different spectral regions. The swath width of the telescope is {{convert|17.5|km|mi|abbr=on}}, and the satellite flies over the same spot approximately every three days. The telescope can hold up to 35° outside the orbital plane images. Data transmission occurs in the X- and S-band. The power supply accepts a solar cell of two elements, which provides a maximum of 175 watts of electrical power for the operation of satellite systems and by lithium ion batteries with a total capacity of 15 ampere-hours is supported. The projected lifetime of the satellite is five years. For trajectory correction maneuvers, the satellite uses its hydrazine thrusters, of which it has {{convert|4.5|kg|abbr=on}} propellant for its lifetime. The stabilization is achieved by using star and sun sensors, reaction wheels, gyroscopes and GPS.[4] StartThe launch took place on 12 July 2010 at 05:52 CEST with four other satellites in the PSLV rocket C15 from the rocket launch site Satish Dhawan Space Centre. The main payload Cartosat-2B was the first satellite to deploy, at 1034 seconds, at an altitude of approximately {{convert|637|km|sp=us}} above the earth's surface in a circular sun-synchronous orbit with an inclination of about 98.1 °. Then Alsat-2A was deployed, followed by the three nano or pico Studsat from India, Aïssat-1 from Norway and TIsat-1 from Switzerland.[4] See also{{Portal|Spaceflight}}
References1. ^{{cite web|url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2010-035D|title=Alsat 2A|access-date=2016-10-30|website=NASA Space Science Data Coordinated Archive}} 2. ^1 {{cite web|url=http://www.space-airbusds.com/en/programmes/alsat-2-fbe.html|title=ALSAT-2|website=Airbus Defence and Space|access-date=2016-10-30}} 3. ^{{cite web|url=http://indianexpress.com/article/news-archive/web/this-time-pslv-launch-successful/ |title=This time,PSLV launch successful |publisher=The Indian Express |date=2010-07-13 |accessdate=2016-09-27}} 4. ^1 {{cite web|url=http://www.raumfahrer.net/news/raumfahrt/12072010072708.shtml|title=PSLV-C15 bringt fünf Satelliten ins All|website=Raumfahrer.net|access-date=2016-10-30|language=German}} External links
3 : Spacecraft launched in 2010|Earth observation satellites|Satellites of Algeria |
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