| 词条 | INSAT-4A |
| 释义 |
| name = INSAT 4A | image = | image_caption = | mission_type = Communications | operator = INSAT | website = INSAT 4A | COSPAR_ID = 2005-049A | SATCAT = 28911 | mission_duration = | spacecraft_bus = I-3K | manufacturer = ISRO | dry_mass = | launch_mass = {{convert|3081|kg|lb}} | power = 5,922 watts | dimensions = 2.8 x 1.7 x 2.0 m | launch_date = {{start-date|22 December 2005, 22:33|timezone=yes}} UTC | launch_rocket = Ariane 5GS | launch_site = Kourou ELA-3 | launch_contractor = | entered_service = | disposal_type = | deactivated = | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Geostationary | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = 74 degrees{{citation needed|date=June 2013}} | orbit_period = 24 hours | orbit_longitude = 83° East ({{coord|0|+83|display=inline,title}}) | orbit_slot = | apsis = gee | trans_band = 12 Ku band 12 C-band | trans_frequency = | trans_bandwidth = 36 megahertz | trans_capacity = | trans_coverage = | trans_TWTA = 140 & 63 watts | trans_EIRP = 51 & 38 dbW | trans_HPBW = }} INSAT-4A is the first one in the INSAT-4 Satellites series, providing services in the Ku and C band frequency bands. At the time of launch, it was the heaviest satellite India had produced and launched. The Ku transponders cover the Indian main land and C-Band transponders cover an extended area. It has a dozen Ku transponders and another dozen of C-band transponders. This spacecraft is placed at 83°E along with INSAT-2E and INSAT-3B, by Ariane launch vehicle (ARIANE5-V169) OverviewINSAT - 4A is a communication satellite intended for providing high quality television, telecommunication, broadcasting services and is the first satellite to be launched in the INSAT-4 series. LaunchINSAT 4A was launched by an Ariane 5, produced by Arianespace, on 22 Dec 2005 at 4.22 am IST from Kourou, French Guiana. It was placed into a Geosynchronous Transfer Orbit (GTO), 30 minutes after lift-off in 3-axis stabilized mode, with a perigee of 859 km and an apogee of 36,055 km. Its co-passenger on board was Meteosat-9 of EUMETSAT. Payload
References[2][3]1. ^{{cite web|title=Tata Sky uses INSAT4A and GSAT-10 transponders|url=https://www.dthhelp.net/tatasky-channel-list|accessdate=6 April 2018}} {{Portal|Spaceflight}}{{INSAT Satellites}}{{Indian spacecraft}}{{Orbital launches in 2005}}2. ^http://space.skyrocket.de/doc_sdat/insat-4a.htm 3. ^http://www.isro.gov.in/Spacecraft/insat-4a 4 : Spacecraft launched in 2005|Communications satellites in geostationary orbit|INSAT satellites|2005 in India |
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