INSAT-3D

INSAT-3D is a meteorological, data relay and satellite aided search and rescue satellite developed by the Indian Space Research Organisation and was launched successfully on 26 July 2013 using an Ariane 5 ECA launch vehicle from French Guiana.^[2][3][4] The satellite has many new technology elements like star sensor, micro stepping Solar Array Drive Assembly (SADA) to reduce the spacecraft disturbances and Bus Management Unit (BMU) for control and telecom and telemetry function. It also incorporates new features of bi-annual rotation and Image and Mirror motion compensations for improved performance of the meteorological payloads.^[5][6]

INSAT-3D

Mission type	Weather
Operator	INSAT
COSPAR ID	2013-038B
SATCAT no.	39216
Website	http://mosdac.gov.in/content/insat-3d
Mission duration	Planned: 7.7 years Elapsed: 11 years, 8 months, 29 days
Spacecraft properties
Bus	I-2K
Manufacturer	ISRO Satellite Centre Space Applications Centre
Launch mass	2,061 kilograms (4,544 lb)
Start of mission
Launch date	25 July 2013, 19:54:07 (2013-07-25UTC19:54:07Z) UTC
Rocket	Ariane 5ECA
Launch site	Kourou ELA-3
Contractor	Arianespace
Orbital parameters
Reference system	Geocentric
Regime	Geostationary
Longitude	82° East
Perigee altitude	35,791 kilometres (22,239 mi)
Apogee altitude	35,795 kilometres (22,242 mi)
Inclination	0.08 degrees
Period	23.93 hours
Epoch	7 November 2013, 23:50:57 UTC[1]

Mission

The mission goal is stated as "to provide an operational, environmental & storm warning system to protect life & property and also to monitor earth’s surface and carryout oceanic observations and also provide data dissemination capabilities."

Payloads

The satellite has four payloads:

• 6 channel multi-spectral Imager
• 19 channel sounder
• Data Relay Transponder (DRT)
• Satellite Aided Search and Rescue (SAS&R)

The sounder has not been operational since September 2020.^[7]

Launch

The satellite was expected to be launched using the GSLV Mk-II. On December 4, 2010, ISRO Chairman revealed that ISRO was considering the use of an Ariane 5 ECA launch vehicle for the launch.^[4] The launch was successfully carried out on 26 July 2013 from French Guiana.^[8] INSAT-3D was launched along with AlphaSat, which is Europe's largest telecommunication satellite.^[9][10]

Retirement

The INSAT 3D satelite's replacement, INSAT 3DS launched on GSLV F14 on 17 February 2024 .it would be retired as its functionality was slowly detriorting and would be used for a different purpose .^[11]