| 词条 | Orbital Test Satellite |
| 释义 |
| name = Orbital Test Satellite 2 | names_list = | image = | image_caption = | image_size = | mission_type = Technology demonstration Communications satellite | operator = ESA | COSPAR_ID = 1978-044A | SATCAT = 10855 | website = | mission_duration = Final: {{time interval|11 May 1978 22:59|2 January 1991|show=ymd|sep=,}} | manufacturer = British Aerospace[1] | dry_mass = | launch_mass = {{convert|865|kg|lb|abbr=on}}[1][2] | BOL_mass = {{convert|445|kg|lb|abbr=on}}[1] | dimensions = {{convert|2.4|xx|2.1|m|ft|abbr=on}}[1] | power = 600 watts[1] | launch_date = {{start-date|11 May 1978, 22:59}} UTC[2] | launch_rocket = Delta 3914[2] | launch_site = Cape Canaveral LC-17A[2] | launch_contractor = | entered_service = | disposal_type = Placed in graveyard orbit | deactivated = {{end-date|2 January 1991}}[2] | orbit_reference = Geocentric | orbit_regime = Geosynchronous | orbit_longitude = | orbit_semimajor = | orbit_eccentricity = | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = | orbit_period = | orbit_epoch = | apsis = gee }} The Orbital Test Satellite programme was an experimental satellite system inherited by the European Space Agency (ESA) in 1975 from its predecessor, the European Space Research Organisation (ESRO). The first of the pair of OTS satellites (OTS-1) was lost at launch in the failure of its US Delta launcher in September 1977. OTS-2 was successfully launched in 1978, again using the Delta rocket and became one of the first geostationary communications satellites to carry six Ku-band transponders and was capable of handling 7,200 telephone circuits. With a mass of approximately 445 kg on station, the OTS 2 bus was hexagonal with overall dimensions of 2.4 m by 2.1 m. Two solar panels with a span of 9.3 m provided 0.6 kW of electrical power. British Aerospace was the prime contractor from the European MESH consortium which developed the OTS vehicle. It completed its primary mission in 1984 after which the spacecraft was involved in a 6-year program of experiments, including the testing of a new attitude control technique taking advantage of solar radiation pressure forces. In January 1991, OTS 2 was moved out of the geostationary ring and into a graveyard orbit. ReferencesThis article contains information that originally came from a U.S. Government website, in the public domain.1. ^1 2 3 4 {{cite web |url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1978-044A |title=OTS 2 |work=National Space Science Data Center |publisher=NASA |accessdate=6 January 2017}} {{telecomm-stub}}2. ^1 2 3 4 {{cite web |url=http://www.astronautix.com/e/ecsots.html |title=ECS/OTS |work=Encyclopedia Astronautica |accessdate=6 January 2017}} 2 : Communications satellites|European Space Agency satellites |
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